Chitosan inorganic and organic composite passivation film good in film forming

Abstract

The invention discloses a chitosan inorganic and organic composite passivation film good in film forming. The chitosan inorganic and organic composite passivation film good in film forming is prepared by following raw materials including dodecafluoroheptyl methacrylate, hexafluorobutyl methacrylate, a silane coupling agent KH560, azodiisobutyronitrile, a silane coupling agent KH570, a proper number of silane coupling agents KH858, hexadecyl trimethyl ammonium bromide, sodium hydroxide, tetraethoxysilane, trifluoropropylmethyldichlorosilane, chitosan, butanedioic anhydride, gallotannic acid, sodium citrate, tartaric acid, epoxy resin, a curing agent, a proper amount of acetic acid, a proper amount of absolute ethyl alcohol, a proper amount of methyl alcohol, a proper amount of tetrahydrofuran, a proper amount of diluted hydrochloric acid, a proper amount of dilute nitric acid and a proper amount of deionized water. Prepared passivation liquid is low in preparing cost, free of toxicity and harm, green, environment-friendly and capable of forming the compact passivation film on the surfaces of a zinc plated wide plate, an aluminum profile and the like, corrosion of a base material can be retarded, the service life is prolonged, and various later machining properties of the base material are not influenced.

Description

technical field [0001] The invention relates to the technical field of chromium-free passivation, in particular to a chitosan inorganic-organic composite passivation film with good film formation. Background technique [0002] Galvanized wide-band steel plate refers to a steel plate coated with a layer of zinc on the surface. Galvanizing is to prevent corrosion on the surface of the steel plate and prolong the service life of the steel plate. Galvanized wide-band steel plate is becoming more and more closely related to people’s lives. Use color-coated panels and car benches. Because zinc is very active, it is easily corroded by acids, alkalis, oxygen, carbon dioxide and water vapor in the atmosphere, so it needs to be passivated. The traditional passivation method of galvanized sheet generally adopts passivation containing chromate. This method has the advantages of excellent film-forming performance, low cost and simple process, but the chromium ions contained in the chrom...

AI Technical Summary

Problems solved by technology

The chromium-free passivation solution provided by the author can fundamentally solve the problem of toxic and harmful chromium ions poisoning people in the existing passivation solution, and can also truly replace the chromium-containing passivation solution to realize the conversion of electro-galvanized wide-band steel sheets. However, the plating film formed by this chromium-free passivation solution still cannot meet the market demand in terms of low friction, anti-oxidation, corrosion resistance, self-lubrication, wear resistance, etc., and further modification is needed to improve the application field and expand the application prospect