Abstract
Zr-Si composite coating with better corrosion resistance and higher surface coverage was formed for advanced high strength steel by γ-Fe2O3@hydroxyapatite (HAP)/CaCO3 activation. At the reaction interface, γ-Fe2O3@HAP/CaCO3 adsorbed on the steel surface could spontaneously immobilize the F− produced by the coating deposition reaction. In this process, as the initial nucleation site of the coating, γ-Fe2O3@HAP/CaCO3 provided large amount of OH− and further accelerated the alkalinization at the reaction interface, which promoted the formation of ZrO2·2H2O and Zr(OH)xFy sol–gel layer. Meanwhile, the γ-Fe2O3@HAP/CaCO3 contained in the coating enabled the Zr-Si composite coating to have self-healing properties.
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