Heon-Young Ha , Seong Hoon Kim , Kyeong-Won Kim , Tae-Ho Lee , Chi-Hyoung Won , Chang-Hoon Lee
{"title":"Effects of long-term annealing on pitting corrosion behavior of Type 304 borated stainless steels","authors":"Heon-Young Ha , Seong Hoon Kim , Kyeong-Won Kim , Tae-Ho Lee , Chi-Hyoung Won , Chang-Hoon Lee","doi":"10.1016/j.corcom.2024.08.001","DOIUrl":null,"url":null,"abstract":"<div><div>The effects of long-term annealing on the microstructure and pitting corrosion resistance of Fe<sub>balance</sub>-18Cr-12Ni-1.5Mn-(0.2 %, 0.8 %, 1.8 %, mass fraction)B stainless steels were investigated. For the B-containing stainless steels, annealing at 1180 °C for 192 h spheroidized the (Cr,Fe)<sub>2</sub>B phase, increased the grain size, and homogenized the element distribution in the <em>γ</em> matrix around (Cr,Fe)<sub>2</sub>B. Potentiodynamic polarization tests indicated that the long-term annealed samples had lower resistance to pitting corrosion than the unannealed samples, and Mott-Schottky analysis showed that the passive films formed on the annealed samples contained larger amount of point defects. In addition, the films on the annealed samples had a lower cation fraction of Cr than those on the unannealed samples. The changes in the pitting resistance and passive film properties were found to be primarily due to the grain growth during long-term annealing.</div></div>","PeriodicalId":100337,"journal":{"name":"Corrosion Communications","volume":"19 ","pages":"Pages 51-62"},"PeriodicalIF":0.0000,"publicationDate":"2024-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Corrosion Communications","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2667266924000665","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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Abstract
The effects of long-term annealing on the microstructure and pitting corrosion resistance of Febalance-18Cr-12Ni-1.5Mn-(0.2 %, 0.8 %, 1.8 %, mass fraction)B stainless steels were investigated. For the B-containing stainless steels, annealing at 1180 °C for 192 h spheroidized the (Cr,Fe)2B phase, increased the grain size, and homogenized the element distribution in the γ matrix around (Cr,Fe)2B. Potentiodynamic polarization tests indicated that the long-term annealed samples had lower resistance to pitting corrosion than the unannealed samples, and Mott-Schottky analysis showed that the passive films formed on the annealed samples contained larger amount of point defects. In addition, the films on the annealed samples had a lower cation fraction of Cr than those on the unannealed samples. The changes in the pitting resistance and passive film properties were found to be primarily due to the grain growth during long-term annealing.
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