Article ID Journal Published Year Pages File Type
1472162 Corrosion Science 2007 10 Pages PDF
Abstract

The influences of surface films formed by open-circuit exposure to neutral solutions on the corrosion and electrochemical behaviour of pure Mg and Mg alloys have been examined by in situ ellipsometric analysis and electrochemical measurements. Surface films mainly composed of Mg(OH)2 grew rapidly during open-circuit exposure to 0.1 M NaCl and 0.1 M Na2SO4 solutions. These films had protective ability to passivate Mg in the solutions. However, they suffered local breakdown under anodic polarisation. The passive current density decreased and the breakdown potential increased with increasing immersion time and film thickness. Influences of purity and alloying elements on the passivity and its breakdown of Mg have been discussed.

Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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