Effect of Cerium on Mechanisms of Pitting Corrosion Induced by Inclusions in a 304 Stainless Steel

被引：3

作者：

Zhang, Ji ^{[1
]}

Zhang, Lifeng ^{[2
]}

Ren, Qiang ^{[3
]}

Hu, Jinzhen ^{[1
]}

机构：

[1] USTB, Sch Met & Ecol Engn, Beijing 100083, Peoples R China

[2] North China Univ Technol, Sch Mech & Mat Engn, Beijing 100144, Peoples R China

[3] Yanshan Univ, Sch Mech Engn, Qinhuangdao 066004, Hebei, Peoples R China

来源：

ISIJ INTERNATIONAL | 2023年 / 63卷 / 05期

关键词：

cerium; inclusions; pitting process; first-principles calculations; stainless steel; RARE-EARTH-ELEMENTS; LOCALIZED CORROSION; IMPACT TOUGHNESS; STAINLESS-STEEL; CARBON-STEEL; MICROSTRUCTURE; EVOLUTION; CE; BEHAVIOR; THERMODYNAMICS;

D O I：

10.2355/isijinternational.ISIJINT-2022-333

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Laboratory experiments were performed to study the pitting process induced by different kinds of inclusions in stainless steels with and without cerium. When the content of total cerium in the stainless steel increased from 0 to 430 ppm, the evolution path of inclusions in the stainless steel was Al2O3-SiO2-MnO(-CaO)-MnS -> Ce-Al-Si-Ca-O-S -> homogeneous Ce-O-S -> heterogeneous Ce-O-S. Immersion test was performed and morphologies of pits induced by different types of inclusions were observed. The dissolution sequence was Ce-O phase in heterogeneous Ce-O-S and MnS -> homogeneous Ce-O-S, Ce-S phase in heterogeneous Ce-O-S and steel matrix -> Ce-Al-Si-Ca-O-S -> Al2O3-SiO2-MnO(-CaO). A corrosion index was defined to compare the corrosion resistance of the steel matrix around inclusions. Besides, first-principles calculations of related inclusions were performed to clarify the mechanism of pitting corrosion induced by different kinds of inclusions in the stainless steel.

引用

页码：779 / 790

页数：12

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