The corrosion of pure Mg accelerated by haze pollutant ammonium sulphate. (15th April 2019)

• Record Type: Journal Article
• Authors: Cao, Fuyong; Zhao, Chen; Song, Guang-Ling; Zheng, Dajiang
• Is Part Of: Corrosion science. Volume 150(2019)
• Page Start: 161
• Page End: 174
• Publication Date: 2019-04-15
• Subjects: A. Magnesium -- A. Ammonium -- B. Polarization -- B. Potentiostatic -- C. Alkaline corrosion; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2019.01.042
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: The corrosion of Mg is accelerated by NH4 + addition in an alkaline solution. This corrosion acceleration effect disappears under an acidic condition. NH4 + kinetically accelerates the dissolution of the thin protective inner MgO layer in the corrosion product film. Abstract: The corrosion behavior of pure Mg in NH4 + -containing alkaline solutions was studied by immersion test, electrochemical methods, morphology observation and corrosion product analysis. The results showed that the corrosion of Mg was dramatically accelerated by NH4 +, resulting in a thick and loose Mg(OH)2 corrosion product film formed in the NH4 + containing alkaline solutions. It was proposed that the NH4 + could dissolve the relatively protective MgO layer in the corrosion product film, providing a path for the solution to reach the substrate and facilitating the corrosion of Mg.