引用本文:崔学军,魏劲松,宁闯明,金永中,林修洲.氮气流量对AZ31B镁合金表面MAO/TiN涂层性能的影响[J].中国表面工程,2017,30(2):27~34
CUI Xue-jun,WEI Jin-song,NING Chuang-ming,JIN Yong-zhong,LIN Xiu-zhou.Effects of Nitrogen Volumetric Flow Rate on Properties of MAO/TiN Composite Coatings on AZ31B Magnesium Alloy[J].China Surface Engineering,2017,30(2):27~34
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氮气流量对AZ31B镁合金表面MAO/TiN涂层性能的影响
崔学军1,2, 魏劲松1, 宁闯明1, 金永中1, 林修洲1
1.四川理工学院 材料科学与工程学院, 四川 自贡 643000;2.山东省科学院新材料研究所 山东省轻质高强金属材料重点实验室, 济南 250014
摘要:
为了提高镁合金的装饰性及耐腐抗磨性能，采用微弧氧化（MAO）和多弧离子镀技术制备了MAO/TiN复合涂层。利用SEM、XRD、纳米压痕仪及电化学工作站等考察氮气（N2）流量对涂层结构及性能的影响。结果表明：随着N2流量的增加，TiN涂层的颜色由淡黄色到金黄色再到红黄色变化，涂层表面的熔滴粒子数量增多，大尺寸颗粒数量减少，膜层更致密；涂层硬度和耐腐抗磨性能先增大后降低；当N2流量为130 mL/min时，涂层表现出较高的硬度（13.6 GPa）、较低的磨损量（0.8 mg）和自腐蚀电流密度（约1.6 μA/cm2）。N2流量通过控制涂层中N/Ti原子的比例决定了涂层的颜色、微结构、物相组成及性能，涂层内部的孔隙、微裂纹等结构缺陷是导致涂层耐腐抗磨性能较差的关键因素。
关键词:  镁合金  微弧氧化  多弧离子镀  氮化钛  装饰涂层
DOI：10.11933/j.issn.1007-9289.20160917001
分类号:
基金项目:四川省科技支撑计划（2016JZ0032）；四川省教育厅重点项目（16ZA0244）；山东省轻质高强金属材料重点实验室开放基金（2016sdlsm001）
Effects of Nitrogen Volumetric Flow Rate on Properties of MAO/TiN Composite Coatings on AZ31B Magnesium Alloy
CUI Xue-jun1,2, WEI Jin-song1, NING Chuang-ming1, JIN Yong-zhong1, LIN Xiu-zhou1
1.School of Materials Science and Engineering, Sichuan University of Science and Engineering, Zigong 643000, Sichuan;2.Shandong Key Laboratory for High Strength Lightweight Metallic Materials, Advanced Materials Institute, Shandong Academy of Sciences, Jinan 250014
Abstract:
To improve the decorativeness, corrosion and wear resistance of magnesium (Mg) alloys, an MAO/TiN composite coating was prepared through combing the micro-arc oxidation (MAO) with multi-arc ion plating on AZ31B Mg alloy. The effects of N2 volumetric flow rate on the structure and properties of the coating were investigated using SEM, XRD, nano-meter indentation tester and electrochemical test system. The results indicate that with N2 increasing, the color of TiN layer is changed from light yellow to gold yellow and finally brownish red; the droplet particle is increased in number but the particles with larger size are reduced; and the coating becomes more denser. These cause the hardness, corrosion and wear resistance of the coating to increase first and then decrease. The coating presente higher hardness (13.6 GPa), lower wear rate (0.8 mg) and corrosion current density (1.6 μA/cm2) at 130 mL/min. The rate of N/Ti atoms is tailored through the N2 flow rate, so it can be concludes that the N2 flow rate should be responsible for the color, micro-structure, phase composition, corrosion and wear resistance of the coating. The defects like pores and cracks are playing key roles in the poor corrosion and wear resistance.
Key words:  magnesium alloys  plasma electrolytic oxidation  multi-arc ion plating  titanium nitride  decorative coating
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