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首页> 外文会议>International Symposium on State-of-the-Art Application of Surface and Interface Analysis Methods to Environmental Material Interactions: in Honor of James E.Castle's 65th Year, Mar 26-27, 2001, Washington D.C. >EFFECT OF SURFACE PRETREATMENTS ON CHROMATE CONVERSION COATINGS
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EFFECT OF SURFACE PRETREATMENTS ON CHROMATE CONVERSION COATINGS

机译：表面预处理对铬酸盐转化膜的影响

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Aluminum alloy AA2024-T3 has been subjected to different pretreatments prior to the conversion coating process. The amount of hexavalent chromium retained in the chromate conversion coating (CCC) formed on AA2024-T3 has been found to depend on the surface condition of the alloy substrate. The pretreated surfaces were analyzed using X-ray Photoelectron Spectroscopy (XPS) to provide insight on the composition of the surface film formed on AA2024-T3 following pretreatments and to compare changes from received condition, occurring due to these pretreatments. The pretreated surfaces were then tested for their corrosion properties in 0.01M NaCl solution using Electrochemical Impedance Spectroscopy (EIS). The ratio of hexavalent chromium in the CCCs have been determined using X-ray Absorption Near Edge Spectroscopy (XANES). The effects of various pretreatments have been discussed with respect to the nature of the native oxide film and the resulting changes in the chromate conversion coatings. An inverse correlation between the polarization resistance of the pretreated surface and hexavalent chromium content in the CCC has been observed.
机译：铝合金AA2024-T3在转换涂层工艺之前已进行了不同的预处理。已发现保留在AA2024-T3上形成的铬酸盐转化膜（CCC）中的六价铬的量取决于合金基材的表面状况。使用X射线光电子能谱（XPS）对经过预处理的表面进行分析，以提供对经过预处理后在AA2024-T3上形成的表面膜成分的了解，并比较由于这些预处理而引起的接收条件的变化。然后使用电化学阻抗谱（EIS）在0.01M NaCl溶液中测试预处理过的表面的腐蚀性能。 CCC中六价铬的比例已使用X射线吸收近边缘光谱法（XANES）确定。关于天然氧化物膜的性质以及铬酸盐转化膜的最终变化，已经讨论了各种预处理的效果。已经观察到预处理表面的抗极化性与CCC中六价铬含量成反比。

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