| Effect of Co addition on the corrosion resistance of maraging stainless steel Wei Wang1; 1, shenyang, China; PAPER: 223/Corrosion/Regular (Oral) SCHEDULED: 15:15/Tue. 29 Nov. 2022/Andaman 2 ABSTRACT: Neutral salt spray test and polarization test were used to compare the corrosion resistance of Co-containing maraging stainless steels with that of other three commercial stainless steels. The test results showed that the maraging stainless steel with high content of Co showed poor corrosion behavior. Observation on microstructure of the maraging stainless steels proved that the segregation of Cr in the matrix deteriorated its corrosion resistance. The surface morphology of the aged maraging stainless steel with high content of Co indicated that during passive process the new formed passive film with sinusoidal distribution could be easily broken down by the invade medium and finally caused poor corrosion resistance. Meantime, it was proved by first principle calculations that Co increased Fe-Fe ferromagnetic interaction which increased the clustering tendency of Cr atoms and facilitated the formation Cr-rich clusters. |
