The long-term atmospheric corrosion behavior of extruded aluminum alloy 7075-T6 (UNS A97075) was investigated by weight loss, corrosion morphology, loss in mechanical properties, and corrosion products in field testing that lasted more than 20 years. The results demonstrated that extruded 7075-T6 exposed for 20 years suffered obvious exfoliation and inter-granular corrosion in coastal atmospheres, and that their mechanical properties drastically decreased. In industrial and coastal-industrial atmospheres, weight losses for extruded 7075-T6 were high and the corrosion products were mainly aluminum sulfate hydroxide hydrates (Al2SO4[OH]·H2O and AlSO4[OH]·5H2O), respectively.

Subject
Test methods, Marine environments, Materials, Aluminum, Atmosphere, Exfoliation, Mechanical properties, Corrosion products, Corrosion losses, Corrosion morphology, Weight loss, Elongation, Pitting
Keywords:
aluminum, atmospheric corrosion, exfoliation corrosion, scanning electron microscopy, weight loss, x-ray diffraction
© 2011 NACE International
2011
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