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Effects of Boron on Microstructure and Metastable Pitting Corrosion Behavior of Super304H Austenitic Stainless Steel
Bai, Guanshun; Lu, Shanping; Li, Dianzhong; Li, Yiyi; shplu@imr.ac.cn
2015
Source PublicationJOURNAL OF THE ELECTROCHEMICAL SOCIETY
ISSN0013-4651
Volume162Issue:9Pages:C473-C481
AbstractThe effects of boron on the microstructure and the pitting corrosion behavior, especially the metastable pitting, were investigated in Super304H austenitic stainless steels with 0-130 ppm boron solution treated at 1100 degrees C. The microstructures were analyzed using scanning electron microscopy, transmission electron microscopy with energy dispersive spectroscopy and secondary ion Mass spectroscopy. Meanwhile, the pitting corrosion behavior was evaluated by potentiodynamic and potentiostatic polarization tests in 3.5% NaCl solution at 25 degrees C. Microstructural characterizations showed that boron addition favored the precipitation of Cr-rich boride (M2B), which resulted in an asymmetric Cr-depleted zone around M2B and reduced the chromium content in the austenite matrix. The Cr-depleted zones could act as extra sites for pit initiation, along with the interfaces between the austenite matrix and non-metallic inclusions. The potentiodynamic polarization test results indicated that boron addition decreased the pitting potential. The potentiostatic test results revealed that boron addition promoted the initiation frequency and growth rate of metastable pits, and increased the probability of stable pitting. (C) 2015 The Electrochemical Society.
description.department[bai, guanshun ; lu, shanping ; li, dianzhong ; li, yiyi] chinese acad sci, inst met res, shenyang natl lab mat sci synl, shenyang 110016, peoples r china
Funding Organizationnational high technology research and development program of China [2012AA03A501]
Indexed Bysci
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/74780
Collection中国科学院金属研究所
Corresponding Authorshplu@imr.ac.cn
Recommended Citation
GB/T 7714
Bai, Guanshun,Lu, Shanping,Li, Dianzhong,et al. Effects of Boron on Microstructure and Metastable Pitting Corrosion Behavior of Super304H Austenitic Stainless Steel[J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY,2015,162(9):C473-C481.
APA Bai, Guanshun,Lu, Shanping,Li, Dianzhong,Li, Yiyi,&shplu@imr.ac.cn.(2015).Effects of Boron on Microstructure and Metastable Pitting Corrosion Behavior of Super304H Austenitic Stainless Steel.JOURNAL OF THE ELECTROCHEMICAL SOCIETY,162(9),C473-C481.
MLA Bai, Guanshun,et al."Effects of Boron on Microstructure and Metastable Pitting Corrosion Behavior of Super304H Austenitic Stainless Steel".JOURNAL OF THE ELECTROCHEMICAL SOCIETY 162.9(2015):C473-C481.
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