Corrosion resistance of AZ31B magnesium alloy with a conversion coating produced from a choline chloride—Urea based deep eutectic solvent. (May 2016)

• Record Type: Journal Article
• Authors: Gu, C.D.; Yan, W.; Zhang, J.L.; Tu, J.P.
• Is Part Of: Corrosion science. Volume 106(2016)
• Page Start: 108
• Page End: 116
• Publication Date: 2016-05
• Subjects: Magnesium alloy -- Deep eutectic solvent -- Corrosion -- Conversion coating -- MgH2 -- Superhydrophobicity; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2016.01.030
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: A conversion coating on Mg alloy by interaction of ionic liquid with substrate. The chemical conversion film is composed by MgH2 and MgCO3 . The conversion film shows superhydrophobic after modified by stearic acid solution. The ionic liquid is a choline chloride—urea based deep eutectic solvent. Improved corrosion resistance of AZ31B Mg alloy with hydrophobic conversion film Abstract: A novel ionothermal strategy for developing a chemical conversion film on magnesium alloys is proposed based on the interaction of a deep eutectic solvent (DES) with the substrate. Upon heating the choline chloride/urea mixture-based DES can react with the AZ31B magnesium alloy surface to form a promising anti-corrosion conversion film. Interestingly, the chemical conversion film is mainly composed by MgH2 and MgCO3 phases. The as-grown conversion film exhibits superhydrophobicity after surface modification in a stearic acid/ethanol solution. Electrochemical tests and visual investigations indicate the corrosion resistance of the magnesium alloy can be improved by the conversion film.