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[目的]在电解液中同时添加平均粒径均为3～5μm的hBN(六方氮化硼)和cBN(立方氮化硼)颗粒，通过微弧氧化(MAO)技术在TC6钛合金表面制备复合氧化膜，以提升其耐磨性和耐蚀性。[方法]采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、动电位极化曲线测试和球-盘磨损试验研究了hBN/cBN颗粒含量比(二者总质量浓度为3 g/L)对MAO膜层组织结构、耐蚀性及耐磨性的影响。[结果]多数hBN和cBN颗粒以熔融态形式存在于复合MAO膜层中，少量以颗粒的形式粘附在表面或填充到微孔中，还有部分分解并生成MoN、MoB等增强相。相比于无颗粒的MAO膜层，hBN/cBN颗粒复合MAO膜层具有更好的致密性和更高的显微硬度，因此具有更佳的耐磨性和耐蚀性。当hBN/cBN含量比为1∶2时复合MAO膜层的显微硬度最高，达1 228 HV。当hBN/cBN含量比为2∶1时所得复合MAO膜层的综合性能最佳，摩擦因数为0.35且波动较小，比磨损率为无颗粒MAO膜层的50%，腐蚀电流密度低1个数量级。[结论]hBN/cBN颗粒复合微弧氧化可显著提升TC6钛合金的耐磨性和耐蚀性，其中较佳的hBN与cBN质量浓度比为2∶1。
Abstract：[Objective] To enhance the wear and corrosion resistance of TC6 titanium alloy, composite oxide coatings were prepared via micro-arc oxidation(MAO) in an electrolyte containing both hexagonal boron nitride(coded as hBN)and cubic boron nitride(coded as cBN) particles with an average particle size of 3-5 μm. [Method] The effects of hBNto-cBN content ratio(total mass concentration fixed at 3 g/L) on the microstructure, corrosion resistance, and wear resistance of MAO coatings were studied by scanning electron microscopy(SEM), X-ray diffraction(XRD),potentiodynamic polarization test, and ball-on-disk wear test. [Result] Most of the hBN and cBN particles in composite MAO coating existed in a molten state, while a small fraction adhered to the surface, filled the micropores, or decomposed to form reinforcing phases such as MoN and MoB. Compared to the particle-free MAO coating, the hBN/cBN-containing composite MAO coating exhibited superior compactness and higher microhardness, resulting in significant improvement in wear and corrosion resistance. The highest microhardness(about 1 228 HV) was achieved at hBN-to-cBN content ratio of 1:2. The composite MAO coating obtained at hBN-to-cBN content ratio of 2:1 featured the best overall performance:stable friction coefficient of 0.35, a specific wear rate only half of the particle-free coating, and one order of magnitude reduction in corrosion current density. [Conclusion] The hBN/cBN-containing composite MAO coating significantly enhances the wear and corrosion resistance of TC6 titanium alloy, with the optimal hBN-to-cBN mass ratio being 2:1.
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基本信息:
DOI：10.19289/j.1004-227x.2025.06.011
中图分类号:TG174.4
引用信息:
[1]于东岳,庞志伟,张鲜君等.TC6钛合金表面hBN/cBN颗粒复合微弧氧化膜的微观结构及性能[J].电镀与涂饰,2025,44(06):68-75.DOI:10.19289/j.1004-227x.2025.06.011.
基金信息:
国家自然科学基金（52261019）