Stress Corrosion Cracking and Anodic Dissolution Behavior of 5083 Aluminum Alloy(Materials, Metallurgy & Weldability)

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The effect of applied tensile stress and continuous strain on the dissolution behavior of 5083 aluminum alloy has been investigated in relation to the stress corrosion cracking susceptibility of short transverse direction of the alloy. Stress corrosion cracking tests were carried out by means of constant strain rate tequniques under various anodic potentials. Aqueous solution of 1.0mol/L NaCl+0.1mol/L H_2O_2 ajusted at pH 11.0 was used as corrosive solution. Strained electrode reactions were also studied as functions of tensile stress, continuous strain, electrode potential and microstructure. The potential that the anodic current in polarization curves began to increase from the constant current density similar to passive state was defined as the breakdown potential (E_b). E_b was found to depend on polarization rate, the amount of grain boundary precipitate and applied tensile stress. The potential that does not provide stress corrosion cracking could be expressed by using both the potentials that does not labilized the surface oxide film after holding at the potential for certain times and the stress dependence of E_b.
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