摘要
采用铝酸盐/硅酸盐体系(AS)、铝酸盐/磷酸盐体系(AP)、硅酸盐/磷酸盐体系(SP)和铝酸盐/磷酸盐/硅酸盐体系(APS)的微弧氧化电解液对Mg-Gd-Y-Zn-Mn合金进行微弧氧化(MAO),并在其表面再进行原位生长MgAlLa层状双羟基金属氧化物(MgAlLa-LDHs)得到复合涂层。研究了不同MAO涂层对MgAlLa-LDHs涂层性能的影响,表征了涂层的形貌、结构及成分,并评估了其耐腐蚀性能。结果表明,不同MAO涂层表面生长的MgAlLa-LDHs膜形貌和结构存在明显的差异。此外,APS电解液制备的复合涂层表现出优异的耐腐蚀性能,其腐蚀电流密度为9.14×10^(-9)A·cm^(-2),相较镁合金基体提升了约4个数量级。
Micro-arc oxidation(MAO)surfaces were prepared on a Mg-Gd-Y-Zn-Mn alloy in four dif-ferent electrolytes,namely aluminate/silicate(AS),aluminate/phosphate(AP),silicate/phosphate(SP)and aluminate/phosphate/silicate(APS),afterwards,on which films of layered dihydroxyl metal(MgAlLa)oxides(MgAlLa-LDHs)were in-situ grown to acquire the composite coating of MgAlLa-LDHs/MAOs.Then the effect of different MAO surfaces on the properties of the MgAlLa-LDHs/MAOs composite coatings were studied by means of field emission scanning electron microscopy(FE-SEM),X-ray diffractometer(XRD),energy dispersive spectrometer(EDS)and X-ray photoelectron spectroscopy(XPS),as well as measurements of potentiodynamic polarization,electrochemical impedance and hydrogen evolution etc.in terms of their morphology,microstructure,composition and corrosion behavior in 3.5%NaCl solution.The results show that the different MAO coatings present differences in morphology,phase constituents,number of phases,element distribution and pore size,which affect the in-situ growth of the subsequent MgAlLa-LDHs nanosheets,so that the shape,size and crystallinity of the MgAlLa-LDHs nanosheets are obviously different.In addition,the composite coatings of MgAlLa-LDHs/APS-MAO show excellent corrosion resistance with a corrosion current density 9.14×10^(-9) A·cm^(-2),which is about four orders of magnitude lower than that of the bare Mg-alloy substrate.
作者
吴嘉豪
吴量
姚文辉
袁媛
谢治辉
王敬丰
潘复生
WU Jiahao;WU Liang;YAO Wenhui;YUAN Yuan;XIE Zhihui;WANG Jingfeng;PAN Fusheng(National Engineering Research Center for Magnesium Alloys,College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;National Key Laboratory of Advanced Casting Technologies,Chongqing University,Chongqing 400044,China;State Key Laboratory of Mechanical Transmission,Chongqing University,Chongqing 400044,China;Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province,College of Chemistry and Chemical Engineering,China West Normal University,Nanchong 637002,China)
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2023年第4期693-703,共11页
Journal of Chinese Society For Corrosion and Protection
基金
国家自然科学基金(51971040和52171101)。
关键词
微弧氧化
层状双羟基金属氧化物
电解液
镁合金
耐蚀性
micro-arc oxidation
layered double hydroxyl metal oxide
electrolyte
Mg-alloy
corrosion resistance
