Application of organosilicon in coatings-chromium substitute
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Metal surfaces can also be chromated. It is a process in which a chromate solution is used to interact with a metal to form a trivalent or hexavalent chromate layer on its surface. It is mostly used for the treatment of aluminum, magnesium and its alloys; it can also form a chromate layer on steel, but rarely alone. use. Because chromium is polluting the environment, people are looking for alternatives to chromium. It was discovered in 1983 that after the metal surface is coated with a primer consisting of acrylic copolymer, epoxy resin, silica sol and trialkoxysilane, it can provide excellent paintability, degreasing and corrosion resistance; after 20 years, It has been found that wash-resistant primers that do not contain acrylic copolymers or epoxy resins provide similar performance.
