Stainless steel blackening agent and blackening method

Abstract

The invention belongs to the technical field of surface treatment and relates to a stainless steel blackening agent, which contains aqueous solution which is formed by dissolving sodium hydroxide, sodium nitrate and sodium molybdate in deionized water, the content of the sodium hydroxide is 400-540g / L, the content of the sodium nitrate is 28.5-114g / L, and the content of the sodium molybdate is 5.7-57g / L. The invention also provides a blackening method for stainless steel, which comprises the following step: a stainless steel work piece is put into the stainless steel blackening agent to be oxidized and blackened, and the stainless steel blackening agent is the stainless steel blackening agent in any of claims 1-4. The stainless steel blackening agent and the blackening method are applicable to the fields of electronic industry, kitchen utensils, household appliances, instruments and meters, automotive industry, chemical equipment and the like.

Description

technical field

[0001] The invention relates to a stainless steel blackening agent and a blackening method. Background technique

[0002] Black stainless steel is widely used in the field of construction and decoration materials. With the continuous improvement of people's needs, industries such as electronics industry, kitchen utensils, household appliances, instruments and meters, automobile industry, chemical equipment, sign printing and aerospace military industry can no longer be satisfied with the use of primary color stainless steel, and have begun to use black stainless steel. Therefore, stainless steel oxidation blackening as a stainless steel coloring technology began to receive people's attention.

[0003] Potassium dichromate and sulfuric acid are commonly used as blackening agents for stainless steel in the prior art. The blackening agent contains potassium dichromate, which pollutes the environment. and other defects. Contents of the invention

[0004] The...

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