Influence of environments on constant displacement stress corrosion crack growth in high strength aluminium alloys

Report (1981)

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Fractography Crack propagation Aluminium alloys Stress corrosion cracking Atmospheric effects Environment effects Corrosion tests High strength alloys Accelerated life tests Sea water Submerging Stress in density factors
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Published Date

30-09-1981

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NLR-TR 81138 U

Abstract

An experimental investigation was carried out into the applicability of various corrosive environments for stress corrosion crack propagation testing of high strength aluminium alloys using double cantilever beam specimens. Testing under atmospheric conditions was used as a reference. It was found that stress corrosion crack growth under atmospheric conditions was influenced by the wedging action of corrosion products, making the determination of a threshold stress intensity factor less relevant. Corrosion product wedging was particularly important for testing by periodic moistening with a 3.5 % NaCl solution. Its crack growth promoting effect is advantageous for distinguishing differences between SCC resistant alloys. The crack growth behaviour under atmospheric conditions was reflected best by alternate immersion in synthetic seawater. The amount of SCC growth found for continuous immersion in an acidified salt-chromate solution proved to be too small to distinguish between alloys with intermediate and high resistance to SCC.