Corrosion resistance of a superhydrophobic calcium carbonate coating on magnesium alloy by ultrasonic cavitation-assisted chemical conversion. (February 2023)

• Record Type: Journal Article
• Authors: Wang, Ye; You, Zhipeng; Ma, Kai; Dai, Chaoneng; Wang, Danqian; Wang, Jingfeng
• Is Part Of: Corrosion science. Volume 211(2023)
• Publication Date: 2023-02
• Subjects: Magnesium alloy formwork -- Calcium carbonate -- Ultrasound-assisted chemical conversion -- Corrosion -- Surface; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2022.110841
• Languages: English
• ISSNs: 0010-938X

Abstract

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 . Highlights: A superhydrophobic CaCO3 coating via ultrasound treatment on Mg alloy was prepared. A compacted CaCO3 + (Mg, Ca)CO3 dual layer with a thickness of ∼4 µm. (Mg, Ca)CO3 inner layer plays an important role in the anticorrosion. Durian peel-like CaCO3 surface contributes to the superhydrophilicity. The UMg coating shows good corrosion resistance and self-healing property.