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在磷酸盐体系中采用恒压微弧氧化工艺对Ti6Al4V(TC4)合金进行微弧氧化,研究了不同氧化时间对微弧氧化膜层的表面形貌、硬度、粗糙度以及物相生成的影响,并对不同氧化时间的膜层耐腐蚀性能进行了测试。结果表明,随着微弧氧化时间的延长,氧化膜表面微孔径增大,膜层厚度与表面硬度值先增加后又降低,膜层由金红石、锐钛矿及钙磷化合物组成,且主晶相为钙磷化合物,金红石及钙磷化合物含量均随微弧氧化时间的延长而增加;微弧氧化膜层表面Ca/P摩尔比值为1.56,接近人体羟基磷灰石比值,O/Ti原子比值为2.0,膜层表面主要组成为Ti O2;微弧氧化膜层腐蚀电位逐渐减小,腐蚀电流逐渐增大。
In the phosphate system, the micro-arc oxidation of Ti6Al4V (TC4) alloy was carried out by constant pressure micro-arc oxidation process. The effects of different oxidation time on the surface morphology, hardness, roughness and phase formation of MAO coatings were investigated. The corrosion resistance of the coatings with different oxidation time was tested. The results show that with the prolongation of micro-arc oxidation time, the pore diameter of the oxide film increases, the film thickness and surface hardness first increase and then decrease, the film consists of rutile, anatase and calcium phosphate compounds, and the main crystal The content of calcium and phosphorus compounds, rutile and calcium-phosphorus compounds increased with the prolongation of micro-arc oxidation time. The molar ratio of Ca / P on the surface of micro-arc oxidation film was 1.56, which was close to the ratio of hydroxyapatite and the O / Ti atomic ratio Is 2.0, the main surface of the film is composed of Ti O2; the corrosion potential of the micro-arc oxidation film is gradually reduced, and the corrosion current is gradually increased.