Preparation method of hot dip galvanized sheet anti-corrosive treatment agent of environmental protective

摘要

A coating composition is provided, the starting materials of which comprise nano SiO2, film-forming substance, film-forming aid, accelerator, acid, and water. The composition has pH of 3-9. A passivated zinc-plated material is also provided. The zinc-plated material comprises zinc-plated substrate and passivated coat adhered to the surface of the zinc-plated substrate, wherein the passivated coat is formed by curing the coating composition. The coating composition can impart to the zinc-plated material excellent corrosion resistance, water resistance, high temperature resistance, surface conductivity, and adhesion to the zinc-plated substrate. Additionally, the coating composition contains no Cr6+, and satisfies the requirement of EU RoHS Directive.

主权项

1. A coating composition, characterized in that the starting materials of the
coating composition consists of nano SiO2, film-forming substance, film-forming aid, accelerator, acid, and water, and the coating composition has pH of 3-9, the film-forming substance is one or more selected from (meth)acrylic acid resin, epoxy resin, styrene-acrylate emulsion, silicone-acrylate emulsion, and polyurethane resin, each with weight average molecular weight of 8,000-200,000; the film-forming aid is one or more selected from silane coupling agent, triethylamine and tetraethyl orthosilicate; the accelerator is one or more selected from sodium silicate, sodium fluoride, sodium pyrophosphate, sodium phosphate, acetone, ethylene glycol, ethanol, and triethyl phosphate; and the acid is phosphoric acid and/or phytic acid.