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采用控制变量、正交试验法,通过测定膜层厚度、截面显微硬度、表面粗糙度、表面形貌、截面形貌及摩擦磨损试验、膜层表面XRD的分析对制备ZL109铝合金微弧氧化陶瓷层的电解液组成及电参数进行了优化研究。得到了制备ZL109铝合金微弧氧化耐磨陶瓷层的一组优化后的工艺方案,电解液配方为:8 g/L硅酸钠、2.5 g/L氢氧化钾、5 g/L钨酸钠、2 g/L乙二胺四乙酸二钠;电参数为:正向电压400 V、负向电压120 V、占空比20%、频率500 Hz。所生成的膜层厚度为76μm,表面粗糙度为2.2872μm;摩擦磨损试验中,磨损状态稳定,磨损量在30 h后稳定在1 mg左右。
By means of control variables and orthogonal test, the surface micro-arc oxidation of ZL109 aluminum alloy was studied by measuring the film thickness, cross-section microhardness, surface roughness, surface morphology, cross-sectional morphology and friction and wear test, The electrolyte composition and electrical parameters of the ceramic layer were optimized. A series of optimized process schemes for preparing the micro-arc oxidation wear resistant ceramic layer of ZL109 aluminum alloy have been obtained. The electrolyte formulation is as follows: 8 g / L sodium silicate, 2.5 g / L potassium hydroxide, 5 g / L sodium tungstate , 2 g / L disodium ethylenediaminetetraacetate; electrical parameters: forward voltage 400 V, negative voltage 120 V, duty cycle 20%, frequency 500 Hz. The resulting film thickness of 76μm, the surface roughness of 2.2872μm; friction and wear tests, the wear state is stable, the wear amount stabilized at about 1mg after 30 h.