Influence of Nitrogen Content on the Corrosion Behavior of Powder Metallurgy Nickel-Free Austenitic Stainless Steel

Weili Yu, Changhai Du, Hongren Shen, Hao He, Yong Yu, Yimin Li, Fenghua Luo
2021 Advances in Materials Science and Engineering  
Herein, powder metallurgy gas-solid nitriding was used to prepare a high-nitrogen Ni-free austenitic stainless steel with more than 1.0 wt.% N. Study of the microstructures and corrosion resistances of the as-prepared samples revealed that the corrosion weight loss, size, number of corrosion pits, and corrosion depth decreased as the N content increased from 1.19 to 1.37 wt.%. The self-corrosion current densities of the alloys were determined from their potentiodynamic polarization curves. The
more » ... hanges in the capacitive arc radius as demonstrated by the Nyquist curves were consistent with the conclusions of the immersion corrosion analysis; that is, a high N content leads to a high corrosion resistance.
doi:10.1155/2021/7808070 doaj:1632891981724e4784c78d59c6cb4157 fatcat:z2eh22tknvbolppoyrs7ijmriu