石墨烯/硬脂酸超疏水复合膜层的防腐性能

doi:10.11901/1005.3093.2016.617

材料研究学报

2017, Vol. 31

Issue (10): 751-757 DOI: 10.11901/1005.3093.2016.617

研究论文

本期目录 | 过刊浏览

石墨烯/硬脂酸超疏水复合膜层的防腐性能

陈宁宁, 王燕华(

), 钟莲, 杨培培, 王佳

中国海洋大学化学化工学院海洋化学理论与工程技术教育部重点实验室青岛 266100

Anticorrosion Performance of Super-Hydrophobic Complex Film of Graphene/stearic Acid on AZ91 Mg-alloy

Ningning CHEN, Yanhua WANG(

), Lian ZHONG, Peipei YANG, Jia WANG

Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China

引用本文:

陈宁宁, 王燕华, 钟莲, 杨培培, 王佳. 石墨烯/硬脂酸超疏水复合膜层的防腐性能[J]. 材料研究学报, 2017, 31(10): 751-757.
Ningning CHEN, Yanhua WANG, Lian ZHONG, Peipei YANG, Jia WANG. Anticorrosion Performance of Super-Hydrophobic Complex Film of Graphene/stearic Acid on AZ91 Mg-alloy[J]. Chinese Journal of Materials Research, 2017, 31(10): 751-757.

全文: PDF(920 KB) HTML

摘要:

用溶液共混法制备石墨烯/硬脂酸(G/SA)共混溶液,再将其滴涂在微弧氧化后的AZ91镁合金表面制备出超疏水复合膜。用扫描电子显微镜、接触角测量仪和傅立叶红外光谱仪等手段表征了复合膜层的表面形貌、润湿性能以及化学组成,并对微弧氧化膜层和复合膜层进行了阻抗谱和极化测试。结果表明: 石墨烯/硬脂酸共混溶液滴涂后使多孔的超亲水微弧氧化膜层转变为具有微/纳米结构的超疏水复合膜层,静态接触角达到162°;复合膜层的腐蚀电流密度降低了4个数量级,电荷转移电阻增加了4个数量级,且能对镁合金提供有效的腐蚀保护。

关键词 ：材料失效与保护, 镁合金, 微弧氧化, 复合膜层, 超疏水, 腐蚀行为

Abstract：

A super-hydrophobic complex film was prepared on AZ91 Mg-alloy by a two-step process, i.e. first micro-arc oxidizing (MAO) and then applying blended mixture of graphene/stearic acid (G/SA). The surface wettability, morphology and chemical composition of the super-hydrophobic film were characterized by contact angle measurement, scanning electron microscope and FT-IR spectrometer. After applying the G/SA composite, the hydrophilic porous surface of MAO layer could be transformed into a super-hydrophobic one with static contact angle of 162°. In comparison with the bare Mg-alloy, the corrosion current density decreased and the electrochemical impedance increased by four orders of magnitude for the AZ91 alloy with the super-hydrophobic complex film. The high corrosion resistance can be attributed to the high insulation of the MAO film and the blocking effect of graphene.

Key words： materials failure and protection magnesium alloy micro-arc oxidation complex film super-hydrophobic corrosion behavior

收稿日期: 2016-12-19

ZTFLH:

TG174

基金资助:国家自然科学基金(51131005、40906039)、山东省优秀中青年科学家奖励基金(BS2012HZ021)

作者简介:

作者简介陈宁宁,女,1991年生,硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.617 或 https://www.cjmr.org/CN/Y2017/V31/I10/751

图1 各试样的表面形貌和接触角

图2 硬脂酸薄膜和石墨烯/硬脂酸薄膜FTIR图

图3 各试样在3.5 wt.%NaCl溶液中的动电位极化曲线

表1 各试样在3.5%NaCl溶液中的动电位极化电化学参数

图4 各试样在3.5%NaCl溶液中的电化学阻抗Nyquist图

图5 各试样的等效电路图

图6 各试样在3.5%NaCl溶液中的电化学阻抗Bode图

图7 各试样在3.5%NaCl溶液中168 h浸泡前后表面形貌图

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