Surface conditioner containing zinc phosphate, phosphate chemical conversion treatment steelboard, coating steelboard and zinc phosphate dispersion liquid

Abstract

A zinc phosphate-containing surface conditioning agent to be used for surface conditioning as pretreatment for zinc phosphate conversion coating of a metallic material, which contains from 500 to 20,000 ppm of zinc phosphate and which has a pH of from 3 to 11, wherein said zinc phosphate has an average particle size of at most 3 mu m and D90 of at most 4 mum.

Description

technical field

[0001] The present invention relates to a surface regulator, which is used for the pretreatment of zinc phosphate chemical conversion treatment on metal materials. Background technique

[0002] Automobile bodies, home appliances, etc. are generally processed into metal moldings from metal materials such as steel sheets and galvanized steel sheets, and then painted and assembled to form products. The coating of such metal moldings goes through various processes such as degreasing, surface adjustment, chemical conversion treatment, and electroplating.

[0003] The purpose of performing the surface conditioning treatment is to uniformly, rapidly and densely form a film of phosphate crystals on the entire surface of the metal in the phosphate chemical conversion treatment that is the next step. Usually, the metal material is immersed in a surface conditioning tank to form phosphate crystal nuclei on the metal surface. This surface adjustment process generally f...