Although aluminum alloys are widely used in the aerospace industry, their relatively poor wear and corrosion resistance have hampered some applications and reduce the lifetime of the components. In this work, by using a zinc-containing phosphate electrolyte, the corrosion resistance, surface hardness, and wear resistance of the coatings produced by plasma electrolytic oxidation (PEO) are simultaneously improved. The micro-arc discharge is optimized by changing the phosphate concentration instead of introducing hard phase cations to improve the crystallinity of the zinc-doped alumina coating. Our results reveal that by using a concentration of (NaPO₃)₆ of 50 g/L, the hard phase of crystralline alumina and corrosive-resistant phase of Zn₃(PO₄)₂ are produced in concert. In the salt spraying test, the lifetime of the PEO coating is over 5000 h and the electrochemical corrosion current density is reduced by about 2 orders of magnitude confirming the improved corrosion resistance and durability. Moreover, the surface hardness increases from 400 HV for the coating prepared using the conventional phosphate electrolyte to 711.8 HV and the wear rate also drops from 8.5 × 10⁻⁴ mm³·(N·m)⁻¹ to 2.0 × 10⁻⁵ mm³·(N·m)⁻¹. This strategy can guarantee the aluminum alloy PEO coating with simultaneous excellent wear and corrosion resistance to cope with the complex service environment.

尽管铝合金在航空航天工业中得到广泛使用，但是它们相对较差的耐磨性和耐腐蚀性已经阻碍了某些应用并缩短了部件的使用寿命。在这项工作中，通过使用含锌的磷酸盐电解质，通过等离子体电解氧化（PEO）制备的涂层的耐腐蚀性，表面硬度和耐磨性同时得到改善。通过改变磷酸盐浓度而不是引入硬相阳离子来优化微弧放电，以改善掺杂锌的氧化铝涂层的结晶度。我们的结果表明，使用浓度为50 g / L的（NaPO ₃）₆时，结晶铝氧化铝的硬相和Zn ₃（PO ₄）₂是一致生产的。在盐雾试验中，PEO涂层的使用寿命超过5000小时，电化学腐蚀电流密度降低了约2个数量级，从而确认了改进的耐腐蚀性和耐久性。此外，表面硬度从使用常规磷酸盐电解质制备的涂层的400 HV增加到711.8 HV，磨损率也从8.5×10 ^-4  mm ³ ·（N·m）^-1降至2.0×10 ^-5  mm ³ ·（N·m）^-1。这种策略可以确保铝合金PEO涂层同时具有出色的耐磨性和耐腐蚀性，以应对复杂的服务环境。