Stainless steel pickling passivation agent and production method thereof

Abstract

The invention relates to surface treatment of a stainless steel material, in particular to a stainless steel pickling passivation agent and a production method thereof. The stainless steel pickling passivation agent comprises the following components by weight percent: 6-15% of nitric acid, 12-20% of phosphoric acid, 5-10% of hydrogen peroxide, 5-52% of magnesium phosphate and 15-20% of zinc nitrate. The production method of the stainless steel pickling passivation agent comprises the following steps: (1) screening raw materials, and analyzing the raw materials to control the contents of harmful elements fluorine, chlorine, sulfur and sodium below 500ppm before the raw materials are used; (2) sequentially mixing the three raw materials nitric acid, phosphoric acid and hydrogen peroxide in a polyethylene container according to the mixture ratio, and then carrying out the macroporous ion resin adsorption to implement the harmful element removal treatment; (3) weighing the magnesium phosphate and zinc nitrate according to the mixture ratio, and then respectively rinsing with distilled water and dialyzing with a bianodic film to carry out the harmful element removal treatment; and (4) evenly mixing and stirring the qualified raw materials removing the harmful elements into a paste so as to obtain the finished product. The safe and efficient effects can be obtained when the stainless steel pickling passivation agent is used.

Description

technical field [0001] The invention relates to surface treatment of stainless steel materials, in particular to a pickling passivator for stainless steel and a production method thereof. Background technique [0002] The oxide layer on the surface of stainless steel is extremely hard, and it is more difficult to remove than the oxide layer on the surface of general steel. This oxide layer has many harms, such as affecting the appearance, reducing the corrosion resistance of the material, and hindering future processing. [0003] At present, various stainless steel pickling passivation pastes and pickling passivation solutions have been developed at home and abroad, and these things are used to remove the oxide skin layer on the surface of stainless steel at room temperature and form a passivation protective film. reagents. [0004] But the existing problem is that pickling passivation cream and pickling passivation solution products use a large amount of raw materials suc...

AI Technical Summary

Problems solved by technology

[0004] But the existing problem is that pickling passivation cream and pickling passivation liquid products use a large amount of raw materials such as hydrofluoric acid, sulfuric acid, hydrochloric acid, sodium alkylbenzene sulfonate, sodium chloride, etc., and these raw materials all contain very rich Fluorine, chlorine, sulfur, sodium and other elements, these elements can cause harm to stainless steel, and hide many murderous opportunities! It remains on the working surface due to unclean rinsing, or infiltrates into the residue. In the future, under the occasions of light, high temperature, high pressure, high-flux radiation, and extreme low temperature stress alternating, they will cause pitting corrosion and needle corrosion of stainless steel parts. corrosion, grain boundary corrosion, through-grain corrosion, etc.