Iron substrate plating neutral stripping agent

Abstract

The invention discloses an iron substrate plating neutral stripping agent. Nitrate is optimally selected as an oxidizing agent for stripping nickel, chromium, copper, tin and other plating on an iron substrate, and as generally, nitrate is relatively stable in property and relatively low in toxicity, so that when the stripping agent provided by the invention is used, exhaust gases and waste water are not generated, and the stripping agent is non-corrosive to a device and highly friendly to the environment; at the same time nitrate is matched with citrate, potassium sodium tartrate and a proper amount of polyhydroxyl aldehyde, so that the speed for stripping the nickel plating on the iron substrate is effectively increased, the plating stripping is achieved in a short time, and the production cycle is shortened while the substrate is not damaged; and particularly, calcium nitrate is optimally as the oxidizing agent, and ammonium ferric citrate is adopted as a first complexing agent, and calcium nitrate and ammonium ferric citrate are combined with mannitol and sodium diacetate, so that the stripping rate of the nickel plating on the iron substrate can be effectively increased. Relative to the prior art, the stripping agent has the advantages of being free of corrosion, poisonous gases and pollution, high in efficiency, environment-friendly in use, easy and convenient to maintain, and the like.

Description

Technical field [0001] The invention relates to a coating stripper, in particular to a neutral stripper for iron matrix coating. Background technique [0002] Since the country implemented economic reform and opening up in 1978, my country's economy has undergone earth-shaking changes and has achieved remarkable results. However, economic development is accompanied by serious environmental pollution, and the electroplating industry has also become a key target of governance. [0003] In the field of electroplating technology, a hanger is generally used to fix the product and immerse it in the plating solution to complete the electroplating process. The main body of the rack is generally made of metal such as iron and stainless steel. During electroplating, the current is discharged at the hook tip of the rack and the electroplated product to deposit nickel, chromium, copper, tin, zinc and other plating layers. The electroplating layer affects the conductivity of the hook and the e...

AI Technical Summary

Problems solved by technology

The latter uses strong corrosive agents such as nitric acid to peel off the coating, which is likely to produce a large amount of exhaust gas to pollute the air, cause acid rain, and is easy to corrode the hook, which will damage the hanger and shorten the service life.

And the reagents such as decoupling water used in large quantities are also likely to cause serious environmental pollution and high electrolysis energy consumption.

Cyanide is a highly toxic substance, and it is difficult to treat it harmlessly.

Especially for the nickel, chromium, copper, zinc and tin coatings on the surface of the iron substrate hanger, it is often difficult to completely peel off by using the existing technology, and the surface of the iron substrate is rough after stripping.