Abstract
A superhydrophobic anticorrosive CaCO3 coating was prepared on Mg-Nd alloy by ultrasound-assisted chemical conversion. Results show that the prepared coating consists of an outer durian-peel like CaCO3 layer and a compact inner (Ca, Mg)CO3 layer. Ultrasound treatment enhances the homogeneity and decreases the size of CaCO3 particles in coating, which contributes to its superhydrophobicity. This results in an enhanced anticorrosive property of coating via ultrasonic treatment. Ultrasound possibly accelerates the nucleation of CaCO3 crystals and assists the removal of hydrogen bubbles. A self-healing property of ultrasonically prepared coating was also obtained due to the formation of vaterite and Ca3(OH)2(CO3)2.
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