ECAP加工与热处理对工业纯铁点蚀行为的影响

doi:10.11868/j.issn.1001-4381.2016.11.011

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摘要

通过多道次等通道转角挤压（ECAP）和退火热处理，制备不同组织结构状态的超细晶工业纯铁，采用透射电镜观察微观组织结构特征，并用电化学极化和阻抗谱技术表征超细晶纯铁在含氯离子的钝化介质中点蚀行为。结果表明：随着ECAP加工道次增加，低道次形成的高位错密度板条状结构转变为低位错密度等轴晶；ECAP样退火热处理后，位错减少、大角度晶界增加。ECAP加工道次对纯铁自钝化性能影响不大，开路电位和极化电阻变化均较小；耐点蚀性能与加工道次有关，点蚀电位随加工道次先下降后升高；退火处理后自钝化性能和耐蚀性提高，开路电位、极化电阻和点蚀电位均明显增大。

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	张留艳
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	余海彬
	吴惠舒

关键词 ：等通道转角挤压, 热处理, 工业纯铁, 点蚀行为

Abstract：

In order to guide a reasonable application of the bulk ultrafine-grained industrial pure iron, a serious of ultrafine-grained pure iron samples with different microstructures were fabricated by multi-passes ECAP and heat-treatment, and their microstructures and pitting corrosion behaviour were investigated by transmission electron microscopy (TEM), electrochemical polarization and impedance spectroscopy (EIS) techniques, respectively. Results show that:with the increase of ECAP passes, lath-shaped structure with high dislocation density transforms into equiaxed grains with low dislocation density; the dislocation density decreases and the high-angle grain boundaries increase, after the annealing treatment. ECAP passes have less effect on the self-passivation of pure iron, and its open circuit potential (OCP) and polarization resistance are less changed; the pitting corrosion resistance of the ECAPed pure iron is related to the ECAP passes:the pitting potential first decreases and then increases with the increase of ECAP passes; the self-passivation property and pitting corrosion resistance of the ECAPed pure iron are improved after the annealing heat-treatment, the OCP, polarization resistance and pitting potential values increase obviously.

Key words： ECAP heat-treatment industrial pure iron pitting corrosion behavior

收稿日期: 2015-01-25 出版日期: 2016-11-22

中图分类号:	TG15
	TG17

基金资助:中国博士后科学基金项目(2014M562149);广东省自然科学基金项目(2015A030310162);广东省科技计划项目(2016A010103034)

通讯作者: 张留艳 E-mail: zlyjust@gdut.edu.cn

作者简介: 张留艳(1983-), 女, 博士后, 博士, 研究方向:材料塑性加工与腐蚀, 联系地址:广州市番禺区广州大学城外环西路100号广东工业大学材料与能源学院(510006), E-mail:zlyjust@gdut.edu.cn

引用本文:

张留艳, 马爱斌, 江静华, 余海彬, 吴惠舒. ECAP加工与热处理对工业纯铁点蚀行为的影响[J]. 材料工程, 2016, 44(11): 66-72.
Liu-yan ZHANG, Ai-bin MA, Jing-hua JIANG, Hai-bin YU, Hui-shu WU. Effect of ECAP and Heat-treatment on Pitting Corrosion Behavior of Industrial Pure Iron. Journal of Materials Engineering, 2016, 44(11): 66-72.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.11.011 或 http://jme.biam.ac.cn/CN/Y2016/V44/I11/66

Fig.1 ECAP加工不同道次纯铁的TEM组织(a)4道次；(b)8道次；(c)12道次；(d)16道次

Fig.2 ECAP加工不同道次纯铁退火处理后的TEM组织(a)4道次；(b)8道次；(c)12道次；(d)16道次

Fig.3 铸态及ECAP加工态纯铁在0.05mol/L NaCl+0.1mol/L NaNO₂溶液中浸泡1h开路电位(a)退火前；(b)退火后

Fig.4 铸态及ECAP加工态纯铁在0.05mol/L NaCl+0.1mol/L NaNO₂溶液中浸泡24 h后电化学阻抗谱(a)退火前；(b)退火后

Fig.5 极化电阻与ECAP加工道次及热处理之间关系

Fig.6 铸态及ECAP加工态纯铁在0.05mol/L NaCl+0.1mol/L NaNO₂溶液中极化曲线(a)退火前；(b)退火后

Fig.7 点蚀电位与ECAP加工道次及热处理之间关系

Fig.8 不同加工态纯铁点蚀形貌(a)铸态；(b) ECAP 8道次；(c) ECAP 8道次+退火；(d) ECAP 16道次；(e) ECAP 16道次+退火

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