中性盐雾环境中DC06超深冲钢的腐蚀行为研究

doi:10.11902/1005.4537.2017.174

中国腐蚀与防护学报

2018, Vol. 38

Issue (3): 241-247 DOI: 10.11902/1005.4537.2017.174

研究报告

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中性盐雾环境中DC06超深冲钢的腐蚀行为研究

姚望¹(

), 周和荣¹, 肖葵², 刘鹏洋¹, 但佳永¹, 吴润¹

1 武汉科技大学材料与冶金学院武汉 430081
2 北京科技大学腐蚀与防护教育部重点实验室北京 100083

Corrosion Behavior of DC06 Extra Deep Drawing Cold Rolled Steel in Neutral Salt Spray Test

Wang YAO¹(

), Herong ZHOU¹, Kui XIAO², Pengyang LIU¹, Jiayong DAN¹, Run WU¹

1 School of Material and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
2 Key Laboratory of Corrosionan Protection (MOE), University of Science and Technology Beijing, Beijing 100083, China

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摘要:

采用宏观形貌观察,SEM,XRD和EIS等方法研究了汽车材料DC06超深冲冷轧钢在中性盐雾环境中的腐蚀行为,并分析了其腐蚀机制。结果表明,在中性盐雾实验过程中,DC06超深冲冷轧钢随实验时间的延长,试样表面的腐蚀产物不断增多,腐蚀产物颜色由最初的棕红色变为黑褐色,其表面形貌由针状团簇向棉团状转变;腐蚀产物厚度不断增加,截面有较多的横向及纵向裂纹,腐蚀产物呈现分层且与基材的结合不紧密;腐蚀产物含有Fe₃O₄,α-FeOOH和γ-FeOOH,主要为Fe₃O₄;EIS解析结果显示双电层电阻随实验时间的延长不断降低,其界面腐蚀速率呈增加趋势,且双电层电阻数值较小,腐蚀产物对材料的保护作用不明显。

关键词 ：中性盐雾, 超深冲冷轧钢, 电化学阻抗, 腐蚀层保护性, SEM

Abstract：

The corrosion behavior of the extra deep drawing cold rolled sheet DC06 was assessed by means of neutral slat spray test, electrochemical impedance (EIS) measurement, macro photography, SEM and XRD. It follows that during the neutral slat spray test, the thickness of the corrosion products had increased significantly with the increasing time, and the color of the corrosion products changed from the original brown red to dark brown, while the surface morphology of the corrosion products also changed from needle-like clumps to cotton-like clumps. The corrosion products composed mainly of Fe₃O₄ plus α-FeOOH and γ-FeOOH. The electrical resistance of the electric double layer is decreasing with the test time. The interface corrosion rate increases and double layer resistance value is small. So that the protective effect of corrosion products is not obvious for the substrate steel.

Key words： neutral slat spray test condition extra deep drawing cold rolled sheet electrochemical impedance corrosion layer protection SEM

收稿日期: 2017-10-24

ZTFLH:

TG172.3

基金资助:国家自然科学基金 (50971048) 和科技部科技基础条件平台建设专项

作者简介:

作者简介姚望,男,1991年生,硕士生

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引用本文:

姚望, 周和荣, 肖葵, 刘鹏洋, 但佳永, 吴润. 中性盐雾环境中DC06超深冲钢的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2018, 38(3): 241-247.
Wang YAO, Herong ZHOU, Kui XIAO, Pengyang LIU, Jiayong DAN, Run WU. Corrosion Behavior of DC06 Extra Deep Drawing Cold Rolled Steel in Neutral Salt Spray Test. Journal of Chinese Society for Corrosion and protection, 2018, 38(3): 241-247.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2017.174 或 https://www.jcscp.org/CN/Y2018/V38/I3/241

图1 DC06冷轧板在中性盐雾实验不同时间后的宏观表面形貌

图2 DC06冷轧板在中性盐雾实验后腐蚀产物的微观形貌

图3 DC06冷轧板在中性盐雾实验后的截面形貌图

图4 DC06冷轧板经中性盐雾实验1200 h后表面腐蚀产物的XRD谱

图5 DC06冷轧板中性盐雾实验不同时间的EIS测试结果

图6 DC06冷轧板的阻抗等效电路图

表1 等效电路拟合元件值

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