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Corrosion behavior of 2099 Al–Li alloy in NaCl aqueous solution

Published online by Cambridge University Press:  24 June 2014

Bin Chen ,
Chao-Hao Li ,
Shi-Chen He ,
Xiao-ling Li  and
Chen Lu
Bin Chen*
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Chao-Hao Li
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Shi-Chen He
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Xiao-ling Li
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Chen Lu
Affiliation:
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The corrosion behavior of 2099 Al–Li alloy in NaCl aqueous solutions with different concentrations (1.5, 3.5, and 5.0% in mass fraction) was investigated. Its corrosion resistance was evaluated using electrochemical measurements together with full immersion tests. The results showed that the 2099 Al–Li alloy possessed good corrosion resistance in NaCl aqueous solutions. Its corrosion rate increased with increasing chloride ion concentration. The main form of corrosion failure was pitting corrosion. The impurity containing sulfur leads to surface pitting. The oxide films that formed during the manufacturing process offer a good resistance to corrosion. They are likely to suffer separation, cracking, and drop-off when immersed in aggressive NaCl aqueous solution. The good corrosion susceptibility of the alloy may be attributed to homogeneous coherent nanoscale precipitates.

Keywords

AlalloycorrosionNaCl aqueous solutionelectrochemical measurementimmersion test
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 12 , 28 June 2014 , pp. 1344 - 1353
Copyright
Copyright © Materials Research Society 2014 

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