Effects of Na2S, NaCl, and H2O2 Concentrations on Corrosion of Aluminum

The objective of this study was to investigate the corrosion behavior of aluminum (AA1100) in a mixed solution of 0 similar to 0.1 g/L Na2S + 0.3 similar to 3 g/L NaCl + 0 similar to 10 mL/L H2O2. Potentiodynamic polarization tests were performed. Effects of solution compositions on corrosion potential, corrosion rate, and pitting potential of aluminum were statistically analyzed with a regression model. Results suggested that localized corrosion susceptibility of aluminum was increased in the solution with increasing concentration of NaCl because the pitting potential was lowered linearly with increasing NaCl concentration. On the contrary, H2O2 mitigated the galvanic corrosion of aluminum by increasing the corrosion potential. It also mitigated localized corrosion by increasing the pitting potential of aluminum. Na2S did not exert a noticeable effect on the corrosion of aluminum. These effects of different chemical species at various concentrations were independent of each other. Synergy or offset effect was not observed.