High-adhesion selenium-free normal temperature blackening liquid

Abstract

The invention relates to a high-adhesion selenium-free normal temperature blackening liquid, and belongs to the technical field of steel treatment. First of all, an effective component which has a specific chelation effect on iron ions is extracted from a Chinese medicine, and used for chelating and shielding ferrous ions replaced from the surface of steel so as to avoid the ferrous ions to hinder copper plating on the surface of the steel; and then a soy saponine extracting solution is utilized to wash the surface of the steel so as to improve the wettability of the surface of the steel, in this way, liquid is easy to wet and be spread on the surface of the steel, so that forming of even blackening films is facilitated; and finally Arabidopsis thaliana and an egg yolk fermentation material are utilized to supply the elements of nitrogen, sulfur and phosphorus, a layer of chemical protection film is formed through reoxidation on a copper oxide layer of the surface of the steel and used for filling holes between the blackening films, so that the glossiness of the blackening films is enhanced; and meanwhile, combination between the blackening films and a steel substrate can further be firmer, and the adhesion performance of the blackening films is improved. The prepared blackening liquid has the characteristics of being even in film layer, the blackening films are good in glossiness, adhesion and corrosion resistance, the component is nontoxic and environmentally friendly, and the application prospects are wide.

Description

technical field [0001] The invention relates to a selenium-free room-temperature blackening solution with high adhesion and belongs to the technical field of iron and steel treatment. Background technique [0002] Blackening is a kind of surface finishing technology, which is widely used in the surface processing of steel items such as optical instruments, weapons, and standard parts, and has both antirust and decorative effects. The working temperature of the traditional blackening bath is above 130 ℃, which leads to high energy consumption and poor working conditions. Compared with alkaline high-temperature oxidation, normal temperature blackening operates at normal temperature, which saves electricity and energy and improves the working environment. At present, most of the practical blackening solutions at room temperature contain selenides. The copper-selenium room temperature blackening system undergoes a series of chemical reactions to finally generate black copper se...

AI Technical Summary

Problems solved by technology

[0003] The technical problem mainly solved by the present invention is that the conventional blackening liquid at room temperature is a copper-selenium blackening system, and the resulting blackening film is loose and has low adhesion, and more precipitates are formed during the blackening process, and the working liquid contains toxic substances. Selenium element, the waste liquid and waste residue produced will be harmful to the human body and the environment, providing a high-adhesion selenium-free room temperature blackening liquid