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JP2013234351A - Cleaning agent and cleaning method for inner face of copper tube - Google Patents

Cleaning agent and cleaning method for inner face of copper tube Download PDF

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Publication number
JP2013234351A
JP2013234351A JP2012106877A JP2012106877A JP2013234351A JP 2013234351 A JP2013234351 A JP 2013234351A JP 2012106877 A JP2012106877 A JP 2012106877A JP 2012106877 A JP2012106877 A JP 2012106877A JP 2013234351 A JP2013234351 A JP 2013234351A
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copper tube
acid
copper
cleaning
agent
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Yutaka Yamada
山田  豊
Tokio Wada
登喜夫 和田
Yukio Inoue
行雄 井上
Kazuyoshi Ichihara
和好 市原
Yasuaki Mitamura
安晃 三田村
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Showa Co Ltd
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Showa Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a cleaning agent and cleaning method for the inner face of a copper tube, capable of effectively removing a carbon coating formed on the inner face of a copper tube while suppressing damages on the inner face of a copper tube to maintain durability.SOLUTION: A cleaning agent for the inner face of a copper tube is used for removing a carbon coating formed on the inner face of a copper tube, and includes an aqueous solution of organic acid, sulfamic acid or a chelating agent and an oxidizing agent, as active ingredients to remove the carbon coating. The organic acid is preferably citric acid, the chelating agent is preferably an ethylenediaminetetraacetic acid salt such as ethylenediaminetetraacetic acid sodium. The oxidizing agent is preferably hydrogen peroxide, or percarbonate such as sodium percarbonate.

Description

本発明は、例えば冷凍機、空調回路、給湯回路等に配管される銅管の内面に形成されている炭素質皮膜(カーボン皮膜)を除去し、耐食性を高めるための銅管内面の洗浄剤及び洗浄方法に関する。   The present invention removes a carbonaceous film (carbon film) formed on the inner surface of a copper pipe piped in, for example, a refrigerator, an air conditioning circuit, a hot water supply circuit, etc. The present invention relates to a cleaning method.

銅管(銅合金管)を製造する際には抽伸加工時に潤滑油が使用されるが、管内に残存した潤滑油が次工程の焼鈍処理時における加熱によって銅管内面にカーボン皮膜となって残留する。このようなカーボン皮膜の多い銅管を空調回路や給湯回路の水系回路に使用した場合、腐食が発生しやすくなる。この腐食の多くは孔食であることから、回路を流れる流体の漏洩を招くおそれがある。   When manufacturing copper pipes (copper alloy pipes), lubricating oil is used during the drawing process, but the lubricating oil remaining in the pipe remains as a carbon film on the inner surface of the copper pipe due to heating during the annealing process of the next step. To do. When such a copper tube with a large carbon film is used in an air-conditioning circuit or an aqueous circuit of a hot water supply circuit, corrosion tends to occur. Since most of this corrosion is pitting corrosion, there is a risk of leakage of fluid flowing in the circuit.

カーボン皮膜は銅管内面に強固に付着し、無機質であることから、有機系溶剤や界面活性剤では除去することができない。また、銅は電位が水素より貴であることから、塩酸や希硫酸では溶解できず、硝酸や濃硫酸等の酸で溶解処理しなければならないが、これらの酸は強酸であるため銅管内面の損傷が大きくなるとともに、銅の溶解時に窒素酸化物や亜硫酸ガスが発生するおそれがある。   Since the carbon film adheres firmly to the inner surface of the copper tube and is inorganic, it cannot be removed with an organic solvent or a surfactant. In addition, since copper has a higher potential than hydrogen, it cannot be dissolved with hydrochloric acid or dilute sulfuric acid, and must be dissolved with an acid such as nitric acid or concentrated sulfuric acid. In addition to the increase in damage, nitrogen oxides and sulfurous acid gas may be generated when copper is dissolved.

このようなカーボン皮膜を除去するために、例えば特許文献1には酸化剤として第二鉄塩又はペルオキソ二硫酸塩を含有する洗浄液が開示されている。第二鉄塩としては硫酸第二鉄等が用いられ、ペルオキソ二硫酸塩としてはペルオキソ二硫酸ナトリウム等が用いられる。この洗浄液には、硫酸を添加した酸性溶液に上記酸化剤を添加することが望ましいとされ、その実施例1においては硫酸と硫酸第二鉄との混合物及び硫酸とペルオキソ二硫酸ナトリウムとの混合物が使用されている。   In order to remove such a carbon film, for example, Patent Document 1 discloses a cleaning liquid containing ferric salt or peroxodisulfate as an oxidizing agent. Ferric sulfate or the like is used as the ferric salt, and sodium peroxodisulfate or the like is used as the peroxodisulfate. In this cleaning liquid, it is desirable to add the oxidizing agent to an acidic solution to which sulfuric acid has been added. In Example 1, a mixture of sulfuric acid and ferric sulfate and a mixture of sulfuric acid and sodium peroxodisulfate are included. It is used.

特開2007−119803号公報Japanese Patent Laid-Open No. 2007-119833

前記特許文献1に記載されている従来構成の洗浄液では、使用時にガスの発生は見られないが、硫酸を用いるため作業時に注意が必要であり、また銅管内面の損傷(減肉)が大きく、銅管の耐久性が低下するという問題があった。   In the conventional cleaning solution described in Patent Document 1, no gas is generated during use, but since sulfuric acid is used, caution is required during operation, and damage (thinning) of the inner surface of the copper tube is large. There was a problem that the durability of the copper tube was lowered.

本発明は、このような従来技術に存在する問題点に着目してなされたものであり、その目的とするところは、銅管内面の損傷を抑えて耐久性を維持しつつ、銅管内面に形成されたカーボン皮膜を有効に除去することができる銅管内面の洗浄剤及び洗浄方法を提供することにある。   The present invention has been made paying attention to such problems existing in the prior art, and the object of the present invention is to prevent damage to the inner surface of the copper tube and maintain durability while maintaining the inner surface of the copper tube. It is an object of the present invention to provide a cleaning agent and a cleaning method for an inner surface of a copper tube that can effectively remove a formed carbon film.

上記の目的を達成するために、請求項1に記載の発明の銅管内面の洗浄剤は、銅管内面に形成された炭素質皮膜を除去するための銅管内面の洗浄剤であって、有機酸又はスルファミン酸の水溶液と、酸化剤とを、炭素質皮膜を除去する有効成分として含有することを特徴とする。   In order to achieve the above object, the cleaning agent for an inner surface of a copper tube according to claim 1 is a cleaning agent for the inner surface of a copper tube for removing a carbonaceous film formed on the inner surface of the copper tube, It contains an aqueous solution of an organic acid or sulfamic acid and an oxidizing agent as active ingredients for removing the carbonaceous film.

請求項2に記載の発明の銅管内面の洗浄剤は、請求項1に係る発明において、前記有機酸はクエン酸であることを特徴とする。
請求項3に記載の発明の銅管内面の洗浄剤は、銅管内面に形成された炭素質皮膜を除去するための銅管内面の洗浄剤であって、キレート剤の水溶液と、酸化剤とを、炭素質皮膜を除去する有効成分として含有することを特徴とする。
A cleaning agent for an inner surface of a copper tube according to a second aspect of the present invention is characterized in that, in the first aspect of the invention, the organic acid is citric acid.
A cleaning agent for an inner surface of a copper tube according to a third aspect of the invention is a cleaning agent for the inner surface of a copper tube for removing a carbonaceous film formed on the inner surface of the copper tube, and includes an aqueous solution of a chelating agent, an oxidizing agent, Is contained as an active ingredient for removing the carbonaceous film.

請求項4に記載の発明の銅管内面の洗浄剤は、請求項3に係る発明において、前記キレート剤はエチレンジアミン四酢酸塩であることを特徴とする。
請求項5に記載の発明の銅管内面の洗浄剤は、請求項1から請求項4のいずれか一項に係る発明において、前記酸化剤は過酸化水素又は過炭酸塩であることを特徴とする。
A cleaning agent for an inner surface of a copper tube according to a fourth aspect of the present invention is the invention according to the third aspect, wherein the chelating agent is ethylenediaminetetraacetate.
A cleaning agent for an inner surface of a copper pipe according to a fifth aspect of the present invention is the invention according to any one of the first to fourth aspects, wherein the oxidizing agent is hydrogen peroxide or a percarbonate. To do.

請求項6に記載の発明の銅管内面の洗浄方法は、請求項1から請求項5のいずれか一項に記載の銅管内面の洗浄剤を銅管内に通液して銅管内面の炭素質皮膜を除去することを特徴とする。   According to a sixth aspect of the present invention, there is provided a method for cleaning an inner surface of a copper tube, wherein the cleaning agent for the inner surface of the copper tube according to any one of the first to fifth aspects is passed through the copper tube. It is characterized by removing the carbonaceous film.

本発明によれば、次のような効果を発揮することができる。
本発明の銅管内面の洗浄剤では、炭素質皮膜を除去する有効成分として、有機酸又はスルファミン酸の水溶液と、酸化剤とが含まれている。このため、洗浄剤を銅管内に通液させることにより、酸化剤によって銅管内面の銅が酸化されて酸化銅が生成し、その酸化銅が有機酸又はスルファミン酸に溶解されて除去されるが、その際酸化銅とともに銅管内面に形成されているカーボン皮膜が剥離される。このとき、有機酸又はスルファミン酸は、硫酸、硝酸等の強酸に比べて弱い酸であることから、銅管内面の損傷が抑えられる。
According to the present invention, the following effects can be exhibited.
In the cleaning agent for the inner surface of the copper pipe of the present invention, an aqueous solution of an organic acid or sulfamic acid and an oxidizing agent are included as effective components for removing the carbonaceous film. Therefore, by passing the cleaning agent through the copper pipe, the copper on the inner surface of the copper pipe is oxidized by the oxidizing agent to form copper oxide, and the copper oxide is dissolved in the organic acid or sulfamic acid and removed. However, the carbon film formed on the inner surface of the copper tube together with the copper oxide is peeled off. At this time, since the organic acid or sulfamic acid is a weak acid as compared with a strong acid such as sulfuric acid and nitric acid, damage to the inner surface of the copper tube can be suppressed.

従って、本発明の銅管内面の洗浄剤によれば、銅管内面の損傷を抑えて耐久性を維持しつつ、銅管内面に形成されたカーボン皮膜を有効に除去することができるという効果を奏する。   Therefore, according to the cleaning agent for the inner surface of the copper pipe of the present invention, the carbon film formed on the inner surface of the copper pipe can be effectively removed while suppressing the damage to the inner surface of the copper pipe and maintaining the durability. Play.

以下、本発明を具体化した実施形態について詳細に説明する。
本実施形態における銅管内面の洗浄剤は、銅管内面に形成された無機質の炭素質皮膜(カーボン皮膜)を除去するためのものであって、有機酸又はスルファミン酸の水溶液と、酸化剤とを、カーボン皮膜を除去するための有効成分として含有する。なお、銅管は、銅のみ(純銅)で形成された管のほかに、銅合金(黄銅、青銅等)で形成された管を含む概念である。この洗浄剤としては、有機酸又はスルファミン酸の水溶液に代えて、キレート剤の水溶液を使用することができる。
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described in detail.
The cleaning agent for the inner surface of the copper tube in the present embodiment is for removing the inorganic carbonaceous film (carbon film) formed on the inner surface of the copper tube, and includes an aqueous solution of an organic acid or sulfamic acid, an oxidizing agent, Is contained as an active ingredient for removing the carbon film. The copper tube is a concept including a tube formed of a copper alloy (brass, bronze, etc.) in addition to a tube formed of only copper (pure copper). As this cleaning agent, an aqueous solution of a chelating agent can be used instead of an aqueous solution of an organic acid or sulfamic acid.

当該洗浄剤において、前記酸化剤は銅管内面の銅を酸化して酸化銅、主に酸化第一銅(CuO)を生成し、有機酸、スルファミン酸又はキレート剤がその酸化銅を溶解又はキレート化することによって取り除き、その際同時にカーボン皮膜を銅管内面から取り除くことができるものと推測される。 In the cleaning agent, the oxidizing agent oxidizes copper on the inner surface of the copper tube to produce copper oxide, mainly cuprous oxide (Cu 2 O), and the organic acid, sulfamic acid or chelating agent dissolves the copper oxide. Alternatively, it is presumed that the carbon film can be removed from the inner surface of the copper tube at the same time by removing it by chelation.

前記有機酸としては、クエン酸、酒石酸、リンゴ酸、フィチン酸、蟻酸、酢酸、或いはアクリル酸、マレイン酸及びそれらの重合体等が用いられる。該有機酸は、一種又は二種以上を適宜選択して使用することができる。これらの有機酸のうち、銅管内面の損傷を抑制できるとともに、食品添加物でもあるクエン酸が好ましい。前記スルファミン酸は有機酸よりも酸度が高いことから、カーボン皮膜の除去効果が高い点で望ましい。なお、クエン酸、リンゴ酸、フィチン酸等はキレート作用を示し、キレート剤としても機能する。   Examples of the organic acid include citric acid, tartaric acid, malic acid, phytic acid, formic acid, acetic acid, acrylic acid, maleic acid, and polymers thereof. The organic acid can be used by appropriately selecting one kind or two or more kinds. Among these organic acids, citric acid which can suppress damage on the inner surface of the copper tube and is also a food additive is preferable. Since the sulfamic acid has a higher acidity than an organic acid, it is desirable in that it has a high carbon film removal effect. Citric acid, malic acid, phytic acid, and the like exhibit a chelating action and also function as a chelating agent.

前記キレート剤としては、エチレンジアミン四酢酸(EDTA)、ジエチレントリアミン五酢酸(DTPA)、又はヒドロキシエチリデンジホスホン酸(HEDP)、ジエチレントリアミンペンタメチレンホスホン酸(DTPMP)、アミノトリメチルホスホン酸(AMPS)、ホスホノブタントリカルボン酸(PBTC)等のホスホン酸又はそれらの塩、酒石酸塩、リンゴ酸塩、クエン酸塩、フィチン酸塩等が用いられる。塩としては、ナトリウム塩、カリウム塩等が挙げられる。このキレート剤は、一種又は二種以上を選択して使用することができる。上記EDTAの塩は、二ナトリウム塩、四ナトリウム塩等があり、それらを適宜組合せて使用することができる。   Examples of the chelating agent include ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA), hydroxyethylidene diphosphonic acid (HEDP), diethylenetriaminepentamethylenephosphonic acid (DTPMP), aminotrimethylphosphonic acid (AMPS), and phosphonobutane. Phosphonic acid such as tricarboxylic acid (PBTC) or a salt thereof, tartrate, malate, citrate, phytate and the like are used. Examples of the salt include sodium salt and potassium salt. One or two or more chelating agents can be selected and used. Examples of the EDTA salt include a disodium salt and a tetrasodium salt, which can be used in appropriate combination.

これらのキレート剤は塩単独、酸と塩との混合物などとして使用することができ、洗浄剤のpHを酸性から中性、さらにはアルカリ性まで調節することができる。従って、キレート剤を適宜選択することにより、洗浄剤を広いpH域で使用することが可能である。   These chelating agents can be used as a salt alone, a mixture of an acid and a salt, etc., and the pH of the cleaning agent can be adjusted from acidic to neutral to alkaline. Therefore, the cleaning agent can be used in a wide pH range by appropriately selecting the chelating agent.

洗浄剤中における有機酸、スルファミン酸又はキレート剤の濃度としては、0.1〜10質量%が好ましく、0.5〜5質量%がさらに好ましい。この濃度が0.1質量%を下回る場合には、酸又はキレート剤の濃度が低くなり過ぎて、酸化銅の溶解やキレート化が不足してカーボン皮膜の除去効果が低下したり、洗浄時間が長くなったりする。その一方、濃度が10質量%を上回る場合には、酸又はキレート剤の濃度が高くなり過ぎて銅管の損傷が大きくなるおそれがある。   The concentration of the organic acid, sulfamic acid or chelating agent in the cleaning agent is preferably 0.1 to 10% by mass, and more preferably 0.5 to 5% by mass. When this concentration is less than 0.1% by mass, the concentration of the acid or chelating agent becomes too low, so that the dissolution effect or chelation of copper oxide is insufficient and the effect of removing the carbon film is reduced, or the cleaning time is reduced. It will be long. On the other hand, if the concentration exceeds 10% by mass, the concentration of the acid or chelating agent becomes too high, and the copper tube may be damaged.

前記酸化剤は過酸化水素(H)又は過炭酸塩であることが好ましい。この過炭酸塩としては、過炭酸ナトリウム(2NaCO・3H)等が挙げられる。過酸化水素と過炭酸塩はいずれか一方又は双方を使用することができる。酸化剤のうち、過酸化水素、或いは過炭酸ナトリウム等の過酸化水素付加化合物は、使用時に発生するガスが酸素ガスであるとともに、分解後には水又は炭酸塩になり、取扱性が良いことから好ましい。 The oxidizing agent is preferably hydrogen peroxide (H 2 O 2 ) or percarbonate. Examples of the percarbonate include sodium percarbonate (2Na 2 CO 3 .3H 2 O 2 ). Either one or both of hydrogen peroxide and percarbonate can be used. Among the oxidizing agents, hydrogen peroxide or hydrogen peroxide addition compounds such as sodium percarbonate are oxygen gas as the gas generated during use and become water or carbonate after decomposition, which is easy to handle. preferable.

洗浄剤中における酸化剤の濃度は、好ましくは0.1〜10質量%、さらに好ましくは0.5〜3質量%である。酸化剤の濃度が0.1質量%より低い場合には、銅管内面の銅を酸化する作用が弱くなり、酸又はキレート剤の作用を発揮させることができず、好ましくない。その一方、酸化剤の濃度が10質量%より高い場合には、酸化剤の作用が強く働いて、銅管内面の侵食が大きくなって好ましくない。   The concentration of the oxidizing agent in the cleaning agent is preferably 0.1 to 10% by mass, more preferably 0.5 to 3% by mass. When the concentration of the oxidant is lower than 0.1% by mass, the action of oxidizing copper on the inner surface of the copper tube becomes weak, and the action of the acid or chelating agent cannot be exhibited, which is not preferable. On the other hand, when the concentration of the oxidant is higher than 10% by mass, the action of the oxidant works strongly, and the erosion of the inner surface of the copper tube is increased, which is not preferable.

前記有機酸、スルファミン酸又はキレート剤と、酸化剤との配合比は、有機酸、スルファミン酸又はキレート剤が酸化剤より過剰となるように設定することが望ましい。配合比をこのように設定することにより、酸化剤によって銅管内面に形成された酸化銅を十分に溶解又は捕捉できると同時に、カーボン皮膜を有効に除去することができる。   The mixing ratio of the organic acid, sulfamic acid or chelating agent and the oxidizing agent is preferably set so that the organic acid, sulfamic acid or chelating agent is in excess of the oxidizing agent. By setting the blending ratio in this way, the copper oxide formed on the inner surface of the copper tube by the oxidizing agent can be sufficiently dissolved or captured, and at the same time, the carbon film can be effectively removed.

続いて、以上のように構成された洗浄剤を用いた銅管内面の洗浄方法について説明する。
銅管内面に形成されたカーボン皮膜を除去する場合には、まず洗浄剤を構成する有機酸、スルファミン酸又はキレート剤の水溶液、及び酸化剤の種類、濃度等を決定し、それらの成分を混合して洗浄剤を調製する。得られた洗浄剤を銅管内に所定流量で所定時間通液することにより、銅管内面のカーボン皮膜を除去することができる。この洗浄処理は、前記洗浄剤の働きにより、例えば3時間以内(半日以内)で行うことができる。
Next, a method for cleaning the inner surface of the copper tube using the cleaning agent configured as described above will be described.
When removing the carbon film formed on the inner surface of a copper tube, first determine the type, concentration, etc. of the organic acid, sulfamic acid or chelating agent aqueous solution that constitutes the cleaning agent, and mix these components. To prepare a cleaning agent. By passing the obtained cleaning agent through the copper tube at a predetermined flow rate for a predetermined time, the carbon film on the inner surface of the copper tube can be removed. This cleaning treatment can be performed, for example, within 3 hours (within half a day) by the action of the cleaning agent.

次に、本実施形態における銅管内面の洗浄剤について作用を説明する。
さて、銅管内面の洗浄剤は、カーボン皮膜を除去するための有効成分として、有機酸、スルファミン酸又はキレート剤の水溶液と、酸化剤とを含有している。この洗浄剤を銅管内に通液させることにより、酸化剤が銅管内面に接触して銅を酸化し、酸化銅主として酸化第一銅を生成する。このため、有機酸又はスルファミン酸が生成した酸化第一銅を溶解し、キレート剤が酸化第一銅をキレート化してキレート化合物を形成する。従って、銅管内表面のカーボン皮膜が形成されている部分における銅層が取り除かれ、取り除かれた銅層とともにカーボン皮膜が剥離される。
Next, an effect | action is demonstrated about the cleaning agent of the copper pipe inner surface in this embodiment.
Now, the cleaning agent for the inner surface of the copper tube contains an aqueous solution of an organic acid, sulfamic acid or chelating agent and an oxidizing agent as an effective component for removing the carbon film. By passing this cleaning agent through the copper tube, the oxidant comes into contact with the inner surface of the copper tube to oxidize copper and produce cuprous oxide, mainly cuprous oxide. For this reason, the cuprous oxide which the organic acid or sulfamic acid produced | generated is melt | dissolved, and a chelating agent chelates cuprous oxide and forms a chelate compound. Therefore, the copper layer in the portion where the carbon film on the inner surface of the copper tube is formed is removed, and the carbon film is peeled off together with the removed copper layer.

この過程において、銅管内面のカーボン皮膜近傍には酸化剤と酸又はキレート剤とが存在していることから、酸化剤による酸化銅の生成と、酸又はキレート剤による酸化銅の溶解又はキレート化による捕捉が繰り返して行われる。その結果、銅管内面のカーボン皮膜が連続的に銅管内面から剥される。   In this process, since an oxidizing agent and an acid or chelating agent are present in the vicinity of the carbon film on the inner surface of the copper tube, the formation of copper oxide by the oxidizing agent and the dissolution or chelation of copper oxide by the acid or chelating agent The capture by is repeated. As a result, the carbon film on the inner surface of the copper tube is continuously peeled from the inner surface of the copper tube.

一方、有機酸又はスルファミン酸は、硫酸、硝酸等の強酸に比べて弱い酸であるとともに、キレート剤は強酸の強い溶解力に比較して弱いキレート力を発現する。従って、洗浄剤による銅管内面の侵食が極力抑えられ、その結果銅管の減肉量が低減される。   On the other hand, an organic acid or sulfamic acid is a weak acid compared to a strong acid such as sulfuric acid or nitric acid, and a chelating agent develops a weak chelating power compared to a strong dissolving power of a strong acid. Therefore, erosion of the inner surface of the copper tube by the cleaning agent is suppressed as much as possible, and as a result, the amount of thinning of the copper tube is reduced.

以上説明した実施形態によって得られる効果を以下にまとめて記載する。
(1)本実施形態の銅管内面の洗浄剤では、カーボン皮膜を除去する有効成分として、有機酸、スルファミン酸又はキレート剤の水溶液と、酸化剤とが含まれている。このため、酸化剤により銅管内面に酸化銅が生成し、その酸化銅が有機酸又はスルファミン酸に溶解されるか、又はキレート剤によりキレート化されて除去されるが、その際酸化銅とともに銅管内面のカーボン皮膜が剥離される。この場合、有機酸又はスルファミン酸は弱酸であり、キレート剤は弱いキレート力を有していることから、銅管内面の損傷が抑えられる。
The effects obtained by the embodiment described above will be collectively described below.
(1) In the cleaning agent for the inner surface of the copper tube of the present embodiment, an aqueous solution of an organic acid, sulfamic acid or chelating agent and an oxidizing agent are included as effective components for removing the carbon film. For this reason, copper oxide is generated on the inner surface of the copper tube by the oxidizing agent, and the copper oxide is dissolved in an organic acid or sulfamic acid or chelated by a chelating agent and removed. The carbon film on the inner surface of the tube is peeled off. In this case, since the organic acid or sulfamic acid is a weak acid and the chelating agent has a weak chelating power, damage to the inner surface of the copper tube can be suppressed.

従って、本実施形態の銅管内面の洗浄剤によれば、銅管内面の損傷を抑えて耐食性や耐久性を維持しつつ、銅管内面に形成されたカーボン皮膜を有効に除去することができるという効果を発揮する。このため、冷凍機、空調回路、給湯回路等に配管されている銅管を前記洗浄剤で容易に洗浄でき、銅管の耐久性を向上させることができる。
(2)前記有機酸がクエン酸であることにより、酸としての機能とキレート剤としての機能を発揮することができるとともに、このクエン酸は食品添加物として使用されるものであることから、銅管内面の洗浄処理における取扱性を向上させることができる。
(3)前記キレート剤はエチレンジアミン四酢酸塩であることにより、酸化銅に対するキレート化反応を効率良く進行させることができる。
(4)前記酸化剤は過酸化水素又は過炭酸塩であることにより、使用時に発生するガスが酸素ガスであるとともに、分解後には水又は炭酸塩が生成し、銅管内面の洗浄における作業性を向上させることができるとともに、環境に対する負荷を抑えることができる。
(5)銅管内面の洗浄方法では、前述した洗浄剤を銅管内に所定時間通液して銅管内面のカーボン皮膜を除去するものである。この洗浄方法によれば、簡単な操作により短時間で、銅管内面の損傷を抑えて耐久性を維持しつつ、銅管内面に形成されたカーボン皮膜を効果的に除去することができる。
Therefore, according to the cleaning agent for the inner surface of the copper tube of the present embodiment, the carbon film formed on the inner surface of the copper tube can be effectively removed while suppressing damage to the inner surface of the copper tube and maintaining corrosion resistance and durability. The effect is demonstrated. For this reason, the copper pipe currently piped by the refrigerator, the air conditioning circuit, the hot water supply circuit etc. can be easily wash | cleaned with the said cleaning agent, and the durability of a copper pipe can be improved.
(2) Since the organic acid is citric acid, the function as an acid and the function as a chelating agent can be exhibited, and the citric acid is used as a food additive. The handleability in the cleaning process of the inner surface of the pipe can be improved.
(3) Since the chelating agent is ethylenediaminetetraacetate, the chelation reaction for copper oxide can be efficiently advanced.
(4) Since the oxidizing agent is hydrogen peroxide or percarbonate, the gas generated at the time of use is oxygen gas, and water or carbonate is generated after decomposition, and workability in cleaning the inner surface of the copper tube Can be improved, and the load on the environment can be suppressed.
(5) In the method for cleaning the inner surface of the copper tube, the cleaning agent described above is passed through the copper tube for a predetermined time to remove the carbon film on the inner surface of the copper tube. According to this cleaning method, the carbon film formed on the inner surface of the copper tube can be effectively removed in a short time by a simple operation while suppressing damage to the inner surface of the copper tube and maintaining durability.

次に、実施例及び比較例を挙げて前記実施形態をさらに具体的に説明する。
(実施例1〜10及び比較例1)
実施例1〜10では、表1に示す組成で銅管内面の洗浄剤の水溶液(洗浄液)を調製した。そして、外径15.88mm、肉厚0.8mm及び長さ1mのリン脱酸銅管を用い、その銅管内に洗浄液を通水し、銅管内面の洗浄試験を行った。洗浄試験において、通水時間毎のカーボン皮膜の除去度合いと、銅管内面の減肉量を測定した。洗浄液量は5L、洗浄液の通水流速は0.1m/秒に設定し、洗浄液の通水を室温で行った。
Next, the embodiment will be described more specifically with reference to examples and comparative examples.
(Examples 1 to 10 and Comparative Example 1)
In Examples 1-10, the aqueous solution (cleaning liquid) of the cleaning agent of the copper pipe inner surface was prepared with the composition shown in Table 1. Then, a phosphorus deoxidized copper pipe having an outer diameter of 15.88 mm, a wall thickness of 0.8 mm, and a length of 1 m was used, and a cleaning liquid was passed through the copper pipe to conduct a cleaning test on the inner surface of the copper pipe. In the cleaning test, the degree of removal of the carbon film and the amount of thinning of the inner surface of the copper tube were measured for each water passage time. The amount of the cleaning liquid was 5 L, the water flow rate of the cleaning liquid was set to 0.1 m / sec, and the cleaning liquid was passed at room temperature.

洗浄前の銅管内面のカーボン皮膜付着量は8mg/mであった。カーボン皮膜の除去結果は、銅管内面に残存するカーボン皮膜の量を測定することにより判断した。表1のカーボン皮膜の除去結果の欄における○は、カーボン皮膜の残存量が1mg/m未満であることを表す。また、銅管内面の減肉量は、一定通水時間後の洗浄液中における銅イオン濃度と、銅管内面の面積から算出した。それらの結果を表1に示した。 The carbon film adhesion amount on the inner surface of the copper tube before cleaning was 8 mg / m 2 . The removal result of the carbon film was judged by measuring the amount of the carbon film remaining on the inner surface of the copper tube. “◯” in the column of the removal result of the carbon film in Table 1 indicates that the remaining amount of the carbon film is less than 1 mg / m 2 . Moreover, the thickness reduction of the copper pipe inner surface was computed from the copper ion concentration in the washing | cleaning liquid after a fixed water flow time, and the area of a copper pipe inner surface. The results are shown in Table 1.

なお、実施例8〜10のEDTAは、EDTA四ナトリウム塩:EDTA二ナトリウム塩=3:2のもの(洗浄液のpHは8〜9)を使用した。
一方、比較例1においては、洗浄剤を構成する酸として硫酸を用いるとともに、酸化剤として硫酸第二鉄を使用して、前記実施例1と同様の条件で銅管内面の洗浄試験を行った。そして、通水時間毎のカーボン皮膜の除去度合いと、銅管内面の減肉量を測定した。それらの結果を表1に示した。
In addition, the EDTA of Examples 8-10 used the thing of EDTA tetrasodium salt: EDTA disodium salt = 3: 2 (pH of a washing | cleaning liquid is 8-9).
On the other hand, in Comparative Example 1, while using sulfuric acid as the acid constituting the cleaning agent and using ferric sulfate as the oxidizing agent, a cleaning test of the inner surface of the copper tube was performed under the same conditions as in Example 1. . And the removal degree of the carbon membrane | film | coat for every water flow time and the thinning amount of the copper pipe inner surface were measured. The results are shown in Table 1.

表1に示したように、実施例1〜10では、洗浄剤を構成する酸としてスルファミン酸又はクエン酸、キレート剤としてEDTA又はクエン酸ナトリウムを用い、酸化剤として過酸化水素又は過炭酸ナトリウムを用いたことから、1〜3時間の洗浄時間で、銅管減肉量を抑えつつ、カーボン皮膜を除去することができた。また、実施例8〜10では、キレート剤としてEDTAを使用したことから、洗浄液のpHは8.5という弱アルカリ性を示し、中性に近いため、洗浄液の取扱いを良好にすることができた。 As shown in Table 1, in Examples 1 to 10, sulfamic acid or citric acid was used as the acid constituting the cleaning agent, EDTA or sodium citrate was used as the chelating agent, and hydrogen peroxide or sodium percarbonate was used as the oxidizing agent. Since it was used, it was possible to remove the carbon film while reducing the thinning amount of the copper pipe in a cleaning time of 1 to 3 hours. In Examples 8 to 10, since EDTA was used as the chelating agent, the pH of the cleaning solution was 8.5, which was weakly alkaline and close to neutrality, so that the cleaning solution could be handled well.

これに対し、比較例1では強酸である硫酸を用いたことから、カーボン皮膜の除去効果は高いが、銅管減肉量は非常に多くなり、耐久性が悪化した。
なお、前記実施形態を次のように変更して具体化することも可能である。
On the other hand, in Comparative Example 1, since sulfuric acid, which is a strong acid, was used, the effect of removing the carbon film was high, but the amount of thinning of the copper pipe was very large and the durability was deteriorated.
It should be noted that the embodiment described above can be modified and embodied as follows.

・ 前記洗浄液のpHを調節するために洗浄剤にpH調整剤を添加したり、銅管内面に対する洗浄液の接触を良くするために洗浄剤に界面活性剤を配合したりしてもよい。
・ 前記銅管内面の洗浄方法において、有機酸、スルファミン酸又はキレート剤の水溶液と、酸化剤の水溶液とを別々に調製し、銅管内に先に酸化剤の水溶液を通液して酸化銅を形成した後、有機酸、スルファミン酸又はキレート剤の水溶液を通液して酸化銅を取り除くように構成してもよい。
A pH adjuster may be added to the cleaning agent to adjust the pH of the cleaning solution, or a surfactant may be added to the cleaning agent to improve the contact of the cleaning solution with the inner surface of the copper tube.
-In the method for cleaning the inner surface of the copper pipe, an aqueous solution of an organic acid, sulfamic acid or chelating agent and an aqueous solution of an oxidizing agent are separately prepared, and the aqueous solution of the oxidizing agent is first passed through the copper pipe to obtain copper oxide After forming, an aqueous solution of an organic acid, sulfamic acid or chelating agent may be passed to remove copper oxide.

・ 前記銅管内面の洗浄時に、洗浄液を撹拌して銅管内面に対する洗浄液の接触を良くするように構成してもよい。
・ 前記銅管内面の洗浄時に銅管内の圧力を変更(例えば減圧)することも可能である。
-You may comprise so that a washing | cleaning liquid may be stirred and the contact of a washing | cleaning liquid with respect to a copper pipe inner surface may be improved at the time of the said copper pipe inner surface washing | cleaning.
-It is also possible to change the pressure in the copper tube (for example, to reduce the pressure) when cleaning the inner surface of the copper tube.

Claims (6)

銅管内面に形成された炭素質皮膜を除去するための銅管内面の洗浄剤であって、
有機酸又はスルファミン酸の水溶液と、酸化剤とを、炭素質皮膜を除去する有効成分として含有することを特徴とする銅管内面の洗浄剤。
A cleaning agent for the inner surface of the copper tube for removing the carbonaceous film formed on the inner surface of the copper tube,
A cleaning agent for an inner surface of a copper tube, comprising an aqueous solution of an organic acid or sulfamic acid and an oxidizing agent as active ingredients for removing a carbonaceous film.
前記有機酸はクエン酸であることを特徴とする請求項1に記載の銅管内面の洗浄剤。 The cleaning agent for an inner surface of a copper pipe according to claim 1, wherein the organic acid is citric acid. 銅管内面に形成された炭素質皮膜を除去するための銅管内面の洗浄剤であって、
キレート剤の水溶液と、酸化剤とを、炭素質皮膜を除去する有効成分として含有することを特徴とする銅管内面の洗浄剤。
A cleaning agent for the inner surface of the copper tube for removing the carbonaceous film formed on the inner surface of the copper tube,
A cleaning agent for an inner surface of a copper tube, comprising an aqueous solution of a chelating agent and an oxidizing agent as active ingredients for removing the carbonaceous film.
前記キレート剤はエチレンジアミン四酢酸塩であることを特徴とする請求項3に記載の銅管内面の洗浄剤。 The said chelating agent is ethylenediaminetetraacetate, The cleaning agent of the copper pipe inner surface of Claim 3 characterized by the above-mentioned. 前記酸化剤は過酸化水素又は過炭酸塩であることを特徴とする請求項1から請求項4のいずれか一項に記載の銅管内面の洗浄剤。 The said oxidizing agent is hydrogen peroxide or percarbonate, The cleaning agent of the copper pipe inner surface as described in any one of Claims 1-4 characterized by the above-mentioned. 請求項1から請求項5のいずれか一項に記載の銅管内面の洗浄剤を銅管内に通液して銅管内面の炭素質皮膜を除去することを特徴とする銅管内面の洗浄方法。 Cleaning the inner surface of a copper tube, wherein the cleaning agent for the inner surface of the copper tube according to any one of claims 1 to 5 is passed through the copper tube to remove a carbonaceous film on the inner surface of the copper tube. Method.
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