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30卷    第4期    总第253期    2020年4月

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文章编号:1004-0609(2020)-04-0782-11
稀土铈掺杂石墨烯对7050铝合金微弧氧化膜层结构与性能的影响
宗 玙1, 2,宋仁国1, 2,花天顺1, 2,蔡思伟1, 2

(1. 常州大学 材料科学与工程学院,常州 213164;
2. 常州大学 江苏省材料表面科学与技术重点实验室,常州 213164
)

摘 要: 采用微弧氧化(MAO)技术,以硅酸盐为主要电解液成分,通过加入稀土元素铈以及石墨烯添加剂,在7050高强铝合金表面制备微弧氧化膜层。利用扫描电镜(SEM)、体视显微镜、X射线衍射仪(XRD)、摩擦磨损试验机以及电化学工作站研究微弧氧化陶瓷膜层的形貌、粗糙度、相组成和元素分布以及耐磨性和耐蚀性。结果表明:同时加入4 g/L CeO2和10 g/L的石墨烯制备的复合膜层表面微孔尺寸明显降低,结构致密,耐磨性较好,粗糙度最低(1516.03 nm),膜层主要由α-Al2O3和γ-Al2O3组成。且此时的复合膜层自腐蚀电位最大,自腐蚀电流最小,耐腐蚀性最佳。

 

关键字: 7050高强铝合金;微弧氧化;稀土元素;石墨烯;复合膜层

Microstructure and properties of rare earth CeO2-doped graphene composite coatings prepared by MAO on AA7050
ZONG Yu1, 2, SONG Ren-guo1, 2, HUA Tian-shun1, 2, CAI Si-wei1, 2

1. School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China;
2. Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164, China

Abstract:The ceramic coatings were prepared on the surface of 7050 high strength aluminum alloy by micro-arc oxidation process in a silicate electrolyte added with rare earth element cerium or graphene. The surface morphology, roughness, phase composition and distribution of elements, wear resistance and corrosion resistance were analyzed by the scanning electron microscope (SEM), surface profilometer, X-ray diffractometer (XRD), friction-abrasion tester, electrochemical workstation, respectively. The results show that the micro-pore size of the composite coatings which mainly consists of α-Al2O3, γ-Al2O3 decreases and the compactness obviously improves with the simultaneous addition of 4 g/L CeO2 and 10 g/L graphene to the electrolyte. In addition, the roughness is the lowest (1516.03 nm) as well as the wear resistance is significantly improved. The corrosion is the best that the corrosion potential of the coating is the maximum and the corrosion current is the minimum.

 

Key words: 7050 high strength aluminum alloy; micro-arc oxidation; rare earth; graphene; composite coating

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

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

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