Effect of Various Additives on Performance of Plasma Electrolytic Oxidation Coatings Formed on AZ31 Magnesium Alloy in the Phosphate Electrolytes  

作　　者：庄俊杰 宋仁国 LI Hongxia XIANG Nan 

机构地区：[1]School of Materials Science and Engineering, Changzhou University [2]Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University [3]Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University [4]College of Materials and Environmental Engineering, Hangzhou Dianzi University

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2018年第3期703-709,共7页武汉理工大学学报（材料科学英文版）

基　　金：Funded by National Natural Science Foundation of China(No.51371039);Zhejiang Provincial Natural Science Foundation of China(No.LGG18E020004);Open Foundation of Zhejiang Provincial Top Key Discipline of Mechanical Engineering;Science and Technology Project of Zhejiang Province(No.2015C37037)

摘　　要：Plasma electrolytic oxidation（PEO） coatings were prepared on AZ31 magnesium alloy using alkaline phosphate as base electrolyte system, and with the addition of sodium silicate（Na2SiO3）, sodium aluminate（NaAlO2） and potassium fluorozirconate（K2ZrF6） as additives. The microstructure, phase composition and element composition as well as surface profile of the PEO coatings were analyzed by means of scanning electron microscopy（SEM）, X-ray diffraction（XRD）, energy dispersive X-ray spectroscopy（EDS）, and threedimensional（3 D） optical profilometry. The corrosion and wear properties were evaluated by electrochemical potentiodynamic polarization in 3.5 wt% Na Cl solution and ball-on-disc wear tests, respectively. The results showed that the anions of the additives effectively participated in the coating formation influencing its microstructural features, chemical composition, corrosion resistance and tribological behaviour. It was observed that the sample treated by PEO in the electrolyte solution containing K2ZrF6 as an additive showed better corrosion and abrasive resistance.Plasma electrolytic oxidation（PEO） coatings were prepared on AZ31 magnesium alloy using alkaline phosphate as base electrolyte system, and with the addition of sodium silicate（Na2SiO3）, sodium aluminate（NaAlO2） and potassium fluorozirconate（K2ZrF6） as additives. The microstructure, phase composition and element composition as well as surface profile of the PEO coatings were analyzed by means of scanning electron microscopy（SEM）, X-ray diffraction（XRD）, energy dispersive X-ray spectroscopy（EDS）, and threedimensional（3 D） optical profilometry. The corrosion and wear properties were evaluated by electrochemical potentiodynamic polarization in 3.5 wt% Na Cl solution and ball-on-disc wear tests, respectively. The results showed that the anions of the additives effectively participated in the coating formation influencing its microstructural features, chemical composition, corrosion resistance and tribological behaviour. It was observed that the sample treated by PEO in the electrolyte solution containing K2ZrF6 as an additive showed better corrosion and abrasive resistance.

关 键 词：magnesium alloy plasma electrolytic oxidation additives microstructure corrosion resistance 

分 类 号：TG174.451[金属学及工艺—金属表面处理]