The evaluation of the repassivation tendency of Cr-Mn and Cr-Ni steels using scratch technique

Electrochemical and Surface Analytical Approach to Passive Film on 200 Series Stainless Steels Formed in Sulfuric Acid

“…Beneficial effect of N on the resistance to localized corrosion is well established and explained by various models. 6) Enrichment of N at the film matrix interface is generally considered responsible for enhancing the corrosion resistance of stainless steel.…”

“…4) However, the number of research works on the corrosion behaviour of 200 series is limited compared to that on 300 series stainless steels and there is some discrepancy on the role of Mn. [5][6][7] Fourie and Bentley 5) investigated the corrosion behaviour of austenitic stainless steels with replacement of 8 % Ni by 15 % Mn in 0.05 M H 2 SO 4 . They report addition of 15 % Mn to Fe-17Cr alloy decreases the ability to passivate, but partial replacement of Ni with Mn does not change its passivity.…”

“…This indicates a possibility of further development of Cr-Mn-Ni stainless steel with a appropriate combination of Ni to Mn ratio and incorporating other austenite formers such as N and Cu. Ahila et al 6) evaluated the repassivation kinetics of Cr-Mn and Cr-Ni steels, without and with N contents, using scratched electrode technique in a sulphate solution with different level of chloride contents. Repassivation behaviour of Cr-Mn alloys was found similar to that of Cr-Ni alloys, but effect of N was more pronounced in Cr-Mn steels leading to faster repassivation rate.…”

Effect of nitrogen addition on the stress corrosion cracking behavior of 904L stainless steel welds in 288°C deaerated water

“…Beneficial effect of nitrogen towards localized corrosion behavior of wrought as well as welds of austenitic stainless steel (SS) products in a variety of environments at normal temperatures and pressure is known [1][2][3][4]. However, its effect on welds towards high temperature and high pressure water corrosion is less known.…”

Pitting corrosion of Cr–Mn–N steel in sulphuric acid media

“…Numerous nitrogen containing stainless steels with different nitrogen content have been reported: classical Cr-Ni steels with incorporated nitrogen [1][2][3][4][5][6], Cr-Ni steels with reduced nickel content, partially or fully replaced by austenite forming elements, more frequently manganese, etc. [3].…”