On Mechanical Response of Aluminum Alloys in Corrosive Environment

Abstract

Al6061T6 and Al7075T6 aluminum alloys are subjected to accelerated salt spray corrosion to evaluate the amount of degradation and the effect on mechanical behavior. The specimens were stored in a closed chamber with continuous salt spray for a period of 250 hours and 500 hours, respectively. It was observed that the oxide layer was unprotective after prolonged salt spray resulting in pitting continued with exfoliation corrosion. The tensile test results show that there was a remarkable decrease in tensile properties with exposure time. A significant reduction in tensile strength, yield strength, elongation at yield, elongation at break, and overall toughness in both the alloys was observed at 500 hours. The impact strength decreased by 14.4 % and 26.47 %, Rockwell hardness (HRB) reduced by 12.2% and 20.71% for respective alloys at 500 hours of exposure. However, there was an increasing trend in elastic stiffness which attributed to decrease in ductility. Furthermore, it was comparatively observed that Al7075T6 is more susceptible to corrosion than Al6061T6.

Analysis of The Corrosion Inhibition Efficacy of Camellia Sinensis Extract on Aluminium 6061 Alloys using Artificial Neural Network (ANN)

“…Aluminium 6061 is one of the most used metals in certain industries because of its advantages, which one of them is its corrosion resistance. However, aluminium faces limitations in certain corrosive environments [3], [4]. Extended exposure to rapid salt spray corrosion [3] may result in the formation of insufficient oxide layers, which can induce pitting and exfoliation corrosion, resulting in a substantial decrease in mechanical properties which includes tensile strength and impact strength [3], [5].…”

“…However, aluminium faces limitations in certain corrosive environments [3], [4]. Extended exposure to rapid salt spray corrosion [3] may result in the formation of insufficient oxide layers, which can induce pitting and exfoliation corrosion, resulting in a substantial decrease in mechanical properties which includes tensile strength and impact strength [3], [5]. Another study had also obtained, that acidic solutions, such as HCl, can greatly accelerate the corrosion rate of aluminium alloys, especially when exposed to different concentrations and temperatures [6].…”