Reparation and Performance Testing of Free Radical Photocurable Passivation Film Modified by Titanate Coupling Agent for Hot-plated Aluminum-zinc Steel Plate

Abstract

To study the effect of free radical photocurable passivation film modified by titanate coupling agent for hot-plated aluminum-zinc plate, trimethylpropane triacrylate (TMPTA) and 2-phenoxyethyl acrylate were used as active diluents, a mixture of modified epoxy acrylate and modified polyester acrylate in a certain proportion was used as an oligomer, 2-methyl-1-[4-(methylothyl) benzene] -2-morpholine acetone (907) was used as a free radical photoinitiator, isopropyl thioxanthone (ITX) was used as sensitizer, and bis (dioctyl phosphate acyl) titanate ethyltitanate acrylamide chelate (FD-812) was used as corrosion inhibitor modifier. After UV-curing, the passivation film was characterized by neutral salt spray test, electrochemical testing and other methods. The general performance of the passivation film may meet the requirements of downstream users of hot aluminum-zinc steel plate. The neutral salt spray test, electrochemical testing and microscopic surface morphology analysis of passivation film are in agreement. The introduction of titanate components may effectively promote the photocuring of free radicals. There have been few reports on the titanate coupling which is added to UV-curing coating formula. The titanate coupling agent contains acrylamide groups and terminal amine groups, acrylamide group has oligomer and crosslinking monomer, the terminal tertiary amine groups can provide hydrogen protons, reduce oxygen polymerization, and a phosphating film is formed on the surface of the metal substrate to improve the adhesion and corrosion resistance of the coating.

Keywords

cationic photocuring / hot galvalume steel plate / surface treatment / titanate coupling agent / chromium-free environmental passivation film

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