The polarisation and repassivation behaviour of the aluminium-zinc-magnesium-copper alloy 7010

The polarisation behaviour and repassivation kinetics of two heat treatments (T651 and T73651) of the aluminium alloy 7010 were investigated in solutions of 0.6 M NaCl, 0.34 M NaCl + 0.003 M Na 2CrO 4 (pH = 3) and 0.34 M NaCl (pH = 3). Current-time curves representing repassivation were measured for...

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Bibliographic Details
Published in:Corrosion science 1994-06, Vol.36 (6), p.941-956
Main Authors: Raetzer-Scheibe, H.J., Tuck, C.D.S.
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion mechanisms
Exact sciences and technology
Metals. Metallurgy
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Summary:The polarisation behaviour and repassivation kinetics of two heat treatments (T651 and T73651) of the aluminium alloy 7010 were investigated in solutions of 0.6 M NaCl, 0.34 M NaCl + 0.003 M Na 2CrO 4 (pH = 3) and 0.34 M NaCl (pH = 3). Current-time curves representing repassivation were measured for various potentials after mechanically generating fresh metal surface by means of a microtome with a corundum blade. In the chromate solution, a strong inhibiting effect was found. The determination of critical repassivation potentials by this method enabled a comparison to be made between pitting potentials and repassivation potentials determined by conventional potentiodynamic means. The potentiodynamic polarisation was carried out at 150, 75 and 1 mV min −1 scan rates and the best agreement between measured repassivation potentials of oxide-free aluminium and repassivation potential values of conventionally prepared material was obtained by using a 150 mV min −1 scan rate.
ISSN:0010-938X
1879-0496
DOI:10.1016/0010-938X(94)90196-1