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High-corrosion-resistance bright soft zinc-cobalt alloy electroplating process

An alloy electroplating and high corrosion resistance technology, which is applied in the field of high corrosion resistance, bright and soft zinc-cobalt alloy electroplating process, can solve the problems of low current efficiency of the plating solution and difficult control of the plating solution, and achieve good walking position, easy passivation, Wide range of effects

Active Publication Date: 2013-05-22
GUANGZHOU HKS SURFACE TREATMENT CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the research and development of zinc-cobalt alloy electroplating process in China is still in its infancy, and there are only a few zinc-cobalt alloy electroplating processes for the time being, and some baths have low current efficiency, and the bath is not easy to control

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  • High-corrosion-resistance bright soft zinc-cobalt alloy electroplating process

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Embodiment Construction

[0027] Electroplating process condition of the present invention is as shown in the table below:

[0028] name scope Zinc oxide 8~16g / L sodium hydroxide 110~150g / L cobalt sulfate 4~15g / L Triethanolamine 10~20ml / L Molecular condensation products of N,N'-di(dimethylaminopropyl)urea and 2,2'-dichlorodiethyl ether 5~30g / L Sodium Benzylpyridinium Carboxylate 0.05~0.5g / L potassium sodium tartrate 20~50g / L sodium gluconate 10~30g / L Thiourea 0.5~2g / L temperature 20～35℃ current density 1.5~4A / dm 2 current efficiency 65～85% S 阳极 / S 阴极 2:1 Anode material Low-carbon steel to stir Workpiece movement (cathode movement) filter Continuous filtration, use a 10μm filter element, circulate at least 1-2 times per hour, filter paper cannot be used Plating tank Steel channels lined with plastic or rubber ventilation need cool down need

[0029] Table...

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Abstract

The invention belongs to the field of electroplating and particularly relates to a high-corrosion-resistance bright soft zinc-cobalt alloy electroplating process. The electroplating process comprises pre-treatment of surfaces of a workpiece, zinc-cobalt alloy electroplating and post-treatment of the surfaces of the workpiece, wherein pre-treatment of the surfaces of the workpiece comprises: carrying out basic chemical deoiling, washing with water, performing basic anode electrolysis deoiling, washing with water twice, pickling with 30% HCl, washing with water, performing final electrolysis film removal (anode), washing with water, activating with 10% HCl, washing with water and other processes; a basic zinc-cobalt alloy electroplating solution is used during the zinc-cobalt alloy electroplating; and the post-treatment of the surfaces of the workpiece comprises: washing with water twice, brightening with 0.25% nitric acid, washing with water, passivating, washing with water twice, sealing and drying. The electroplating process provided by the invention has the greatest characteristics that: the anti-rust property of the electroplated workpiece is strong, trivalent chromium passivation is combined with a galvanization sealant, white rust does not generate within 240 hours and red rust does not generate within 1000 hours when the electroplated workpiece is placed in neutral salt mist, the electroplated alloy components are uniform, the operating range is wide and the cost is low.

Description

technical field [0001] The invention belongs to the field of electroplating technology, and in particular relates to a highly corrosion-resistant, bright and soft zinc-cobalt alloy electroplating technology. Background technique [0002] Merchants will have certain requirements in terms of corrosion resistance, brightness, and softness when choosing galvanized parts. However, in terms of corrosion resistance, brightness, and softness, the traditional galvanized layer can no longer meet the current requirements for products. requirements. So manufacturers began to study electroplating products such as zinc-based alloys, such as zinc-cobalt alloys, zinc-nickel alloys, zinc-iron alloys, etc. Zeng Xiangde pointed out in the 35th issue of "Painting and Electroplating": "As a protective coating, zinc-cobalt alloy has good corrosion resistance. As far as the steel substrate is concerned, it is an anodic coating and has dual protection of mechanical and electrochemical. Low-cobalt ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/56C25D5/34
Inventor 蒲海丽陀艺芳蓝琳
Owner GUANGZHOU HKS SURFACE TREATMENT CO LTD