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首页> 外文期刊>Surface & Coatings Technology >Effect of frequency on black coating formation on AZ31 magnesium alloy by plasma electrolytic oxidation in aluminate-tungstate electrolyte
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Effect of frequency on black coating formation on AZ31 magnesium alloy by plasma electrolytic oxidation in aluminate-tungstate electrolyte

机译：AZ31镁合金对黑色涂层形成对氧化铝电解质氧化铝电解质的影响

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摘要

Plasma electrolytic oxidation (PEO) has been carried out under unipolar and bipolar pulsed current regimes to investigate the formation of black ceramic coatings on AZ31 magnesium alloy in an aluminate-tungstate electrolyte at frequencies of 100, 1000 and 2000 Hz. The coatings were characterized by scanning electron microscopy (SEM) assisted by energy dispersive X-ray spectroscopy (EDS), and micro-discharges were investigated by real-time imaging and photomultiplier methods. Coating color was quantified by the CIELAB method. Blackness of coatings increased with frequency and tungsten incorporation, with blackest coatings obtained under unipolar conditions. Blacker coatings also revealed increased roughness and large internal pores, which were attributed to stronger plasma discharges and greater gas evolution. Continuing light emission after termination of each anodic current pulse suggested that sites of high coating temperature may facilitate discharge initiation in the subsequent anodic pulse when the cycle time is short. Large porosity and increased voltage indicated cathodic discharges also occur at high frequency when the coating is sufficiently thick. However, it seems that the cathodic discharges have no effect on the blackness of the coating.
机译：等离子体电解氧化（PEO）已经在单极和双极脉冲电流制度下进行，以研究100,1000和2000Hz频率的铝酸盐 - 钨电解质中的AZ31镁合金上的黑陶瓷涂层的形成。通过扫描电子显微镜（SEM），通过能量分散X射线光谱（EDS）辅助涂层，通过实时成像和光电倍增方法研究微放电。涂层颜色通过CIELAB方法量化。用频率和钨掺入增加涂层的黑色，在单极条件下获得最黑的涂层。 Blacker涂层还透露了粗糙度增加和大的内部孔隙，这归因于较强的等离子体放电和更大的气体进化。每个阳极电流脉冲终止后继续发光，表明当循环时间短时，高涂覆温度的位点可以促进随后的阳极脉冲中的放电启动。当涂层足够厚时，大孔隙率和增加的电压也在高频时发生的阴极放电。然而，似乎阴极放电对涂层的黑色没有影响。

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