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Acid pickling of martensitic steel11/12/2022 ![]() ![]() Schmauder, Cyclic Behaviour of 12% Cr Ferritic-Martensitic Steel Upon Long-Term On-Site Service in Power Plants, Fatigue Fract. Fang, Microstructure Evolution and Stress Corrosion Cracking Susceptibility of 12Cr Martensitic Steel Upon Long-Term Service in Power Plants, J. Koschel, Corrosion and Metallurgical Investigation of Two Supermartensitic Stainless Steels for Oil and Gas, Corros. Bhambri, Intergranular Fracture in 13 wt.% Chromium Martensitic Stainless, J. On the other hand, the MSS tempered at 300 and 700 ☌ did not show any localized attack in HNO 3 and this was attributed to lack of sensitization at 300 ☌ and de-sensitization at 700 ☌. The inability of sensitized MSS tempered at 550 ☌ to form a protective surface film was attributed to the formation of considerable nano-sized Cr-rich carbide precipitates associated with narrow Cr depletion zones. ![]() Characterization of surface film on this condition revealed an oxide with a higher defect density (through electrochemical impedance spectroscopy–Mott–Schottky analysis) and Fe content (x-ray photoelectron spectroscopy) as compared to that for the austenitized condition. The MSS tempered at 550 ☌ showed sensitization and significant localized attack during tests in HNO 3. Electrochemical characterizations to establish localized corrosion susceptibility were performed in 5% HNO 3 solution. Tempering was done in the temperature range of 300-700 ☌ after austenitization, and microstructure was established using scanning and transmission electron microscopy. Intergranular corrosion behavior of a 13Cr martensitic stainless steel (MSS) in tempered condition was studied. ![]()
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