| 7A52铝合金基体不同含量石墨烯复合涂层的制备及电化学噪声特征分析 |
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| 作者姓名： | 孙晓峰 郝松松 宋巍 李占明 史玉鹏 |
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| 作者单位： | 陆军装甲兵学院装备维修与再制造系,北京,100072;陆军装甲兵学院装备维修与再制造系,北京,100072;陆军装甲兵学院装备维修与再制造系,北京,100072;陆军装甲兵学院装备维修与再制造系,北京,100072;陆军装甲兵学院装备维修与再制造系,北京,100072 |
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| 基金项目： | 装备预研共用技术资助项目（41404010203） |
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| 摘 要： | 将传统涂料与改性石墨烯复合，在7A52铝合金基体上制备防腐性能优良的石墨烯复合涂层.采用电化学噪声技术监测石墨烯改性涂层在质量分数为3.5%的NaCl溶液中的初期腐蚀过程.通过电化学噪声的时域分析、时域统计分析、傅里叶变换、频域分析，对不同石墨烯含量复合涂层的腐蚀过程进行研究，确定石墨烯具有最佳防腐蚀性能含量，根据电化学噪声特征参数的变化对涂层腐蚀情况进行具体研究.结果表明:添加不同含量的改性石墨烯，涂层在一定时间内出现不同程度的电化学噪声；当石墨烯涂层发生腐蚀时，电流电位变化过程为:波动范围由小变大→两者同步波动→电位缓升急降→两者波动范围再次变小.涂层交流阻抗在高频区的阻抗值随改性石墨烯含量的增加而增加；涂层添加改性石墨烯后，涂层腐蚀电位明显正移，自腐蚀电流密度减小，涂层的耐腐蚀性能明显提高；不同石墨烯含量涂层在3.5% NaCl溶液浸泡后铝合金表面出现不同程度点蚀，质量分数1%的石墨烯涂层仅出现少量点蚀坑；结合交流阻抗、极化曲线结果以及铝合金表面腐蚀形貌，综合分析确定石墨烯质量分数为1%时涂层防腐蚀性能最佳.
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| 关 键 词： | 石墨烯 涂层 电化学噪声 时域分析 频域分析 |
| 收稿时间： | 2017-12-06 |
Preparation and electrochemical noise characteristics of graphene-composite coating with different contents of 7A52 aluminum alloy matrix |
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| Affiliation: | Deapartment of Equipment Maintenance and Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072, China |
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| Abstract: | In the harsh marine environment, the traditional aluminum alloy coating has difficulty meeting the requirements of use, which can affect equipment performance. The traditional coating and a modified graphene composite were prepared with a base of 7A52 aluminum alloy, which has excellent anticorrosive properties. Then, the electrochemical noise was recorded to monitor the initial corrosion process of the modified graphene coating in 3.5% NaCl solution. By time-domain, statistical time-domain, Fourier transform, and frequency-domain analyses, the corrosion process was studied in coatings with different graphene-composite contents. Based on the change in the electrochemical noise parameters of the coating corrosion conditions, the graphene content that exhibited the best anti-corrosion performance was determined. The results reveal that for different levels of modified graphene, the electrochemical noise of the coatings differs at certain times. When the graphene coating is corroded, the current potential change process experiences a fluctuation range from small to large and the fluctuation range decreases. It is found that the AC impedance of the coating in the high-frequency region increases with increased modified graphene content. After adding modified graphene to the coating, the corrosion potential of the coating shifts significantly, the corrosion current density decreases, and the corrosion resistance of the coating is significantly increased. After immersion in 3.5% NaCl solution, pits of various severities appear on the aluminum alloy surface, whereas only a small number of pits appear on a 1% graphene coating. By combining the AC impedance results, the polarization curves, and the corrosion morphology of the aluminum alloy surface, the best coating corrosion resistance was observed to occur when the graphene content was 1%. |
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