Electrochemical noise Analysis of the Corrosion Behaviors of Al-Zn- In based Alloy in NaCl Solution

The corrosion behaviors of Al–5Zn–0.02In–1Mg–0.05Ti (wt. %) alloy immersion in 3.5% NaCl solution were analyzed using electrochemical noise. At the initial immersion, the potential noise due to the pitting shows small fluctuation of less than 1 mV about 5 s intervals. After 10 h immersion, the potential noise due to the dissolution/precipitation shows larger fluctuation about 5 mV at 10 s intervals. In the later corrosion, the potential noise caused by the uniform corrosion shows the fluctuation about 10 mV at 60 s intervals.