Title

Investigation on Dual Corrosion Performance of Magnesium-Rich Primer for Aluminum Alloys Under Salt Spray Test (ASTM B117) and Natural Exposure

Document Type

Article

Publication Date

4-1-2010

Department

Polymers and High Performance Materials

Abstract

Magnesium-rich primers perform very well on outdoor exposure and actual test conditions, yet fail rapidly in accelerated corrosion testing (salt spray test ASTM B117). To investigate the behavioral dichotomy. Mg-rich primers exposed to salt spray testing and natural weathering were characterized at periodic intervals. The results revealed the presence of a thin and porous magnesium hydroxide layer in primers exposed to salt spray, and in natural exposure, a thicker, protective magnesium carbonate layer was detected and characterized. Samples exposed to atmospheric carbon dioxide exhibit excellent corrosion resistance but salt spray conditions are not conducive to facilitate magnesium carbonate formation. (C) 2009 Elsevier Ltd. All rights reserved.

Publication Title

Corrosion Science

Volume

52

Issue

4

First Page

1453

Last Page

1463