Evaluation of Hardness and Corrosion Behavior of An AA 7175 aluminum alloy in Sulfuric Acid Environment

The corrosion of the AA7175 aluminum alloy in different acidity of sulfuric acid solution was studied using weight loss technique and microhardness measurements. The magnitude of corrosion of this metal in PH of (- 0.78, - 0.5, - 0.4 and - 0.12 of solutions of H2SO4 was studied for an exposure period of 240 minutes. Weight loss measurements in these pH of acid solutions have shown a higher corrosion resistance for the aged alloy as compared to the as received condition. The study confirmed that the microhardness of the AA7175 aluminum alloy tends to reduce linearly with increasing mass loss. Also, the formation of Mg2Zn can reduce the corrosion phenomena, the corrosion can be classed as pitting or interganular corrosion.