Aluminium and aluminium alloy
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Stress-corrosion cracking<br />
• Stress-corrosion cracking (SCC) develops when the <strong>alloy</strong> is<br />
exposed to simultaneous tensile stress in a corrosive environment,<br />
i.e., water vapour (with trace halide iron)<br />
• The failure stress is well below the level<br />
of the yield strength.<br />
• Electrochemistry between<br />
metallurgical structures <strong>and</strong><br />
corrosive environment dominates<br />
the SCC.<br />
• Cu, Mg, Zn, Si <strong>and</strong> Li as solute<br />
elements have the adverse effects.<br />
Note: Should avoid stressing in<br />
direction normal to the short<br />
transverse direction (susceptible to<br />
corrosion due to mechanical<br />
fibering).<br />
Pitting <strong>and</strong> cracking in stress corrosion testing<br />
of weld tensile specimen of AA7075-AA6065<br />
dissimilar joint<br />
Suranaree University of Technology Tapany Udomphol<br />
May-Aug 2007
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