镀锌层表面钝化膜在5% NaCl溶液中的腐蚀降解过程和半导体行为
Corrosion Degradation Process and Semiconducting Behavior of Passivation Film on Zinc Coating in 5% NaCl Solution
摘 要
采用扫描电化学显微镜（SECM）分析技术、电化学阻抗谱（EIS）和电容-电位测试研究了镀锌层表面钝化膜在质量分数5% NaCl溶液中的腐蚀降解过程和半导体行为。结果表明: 浸泡过程中随着水和离子逐渐侵入钝化膜，钝化膜发生着缓慢的腐蚀降解，钝化膜在浸泡初期保持稳定，能够对基体金属起到较好的保护作用; 钝化膜表现出n型半导体特征，随着浸泡时间的延长，Mott-Schottky曲线拟合直线的斜率逐渐减小，钝化膜载流子密度逐渐增大，表明钝化膜在浸泡过程中发生缓慢的腐蚀降解。
钝化膜
腐蚀降解
Mott-Schottky曲线
scanning electrochemical microscopy (SECM)
passivation film
corrosion degradation
Mott-Schottky curve
Abstract
The corrosion degradation process and semiconducting character of passivation film on the surface of zinc coating were examined in 5% (mass) NaCl solution by means of scanning electrochemical microscopy (SECM), electrochemical impedance spectroscopy (EIS) and potential-capacitance measurement. The results show that as water and ions gradually invaded into the coating, the passivation film was under slow corrosion degradation. The passivation film kept stable and provided good protection for substrate during the early immersion in corrosion electrolyte. The passivation film showed the characteristics of n-type semiconductor. With the increase of immersion time, the slope of Mott-Schottky curves dropped and the carrier density rose, reflecting that the passivation film was under slow corrosion degradation in immersion process.
中图分类号 TG174.4 DOI 10.11973/fsyfh-201612006
所属栏目 试验研究
基金项目 南通市产学研协同创新项目(BC201410)
收稿日期 2015/8/16
修改稿日期
网络出版日期
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备注钟庆东(1969 - ), 教授，博士
引用该论文: ZHANG Jun-liang,ZHAO Qi-liang,ZHONG Qing-dong,GUO Wei. Corrosion Degradation Process and Semiconducting Behavior of Passivation Film on Zinc Coating in 5% NaCl Solution[J]. Corrosion & Protection, 2016, 37(12): 973
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【4】MONTEMOR M F,FERREIRA M G S. Analytical characterization of silane films modified with cerium activated nanoparticles and its relation with the corrosion protection of galvanised steel substrates[J]. Progress in Organic Coatings,2008,63(3):330-337.
【5】卢琳,李晓刚,高瑾. 有机涂层/金属界面腐蚀的微区电化学[J]. 化学进展,2011,23(8):1618-1626.
【6】骆鸿,魏丹,董超芳,等. 金属腐蚀微区电化学研究进展（1）扫描电化学显微镜技术[J]. 腐蚀与防护,2009,30(7):437-441.
【7】卢小泉,王晓强,胡丽娜. 扫描电化学显微镜及其在界面电化学研究中的应用[J]. 化学通报,2004,67(9):673-678.
【8】曹发和,夏妍,刘文娟,等. SECM基本原理及其在金属腐蚀中的应用[J]. 电化学,2013(5): 393-401.
【9】SOUTO R M,GONZLEZ-GARCA Y,GONZLEZ S. Evaluation of the corrosion performance of coil-coated steel sheet as studied by scanning electrochemical microscopy[J]. Corrosion Science,2008,50(6):1637-1643.
【10】BASTOS A C,SIM01ES A M. Application of the scanning electrochemical microscope to the examination of organic coatings on metallic substrates[J]. Progress in Organic Coatings,2005,53(3):177-182.
【11】HAMADA T,NOMURA H. Direct current resistivi-ty of degraded organic film for pre-coat metal[J].Progress in Organic Coatings,1999,37(3):141-148.
【12】王超,钟庆东,周国治,等. 环氧树脂/碳钢电极在硫酸溶液中的半导体导电行为[J]. 物理化学学报,2008,24(7):1277-1282.
【13】王超,盛敏奇,钟庆东,等. 碳钢/醇酸涂层在5% NaCl溶液中的极化及半导体行为[J]. 化学学报,2009,67(8):709-715.
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【18】ALVES V A,BRETT C M A. Characterisation of passive films formed on mild steels in bicarbonate solution by EIS[J]. Electrochimica Acta,2002,47(13):2081-2091.
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