摘要
为提高AZ91D镁合金基体的耐蚀性,采用微弧氧化、电沉积和自组装工艺在AZ91D镁合金表面制备了微弧氧化/氧化石墨烯/硬脂酸(MAO/GO/SA)复合涂层。通过SEM对复合涂层的微观组织结构进行了分析,利用电化学阻抗谱、极化曲线测试了复合涂层的耐蚀性能。结果表明,最佳电沉积电压为4 V,此时,MAO/GO复合涂层的电荷转移电阻(Rct)为4.41×10^(5)Ω·cm^(2),腐蚀电流密度(Jcorr)为3.88×10^(-7)A/cm^(2)。醇水比为7∶3时,MAO/GO/SA复合涂层的Rct值为3.07×10^(6)Ω·cm^(2),Jcorr为3.02×10^(-8)A/cm^(2),达到超疏水状态,涂层耐蚀性最好。
To improve the corrosion resistance of AZ91D magnesium alloy substrate,a micro-arc oxidation/graphene oxide/stearic acid(MAO/GO/SA)compound coating was prepared on the surface of AZ91D magnesium alloy using micro-arc oxidation,electrodeposition and self-assembly processes.The microstructure of the compound coating was analyzed by SEM,and the corrosion resistance was tested using electrochemical impedance spectroscopy and polarization curves.The results reveal that the optimal electrodeposition voltage is 4 V,where the Rct value of MAO/GO compound coating is 4.41×10^(5)Ω·cm^(2)and Jcorr is 3.88×10^(-7)A/cm^(2).When the alcohol to water ratio is 7∶3,the Rct value of MAO/GO/SA coating can reach 3.07×10^(6)Ω·cm^(2)and Jcorr is 3.02×10^(-8)A/cm^(2),reaching the super hydrophobic state with the desirable corrosion resistance.
作者
王东
孙世博
孙志浩
姜吉琼
温玉清
尚伟
Wang Dong;Sun Shibo;Sun Zhihao;Jiang Jiqiong;Wen Yuqing;Shang Wei(Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials,College of Chemistry and Bioengineering,Guilin University of Technology)
出处
《特种铸造及有色合金》
CAS
北大核心
2023年第11期1501-1507,共7页
Special Casting & Nonferrous Alloys
基金
广西自然科学基金资助项目(2020GXNSFAA159011)。
关键词
镁合金
复合涂层
工艺条件
耐蚀性
疏水性
Magnesium Alloy
Compound Coating
Process Conditions
Corrosion Resistance
Hydrophobicity
