Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第31卷    第2期    总第263期    2021年2月

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文章编号:1004-0609(2021)-02-0298-12
水热反应温度对AZ31镁合金CaAl-LDH膜层结构及耐蚀性的影响
许恒旭1,孙俊丽1,李思远1,侯利锋1,杜华云1,刘宝胜1, 2,卫英慧1

(1. 太原理工大学 材料科学与工程学院,太原 030024;
2. 太原科技大学 材料科学与工程学院,太原 030024
)

摘 要: 采用一步水热法在AZ31镁合金表面上制得CaAl-LDH膜层,采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)、电化学阻抗测试(EIS)、极化曲线等手段研究水热反应温度对CaAl-LDH膜层形貌及性能的影响。结果表明:随着水热反应温度的升高,CaAl-LDH膜层的厚度随之增加,膜层LDH结构的尺寸增大,耐蚀性先增强后减弱;当水热反应温度为120 ℃时,CaAl-LDH膜层的表面最平整致密,层间阴离子为 的加载量最大,离子交换作用最强,膜层的耐蚀性最佳。此时,膜层的电荷转移电阻Rct为9.933×106 Ω?cm2,腐蚀电流密度Jcorr为8.0×10?9 A/cm2。CaAl-LDH膜层的生长模式符合典型的Stranski-Krastanov生长模型。反应温度会影响LDH的结晶速度和生长过程,进而影响了CaAl-LDH膜层的结构和性能。在120 ℃下水热制备CaAl-LDH膜层是提高AZ31镁合金耐蚀性的有效方法。

 

关键字: AZ31镁合金;水热法;CaAl-LDH;耐蚀性;温度

Effect of hydrothermal reaction temperature on structure and corrosion resistance of CaAl-LDH film on AZ31 magnesium alloy
XU Heng-xu1, SUN Jun-li1, LI Si-yuan1, HOU Li-feng1, DU Hua-yun1, LIU Bao-sheng1, 2, WEI Ying-hui1, 2

1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2. College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China

Abstract:A one-step hydrothermal method was used to prepare a CaAl-LDH film on the AZ31 magnesium alloy. X-ray diffractometer (XRD), scanning electron microscope (SEM), energy spectrometer (EDS), electrochemical impedance test (EIS) and polarization curve were used to study the effects of the hydrothermal reaction temperature on the morphology, chemical composition and corrosion resistance of the CaAl-LDH film. The results show that as the hydrothermal reaction temperature increases, the thickness and density of the CaAl-LDH film increase, the sheet size increases, and the corrosion resistance increases first and then decreases. When the hydrothermal reaction temperature is 120 ℃, the surface of the CaAl-LDH film is the most flat and dense, and the loading of anion between layers is the largest, which indicates that the LDH film has the strongest ion exchange effect. So the corrosion resistance of the CaAl-LDH film prepared at 120 ℃ is the best, which charge transfer resistance Rct is 9.933×106 Ω·cm2, corrosion current density Jcorr is 8.0×10-9 A/cm2. The growth mode of CaAl-LDH film conforms to the typical Stranski-Krastanov growth model. The reaction temperature will affect the crystallization speed and growth process of LDH, which in turn affects the structure and performance of CaAl-LDH film. Hydrothermal preparation of CaAl-LDH film at 120 ℃ is an effective method to improve the corrosion resistance of AZ31 magnesium alloy.

 

Key words: AZ31 magnesium alloy; hydrothermal method; CaAl-LDH; corrosion resistance; temperature

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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