酸性介质中HR-2不锈钢表面活性的SECM三维图像表征研究

中国腐蚀与防护学报

2013, Vol. 33

Issue (1): 54-60

技术报告

本期目录 | 过刊浏览

酸性介质中HR-2不锈钢表面活性的SECM三维图像表征研究

陈阵¹ ,余强¹ ,廖登辉² ,郭忠诚² ,武剑² ,罗智珊¹

1. 昆明理工大学理学院昆明 650093;
2. 昆明理工大学冶金与能源工程学院昆明 650093

Surface Activity of HR-2 Stainless Steel in Acid Solution with SECM

CHEN Zhen¹, YU Qiang¹, LIAO Denghui²,GUO Zhongcheng², WU Jian², LUO Zhishan¹

1. Faculty of Science, Kunming University of Science and Technology, Kunming 650093, China;
2. Faculty of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China

全文: PDF(9274 KB)

摘要:

采用扫描电化学显微镜（SECM），面扫描与线性扫描技术相结合，研究了HR-2不锈钢在0.5 mol/L H₂SO₄+0.1 mol/L NaCl溶液中的腐蚀行为。结果表明：HR-2不锈钢在该溶液中的开路电位、活化电位及钝化区电位分别为：-0.4 V、-0.23 V、0.0 V ~ 0.8 V，基底保持开路电位和活化电位时，探头最大电流为9.5 nA和35.2 nA，基底形成钝化膜后探头电流明显减小；当探头电位为-0.2 V时能有效氧化基底产生的H₂，0.6 V时能有效氧化基底反应产生的Fe₂₊，探头-基底间距为20 μm时，可较好地表征基底活性；当溶液中硫脲浓度为0.75 mmol/L时，有最佳的缓蚀作用。

关键词 ：扫描电化学显微镜, HR-2不锈钢, 探头电位, 探头电流

Abstract：

By surface scanning technology and linear scanning technology with SECM, which have a micrometer pixel, corrosion behavior of HR-2 stainless steel in 0.5 mol/L H₂SO₄+0.1 mol/L NaCl solution was studied. The results show that: open circuit potential, activation potential, and passivation potential are -0.4 V, -0.23 V, 0.0 V ~ 0.8 V relatively. The maximum current of probe is 9.5 nA when substrate current is open circuit potential 35.2nA, when substrate current is activation potential. When passive film formed on the substrate, the current of probe largely decreased. H₂ was obtained when current of probe is -0.2 V, Fe₂₊ was obtained when current of probe is 0.6 V. It is also observed that the proper distance between probe and substrate is 20 μm, and best concentration of the corrosion inhibition (sulfocarbamide) is 0.75 mmol/L.

Key words： SECM HR-2 stainless steel probe potential probe current

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引用本文:

陈阵,余强,廖登辉,郭忠诚,武剑,罗智珊. 酸性介质中HR-2不锈钢表面活性的SECM三维图像表征研究[J]. 中国腐蚀与防护学报, 2013, 33(1): 54-60.
CHEN Zhen, YU Qiang, LIAO Denghui, GUO Zhongcheng, WU Jian, LUO Zhishan. Surface Activity of HR-2 Stainless Steel in Acid Solution with SECM. Journal of Chinese Society for Corrosion and protection, 2013, 33(1): 54-60.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2013/V33/I1/54

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