Abstract
The ferritic stainless steels X12Cr13 and X6Cr17 were subjected to plasma nitriding at temperature of 400°C and 550 °C, 24 h in 3H2:1N2 (l/h) and 1H2:3N2 (l/h) nitriding gas ratio and compared to untreated one. The microstructure and microhardness of the untreated and nitrided stainless steel were evaluated. The corrosion properties of the untreated and plasma nitrided steel samples were evaluated using the anodic potentiodynamic polarization tests in neutral 2.5% NaCl deaerated solution. The phase analysis of nitrided steels samples was compared to untreated one. The results showed that plasma nitriding process on the X12Cr13 and X6Cr17 steels produced a nitride case with iron carbides Fe3C and iron nitrides Fe4N at lower temperature and above that chromium nitrides Cr4N4 and chromium iron carbide Cr15Fe7C6 at higher temperature of plasma nitriding process. Plasma nitriding process significantly increased the surface hardness of the martensitic stainless steels. The pitting was evaluated, and the pitting coefficient was calculated. During electrochemical corrosion tests, the untreated X12Cr13 and X6Cr17 stainless steels showed mostly slightly higher corrosion rates compared to plasma nitrided steel at lower temperature and extremely lower corrosion rate compared to plasma nitrided steel at higher temperature of plasma nitriding process.
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