Erosion- and wear-corrosion behavior of Fe–Mn–Al alloys in NaCl solution

The erosion- and wear-corrosion behavior of solution-annealed and age-treated Fe–Mn–Al alloys in aerated 3% NaCl solution were investigated using a self-made rotating cylinder electrode system. The results showed that the open circuit potentials of Fe–Mn–Al alloys in 3% NaCl solution increased with increasing rotation speed during the erosion-corrosion test, but decreased with increasing rotation speed and contact load during the wear-corrosion test. Potentiodynamic polarization curves showed that the Fe–Mn–Al alloys had no passive region during erosion- and wear-corrosion tests, except that the solution-annealed specimen had an active-to-passive transition behavior during the erosion-corrosion test. After potentiodynamic polarization curve measurements during erosion- and wear-corrosion tests, the ferrite phase in solution-annealed Fe–Mn–Al alloy was prone to corrode with respect to the austenite phase. However, for age-treated Fe–Mn–Al alloy, corrosion preferentially occurred in the austenite phase region where β-Mn precipitated.