Galvanizing rustproof treatment process for steel surface

Abstract

The invention discloses a galvanizing rustproof treatment process for steel surface, and belongs to the field of hot galvanized steel plates. The galvanizing rustproof treatment process comprises thesteps of 1, removing oil stains on the surface of steel; 2, carrying out first washing; 3, pickling; 4, carrying out secondary washing; 5, carrying out phosphating, specifically, the steel cleaned inthe step 4 is firstly subjected to galvanizing treatment and then is placed in galvanizing liquid of 450-470 DEG C for galvanizing for 2-3 minutes by adopting a hot galvanizing treatment process, after being subjected to galvanizing treatment, the steel is subjected to pre-treatment by using 2%-4% oxalic acid liquid and then is dipped with a phosphating solution by adopting an injection method right after being saturated with the oxalic acid liquid so that a phosphating film is formed, an accelerant is added in the phosphating solution, and after the phosphating film is formed, the steel is dried immediately under the high temperature of 130-150 DEG C; and 6, carrying out passivation treatment. According to the galvanizing rustproof treatment process for the steel surface, the steel surface is treated on the basis without changing internal structural components of the steel, anti-corrosion capability of the steel is improved, and the purpose of rustproofing can be achieved.

Description

technical field [0001] The invention belongs to the field of hot-dip galvanized steel sheets, and in particular relates to a galvanized and anti-rust treatment process for steel surfaces. Background technique [0002] my country has always been a big country for steel production and steel use. Most of my country's steel production is in the Northeast region. It is well known that the current environment has serious pollutants, accompanied by moisture and dirty substances in the air, because the surface of steel is extremely easy to rust. [0003] In the past technology, people mainly carried out the surface treatment of steel, such as applying corrosion-resistant paint on the surface of steel or changing the composition of the steel structure to change the composition of the steel, but what we need to understand is that if the composition of the steel If there is a change, it will first change the hardness of the plate, which will limit the scope of use of the steel plate. ...

AI Technical Summary

Problems solved by technology

[0004] Therefore, although changing the internal composition of steel can gr