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The measurement of electrostrictive stresses in anodic barrier layers on aluminium by means of a membrane method

✍ Scribed by N. Wüthrich

Publisher
Elsevier Science
Year
1980
Tongue
English
Weight
640 KB
Volume
25
Category
Article
ISSN
0013-4686

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✦ Synopsis

Electrostrictive stresses in barrier layers on aluminium were investigated by measuring the deformations of a clamped membrane electrode anodised on one side in aqueous ammonium borate electrolyte. If subsequent to a galvanostatic oxidation the forming voltage 'p, was kept constant for 2-16 h, the average electrostrictive stress component O* observed in the voltage range cp < 0.85 cp, obeys a relation me N -27((p/(p,)' N/mm*. Its interpretation in terms of a simple model involving the density dependence of the permittivity of the oxide yields a Poisson ratio v !X 0.45. However, the compressive stresses rise progressively with 'pz in the range 0.85 'p, < Q < q,.

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