The influence of tensile stress on electrochemical noise from aluminum alloy in chloride media

An investigation was carried out on the potential features of 7075-T76 aluminum alloy under various constant stresses in 3.5% NaCl solutions. The applied stress accelerated the formation of electric double-layer at aluminum alloy/solution interface, and the formation time became shorter with the stress increasing. As the stress was applied, the fluctuating range and energy of potential noise improved in the low-frequency and reduced in the high-frequency while potential noise exhibited the characteristics of pitting corrosion. Potential fluctuation decreased gradually with time under loading. When the stress was released from the specimen, potential fluctuation weakened apparently, especially in the lower frequency range.