Passive films were formed on A508-3 steel (A508-3), 304L stainless steel (304L) and Incoloy 800 (In800) with blank/zinc/zinc–aluminum treatments in air at 300 °C. The electrochemical corrosion behaviors of different metals were investigated through potentiodynamic polarization, electrochemical impedance spectroscopy and the Mott–Schottky technique. The morphology and composition of passive films were analyzed using scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). The zinc–aluminum treatment effectively reduced the corrosion current and increased the impedance of A508-3 and 304L, but had a weak effect on In800. The zinc–aluminum treatment reduced the carrier concentration of A508-3 and changed the semiconductor property of 304L and In800. The order of zinc–aluminum treatment for improving the corrosion resistance of three metals was: A508-3 > 304L > In800. In addition, the zinc–aluminum treatment enhanced the density and smoothness of passive films. According to the composition analysis, spinel ZnAl₂O₄ was formed on three metals; however, the amount of spinel varied with the content of nickel and chromium in different metals, which affected the results of using this technology.

中文翻译：

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锌铝同时处理改性钝化膜对不同金属的腐蚀行为和形貌

在300°C的空气中，对A508-3钢（A508-3），304L不锈钢（304L）和Incoloy 800（In800）进行空白/锌/锌-铝处理，形成了钝化膜。通过电位动力学极化，电化学阻抗谱和Mott–Schottky技术研究了不同金属的电化学腐蚀行为。使用扫描电子显微镜（SEM）和能量色散光谱（EDS）分析了钝化膜的形态和组成。锌铝处理可有效降低腐蚀电流并增加A508-3和304L的阻抗，但对In800的影响较弱。锌铝处理降低了A508-3的载流子浓度，并改变了304L和In800的半导体性能。锌铝处理可提高三种金属的耐蚀性的顺序为：A508-3> 304L> In800。另外，锌铝处理提高了钝化膜的密度和光滑度。根据成分分析，尖晶石为ZnAl在三种金属上形成₂ O ₄。但是，尖晶石的含量随不同金属中镍和铬的含量而变化，这影响了使用该技术的结果。