Stainless steel pickling passivator and preparation method thereof

Abstract

The invention discloses a stainless steel pickling passivator and a preparation method thereof. The stainless steel pickling passivator comprises citric acid, hydrochloric acid, formic acid, fatty alcohol-polyoxyethylene ether, polyethyleneimine, epoxy octyl stearate, thiosemicarbazide, epoxy chloropropane, hydrogen peroxide, a penetrating agent, a corrosion inhibitor, a thickening agent, an inorganic filler and a viscosity modifier. The preparation method comprises the steps of firstly adding part of raw materials such as the fatty alcohol-polyoxyethylene ether and the like into the hydrochloric acid sequentially, and uniformly stirring the raw materials to obtain a mixed solution I; then sequentially adding part of the raw materials such as the hydrogen peroxide into mixed acid liquor of the citric acid and the formic acid, and uniformly stirring the raw materials to obtain a mixed solution II; then mixing the mixed solution I and the mixed solution II, and adding the inorganic filler into the mixture; and finally adding the penetrating agent, the corrosion inhibitor, the thickening agent and the viscosity modifier sequentially into the mixture, and uniformly mixing the mixture to obtain the finished product. According to the stainless steel pickling passivator and the preparation method thereof, the stainless steel pickling passivator is good in passivation effect, not prone to damage the surface of stainless steel, environment-friendly and simple to prepare and does not cause harm to human bodies and environment.

Description

technical field [0001] The invention relates to the technical field of passivating agents, in particular to a stainless steel pickling passivating agent and a preparation method thereof. Background technique [0002] During the processing of stainless steel, it will cause surface defects, hidden dangers of corrosion, black scale and other metal compounds, yellow welds and grease during cold drawing, etc. In order to improve the appearance and corrosion resistance of stainless steel, the processed stainless steel must be acidified Wash passivation treatment. Make the treated surface form a passivation film with chromium as the main substance, prevent it from reacting with other substances, achieve the purpose of passivation, make it bright and white, improve the surface anti-corrosion quality of stainless steel products, and prolong the service life of equipment. Stainless steel pickling is generally treated with pickling passivation paste and pickling passivation solution. ...

AI Technical Summary

Problems solved by technology

[0003] At present, the stainless steel pickling passivation paste / liquid has the following main problems: 1) The current stainless steel pickling passivation paste / liquid has a strong pungent smell, accompanied by yellow smoke, and is easy to burn human skin and osteoporosis, etc. , which is not conducive to environmental protection and health; 2) The current pickling passivation paste / liquid products use a large number of strong acid raw materials such as hydrofluoric acid, nitric acid, sulfuric acid and sodium alkylbenzene sulfonate and are rich in harmful elements. The long-term use of the paste / liquid will cause damage to the surface of the stainless steel, and in the future under the conditions of light, high temperature, high pressure, high-flux radiation, extreme low temperature stress alternating, etc., they will cause pitting corrosion and needle corrosion on the stainless steel parts. corrosion, intergranular corrosion, transgranular corrosion, etc.

However, nitric acid and hydrofluoric acid are extremely strong acids, which will cause damage to the surface of stainless steel