环境因素对纯Zn在饱和Zn(OH)<sub>2</sub>溶液中腐蚀行为的影响I—Cl<sup>-</sup>浓度和pH值

doi:10.11902/1005.4537.2016.160

中国腐蚀与防护学报

2016, Vol. 36

Issue (6): 522-528 DOI: 10.11902/1005.4537.2016.160

研究报告

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环境因素对纯Zn在饱和Zn(OH)₂溶液中腐蚀行为的影响I—Cl^-浓度和pH值

刘栓¹,周开河²,方云辉²,徐孝忠²,江炯²,郭小平³,郑文茹¹,蒲吉斌^1,³(

),王立平^1,³

1. 中国科学院宁波材料技术与工程研究所中国科学院海洋新材料与应用技术重点实验室浙江省海洋材料与防护技术重点实验室宁波 315201
2 国网浙江省电力公司宁波供电公司宁波 315201
3. 芜湖春风新材料有限公司芜湖 241000

Effect of Environmental Factors on Corrosion Behavior of Zn in Saturated Zn(OH)₂ Solution I—Cl^- Concentration and pH Values

Shuan LIU¹,Kaihe ZHOU²,Yunhui FANG²,Xiaozhong XU²,Jiong JIANG²,Xiaoping GUO³,Wenru ZHEN¹,Jibin PU^1,³(

),Liping WANG^1,³

1. Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Key Laboratory of Marine Materials and Related Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
2. State Grid Zhejiang Electric Power Corporation Ningbo Power Supply Company, Ningbo 315201, China
3. Wuhu Spring New Material Co., Ltd, Wuhu 241000, China

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摘要:

研究纯Zn在模拟大气腐蚀环境 (饱和Zn(OH)₂溶液) 中的初期电化学腐蚀机理。采用极化曲线和电化学阻抗谱,结合扫描电子显微镜,探究Cl^-浓度和pH值对纯Zn在饱和Zn(OH)₂溶液中电化学腐蚀行为的影响。结果表明：Cl^-破坏了锈层结构,诱导点蚀发生,纯Zn的腐蚀速率随着Cl^-浓度的升高而增大。纯Zn在强碱性溶液中处于钝态,其耐蚀性能随着pH值的升高而增大。

关键词 ：纯Zn, 腐蚀行为, Cl^-, pH值

Abstract：

The effect of Cl^- concentration and pH values on the electrochemical corrosion behavior of Zn in saturated Zn(OH)₂ solutions, which aims to simulate the initial atmospheric corrosion environment, was studied by means of polarization curves, electrochemical impedance spectroscopy and scanning electron microscopy (SEM). The results indicated that the corrosion rate of Zn increased with the increase of Cl^- concentration, Cl^- destroyed the rust layer on the electrode, while induced pitting corrosion. Zn was in passive state at high alkaline solution, the corrosion resistance of Zn increased with the increase of pH value.

Key words： pure zinc corrosion behavior Cl^- pH value

基金资助:国家自然科学基金项目 (41506098),中国博士后基金和第九批特等资助项目(2015M580528和2016T90553),浙江省博士后科研项目择优资助项目 (BSH1502160) 和宁波市自然科学基金项目 (2016A610261)资助

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	刘栓
	周开河
	方云辉
	徐孝忠
	江炯
	郭小平
	郑文茹
	蒲吉斌
	王立平
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引用本文:

刘栓,周开河,方云辉,徐孝忠,江炯,郭小平,郑文茹,蒲吉斌,王立平. 环境因素对纯Zn在饱和Zn(OH)₂溶液中腐蚀行为的影响I—Cl^-浓度和pH值[J]. 中国腐蚀与防护学报, 2016, 36(6): 522-528.
Shuan LIU, Kaihe ZHOU, Yunhui FANG, Xiaozhong XU, Jiong JIANG, Xiaoping GUO, Wenru ZHEN, Jibin PU, Liping WANG. Effect of Environmental Factors on Corrosion Behavior of Zn in Saturated Zn(OH)₂ Solution I—Cl^- Concentration and pH Values. Journal of Chinese Society for Corrosion and protection, 2016, 36(6): 522-528.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.160 或 https://www.jcscp.org/CN/Y2016/V36/I6/522

图1 纯Zn在不同pH值饱和Zn(OH)2溶液中的Tafel极化曲线

表1 纯Zn在不同pH值饱和Zn(OH)2溶液中的拟合参数

图2 纯Zn在不同pH值饱和Zn(OH)2溶液中的线性极化曲线以及Rp变化曲线

图3 纯Zn在pH值为8.4和13.0的饱和Zn(OH)2溶液中的循环极化曲线

图4 纯Zn在pH值分别为8.4和13.0的饱和Zn(OH)2溶液中浸泡40 d后的SEM像

图5 纯Zn在不同Cl-浓度饱和Zn(OH)2溶液中浸泡不同时间后的Nyquist和Bode图

图6 纯Zn在不同Cl-浓度饱和Zn(OH)2溶液中的等效电路图

表2 纯Zn在不同Cl-浓度饱和Zn(OH)2溶液中浸泡14 d后的腐蚀参数

图7 纯Zn的Rf和1/Rct在不同Cl-浓度饱和Zn(OH)2溶液中浸泡不同时间后的变化曲线

图8 纯Zn在不同Cl-浓度饱和Zn(OH)2溶液中浸泡14 d后的极化曲线

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