Wear and corrosion behavior of clay containing coating on AM 50 magnesium alloy produced by aluminate-based plasma electrolytic oxidation  

等离子体电解氧化AM 50镁合金表面含黏土涂层的磨损与腐蚀行为

作　　者：Farideh DAVOODI Masoud ATAPOUR Carsten BLAWERT Mikhail ZHELUDKEVICH Farideh DAVOODI;Masoud ATAPOUR;Carsten BLAWERT;Mikhail ZHELUDKEVICH(Department of Materials Engineering,Isfahan University of Technology,Isfahan 84156-83111,Iran;MagIC−Magnesium Innovation Centre,Institute of Materials Research,Helmholtz Zentrum Geesthacht,Max-Plank-Str.1,21502 Geesthacht,Germany;Faculty of Engineering,University of Kiel,Kaiserstrasse 2,24143 Kiel,Germany)

机构地区：[1]Department of Materials Engineering,Isfahan University of Technology,Isfahan 84156-83111,Iran [2]MagIC−Magnesium Innovation Centre,Institute of Materials Research,Helmholtz Zentrum Geesthacht,Max-Plank-Str.1,21502 Geesthacht,Germany [3]Faculty of Engineering,University of Kiel,Kaiserstrasse 2,24143 Kiel,Germany

出　　处：《Transactions of Nonferrous Metals Society of China》2021年第12期3719-3738,共20页中国有色金属学报（英文版）

摘　　要：This study aims to examine the effect of clay micro particles addition on the microstructure,wear and corrosion behavior of PEO coatings on AM 50 magnesium alloy.PEO coatings were prepared using an aluminate-based electrolyte with and without the presence of 5 g/L clay particles.The structure and composition of the coatings were evaluated using SEM,EDS and XRD.The wear investigations were conducted using a ball-on-disk tribometer at 2,5 and 10 N loads.The corrosion behavior of the coatings was examined using polarization and EIS tests in 0.5 wt.%NaCl.The results revealed that the addition of clay particles deteriorated the wear resistance of the coatings under the loads of 5 and 10 N.The SEM examinations of the worn surfaces indicated that a combination of adhesive and abrasive wear mechanisms was activated for the coating with clay particles.The poor wear performance of the clay-incorporated coating was related to its lower adhesion strength and higher roughness.The potentiodynamic polarization examinations revealed that the addition of clay particles slightly decreased the corrosion rate of the coatings.Corrosion resistance of the clay-containing coating was attributed to its compactness,as indicated by the results of EIS tests.采用等离子体电解氧化(PEO)在AM 50镁合金表面制备涂层,研究添加黏土微粒对涂层显微组织、磨损和腐蚀行为的影响。采用铝基电解液制备PEO涂层,在电解液中添加5 g/L黏土颗粒,并与未添加的作对比。采用SEM、EDS和XRD对涂层的结构和成分进行表征。磨损测试采用球-盘式摩擦试验机,载荷为2、5和10 N。在0.5%(质量分数)NaCl溶液中,采用极化和电化学阻抗(EIS)实验研究涂层的腐蚀行为。结果表明,在5和10 N载荷下,添加黏土颗粒使涂层的耐磨性下降。磨损表面的SEM结果显示,含有黏土颗粒的涂层其磨损机制为黏着磨损和磨粒磨损。含黏土涂层的磨损性能较差,与涂层的黏结强度较低、粗糙度较高有关。动电位极化实验表明,添加黏土颗粒使涂层的腐蚀速率略微降低。EIS结果表明,含黏土涂层的耐腐蚀性归功于其较好的致密度。

关 键 词：WEAR corrosion clay particles plasma electrolytic oxidation Mg alloys 

分 类 号：TG174.4[金属学及工艺—金属表面处理]