Effects of Cl-concentration, Temperature and AC Interference on Metastable Pitting Behaviorofcocrfemnni High-entropy Alloy in a Simulated Concrete Pore Solution

The metastable pitting corrosion behavior of CoCrFeMnNi HEA in a simulated concrete environment was studied under different factors by electrochemical measurements, statistics analysis method and scanning electron microscopy (SEM). The results show that the pitting corrosion resistance of the HEA under the impact of increasing Cl- concentration, solution temperature and iAC is weakened. The three factors promote the initiation and propagation of metastable pitting, and facilitate the evolution of metastable pitting to stable pitting. By comparing the data obtained by statistical analysis method, it can be concluded that the order of influence effect on the metastable pitting of the HEA is: solution temperature > AC interference > Cl- attack.