JPH06212382A - Method for hot metal plating of high-strength steel sheet - Google Patents
Method for hot metal plating of high-strength steel sheetInfo
- Publication number
- JPH06212382A JPH06212382A JP473293A JP473293A JPH06212382A JP H06212382 A JPH06212382 A JP H06212382A JP 473293 A JP473293 A JP 473293A JP 473293 A JP473293 A JP 473293A JP H06212382 A JPH06212382 A JP H06212382A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- plating
- hot
- oxide film
- strength
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 48
- 239000010959 steel Substances 0.000 title claims abstract description 48
- 238000007747 plating Methods 0.000 title claims abstract description 44
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 13
- 239000002184 metal Substances 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 title claims abstract description 8
- 230000001603 reducing effect Effects 0.000 claims abstract description 32
- 238000002791 soaking Methods 0.000 claims abstract description 8
- 230000006698 induction Effects 0.000 claims abstract description 7
- 230000001678 irradiating effect Effects 0.000 claims abstract description 3
- 230000000694 effects Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 18
- 238000010438 heat treatment Methods 0.000 description 10
- 229910001335 Galvanized steel Inorganic materials 0.000 description 7
- 238000001816 cooling Methods 0.000 description 7
- 239000008397 galvanized steel Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000005275 alloying Methods 0.000 description 4
- 238000005246 galvanizing Methods 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 3
- 210000004894 snout Anatomy 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 101100165177 Caenorhabditis elegans bath-15 gene Proteins 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005244 galvannealing Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Landscapes
- Coating With Molten Metal (AREA)
Abstract
(57)【要約】
【目的】 本発明は、Ｐ、Ｓｉ等の高強度元素を含有す
る高張力鋼板の溶融金属めっき方法を提供する。
【構成】 溶融金属めっき前処理の均熱帯入側直前から
めっき浴前の間で、プラズマ放電電極および誘導電極に
指向して、還元ガスを供給しつつ、該電極にパルス電圧
を印加して鋼板表面に非平衡プラズマを照射し、鋼板表
面酸化膜を還元した後、めっきすることを特徴とする高
張力鋼板の溶融金属めっき方法。
【効果】 本発明によれば、従来、溶融金属めっきが困
難であったＰ、Ｓｉ等を鋼中に含有する高張力鋼板の場
合にも、めっき密着性に優れた溶融金属めっき高張力鋼
板を得ることができる。
(57) [Summary] [Object] The present invention provides a method for hot-dip plating of high-strength steel sheet containing high-strength elements such as P and Si. [Structure] From immediately before the soaking zone on the pretreatment of the molten metal plating to before the plating bath, a reducing gas is supplied toward the plasma discharge electrode and the induction electrode, and a pulse voltage is applied to the electrode to produce a steel sheet. A method for hot-dip metal plating of a high-strength steel sheet, which comprises irradiating a non-equilibrium plasma on the surface to reduce an oxide film on the steel sheet surface, and then performing plating. [Effects] According to the present invention, even in the case of a high-strength steel sheet containing P, Si, etc. in the steel, which has been difficult to perform hot-dip metal plating, a high-strength hot-dip steel sheet having excellent plating adhesion can be provided. Obtainable.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、Ｐ、Ｓｉ等の酸化物の
ような難還元性酸化膜を表面に形成しやすい高張力鋼板
において、めっき前に非平衡プラズマにより酸化膜を還
元除去し、めっき密着性の良好な高張力鋼板の溶融金属
めっき方法に関するものである。BACKGROUND OF THE INVENTION The present invention relates to a high-strength steel sheet on which a difficult-to-reduce oxide film such as an oxide of P, Si, etc. is easily formed on the surface by reducing and removing the oxide film by non-equilibrium plasma before plating. The present invention relates to a method for hot-dip metal plating of a high-strength steel sheet having good plating adhesion.
【０００２】[0002]
【従来の技術】高張力鋼板は、鋼中に高強度化のため
Ｐ、Ｓｉ等が添加されており、溶融金属めっきの前処理
時の熱処理によって、鋼板表面に難還元性の酸化膜（Ｐ
2 Ｏ5 、ＳｉＯ2 等）が形成する。通常の鋼板では、加
熱後に、加熱帯において還元ガス（Ｈ2 およびＮ2 ）を
吹込み、鋼板表面の酸化膜を還元除去し、均熱帯におい
て材質を調整し、冷却後、めっきを施すが、該難還元性
の酸化膜は、このような還元ガスのみでは還元すること
は困難である。2. Description of the Related Art High-strength steel sheets have P, Si, etc. added to them to increase their strength, and a heat-reducing heat treatment during the pretreatment of hot-dip galvanizing causes a hard-to-reduce oxide film (P
2 O 5 , SiO 2 etc.) are formed. In a normal steel sheet, after heating, a reducing gas (H 2 and N 2 ) is blown in the heating zone to reduce and remove the oxide film on the surface of the steel sheet, the material is adjusted in the soaking zone, and the plating is performed after cooling. It is difficult to reduce the hardly reducing oxide film only with such a reducing gas.
【０００３】鋼板表面に酸化膜が残存したまま、溶融め
っきが施されると不めっき部分が発生し、又めっきされ
てもめっき密着性が良くない。この対策として、特開平
４−５２２１１号公報にあるようにプラズマトーチに作
動ガス（アルゴンガス等）とともに還元性ガスを供給
し、還元ガスのプラズマジェットにより、金属体表面の
酸化膜を還元する方法が開示されている。しかしなが
ら、該プラズマジェットは指向性が強いので、ジェット
流の中央部と周辺では還元能力に差が生じるため、ミク
ロンオーダーの酸化膜を確実に還元することは困難であ
り、鋼板の表面酸化膜が局所的に残存し、溶融金属めっ
き後にめっきムラや局所的な不めっき等が生じ、又めっ
き密着性が劣る等の欠点がある。更に、該プラズマジェ
ットではラジカルの生成効率が低く、供給した還元ガス
の１％程度しかラジカル化しないので、Ｐ2 Ｏ5 に比べ
難還元性のＳｉＯ2 では還元がほとんどできず、特に不
めっきが生じやすい。When hot dip plating is performed with an oxide film remaining on the surface of a steel sheet, an unplated portion is generated, and even if plated, the plating adhesion is not good. As a countermeasure against this, as described in JP-A-4-52211, a method of supplying a reducing gas together with a working gas (argon gas or the like) to a plasma torch and reducing an oxide film on the surface of a metal body by a plasma jet of the reducing gas. Is disclosed. However, since the plasma jet has a strong directivity, there is a difference in the reducing ability between the central part and the periphery of the jet flow, so it is difficult to reliably reduce the micron-order oxide film, and the surface oxide film of the steel sheet is There are drawbacks such that they remain locally, uneven plating and local non-plating occur after the molten metal plating, and the plating adhesion is poor. Furthermore, since the plasma jet has a low radical generation efficiency and only about 1% of the supplied reducing gas is converted into radicals, SiO 2 which is harder to reduce than P 2 O 5 can hardly be reduced, and in particular, non-plating occurs. It is easy to occur.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、このような
欠点を有利に解決するためになされたものである。SUMMARY OF THE INVENTION The present invention has been made in order to advantageously solve such a drawback.
【０００５】[0005]
【課題を解決するための手段】本発明の要旨とするとこ
ろは、溶融金属めっき前処理の均熱帯入側直前からめっ
き浴前の間で、プラズマ放電電極および面状誘導電極に
指向して還元ガスを供給しつつ、電極にパルス電圧を印
加して鋼板表面に非平衡プラズマを照射し、鋼板表面酸
化膜を還元した後、めっきすることを特徴とする高張力
鋼板の溶融金属めっき方法にある。The gist of the present invention is that reduction is performed toward the plasma discharge electrode and the planar induction electrode between immediately before the soaking zone of the pretreatment of the molten metal plating and before the plating bath. A molten metal plating method for a high-strength steel sheet, which comprises applying a pulse voltage to an electrode to irradiate a non-equilibrium plasma on the steel sheet surface while supplying gas to reduce the steel sheet surface oxide film, and then plating. .
【０００６】本発明は、還元性雰囲気において、プラズ
マ放電電極および面状誘導電極に、パルス電圧（１パル
ス当りの印加時間は０．５ｎｓ〜１０μｓ）を加えるこ
とによって、イオンや中性子を加速することなく、電子
のみが加速され、この電子により得られた還元ラジカル
（水素ラジカルなど）からなるプラズマ（以下、非平衡
プラズマと呼ぶ）は従来のプラズマトーチにより生じた
プラズマジェットとは異なり、指向性が弱く、還元領域
が広く、従って鋼板表面の難還元性酸化膜が確実に還元
できるため、めっき密着性等の良好な高張力溶融金属め
っき鋼板が製造できるものである。The present invention accelerates ions and neutrons by applying a pulse voltage (application time per pulse is 0.5 ns to 10 μs) to a plasma discharge electrode and a planar induction electrode in a reducing atmosphere. However, only electrons are accelerated, and plasma (hereinafter referred to as non-equilibrium plasma) composed of reducing radicals (hydrogen radicals etc.) obtained by these electrons has a different directivity from the plasma jet generated by the conventional plasma torch. Since it is weak and has a wide reduction area, and therefore the hard-to-reduce oxide film on the surface of the steel sheet can be surely reduced, a high-strength hot-dip galvanized steel sheet having good plating adhesion and the like can be produced.
【０００７】即ち、非平衡プラズマは、本発明者等の知
見によれば、プラズマジェットを生成するイオンや中性
子に比べて電子の質量が極めて小さいために運動エネル
ギーが小さいこと、高圧の作動ガスを使用せずにパルス
放電を用いて電子を加速するため加速方向が広範囲であ
り、得られた還元ラジカルの加速方向も広範囲となるた
め鋼板表面全域の酸化膜を確実に還元できることが明ら
かになった。That is, according to the knowledge of the inventors of the present invention, non-equilibrium plasma has a small kinetic energy because the mass of electrons is extremely smaller than that of ions and neutrons that generate plasma jets. It has been revealed that the acceleration direction of electrons is accelerated over a wide range using pulsed discharge without using it, and the acceleration direction of the obtained reducing radicals is also wide, so that the oxide film on the entire surface of the steel sheet can be reliably reduced. .
【０００８】次に、非平衡プラズマの照射例を図１によ
って説明する。絶縁体基板２の表面に放電用電極３を設
け、更にギャップを有して対面する面状誘導電極４を設
け、両電極３、４に指向する還元ガス供給配管５により
還元ガス（水素ガス、メタンガス、一酸化炭素ガス、ア
ンモニアガス等）を供給し、両電極３、４付近を還元性
雰囲気７にする。電極３、４に１パルス当り０．５ｎｓ
〜１０μｓ間電圧を印加することにより、電子のみ加速
され、還元性雰囲気７にて還元ラジカルから非平衡プラ
ズマ８が生成し、鋼板９に照射することによって鋼板表
面の酸化膜が還元される。電圧印加時間が１０μｓ超で
は、イオンや中性子も加速されることがあり、指向性も
強くなり、均一な還元領域が狭くなり、局所的に酸化膜
が残存するおそれがあり、好ましくない。又０．５ｎｓ
未満は、電源が極めて高価であり、コスト的に不利であ
る。また、パルス周波数としては、２００Ｈｚ〜１００
ｋＨｚのいづれでもかまわないが、周波数が高い程、還
元ラジカルの単位時間当りの生成率が向上し、還元力も
向上する。２００Ｈｚ未満では単位時間当りの還元ラジ
カルの生成量が少ないので効率が悪い。１００ｋＨｚ超
では電源が高価になりすぎてコスト的に不利である。Next, an example of non-equilibrium plasma irradiation will be described with reference to FIG. A discharge electrode 3 is provided on the surface of the insulator substrate 2, and a planar induction electrode 4 is provided to face each other with a gap, and a reducing gas (hydrogen gas, hydrogen gas, Methane gas, carbon monoxide gas, ammonia gas, etc.) are supplied to create a reducing atmosphere 7 in the vicinity of both electrodes 3, 4. 0.5 ns per pulse for electrodes 3 and 4
By applying a voltage for 10 μs, only electrons are accelerated, non-equilibrium plasma 8 is generated from the reducing radicals in the reducing atmosphere 7, and the steel sheet 9 is irradiated to reduce the oxide film on the surface of the steel sheet. When the voltage application time exceeds 10 μs, ions and neutrons may be accelerated, the directivity may be strengthened, the uniform reduction region may be narrowed, and the oxide film may remain locally, which is not preferable. Again 0.5 ns
Below 1, the power supply is extremely expensive, which is a cost disadvantage. The pulse frequency is 200 Hz to 100
Either of kHz may be used, but the higher the frequency, the higher the production rate of reducing radicals per unit time and the reducing power. If the frequency is less than 200 Hz, the amount of reducing radicals generated per unit time is small, resulting in poor efficiency. Above 100 kHz, the power supply becomes too expensive, which is disadvantageous in terms of cost.
【０００９】鋼板９と面状誘導電極４との間の距離は１
０〜５００ｍｍが好ましい。１０ｍｍ未満では、鋼板の
振動等により、鋼板が電極に衝突し、鋼板表面に傷がつ
いて製品価値が著しく低下する場合がある。５００ｍｍ
超では、パルス電源の必要電圧が大きすぎて設備が巨大
化し、コスト的に不利である。鋼板の通板速度として
は、通常の５０〜２００ｍ／分で高生産性を維持しつ
つ、密着性に優れためっき鋼板を製造することができ
る。The distance between the steel plate 9 and the planar induction electrode 4 is 1
0-500 mm is preferable. If the thickness is less than 10 mm, the steel plate may collide with the electrode due to vibration of the steel plate or the like, the surface of the steel plate may be scratched, and the product value may be significantly reduced. 500 mm
If it is over, the required voltage of the pulse power supply is too large, and the equipment becomes huge, which is disadvantageous in terms of cost. The steel sheet passing speed is usually 50 to 200 m / min, and it is possible to manufacture a plated steel sheet having excellent adhesion while maintaining high productivity.
【００１０】適用される溶融金属めっき鋼板としては、
亜鉛めっき鋼板、Ａｌめっき鋼板、亜鉛−Ａｌめっき鋼
板等通常工業的に製造されたものに適用できる。亜鉛め
っき鋼板としては、例えば、溶融亜鉛めっき鋼板、鉄−
亜鉛合金化溶融亜鉛めっき鋼板、めっき層断面方向で下
層が合金化されている合金化溶融亜鉛めっき鋼板（一般
にハーフアロイと称す）、片面鉄−亜鉛合金化溶融亜鉛
めっき層、他面溶融亜鉛めっき層からなる鋼板、これら
のめっき層上に電気めっき、蒸着めっき等により亜鉛又
は亜鉛含有金属をめっきした鋼板等がある。The hot-dip galvanized steel sheet to be applied includes
It can be applied to normally industrially manufactured products such as galvanized steel plate, Al plated steel plate, and zinc-Al plated steel plate. Examples of the galvanized steel sheet include hot-dip galvanized steel sheet and iron-
Zinc alloyed hot-dip galvanized steel sheet, alloyed hot-dip galvanized steel sheet in which the lower layer is alloyed in the cross-section direction of the plating layer (generally called half alloy), single-sided iron-zinc alloyed hot-dip galvanized layer, other surface hot-dip galvanized There are steel sheets composed of layers, steel sheets obtained by plating zinc or a zinc-containing metal on these plated layers by electroplating, vapor deposition plating and the like.
【００１１】次に、本発明の一例を図面によって説明す
る。図２に合金化溶融亜鉛めっきラインの一例を示す。
前処理炉は加熱帯、均熱帯、冷却帯および、それらの接
続部から構成されている。高張力鋼板９を加熱帯１０に
て室温〜１０００℃に１０〜１８０秒加熱して、還元性
雰囲気中で鋼板表面の酸化膜を還元し、接続部Ａを通っ
て、均熱帯１１において６００〜１０００℃に１０〜１
８０秒加熱して材質を調整し、接続部Ｂを通って冷却帯
１２でめっきに好適な板温に調整し、接続部Ｃ、スナウ
ト１３を介して鋼板９を溶融金属めっき浴１４に浸漬し
て、めっきを施し、浴上でガスワイピングノズル１５に
て、目的とするめっき量にした後、必要に応じて合金化
炉１６にて合金化処理を施して、成品とする。Next, an example of the present invention will be described with reference to the drawings. FIG. 2 shows an example of the galvannealing line.
The pretreatment furnace is composed of a heating zone, a soaking zone, a cooling zone and their connecting parts. The high-tensile steel plate 9 is heated in the heating zone 10 at room temperature to 1000 ° C. for 10 to 180 seconds to reduce the oxide film on the surface of the steel plate in a reducing atmosphere, pass through the connection portion A, and 600 to 600 in the soaking zone 11. 10 to 1 at 1000 ° C
The material is adjusted by heating for 80 seconds, the plate temperature is adjusted in the cooling zone 12 through the connection part B, and the steel plate 9 is immersed in the molten metal plating bath 14 through the connection part C and the snout 13. After plating, the gas wiping nozzle 15 is used to achieve a desired plating amount on the bath, and then an alloying furnace 16 is subjected to an alloying treatment if necessary to obtain a product.
【００１２】非平衡プラズマによって鋼板９表面の酸化
膜を除去する部位としては、前記のごとく、還元帯入側
直前からめっき浴前の間であればよく、例えば接続部
Ａ、Ｂ、Ｃのいずれか１箇所又は２箇所以上で非平衡プ
ラズマを照射することにより、確実に酸化膜を還元する
ことができるが、好ましくは、可能な限り、めっき浴に
近い箇所が好ましい。As described above, the portion for removing the oxide film on the surface of the steel sheet 9 by the non-equilibrium plasma may be between immediately before the reduction zone entering side and before the plating bath, for example, any of the connecting portions A, B and C. The oxide film can be surely reduced by irradiating the non-equilibrium plasma at one place or at two or more places, but it is preferable that the place is as close to the plating bath as possible.
【００１３】即ち、本発明においては、還元雰囲気によ
る酸化膜の還元作用と、非平衡プラズマによる酸化膜の
還元作用により鋼板表面の酸化膜を確実に除去し、めっ
きの密着性等を向上させるものである。That is, in the present invention, the oxide film on the surface of the steel sheet is surely removed by the reducing action of the oxide film by the reducing atmosphere and the reducing action of the oxide film by the non-equilibrium plasma, and the adhesion of plating is improved. Is.
【００１４】[0014]
【実施例】本発明の実施例と比較例を表１に示す。実施
例は、非平衡プラズマの照射により、めっき前に高張力
鋼板表面の難還元性の酸化膜が確実に還元除去されてお
り、優れためっき密着性が得られている。一方、比較例
は、難還元性の酸化膜が高張力鋼板表面に残存している
ので、めっき密着性が良くない。EXAMPLES Examples of the present invention and comparative examples are shown in Table 1. In the example, the non-reducing oxide film on the surface of the high-tensile steel sheet was surely reduced and removed by the irradiation of the non-equilibrium plasma, and excellent plating adhesion was obtained. On the other hand, in the comparative example, the non-reducing oxide film remains on the surface of the high-strength steel sheet, and therefore the plating adhesion is not good.
【００１５】[0015]
【表１】 [Table 1]
【００１６】注１）実施例１〜９、比較例１〜３のめっ
き鋼板は、Ｐ、Ｓｉ以外にはＣ：０．０２％、Ｍｎ：
０．２５％、Ｓ：０．００３％、残Ｆｅからなる高張力
鋼板。 注２）前処理炉加熱帯は、間接加熱で雰囲気がＨ2 １０
％、残Ｎ2 、均熱帯は間接加熱で雰囲気がＨ2 １０％、
残Ｎ2 、冷却帯は雰囲気がＨ2 １０％、残Ｎ2 。 注３）通板速度は１００ｍ／ｍｉｎ。板幅は１０００〜
１６００ｍｍ。 注４）実施例のプラズマ照射条件は、パルスピーク電圧
５ｋＶ（一定として）、高張力鋼板とプラズマ発生装置
との間隔３０〜９０ｍｍ。照射部位としては、Ａは加熱
帯と還元帯の接続部、Ｂは還元帯と冷却帯の接続部、Ｃ
は冷却帯とスナウトの接続部である。尚、還元ガス流量
は５００ｌ／分である。比較例のプラズマ照射条件は、
幅方向に２００ｍｍピッチに配置したプラズマトーチに
作動ガスＡｒと還元ガスＨ2 を供給して直流電圧１０ｋ
Ｖを印加し、発生したプラズマジェットにより還元し
た。作動ガス流量は１００ｌ／分、還元ガス流量は５０
０ｌ／分である。照射部位のＡ、Ｂ、Ｃは実施例と同じ
である。 注５）めっきは、溶融亜鉛めっき（実施例１、２、４、
５、７、８、比較例１、２）または合金化溶融亜鉛めっ
き（実施例３、６、９、比較例３）を施した。めっき浴
温は４５０℃×２秒、合金化温度は５００℃×２０秒で
ある。 注６）めっき密着性は、加工前に曲げ加工部にビニール
テープをはり、テープ面を内側とする曲げ加工（曲げ角
６０°）を行い、再度開いてテープをはがし、めっき層
がテープに付着して黒変した部分の有無で不良と良好の
評価を行った。Note 1) In the plated steel sheets of Examples 1 to 9 and Comparative Examples 1 to 3, C: 0.02% and Mn: other than P and Si.
A high-tensile steel plate composed of 0.25%, S: 0.003%, and residual Fe. Note 2) The heating zone of the pretreatment furnace is indirectly heated and the atmosphere is H 2 10
%, The balance N 2 , the atmosphere is H 2 10% due to indirect heating in the soaking zone,
The balance is N 2 , the atmosphere in the cooling zone is H 2 10%, and the balance is N 2 . Note 3) The strip running speed is 100 m / min. Board width is 1000 ~
1600 mm. Note 4) The plasma irradiation conditions in the examples are pulse peak voltage 5 kV (assuming constant), and the distance between the high-tensile steel plate and the plasma generator is 30 to 90 mm. As the irradiation site, A is a connecting portion between the heating zone and the reduction zone, B is a connecting portion between the reduction zone and the cooling zone, and C is
Is the connection between the cooling zone and the snout. The reducing gas flow rate is 500 l / min. The plasma irradiation conditions of the comparative example are
A working voltage Ar and a reducing gas H 2 were supplied to a plasma torch arranged at a pitch of 200 mm in the width direction to obtain a DC voltage of 10 k.
V was applied and reduced by the generated plasma jet. Working gas flow rate is 100 l / min, reducing gas flow rate is 50
0 l / min. Irradiation sites A, B and C are the same as in the example. Note 5) The plating is hot dip galvanizing (Examples 1, 2, 4,
5, 7, 8 and Comparative Examples 1 and 2) or hot dip galvanizing (Examples 3, 6, 9 and Comparative Example 3) were applied. The plating bath temperature is 450 ° C. × 2 seconds, and the alloying temperature is 500 ° C. × 20 seconds. Note 6) For plating adhesion, before processing, apply a vinyl tape to the bent part, perform a bending process with the tape surface inside (bending angle 60 °), open it again and peel off the tape, the plating layer adheres to the tape Then, the presence or absence of a blackened portion was evaluated as defective or good.
【００１７】[0017]
【発明の効果】本発明によれば、従来、溶融金属めっき
が困難であったＰ、Ｓｉ等を鋼中に含有する高張力鋼板
においても、めっき密着性に優れた溶融金属めっき高張
力鋼板を工業的に安定して得ることができる。INDUSTRIAL APPLICABILITY According to the present invention, even in a high-strength steel sheet containing P, Si, etc. in the steel, which has been difficult to perform hot-dip galvanizing in the past, a high-strength hot-dip metal plated steel sheet having excellent plating adhesion can be provided. It can be obtained industrially stably.
【図１】非平衡プラズマの照射例を示す図である。FIG. 1 is a diagram showing an example of irradiation of non-equilibrium plasma.
【図２】本発明の実施の態様の一例を示す図である。FIG. 2 is a diagram showing an example of an embodiment of the present invention.
【符号の説明】 １ パルス電源 ２ 絶縁体基板 ３ 放電用電極 ４ 面状誘導電極 ５ 還元ガス供給配管 ６ 基本補強材 ７ 還元性雰囲気 ８ 非平衡プラズマ ９ 鋼板 １０ 加熱帯 １１ 均熱帯 １２ 冷却帯 １３ スナウト １４ めっき浴 １５ ガスワイピングノズル １６ 合金化炉[Explanation of symbols] 1 pulse power supply 2 insulator substrate 3 discharge electrode 4 planar induction electrode 5 reducing gas supply pipe 6 basic reinforcing material 7 reducing atmosphere 8 non-equilibrium plasma 9 steel plate 10 heating zone 11 soaking zone 12 cooling zone 13 Snout 14 Plating bath 15 Gas wiping nozzle 16 Alloying furnace
Claims (1)
からめっき浴前の間で、プラズマ放電電極および面状誘
導電極に指向して還元ガスを供給しつつ、電極にパルス
電圧を印加して鋼板表面に非平衡プラズマを照射し、鋼
板表面酸化膜を還元した後、めっきすることを特徴とす
る高張力鋼板の溶融金属めっき方法。1. A pulse voltage is applied to the electrodes while directing a reducing gas toward the plasma discharge electrode and the planar induction electrode between immediately before the soaking zone on the pretreatment of the molten metal plating and before the plating bath. Method for irradiating non-equilibrium plasma on the surface of a steel sheet to reduce an oxide film on the surface of the steel sheet, and then performing plating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP473293A JPH06212382A (en) | 1993-01-14 | 1993-01-14 | Method for hot metal plating of high-strength steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP473293A JPH06212382A (en) | 1993-01-14 | 1993-01-14 | Method for hot metal plating of high-strength steel sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06212382A true JPH06212382A (en) | 1994-08-02 |
Family
ID=11592082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP473293A Withdrawn JPH06212382A (en) | 1993-01-14 | 1993-01-14 | Method for hot metal plating of high-strength steel sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06212382A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100815811B1 (en) * | 2006-12-28 | 2008-03-20 | 주식회사 포스코 | Manufacturing method of hot dip galvanized steel sheet with excellent plating wettability and adhesion |
| CN102268625A (en) * | 2011-08-03 | 2011-12-07 | 江苏大学 | Method for hot dipping aluminum for steel structure |
| JP2012515843A (en) * | 2009-01-22 | 2012-07-12 | エスエムエス・ジーマーク・アクチエンゲゼルシャフト | Method and apparatus for removing scale by annealing stainless steel strip |
| JP2018506644A (en) * | 2014-12-24 | 2018-03-08 | ポスコＰｏｓｃｏ | Zinc alloy-plated steel material excellent in weldability and corrosion resistance of machined part and method for producing the same |
| JP2021147654A (en) * | 2020-03-18 | 2021-09-27 | Ｊｆｅスチール株式会社 | Method of reducing and removing metal oxide |
-
1993
- 1993-01-14 JP JP473293A patent/JPH06212382A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100815811B1 (en) * | 2006-12-28 | 2008-03-20 | 주식회사 포스코 | Manufacturing method of hot dip galvanized steel sheet with excellent plating wettability and adhesion |
| JP2012515843A (en) * | 2009-01-22 | 2012-07-12 | エスエムエス・ジーマーク・アクチエンゲゼルシャフト | Method and apparatus for removing scale by annealing stainless steel strip |
| CN102268625A (en) * | 2011-08-03 | 2011-12-07 | 江苏大学 | Method for hot dipping aluminum for steel structure |
| JP2018506644A (en) * | 2014-12-24 | 2018-03-08 | ポスコＰｏｓｃｏ | Zinc alloy-plated steel material excellent in weldability and corrosion resistance of machined part and method for producing the same |
| US10584407B2 (en) | 2014-12-24 | 2020-03-10 | Posco | Zinc alloy plated steel material having excellent weldability and processed-part corrosion resistance and method of manufacturing same |
| JP2020169388A (en) * | 2014-12-24 | 2020-10-15 | ポスコＰｏｓｃｏ | Zinc alloy plated steel material excellent in weldability and processed part corrosion resistance, and its manufacturing method |
| US11248287B2 (en) | 2014-12-24 | 2022-02-15 | Posco | Zinc alloy plated steel material having excellent weldability and processed-part corrosion resistance |
| JP2021147654A (en) * | 2020-03-18 | 2021-09-27 | Ｊｆｅスチール株式会社 | Method of reducing and removing metal oxide |
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