Author： Skoulikidis Th. Karageorgos Ath.
Publisher： Maney Publishing
ISSN： 0007-0599
Source： British Corrosion Journal, Vol.10, Iss.1, 1975-01, pp. : 17-22
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Abstract
With the object of protecting aluminium alloys against stress corrosion cracking in saline water, anodic γ1−, γ2−A12O3 and γl−, γ2−Al2O3.3H2O films were formed on aluminium−2·5 wt-% magnesium alloy specimens. The influence of anodising current density, film thickness and, above all, grain orientation relative to the subsequent loading direction, and also that of oxide ageing between oxidation and sealing, was studied. The specimens were tested under accelerated laboratory stress corrosion conditions, including the corrosive environment (1 M NaCl solution), circulation conditions and impressed anodic current. For each category of specimen, tensile stress vs specimen life (time to cracking) curves were established. Results obtained with this procedure showed that the conditions of formation of the oxides and their hydrates, and particularly the orientation of the grains, have a considerable influence on their protective properties and mechanical strength; some of these oxide or hydrate coatings were thus found to give protection against stress corrosion cracking in saline water to the aluminium alloy studied. Some recommendations about the choice of the test conditions are discussed.
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