绿色缓蚀剂SDDTC对AZ31B镁合金的缓蚀作用及吸附行为

doi:10.11902/1005.4537.2016.253

中国腐蚀与防护学报

2018, Vol. 38

Issue (1): 62-67 DOI: 10.11902/1005.4537.2016.253

本期目录 | 过刊浏览

绿色缓蚀剂SDDTC对AZ31B镁合金的缓蚀作用及吸附行为

王海媛¹, 卫英慧^1,²(

), 杜华云¹, 刘宝胜¹, 郭春丽¹, 侯利锋¹

1 太原理工大学材料科学与工程学院太原 030024
2 山西工程技术学院阳泉 045000

Corrosion Inhibition and Adsorption Behavior of Green Corrosion Inhibitor SDDTC on AZ31B Mg-alloy

Haiyuan WANG¹, Yinghui WEI^1,²(

), Huayun DU¹, Baosheng LIU¹, Chunli GUO¹, Lifeng HOU¹

1 College of Materials Science and Engineering, TaiYuan University of Technology, Taiyuan 030024, China
2 Shanxi Institute of Technology, Yangquan 045000, China

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摘要:

采用极化曲线、电化学阻抗谱、红外光谱及扫描电镜等方法研究了二乙基二硫代氨基甲酸钠 (SDDTC) 对AZ31B镁合金在3.5% (质量分数) NaCl溶液中的缓蚀作用及吸附行为。结果表明,SDDTC能有效抑制AZ31B镁合金在NaCl介质中的腐蚀,属阴极抑制为主的混合型缓蚀剂。当SDDTC浓度为5 mmolL^-1时,缓蚀效果最好。SDDTC在AZ31B镁合金表面发生物理吸附,符合Langmuir吸附模型。吸附在表面的SDDTC形成较为致密的保护膜,有效抑制了AZ31B镁合金的腐蚀。

关键词 ： AZ31B镁合金, 二乙基二硫代氨基甲酸钠, NaCl溶液, 缓蚀作用

Abstract：

The corrosion inhibition and adsorption behavior of sodium diethyldithiocarbamate (SDDTC) on AZ31B Mg-alloy in 3.5% (mass fraction) NaCl solution were investigated by means of potentiodynamic polarization measurement, electrochemical impedance spectroscopy (EIS), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). Results showed that SDDTC could inhibit effectively the corrosion for AZ31B Mg-alloy in NaCl solution, and acted as a mixed-type inhibitor with predominant control of the cathodic reaction. When the concentration of SDDTC was 5 mmolL^-1, the inhibition efficiency was the best. The physical adsorption of SDDTC on the AZ31B Mg-alloy surface obeyed the Langmuir adsorption isotherm. While SDDTC adsorbed on the surface of Mg-alloy forms a much compact protective film, effectively inhibiting the corrosion of AZ31B Mg-alloy.

Key words： AZ31B Mg-alloy sodium diethyldithiocarbamate (SDDTC) NaCl solution corrosion inhibition

收稿日期: 2017-01-03

ZTFLH:

TG174.4

基金资助:国家自然科学基金 (51374151),山西省重点科研项目 (MC2016-06和201603D111004) 及山西省归国留学基金(2017-029)

作者简介: 作者简介王海媛,女,1990年生,硕士生

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引用本文:

王海媛, 卫英慧, 杜华云, 刘宝胜, 郭春丽, 侯利锋. 绿色缓蚀剂SDDTC对AZ31B镁合金的缓蚀作用及吸附行为[J]. 中国腐蚀与防护学报, 2018, 38(1): 62-67.
Haiyuan WANG, Yinghui WEI, Huayun DU, Baosheng LIU, Chunli GUO, Lifeng HOU. Corrosion Inhibition and Adsorption Behavior of Green Corrosion Inhibitor SDDTC on AZ31B Mg-alloy. Journal of Chinese Society for Corrosion and protection, 2018, 38(1): 62-67.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.253 或 https://www.jcscp.org/CN/Y2018/V38/I1/62

图1 AZ31B镁合金在含不同浓度SDDTC的3.5%NaCl溶液中的极化曲线

表1 AZ31B镁合金在含不同浓度SDDTC的3.5%NaCl溶液中的极化曲线拟合参数以及浸泡前后溶液的pH值变化

图2 AZ31B镁合金在含不同浓度SDDTC的3.5%NaCl溶液中的阻抗谱

图3 AZ31B镁合金在未添加和添加缓蚀剂的3.5%NaCl溶液中的等效电路图

表2 AZ31B镁合金在含不同浓度SDDTC的3.5%NaCl溶液中的电化学阻抗谱拟合参数

图4 AZ31B镁合金在添加SDDTC的3.5%NaCl溶液中的Langmuir吸附等温线

图5 AZ31B镁合金在未添加及添加5.0 mmolL-1 SDDTC的3.5%NaCl溶液中浸泡3 d后的红外光谱

图6 AZ31B镁合金在未添加及添加5.0 mmolL-1 SDDTC的3.5%NaCl溶液中浸泡3 d后表面的SEM像

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