Process for plating cadmium on shaped steel part with deep/blind hole

A special-shaped steel, cadmium plating technology, applied in the plating of superimposed layers, metal material coating process, coating and other directions, can solve the problems of difficult solution control and maintenance, poor deep plating and coverage ability, narrow current density range, etc. , to achieve the effect of not easy natural decomposition and aging, excellent deep plating ability, and wide current density range

Inactive Publication Date: 2011-01-12
CHANGAN AUTOMOBILE (GRP) CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] Cadmium plating is generally used in special industries such as aviation and military industry. At present, most manufacturers use the cyanide cadmium plating process, and only a few of them

Method used

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  • Process for plating cadmium on shaped steel part with deep/blind hole
  • Process for plating cadmium on shaped steel part with deep/blind hole

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[0043] The present invention will be further described below in conjunction with the drawings.

[0044] Prepare the plating solution first, the preparation method is as follows:

[0045] First formula

[0046] (1) Weigh 210g / L of ammonium chloride and pour it into the tank, add hot water at about 80°C to one third of the tank volume, and stir to completely dissolve it;

[0047] (2) Weigh 50g / L of cadmium sulfate and add it to the ammonium chloride solution, stir to dissolve, and obtain a cadmium sulfate-ammonium chloride solution;

[0048] (3) Weigh nitrilotriacetic acid (NTA) at 70g / L, and ethylenediaminetetraacetic acid (EDTA) at 30g / L. Mix nitrilotriacetic acid and ethylenediaminetetraacetic acid in another container to make a paste Use 20% (mass) sodium hydroxide solution under constant stirring to slowly add until the solution is transparent (the pH value is about 5.8), and then add this solution to the cadmium sulfate-ammonium chloride solution;

[0049] (4) Adjust the pH value to...

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Abstract

The invention discloses a process for plating cadmium on a shaped steel part with a deep/blind hole, which comprises the following steps of: chemical oil removal, electrolytic oil removal, hot water washing, cold water washing, acid washing, cold water washing, neutralizing, cold water washing, cyanogen-less cadmium plating, cold water washing, hot water washing, compressed air drying, tempering dehydrogenizing, bright dipping, cold water washing, surface conditioning, middle-temperature phosphating, cold water washing, drying and detection, wherein the formula of each liter of electroplating liquid comprises: 40 to 50g of cadmium sulfate, 180 to 220g of ammonium chloride, 50 to 70g of nitrilotriacetic acid, 25 to 30g of ethylene diamine tetraacetic acid, a main additive, a brightener and a refiner, and the pH value is 6.2 to 6.7. The process effectively improves the quality and stability of special products, guarantees the use performance of the products and prolongs the service life of the products; and the production process is clean and environmentally-friendly, can effectively protect the environment and the physical and metal health of operators and meets the requirements of pollution-free production.

Description

Technical field [0001] The invention relates to a surface treatment method and equipment for metal products, in particular to a process for plating cadmium on special-shaped steel parts with deep / blind holes, in particular to a cyanide-free cadmium plating suitable for large-scale production, clean and environmentally friendly Craft. Background technique [0002] In the past, the surface anti-corrosion treatment of special-shaped workpieces with deep holes and blind holes has always been cyanide electroplating due to its complex shape, high performance requirements, and harsh use environment. But cyanide is a highly toxic chemical, and it is quite complicated to purchase, transport, store, and manage. The gas that escapes during the cyanide electroplating production process is also toxic, and the treatment of cyanide wastewater requires extremely high safety and ventilation. In order to eliminate the harm caused by highly toxic cyanide and effectively protect the environment an...

Claims

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Application Information

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IPC IPC(8): C25D3/26C25D5/34C25D5/48C23C28/00C23C22/07
Inventor 黄平彭先勇
Owner CHANGAN AUTOMOBILE (GRP) CO LTD
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