Environment-friendly chemical nickel stripper and deplating method thereof

Abstract

The invention discloses an environment-friendly chemical nickel stripper and a deplating method thereof. Preferably, m-nitrobenzoic acid serves as an oxidizing agent for stripping a nickel-plated layer on an iron substrate; and since nitrate is generally stable in nature and low in toxicity, no waste gas or waste water is generated when the stripper provided by the invention is used, and the stripper does not corrode devices and has high affinity with the environment. Meanwhile, the stripper is further matched with diethyl dithiocarbamate and dodecyl sulfonate and combined with the deplating method thereof, the rate of stripping the nickel-plated layer on the iron substrate can be effectively increased, the nickel-plated layer can be stripped in a short time, and the production period is shortened. Compared with the prior art, the environment-friendly chemical nickel striper and the deplating method thereof have the advantages of being free of corrosion, poison gas and pollution, high in efficiency, environmentally friendly, easy and convenient to maintain and operate and the like.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to an environment-friendly chemical nickel stripping agent for iron substrates. Background technique [0002] Unqualified coatings will be produced during the electroplating process, and coatings will also be deposited on the racks supporting the plated parts; the former needs to be recycled, and the latter needs to be used repeatedly, so the coating needs to be completely removed. In the prior art, there are two deplating methods for iron-based chemical nickel deplating: cyanide method and acidic deplating method. Among them, the cyanide method uses sodium cyanide or potassium cyanide as a complexing agent, anti-staining salt S (sodium m-nitrobenzene sulfonate) as the main salt for deplating, and then adds some other auxiliary salts, mainly for corrosion inhibition. agents and accelerators etc. Because this method requires the use of higher levels of cyanide and sodium m-n...

AI Technical Summary

Problems solved by technology

Because this method requires the use of higher levels of cyanide and sodium m-nitrobenzenesulfonate, the following problems may occur during use: (1) cyanide is highly toxic, if workers’ safety protection is not in place or during operation If you are not careful, it is easy to cause personal injury and seriously threaten the personal safety of the staff; (2) the derivatives of nitrobenzene are toxic and difficult to degrade, which will cause great harm to the staff's body and the natural environment, and do not meet the safety and environmental protection requirements; (3) Wastewater treatment is difficult. Wastewater containing cyanide or nitrobenzene derivatives needs to be recycled and treated by professional companies, which increases the cost of the factory

[0003] In response to the country's advocacy of environmentally friendly production and safe production, it is required to prohibit the use of anti-staining salt in the production process. The traditional stripping method can no longer meet the requirements of the current production environment.

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