Corrosion Resistance Comparison of High Manganese Steel in 0.01mol/L NaHSO₃ Solution and 3.5wt.% NaCl Solution

The corrosion behavior of high manganese steel in 0.01mol/L NaHSO₃ solution and 3.5wt.% NaCl solution was studied by cyclic immersion test and electrochemical test. The results show that with the increase of immersion time, the corrosion rate of high manganese steel in both solutions shows a decreasing trend. The Fe₂O₃ and γ-FeOOH in the rust layer gradually change into stable and dense Fe₃O₄ and α-FeOOH, and the ratio of α/γ* increases continuously. The corrosion potential (E_corr) of the rusted sample is continuously positive shifted, and the corrosion current density (I_corr) is continuously reduced, indicating that the protective effect of the rust layer on the steel substrate is gradually enhanced. Compared with 3.5wt.% NaCl solution, the rust layer of high manganese steel in 0.01mol/L NaHSO₃ solution is more compact and the corrosion resistance is stronger.