铜络合物对钛合金表面微弧氧化陶瓷膜的影响

he present works focuses on the in?uence of copper complexes in the MAO electrolyte on the structure and wear resistance of ceramic coating on the surface of titanium alloy. [Cu(NH3)4]2+ and EDTA-Cu were added into the aluminate-based composite electrolyte. The coatings' composition was characterized using X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS), and their morphologies were examined using SEM. Research shows that the working voltage of MAO reaction was lower after adding [Cu(NH3)4]2+ than adding EDTA-Cu. The color of ceramic coating is black (prepared in the electrolyte with [Cu(NH3)4]2+) and brown (prepared in the electrolyte with EDTA-Cu). The SEM pictures show that size of micropores on the brown coating surface was smaller while the number of micropores was larger than black coating. In addition to the substrate Ti, the black coating contained rutile TiO2, anatase TiO2 and aluminium titanate (Al2TiO5), while the brown coating contained rutile and anatase only. The EDS results show that the coatings contained copper and the copper presented in the form of CuO. Friction and wear tests indicate that the black coating which contained CuO compound was found to outperform brown coating in wear resistance.