AZ31镁合金表面超疏水耐腐蚀镍基复合涂层  

Superhydrophobic and Corrosion-resistant Nickel-based Composite Coating on Magnesium Alloy

作　　者：黄志凤 雍奇文 房蕊 谢治辉[1] HUANG Zhifeng;YONG Qiwen;FANG Rui;XIE Zhihui(Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province,College of Chemistry and Chemical Engineering,China West Normal University,Nanchong 637002,China)

机构地区：[1]西华师范大学化学化工学院化学合成与污染控制四川省重点实验室,南充637002

出　　处：《中国腐蚀与防护学报》2023年第4期755-764,共10页Journal of Chinese Society For Corrosion and Protection

基　　金：国家自然科学基金(52271073)。

摘　　要：结合化学沉积和电沉积技术,以动态氢气泡为模板,在AZ31镁合金表面制备了一种超疏水耐腐蚀的镍基复合涂层。涂层形貌、结构、组成、润湿性和腐蚀防护性能的表征结果表明,电沉积溶液中添加ZnO纳米粒子会改变多孔镍层的表面形貌,影响疏水能力。静态水接触角(WCA)测试表明,电沉积溶液中ZnO纳米粒子的浓度为5.0 g·L^(-1)时获得的电沉积镀层经硬脂酸改性后,具有最大的WCA值,达到160.8°±2.8°。相较于裸镁合金,该复合涂层腐蚀电位显著正移,腐蚀电流密度和电荷转移电阻分别降低和提升两个数量级以上,说明复合涂层对镁合金基底具备良好的腐蚀保护能力。The superhydrophobic surface has excellent water repellency,which helps to enhance the corrosion protection performance of the coating.In this work,a superhydrophobic and corrosion-resistant nickel-based composite coating was prepared on the surface of AZ31 Mg-alloy by combining chemical deposition and electrodeposition techniques with dynamic hydrogen bubbles as a template.The microscopic morphology,structure,composition,wettability,and corrosion protection performance of the coating were characterized using scanning electron microscopy(SEM),energy spectrometry(EDS),Xray diffractometer(XRD),Fourier infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS),optical contact angle meter and electrochemical workstation.It was found that adding ZnO nanoparticles to the electrodeposition bath may change the surface morphology of the porous nickel layer and affect its hydrophobicity.The static water contact angle(WCA)tests revealed that the highest WCA value of 160.8°±2.8°was acquired for the composite coating prepared by electrodeposition in the electrolyte containing ZnO nanoparticles of 5.0 g·L^(-1)and then modified by stearic acid.Compared to the bare Mg-alloy,the composite coating􀆳s corrosion potential was positively shifted by-1.23 V to-0.32 V.The corrosion current density and charge transfer resistance were reduced and increased by more than two orders of magnitude,reaching 8.4110-7 A·cm^(-2)and 72.79 kΩ·cm^(2)respectively,indicating the good corrosion protection ability of the composite coating to the Mg-alloy.

关 键 词：镁合金 镍镀层 纳米氧化锌 电沉积 超疏水 

分 类 号：TG174[金属学及工艺—金属表面处理]