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Pretreating method for improving brazing performance of stainless steel

A pretreatment, stainless steel technology, applied in the direction of welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problem of inability to obtain adhesion coating, etc., to achieve the effect of improving brazing performance, high adhesion, and preventing wear

Inactive Publication Date: 2012-05-16
张国斌
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  • Description
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Problems solved by technology

Since there is a thin and transparent oxide film on the surface of stainless steel, which can be quickly formed after removal, it is impossible to obtain a coating with good adhesion according to the electroplating process of general steel parts.

Method used

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Embodiment Construction

[0010] A pretreatment method for improving the brazing performance of stainless steel, realizing the method comprises the following steps:

[0011] (1) Degreasing: Wet one of trichlorethylene, ethyl acetate, acetone and butanone with absorbent cotton and wipe it. After removing the oil, wipe it 2-4 times with a clean cotton cloth;

[0012] (2) Immersion activation: use 98% sulfuric acid 300-400, temperature 65-85 ° C, 1min-2min;

[0013] (3) Activation and pre-plating: the parts by weight of the solution are: nickel chloride hexahydrate 20-200, 37% hydrochloric acid 15-60, cathode treatment current density 0.5-10, normal temperature, time 2-4min;

[0014] 2. The pretreatment method for improving the corrosion resistance of magnesium and magnesium alloys according to claim 1, before the cathodic treatment in step (3), first anodize at 2A / dm2 for 2 minutes, and then cathodic treatment.

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Abstract

The invention provides a pretreating method for improving the brazing performance of stainless steel. The method comprises the following steps of: (1) removing oil: wetting one of ethylene trichloride, acetic ether, acetone and butanone with absorbent cotton for wiping, removing oil stains, and wiping with a clean cotton fabric for 2-4 times; (2) soaking and activating: soaking and activating with 300-400 parts by weight of 98 percent sulfuric acid at the temperature of 65-85 DEG C for 1-2 minutes; and (3) activating and pre-plating: activating and pre-plating with a solution which comprises 20-200 parts by weight of hexahydrate nickel dichloride and 15-60 parts by weight of 37 percent sulfuric acid at the cathode treatment current density of 0.5-10 at the normal temperature for 2-4 minutes. Due to the adoption of the pretreating method, the brazing performance of stainless steel can be improved by plating proper metals, high-temperature oxidation is relieved, the heat conductivity and electric conductivity are increased, high adhesion is ensured, the stainless steel is more glossy, attractive and resistant to rusting and wear, and the electric conductivity, lubricating property, strength, heat resistance and weather resistance are improved.

Description

technical field [0001] The invention proposes a pretreatment method for improving the brazing performance of stainless steel. Background technique [0002] Pre-plating treatment and post-plating treatment occupy an extremely important position in the metal surface plating process. Many defects in products manufactured by surface plating technology are often caused by improper pre-treatment or post-treatment. The purpose of surface roughening is to To improve the bonding strength of the coating, it can be roughened by mechanical or chemical methods. Sensitization treatment makes the substance (catalytic film) on the surface of the adsorption layer easy to oxidize and acts as a reducing agent for catalytic metal ions in the next step of activation. After the sensitized surface is rinsed with water, it is immersed in the activation solution containing catalytic metal ions, and the catalytic metal ions react with the substances that are easily oxidized and adsorbed on the surfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/20
Inventor 张国斌
Owner 张国斌
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