SU1263478A1 - Composition for pre-soldering treatment of surface - Google Patents

Abstract

The invention relates to the field of soldering, in particular, to a composition for preparing a soldered surface for soldering. The aim of the invention is to use parts with a surface that have completely lost the ability to be soldered, and to ensure high quality of the weld seam. The composition contains the components, wt.%: Glycerin 60-80, hydrochloric acid hydroxylamine 2-9, ammonium tetrafluoroborate 3-7, water - the rest. This composition evenly covers the fluxed or primed surface, has high activity, providing good flowability with S and acceleration of solder penetration into the gaps. 1 tab. (L

Description

The invention relates to soldering, in particular, compositions for preparing the surfaces of parts of hard-to-wear metals and alloys, for example, chromium-cell alloys of iron, nickel, zoniesel jelly jelly, manganin, stainless steel and other alloys for soldering with low-melting solders. The purpose of the invention is to use parts with a surface that completely lost soldering ability, and to provide high quality of the weld. The composition for preparing the brazed surface for brazing contains hydroxylamine hydrochloride and ammonium tetraborate in the following ratio, wt.%: Glycerin 60-80 Hydroxylamine hydro-acid. 2-9 Ammonium tetrafluoroborate 3-7. WaterReal

The use of hard-to-wear parts with a surface that completely lost their ability to solder, and ensuring high quality of the weld seam is achieved primarily due to the possibility of restoration (returning the surface of the parts) due to the ability to steam without changing the physico-technical parameters of the products and disturbing the integrity and strengthening layer on the boundary of the base metal and metal intended for soldering. This is achieved primarily by introducing into the composition containing active triatomic alcohol (hydrochloric acid hydroxylamine glycerin and ammonium tetrafluoroborate, which, in aqueous solutions, are more mobile, activate the transition of nitric oxide-carbonate complexes and discrete oxide compounds of both nitride and carbonate into metallic or organometallic compounds. The composition is well soluble in a number of organic compounds, and is able to form organometallic complexes both on the surface and in the gap (pore). The organic complexes with the elements boron are deoxidizer-E, reduced oxides and other metal compounds with inorganic zlementy finds schies surface pas emogo metal. Moreover, C is

SO.

but

but sn

or

+ C (OH)

CU + 2H.O

I. i

CHjOH

Such salts are formed when interacting with oxides, sulfide in and hydroxides of nickel, cobalt, zinc, etc. However, an increase in temperature during the formation of single-order oxides and, moreover, complex-type compounds, Co reduces the ability of glycerol to convert oxides into soluble complex compounds. The addition of hydroxylamine chloride and ammonium tetrafluoroborate enhances the ability to transfer compounds that prevent soldering and form new complexes that facilitate the use of parts with a surface that is completely lost — the ability to solder, ensuring high quality of the weld. The decrease in the viscosity of glycerol during the formation of water-glycerin mixtures increases the mobility of activating additives and contributes to the dissolution of activation centers, which are located on the surface and in the gap of the metal to be fired, entering into interaction with it, leads to a self-fluxing effect during soldering, ensuring This is the high quality of the weld seam as a result of the aforementioned self-fluxing mechanism and protective action (preventing penetration of, first of all, oxygen to the soldering point, which is present in the air where the soldering takes place) So, as a result of volatilization of fluoride and chloride, ammonium compounds at the time of soldering. Glycerin is a good solvent for minerals, salts, and many organic compounds. For example, with salts, oxides, and hydroxides of many metals, glycerin is able to participate in the formation of complex compounds, and each glycerol molecule takes up two coordination sites.

31

compounds which cannot be dissolved in glycerol.

Partially destroying (razzhl) dielectric, non-insulating cover, ammonium tetrafluoroborate or hydroxylamine hydroxylamine, restoring and oxidizing the surface, contributes to the formation of complex CH OH

SNON 3HNOj

the same will be observed with the formation of any halohydrin (complete or partial replacement). With strong aprotic compounds, for example ammonium tetrafluoroborate, in which the boron atom has pronounced electrophilic properties, the esters form oxonium compounds. In this case, the possibility of forming an oxonium compound with an ether of the same glycerol molecule, for example CH -, is essential. The liberated anions and cations, as well as some classes of organic compounds, actively interact on the metal surface with each other, forming additionally a number of organic compounds that are easily catalyzed by oxides. Further, the oxides are etched, loosened and reduced to the metallic state. A metal coat is formed with injected microquantities of boron and organometallic compounds, which, as it were, restore the surface and prepare it for the formation of a high quality weld seam. With an increase in hydroxylamine hydrochloride and ammonium tetrafluoroborate over 9 (e.g. 10) and 7 wt.% (E.g. 8), respectively, a decrease in the effect is observed, first of all, by impaired dissolving ability of these components in this composition and therefore it is active growth. On granny

263478 4

and ethers. glycerol with mineral and organic anionic residues present on the surface due to corrosion or other adsorption processes. In the presence of metals, this process is enhanced. For example, with nitrates formed during corrosion

/ main

Threat; about

Ni

Good

axes

CHjO-N; - OCHE salt clots are found on the chain of the weld; the effect of using such a composition is not found. Increasing the glycerol content above 80% (e.g., 90% by weight) dramatically increases the viscosity and decreases the solubility of the other components included in the proposed Composition and the intended purpose of the invention is not achieved. The goal is also not achieved with increasing water content by diluting the solution and reducing both its activity and its protective and restorative (restorative) effect. When reducing the amount of reagents beyond the limits by 4-6 wt.%, Of any single component or several, the possibility of using parts with a surface that completely lost the ability to solder and ensuring a high-quality weld seam disappears due to the disappearance of the properties of the composition. to perform its functions. The proposed composition evenly covers the fluxed or flooded surface, has a high activity, high cleaning effect, provides good flow and accelerates the penetration of solder into the gaps, which ensures high quality of the weld seam. Ensuring high quality of the weld seam when using the proposed Composition also occurs in connection with the ability of glycerin, hydroxylamine chloride and ammonium tetrafluoroboride, as well as their interaction products with each other and with the prepared surface when the temperature rises (when soldering) completely decompose into gaseous

components such as nitrogen, hydrogen, water, ammonia, carbon dioxide and. other more complex volatile compounds.

In addition, the components of the composition allow soldering without prior degreasing the surface in organic and inorganic solutions and compatibility with the operation of fluxing and degreasing.

The composition is water soluble and water washable.

The composition is prepared as follows.

To warm water in an amount of 350 ml, 20 g of hydroxylamine chloride and 30 g of ammonium tetrefluoroborate are added, carefully shaken to 1 solution of the reagents and 600 m of glycerin are added. All are carefully rewired until a uniform composition is formed (5-15 min). The treatment process is carried out at 25-30 C. The water temperature is 50-60 C.

Parts from hard-to-wear coatings that completely lose their ability to float are used.

Other composition ratios are prepared in the same sequence.

Examples of the composition and its properties are presented in the table.

Claims (1)

Invention Formula The composition, for the preparation of a soldered surface for brazing, consisting of glycerin and water, is sufficient for the fact that, in order to use parts with a surface that have completely lost the ability to husky, and to ensure high quality of the weld seam, it additionally contains hydrochloric acid hydroxylamine and ammonium tetrafluoroborate at the following ratio of components, wt%: Glycerin 60-80 20 Sol-sour hydroxylamine 2-9 Tetrafluoroborate ammonium 3-7 WaterEverything 60 7080 50 25.59 1.5 357 2.5 35 19.54 46 Surface Be4 Without 1Without primer impurities of this, prep-prep with soldering to the bushing soldering soldering 82 9.5 7.5 1 The surface of the parts is not prepared for soldering. Impurities 9.18 9.6 t, 8 0.28 Breaking force of the weld seam after 3 months after soldering, kgf / m O, 1 Breaking force after 9.2 6 months, kgf / m 0.12 9.6 9.6 0.76, 3 Breakage at the boundary of the weld seam under a load of 0.1