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Intergranular corrosion testing of 6000 aluminum alloys
Author(s) -
Cornejo Marina,
Hentschel Thomas,
Koschel Diana,
Matthies Christiane,
Peguet Lionel,
Rosefort Marcel,
Schnatterer Christian,
Szala Elizabeth,
Zander Daniela
Publication year - 2018
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201709813
Subject(s) - materials science , intergranular corrosion , alloy , corrosion , aluminium , reproducibility , metallurgy , chemistry , chromatography
The ISO 11846 Method B is one of the most frequently used corrosion tests to investigate the intergranular corrosion susceptibility of Al‐Mg‐Si(‐Cu) alloys and involves the sample immersion in an aqueous solution containing 30 g/L NaCl and 10 ml/L concentrated HCl for 24 h. Unfortunately, the standard allows for a broad range of parameter variation, for instance the temperature of the test solution and the volume‐to‐surface‐ratio of the solution related to the sample surface area, which causes insufficient reproducibility and reliability of this test method. In the present study, the influence of testing parameter variations within the scope of ISO 11846 Method B on the test results of an almost Cu‐free and a Cu‐containing variant of the 6016 aluminum alloy, both tested in the T4 condition and after a bake‐hardening treatment, was studied in detail. The results show that particularly the volume‐to‐surface‐ratio as well as the surface preparation and the solution temperature significantly influence the test results.