氮气流量对AZ31B镁合金表面MAO/TiN涂层性能的影响

doi:10.11933/j.issn.1007-9289.20160917001

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中国表面工程 ›› 2017, Vol. 30 ›› Issue (2) : 27-34. DOI: 10.11933/j.issn.1007-9289.20160917001

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表面工程

氮气流量对AZ31B镁合金表面MAO/TiN涂层性能的影响

崔学军,魏劲松,宁闯明,金永中,林修洲

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Effects of Nitrogen Volumetric Flow Rate on Properties of MAO/TiN Composite Coatings on AZ31B Magnesium Alloy

CUI Xue-jun, WEI Jin-song, NING Chuang-ming, JIN Yong-zhong and LIN Xiu-zhou

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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。

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.

导出引用

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 https://doi.org/10.11933/j.issn.1007-9289.20160917001

CUI Xue-jun, WEI Jin-song, NING Chuang-ming, JIN Yong-zhong and 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 https://doi.org/10.11933/j.issn.1007-9289.20160917001

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