Effects of cerium on the compositional variations in and around inclusions and the initiation and propagation of pitting corrosion in hyperduplex stainless steels |
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| Affiliation: | 1. Department of Material Science and Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, Republic of Korea;2. Stainless Steel Research Group, POSCO Technical Research Laboratories Goedong-dong, Nam-Gu, Pohang, Gyeongbuk 790-785, Republic of Korea;1. ICB, UMR 6303 CNRS—Université Bourgogne-Franche Comté, BP 47870, 21078 Dijon Cedex, France;2. APERAM R&D—BP 15, rue Roger Salengro, 62330 Isbergues, France;1. Key Laboratory for Corrosion and Protection of the Ministry of Education, Institute of Advanced Materials & Technology, University of Science and Technology Beijing, Beijing, China;2. Department of Materials and Chemistry, Research Group Electrochemical and Surface Engineering (SURF), Vrije Universiteit Brussel, Brussels, Belgium;3. Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang, China |
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| Abstract: | Ce addition to a hyperduplex stainless steel increased its resistance to pitting corrosion because of the formation of stable Ce oxides and a decrease in the area of microcrevices between the matrix and inclusions that act as pit initiation sites. In addition, Cr-enriched zones were formed around Ce oxides with low Cr content in the Ce added alloy. Pitting corrosion in the base alloy initiated at the microcrevice and propagated to Cr oxides, which deteriorated the pitting corrosion resistance. However, pitting corrosion in the Ce added alloy propagated not to the stable Ce oxides but to the matrix. |
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| Keywords: | A. Rare earth elements A. Stainless steel B. SEM B. Polarization C. Pitting corrosion |
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