工程科学学报，第40卷，第8期：961-968,2018年8月 Chinese Journal of Engineering,Vol.40,No.8:961-968,August 2018 DOI:10.13374/j.issn2095-9389.2018.08.010;http://journals.ustb.edu.cn 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 孙晓峰区，郝松松，宋巍，李占明，史玉鹏 陆军装甲兵学院装备维修与再制造系，北京100072 区通信作者，E-mail:s9999@126com 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NC1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%NCI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. 关键词石墨烯：涂层：电化学噪声：时域分析：频域分析 分类号TP274.2 Preparation and electrochemical noise characteristics of graphene-composite coating with different contents of 7A52 aluminum alloy matrix SUN Xiao-feng,HAO Song-song,SONG Wei,LI Zhan-ming,SHI Yu-peng Deapartment of Equipment Maintenance and Remanufacturing,Academy of Armored Forces Engineering,Beijing 100072,China Corresponding author,E-mail:sxfl19999@126.com 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 corro- sion 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-cor- rosion 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 re- gion 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 in- creased.After immersion in 3.5%NaCl solution,pits of various severities appear on the aluminum alloy surface,whereas only a small 收稿日期：2017-12-06 基金项目：装备预研共用技术资助项目(41404010203)工程科学学报,第 40 卷,第 8 期:961鄄鄄968,2018 年 8 月 Chinese Journal of Engineering, Vol. 40, No. 8: 961鄄鄄968, August 2018 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2018. 08. 010; http: / / journals. ustb. edu. cn 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 孙晓峰苣 , 郝松松, 宋 巍, 李占明, 史玉鹏 陆军装甲兵学院装备维修与再制造系, 北京 100072 苣 通信作者, E鄄mail: sxfll9999@ 126com 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郾 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:波动范围由小变大寅两者同步波动寅电位缓升急降寅两者波 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郾 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. 关键词 石墨烯; 涂层; 电化学噪声; 时域分析; 频域分析 分类号 TP274郾 2 收稿日期: 2017鄄鄄12鄄鄄06 基金项目: 装备预研共用技术资助项目(41404010203) Preparation and electrochemical noise characteristics of graphene鄄composite coating with different contents of 7A52 aluminum alloy matrix SUN Xiao鄄feng 苣 , HAO Song鄄song, SONG Wei, LI Zhan鄄ming, SHI Yu鄄peng Deapartment of Equipment Maintenance and Remanufacturing, Academy of Armored Forces Engineering, Beijing 100072, China 苣 Corresponding author, E鄄mail: sxfll9999@ 126. com 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 corro鄄 sion process of the modified graphene coating in 3郾 5% NaCl solution. By time鄄domain, statistical time鄄domain, Fourier transform, and frequency鄄domain analyses, the corrosion process was studied in coatings with different graphene鄄composite contents. Based on the change in the electrochemical noise parameters of the coating corrosion conditions, the graphene content that exhibited the best anti鄄cor鄄 rosion 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鄄frequency re鄄 gion 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 in鄄 creased. After immersion in 3郾 5% NaCl solution, pits of various severities appear on the aluminum alloy surface, whereas only a small