Heat resistant paint for iron and steel

Abstract

The present invention relates to a kind of anti-high temperature iron and steel surface scale coating, which is mainly composed of the following raw materials in parts by weight: 20-25 parts of ethyl borate, 15-25 parts of organic silicon resin, 5%-10% of polyvinyl butyrate Aldehyde (solvent is isopropanol) 5-10 parts, aluminum powder 15-20 parts, solvent 10-20 parts, dispersant 1-2 parts. The coating of the present invention combines the three most characteristic materials in high temperature resistance of boron oxide, organic silicon and aluminum oxide layer, and has three different protection mechanisms of reaction type protection, melt film shielding type protection and redox type protection respectively. Compared with the blank sample that has not been sprayed, the amount of oxide skin on the surface of the steel billet is reduced to about 90%, while the paint with the same effect used by other units is about 65%, which is a full 25% higher.

Description

technical field [0001] The invention relates to an anti-high temperature steel surface oxide skin coating. Used for protection of steel before heat treatment. It belongs to the technical field of paint. Background technique [0002] Usually, the steel surface will be accompanied by dust, oil, scale, rust layer, pollutant salt, or loose old paint film. Among them, scale is the most common but most easily overlooked part. Oxide scale is a layer of dense oxide layer produced when steel is forged and pressed at high temperature. It usually adheres relatively firmly, but it is brittle compared to steel itself. From the electrochemical analysis, the electrode potential of the oxide scale is 0.15-0.20V higher than that of iron. In the corrosive medium, iron corrodes before the oxide scale, especially when there is a large amount of oxide scale, a large amount of oxide scale is the cathode, and a small amount of oxide scale is the cathode. The exposed iron becomes a small anode, ...

AI Technical Summary

Problems solved by technology

Usually, the oxide scale must be completely removed before the steel surface is painted, and many steel surface coatings are carried out before the oxide scale is completely removed, resulting in poor coating quality and greatly shortened coating life.