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Method for electroplating high-strength corrosion-proof cadmium-tin-titanium alloy on 304 or 316 L stainless steel surface

A technology of tin-titanium alloy and stainless steel, which is applied in the field of metal electroplating to achieve the effect of reducing cathodic hydrogen permeation, weak acidity, and reducing hydrogen embrittlement

Active Publication Date: 2017-10-13
无锡市恒利弘实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zinc is an anodic coating, while both cadmium and chromium are cathodic coatings. In the atmosphere and industrial atmosphere, the zinc layer has better protective performance than the cadmium layer, but when it is in direct contact with sea fog and sea water, the protection of the cadmium layer The performance is better than zinc, and it can effectively avoid the infiltration of environmental hydrogen, so it is widely used in parts of aviation, marine, radio and electronic products, but these coatings have a disadvantage, the coating must be more than 30 microns to achieve good Corrosion Resistance and Strength

Method used

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  • Method for electroplating high-strength corrosion-proof cadmium-tin-titanium alloy on 304 or 316 L stainless steel surface

Examples

Experimental program
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Effect test

Embodiment 1

[0023] In this treatment process, conventional chemical degreasing fluid and no anodic oxidation treatment are used. The specific treatment steps are:

[0024] (1) heating to relieve stress; (2) sand blasting; (3) chemical degreasing to use NaOH, Na 2 CO 3 , Na 3 PO4 Ultrasonic immersion in an alkaline degreasing agent composed of an emulsifier for 2 to 5 minutes to clean the surface of stainless steel; (4) high-current impact cyanide-free electroplating of cadmium; (5) low-current cyanide-free electroplating of cadmium-tin-titanium; (6) Heating to remove hydrogen; (7) passivation - hot water cleaning; (8) aging, natural cooling.

Embodiment 2

[0026] In this process, there is no high current cadmium plating, and cadmium tin titanium is directly electroplated. The specific processing steps are:

[0027] (1) Stress relief by heating; (2) Sand blasting; (3) Chemical degreasing; (4) Anodizing treatment; (5) Small current cyanide-free electroplating of cadmium-tin-titanium; (6) Heating dehydrogenation; (7) ) passivation - hot water cleaning; (8) aging, natural cooling.

Embodiment 3

[0029] In this treatment process, the electroplating solution does not contain titanium and tin, and the specific treatment steps are:

[0030] (1) Stress relief by heating; (2) Sand blasting; (3) Chemical degreasing; (4) Anodizing treatment; (5) After high current cyanide-free electroplating of cadmium, small current electroplating of cadmium; (6) Heating dehydrogenation; (7) Passivation - hot water cleaning; (8) Aging, natural cooling.

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Abstract

The invention provides a method for electroplating a protective plating layer of high-strength corrosion-proof cadmium-tin-titanium alloy on a 304 or 316 L stainless steel surface. The corrosion resistance of a plating layer is 6 to 7 times higher than that of a cadmium-plated layer, and the plating layer is uniform and fine and can be matched with cadmium-plated cyanide; after surface pre-treatment and in advanced cadmium-plating, the binding force of a cadmium-tin-titanium alloy plating layer is far more than that of the same kind of cadmium-tin plated alloy and the cadmium-plated layer; the cadmium-tin-titanium plating layer is porous, so that the hydrogen is beneficial for escaping; the cadmium-tin-titanium plating layer has good paintability, weldability, formability and low-hydrogen embrittlement; the whole preparation process is simple, cyanogen-free electroplating is achieved, and the preparation process is safe and environmentally-friendly.

Description

technical field [0001] The invention belongs to the field of metal electroplating, in particular to cyanide-free electroplating of cadmium-tin-titanium alloy on the surface of 304 or 316L stainless steel. Background technique [0002] Since the discovery of hydrogen embrittlement in the 1940s, it has been a major engineering problem that seriously threatens the safety of products. Due to the suddenness of the hydrogen embrittlement fracture of the part (no macro deformation, it is a brittle fracture, and the expansion is extremely fast), it is difficult to find (delayed failure, there is no sign before the fracture, and it is impossible to find out whether the part will occur through the normal inspection program), destructive (Hydrogen embrittlement is mostly related to "batch nature"). Therefore, once the hydrogen embrittlement fracture occurs in parts, it often causes very serious consequences. Generally, high-strength steel parts are more sensitive to hydrogen embrittle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/26C25D3/56C25D5/10C25D5/36C25D5/50C23C22/24C23C28/00
CPCC23C22/24C23C28/321C23C28/322C23C28/34C25D3/26C25D3/56C25D5/10C25D5/36C25D5/50
Inventor 白林森梁莲芝
Owner 无锡市恒利弘实业有限公司
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