Pitting Behavior of Fe-based Amorphous Alloy with Sulfide Inclusion

doi:10.11902/1005.4537.2020.148

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (4): 477-486 DOI: 10.11902/1005.4537.2020.148

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Pitting Behavior of Fe-based Amorphous Alloy with Sulfide Inclusion

ZHANG Haoran¹, WU Hongyan², WANG Shanlin¹(

), ZUO Yao¹, CHEN Yuhua¹, YIN Limeng³

^1.Jiangxi Key Laboratory of Forming and Joining Technology for Aviation Components, Nanchang 330063, China
^2.Jiujiang Vocational and Technical College, Jiujiang 332007, China
^3.School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, China

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Abstract

The electrochemical corrosion behavior and corrosion morphology of Fe-based amorphous alloys containing sulfide inclusion were examined by means of electrochemical workstation and transmission electron microscope. The results show that both of the sulfide inclusions Al₂S₃ and precipitates Al₅₇Mn₁₂ exist in the amorphous alloy. The corrosion rate of the amorphous alloy increases with the increase of the concentration of FeCl₂ in the solution. The passivation film in the Cr-depleted zone around the inclusions is weak, which is the location of pitting initiation. Al and Mn of precipitates Al₅₇Mn₁₂ are preferentially dissolved in FeCl₂ solution, resulting in pits initiation, however, in the solutions of higher FeCl₂ concentration, secondary pores within pits could form due to the presence of autocatalytic effect.

Key words: Fe-based amorphous alloy sulfide inclusion corrosion resistance pitting

Received: 12 August 2020

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51965044);Project of Chinese Ministry of Armament(41423060313);Graduate Student Innovation Special Fund Project of Jiangxi Province(YC2020-S538)

Corresponding Authors: WANG Shanlin E-mail: slwang70518@nchu.edu.cn

About author: WANG Shanlin, E-mail: slwang70518@nchu.edu.cn

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Cite this article:

ZHANG Haoran, WU Hongyan, WANG Shanlin, ZUO Yao, CHEN Yuhua, YIN Limeng. Pitting Behavior of Fe-based Amorphous Alloy with Sulfide Inclusion. Journal of Chinese Society for Corrosion and protection, 2021, 41(4): 477-486.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2020.148 OR https://www.jcscp.org/EN/Y2021/V41/I4/477

Table 1 Chemical compositions of the used industrial raw materials (mass fraction / %)

Fig.1 XRD pattern (a) and DSC curve (b) of the Fe-based amorphous casting rod

Fig.2 SEM morphology of the cross sections (a), TEM morphology of the inclusion area and the electron diffraction pattern of the matrix in the area A, EDS analysis result (c) and calibration of electron diffraction pattern of the inclusion in the area B (d) of the Fe-based amorphous alloy

Fig.3 Potentiodynamic (a) and patentiostatic (b) polarization curves of the Fe-based amorphous alloy in FeCl₂ solution with different concentrations

Table 2 Electrochemical polarization experimental parameters of the Fe-based amorphous alloy in FeCl₂ solution with different concentrations

Fig.4 Corrosion rates of the Fe-based amorphous alloy in FeCl₂ solution with different concentrations

Fig.5 Corrosion morphologies of the Fe-based amorphous alloy after immersion for 0 d (a, e, i, m), 3 d (b, f, j, n), 9 d (c, g, k, o) and 15 d (d, h, l, p) in FeCl₂ solutions with 0.5 mol/L (a~d), 1 mol/L (e~h), 2 mol/L (i~l) and 4 mol/L (m~p)

Fig.6 TEM morphologies of the inclusion area before the immersion (a), TEM morphologies of the inclusion area and the calibration of electron diffraction pattern of the inclusion in the area B after the immersion (b), line scan analysis result of the inclusion in the direction A (c) and EDS analysis result of the inclusion in the area B (d) of the Fe-based amorphous alloy after the immersion in 4 mol/L FeCl₂ solution for 1 h

Fig.7 SEM morphologies of the electrode surface after polarization experiment in 0.5 mol/L (a), 4 mol/L (b), FeCl₂ solution, and of the pitting pits after polarization experiment in 0.5 mol/L (c), 1 mol/L (d), 2 mol/L (e), 4 mol/L (f) FeCl₂ solution

Fig.8 Schematic diagrams of pitting initiation and development of Fe-based amorphous containing sulfide inclusions in FeCl₂ solution: (a) before the immersion, (b) beginning of the passive film dissolution, (c) dissolution of the inclusions, (d) appearance of the pitting pits

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