Corrosion protection investigations of carbon dots and polydopamine composite coating on magnesium alloy  

作　　者：H.D.Zhang A.Y.Chen B.Gan H.Jiang L.J.Gu 

机构地区：[1]School of Material Science&Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China [2]Beijing Key Laboratory of Advanced High Temperature Materials,Central Iron and Steel Research Institute,Beijing 100081,China

出　　处：《Journal of Magnesium and Alloys》2022年第5期1358-1367,共10页镁合金学报（英文）

基　　金：National Natural Science Foundation of China(grants 51771121);the fund provided by Science and Technology Committee of Shanghai Municipality(20ZR1437500);financial supports from Shanghai Municipal Education Commission(2019-01-07-00-07-E00015)。

摘　　要：A composite coating of nitrogen-doped carbon dots(N–CDs)and polydopamine(PDA)was prepared on magnesium alloy by combining electrodeposition with dip coating methods.The microstructure of the N–CDs/PDA composite coating,including composition,surface morphology,and crystalline structure,is characterized by Raman spectroscopy,scanning electron microscopy,transmission electron microscopy,and X-ray photoelectron spectroscopy,respectively.The corrosion protection performances of the composite coating are evaluated by potentiodynamic polarization tests,electrochemical impedance spectroscopy,and salt spray tests.The effect of the particle size of the N–CDs on the corrosion performance is also investigated.The results show that the corrosion performance of the N–CDs coatings are enhanced with the increase of the particle sizes.Furthermore,an obvious self-healing performance is observed on the surface of the N–CDs/PDA composite coating.These results indicate that N–CDs/PDA composite coating can improve the corrosion performance of the Mg alloy,and open a new design direction for the protective coating of metallic materials.

关 键 词：Magnesium alloy N-doped carbon dots Particle size DOPAMINE Coating Corrosion resistance 

分 类 号：TG174.4[金属学及工艺—金属表面处理]