Degradation of the Mechanical Strength of Al Alloys by Electrochemically Introduced Hydrogen

The high strength Al alloys, 7N01, 6061 and 5083, were examined using slow strain rate testing in chloride-containing acid to neutral solutions under potentiostatic control. Large amounts of hydrogen absorption occurred at potentials above the breakdown potential. In this potential range, the mechan...

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Bibliographic Details
Published inECS transactions Vol. 3; no. 31; pp. 185 - 190
Main Authors Fujimoto, Shinji, Kouno, Takashi, Tsuji, Tomohide, Haruna, Takumi
Format Journal Article
LanguageEnglish
Published 28.09.2007
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Summary:The high strength Al alloys, 7N01, 6061 and 5083, were examined using slow strain rate testing in chloride-containing acid to neutral solutions under potentiostatic control. Large amounts of hydrogen absorption occurred at potentials above the breakdown potential. In this potential range, the mechanical strength of the alloys is degraded manly by severe general corrosion but hydrogen embrittlement may also occur. On the other hand, polarisation at more negative potentials where there is intense hydrogen evolution does not necessarily lead to a large amount of hydrogen entry except for the case of the alloy 5083, which suffered from hydrogen embrittlement induced by hydride formation around precipitates.
ISSN:1938-5862
1938-6737
DOI:10.1149/1.2789226