含硫化物夹杂的铁基非晶合金点蚀规律

doi:10.11902/1005.4537.2020.148

中国腐蚀与防护学报

2021, Vol. 41

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

研究报告

本期目录 | 过刊浏览

含硫化物夹杂的铁基非晶合金点蚀规律

张浩然¹, 吴鸿燕², 王善林¹(

), 左瑶¹, 陈玉华¹, 尹立孟³

^1.航空构件成形与连接江西省重点实验室南昌 330063
^2.九江职业技术学院九江 332007
^3.重庆科技学院冶金与材料工程学院重庆 401331

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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摘要:

采用电化学工作站和透射电镜等对含硫化物夹杂的铁基非晶合金进行了电化学腐蚀行为及腐蚀形貌分析。结果表明，铁基非晶合金的含硫化物夹杂为Al₂S₃和Al₅₇Mn₁₂。在FeCl₂溶液中表现出明显的钝化现象，腐蚀速率随溶液浓度的升高而升高；夹杂物周围贫Cr区的钝化膜薄弱，是点蚀萌生的位置；Al和Mn在FeCl₂溶液中优先溶解使夹杂处形成蚀坑，在较高的浓度下蚀坑中会因自催化效应进一步腐蚀生成次生孔。

关键词 ：铁基非晶合金, 硫化物夹杂, 耐蚀性能, 点蚀

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

收稿日期: 2020-08-12

ZTFLH:

TG174

基金资助:国家自然科学基金(51965044);装备部项目(41423060313);江西省研究生创新基金(YC2020-S538)

通讯作者: 王善林 E-mail: slwang70518@nchu.edu.cn

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

作者简介: 张浩然，男，1997年生，硕士生

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引用本文:

张浩然, 吴鸿燕, 王善林, 左瑶, 陈玉华, 尹立孟. 含硫化物夹杂的铁基非晶合金点蚀规律[J]. 中国腐蚀与防护学报, 2021, 41(4): 477-486.
Haoran ZHANG, Hongyan WU, Shanlin WANG, Yao ZUO, Yuhua CHEN, Limeng YIN. Pitting Behavior of Fe-based Amorphous Alloy with Sulfide Inclusion. Journal of Chinese Society for Corrosion and protection, 2021, 41(4): 477-486.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.148 或 https://www.jcscp.org/CN/Y2021/V41/I4/477

表1 工业原材料的化学成分[10]

图1 铁基非晶铸棒微观结构分析

图2 铁基非晶合金微观SEM、TEM形貌及A区基体电子衍射图，B区夹杂物EDS分析及电子衍射图标定

图3 铁基非晶合金在不同浓度FeCl2溶液中的极化曲线

表2 铁基非晶合金在不同浓度的FeCl2溶液中动电位极化实验的电化学参数

图4 铁基非晶合金在不同浓度FeCl2溶液中的腐蚀速率

图5 铁基非晶合金在不同浓度FeCl2溶液中浸泡后的腐蚀形貌

图6 在4 mol/L浓度下浸泡1 h后铁基非晶合金微观形貌分析

图7 极化实验后工作电极表面的SEM形貌

图8 含硫化物夹杂的铁基非晶合金在FeCl2溶液中的点蚀萌生和发展示意图

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