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

doi:10.11900/0412.1961.2021.00362

Acta Metall Sin

2022, Vol. 58

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

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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

Cite this article:

SUN Yangting, LI Yiwei, WU Wenbo, JIANG Yiming, LI Jin. Effect of Inclusions on Pitting Corrosion of C70S6 Non-Quenched and Tempered Steel Doped with Ca and Mg. Acta Metall Sin, 2022, 58(7): 895-904.

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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

Received: 30 August 2021

ZTFLH:

TG174.3

Fund: National Key Research and Development Program of China(2018YFB0704400);National Natural Science Foundation of China(51901046)

About author: JIANG Yiming, professor, Tel: (021)31243648, E-mail: ymjiang@fudan.edu.cn

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	Yangting SUN
	Yiwei LI
	Wenbo WU
	Yiming JIANG
	Jin LI

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https://www.ams.org.cn/EN/10.11900/0412.1961.2021.00362 OR https://www.ams.org.cn/EN/Y2022/V58/I7/895

Table 1 Inclusion type, number, and size of C70S6 non-quenched and tempered steel

Table 2 Inclusion type, number, and size of C70S6-CaMg non-quenched and tempered steel

Fig.1 Equivalent diameter distribution of MnS inclusions in C70S6 and C70S6-CaMg non-quenched and tempered steel

Fig.2 Inclusion morphology (a) and element distribution maps (b) of C70S6

Fig.3 Inclusion morphology (a) and element distribution maps (b) of C70S6-CaMg

Fig.4 Polarization curves of 409L stainless steel under different alkaline conditions

Fig.5 Polarization curves of pure iron at different pH

Fig.6 Open circuit potential (OCP) (a) and polarization (b) curves of pure iron with different Cl^- concentration [Cl^-] at pH = 12.6

Fig.7 OCP (a) and polarization (b) curves of Fe, C70S6, and C70S6-CaMg at pH = 12.6 and [Cl^-] = 1 mol/L

Fig.8 OCP (a) and polarization (b) curves of C70S6-CaMg at different [Cl^-] and pH = 12

Fig.9 OCP (a, c) and polarization (b, d) curves of C70S6 (a, b) and C70S6-CaMg (c, d) at pH = 12 and [Cl^-] = 0.1 mol/L

Fig.10 Etch pit morphologies of C70S6-CaMg (a) and C70S6 (b) after polarization curve test

Fig.11 Polarization curves of C70S6 and C70S6-CaMg at pH = 12.3 and [Cl^-] = 0.1 mol/L

Fig.12 Pit morphologies of C70S6-CaMg (a) and C70S6 (b) at pH = 12.3 and [Cl^-] = 0.1 mol/L

Fig.13 OM images of C70S6 (a) and C70S6-CaMg (b) samples after potentiostatic polarization

Fig.14 Main pit morphology (a) and element distribution maps (b) of C70S6

Fig.15 Pit morphology (a) and element distribution maps (b) of C70S6

Fig.16 Main pit (a) and inclusion pit (b) (insets) compositions of C70S6

Fig.17 Pit morphology (a) and element distribution maps (b) of C70S6-CaMg (Red arrows point to the dissolved grooves between the matrix and the MnS；yellow arrows point to the dissolved grooves between sulfides and oxides)

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