Ca、Mg掺杂下夹杂物对C70S6非调质钢点蚀行为的影响

doi:10.11900/0412.1961.2021.00362

金属学报

2022, Vol. 58

Issue (7): 895-904 DOI: 10.11900/0412.1961.2021.00362

研究论文

本期目录 | 过刊浏览

Ca、Mg掺杂下夹杂物对C70S6非调质钢点蚀行为的影响

孙阳庭, 李一唯, 吴文博, 蒋益明(

), 李劲

复旦大学材料科学系上海 200433

Effect of Inclusions on Pitting Corrosion of C70S6 Non-Quenched and Tempered Steel Doped with Ca and Mg

SUN Yangting, LI Yiwei, WU Wenbo, JIANG Yiming(

), LI Jin

Department of Materials Science, Fudan University, Shanghai 200433, China

引用本文:

孙阳庭, 李一唯, 吴文博, 蒋益明, 李劲. Ca、Mg掺杂下夹杂物对C70S6非调质钢点蚀行为的影响[J]. 金属学报, 2022, 58(7): 895-904.
Yangting SUN, Yiwei LI, Wenbo WU, Yiming JIANG, Jin LI. Effect of Inclusions on Pitting Corrosion of C70S6 Non-Quenched and Tempered Steel Doped with Ca and Mg[J]. Acta Metall Sin, 2022, 58(7): 895-904.

全文: PDF(3259 KB) HTML

摘要:

通过溶液调制的方法对C70S6非调质钢及其掺Ca、Mg样品进行了动电位极化曲线测试,并对测试前后的样品进行了SEM-EDS表征,揭示了夹杂物对非调质钢点蚀行为的影响。结果表明,MnS夹杂易作为活性位点诱发点蚀,而掺杂Ca、Mg元素使得夹杂物分布更弥散,MnS含量更低,相应的点蚀抗性也更高。

关键词 ：非调质钢, 夹杂物, 点蚀

Abstract：

As one of the energy-saving steels, non-quenched and tempered steel commonly requires the addition of alloying elements to improve its properties. The inclusions related to those elements have significant influence on the properties of the steels. In this work, the potentiodynamic polarization curves of C70S6 non-quenched and tempered steel and its Mg-Ca doped samples were measured by solution modification, and the samples before and after the test were characterized by SEM-EDS. The results show that the MnS inclusions in the samples act as active sites for pitting. The doped Ca and Mg elements make the distribution of inclusions more dispersed and the content of MnS in each inclusion lower, leading to the better pitting resistance of the doped specimens.

Key words： non quenched and tempered steel inclusion pitting corrosion

收稿日期: 2021-08-30

ZTFLH:

TG174.3

基金资助:国家重点研发计划项目(2018YFB0704400);国家自然科学基金项目(51901046)

作者简介: 孙阳庭,男,1991年生,副研究员,博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2021.00362 或 https://www.ams.org.cn/CN/Y2022/V58/I7/895

表1 C70S6非调质钢中夹杂物类型、数量及尺寸分布

表2 C70S6-CaMg非调质钢中夹杂物类型、数量及尺寸分布

图1 C70S6及C70S6-CaMg非调质钢中MnS夹杂物等效直径分布图

图2 C70S6夹杂形貌夹杂物的微观形貌及EDS元素分布图

图3 C70S6-CaMg夹杂形貌及EDS元素分布图

图4 不同碱性条件下409L不锈钢的极化曲线

图5 不同pH值下纯Fe的极化曲线

图6 pH = 12.6时不同Cl-浓度[Cl-]下纯Fe的开路电位(OCP)和极化曲线

图7 pH = 12.6、[Cl-] = 1 mol/L条件下Fe、C70S6和C70S6-CaMg的OCP和极化曲线

图8 pH = 12、不同Cl-浓度下C70S6-CaMg的OCP和极化曲线

图9 pH = 12、[Cl-] = 0.1 mol/L条件下C70S6及C70S6-CaMg样品的OCP和极化曲线

图10 C70S6-CaMg和C70S6极化曲线测试后的蚀坑形貌

图11 pH = 12.3、[Cl-] = 0.1 mol/L条件下C70S6和C70S6-CaMg的极化曲线

图12 pH = 12.3、[Cl-] = 0.1 mol/L时,C70S6-CaMg及C70S6的蚀坑形貌

图13 C70S6和C70S6-CaMg样品经恒电位极化后的OM像

图14 C70S6主蚀坑形貌及EDS元素分布图

图15 C70S6夹杂蚀坑形貌及EDS元素分布图

图16 C70S6主蚀坑成分及夹杂蚀坑成分

图17 C70S6-CaMg夹杂蚀坑形貌及EDS元素分布图

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