Chemical deplating solution and deplating method suitable for removing tin-nickel coating on surface of brass

Abstract

The invention discloses a deplating solution and a deplating method thereof for tin-nickel coating (commonly called plated scrap) on the surface of brass. The deplating solution comprises oxidizer, accelerator, complexing agent and inhibitor, and the deplating solution is prepared by adding water to the reagents, stirring, dissolving, then putting in a water bath and slowly heating. The oxidizer adopts 65-68% nitric acid, the accelerator adopts 36-38% hydrochloric acid, the complexing agent adopts citric acid and the inhibitor adopts benzotriazole. After being deplated by the deplating solution of the invention, the surface of the brass is bright, the color of the substrate is basically unchanged, and the brass has no pinholes and small corrosion amount.

Description

technical field

[0001] The invention relates to a deplating solution and a deplating method thereof, in particular to a chemical deplating solution and a deplating method suitable for stripping the tin-nickel coating on the surface of brass. Background technique

[0002] The recycling and utilization of scraps of copper and copper alloy products with tin-nickel plating on the surface have received great attention in countries all over the world. In order to recycle defective or waste products with metallization on the surface, it is necessary to remove the metal composite coating, that is, deplating. Regarding the deplating process of the coating, chemical or electrochemical stripping methods can be used. Electrochemical stripping solution has simple composition, weak corrosion to the substrate, and can be recycled for some metals, which is beneficial to environmental protection, but it needs to provide power supply and stripping tank, and sometimes special hangers are requ...