The effect of the addition of sulfate ions (SO42–) on corrosion inhibition of Aluminum Association (AA) 7075 aluminum (Al) alloy (UNS A97075) in aqueous solution was studied. Corrosion behavior was affected significantly by the addition of SO42–. The corrosion morphology and corrosion rate changed with various thermomechanical treatments and with the relative amount of sodium sulfate (Na2SO4) and sodium chloride (NaCl) in the immersion test solutions. However, the inhibitive effect of SO42– was evident with the increasing relative amount of Na2SO4. Corrosion data and morphologies obtained were illustrated by a competitive anion adsorption mechanism.

Subject
Anions, Pits, Immersion tests, Corrosion rate, Aluminum, Sodium chloride, Roughness, Sodium chloride solution, Oxide surfaces, Corrosion morphology, Corrosion inhibitors, Pitting, Aluminum alloys
Keywords:
AA 7075, aluminum alloys, corrosion rate, inhibitors, intergranular corrosion, pit morphology, pitting, scanning electron microscopy, weight loss
NACE International
1995
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