Abstract

Effects of concentration (2.0, 4.0, 7.0 and 11.0 vol %) and operating temperature (20.0, 40.0 and 60.0°C) on phosphate coatings formed on aluminum (AA1050) surfaces by cathodic electrochemical polarization (0.1, 0.4 and 0.6 A dm^–2) in solutions containing ammonium and sodium phosphates, \({\text{MoO}}_{4}^{{2 - }}\) promoting ions, inorganic activators, buffers, softeners, as well as surfactants, have been studied. The process kinetics, coating elements, related microstructure and the corrosion resistance (in 0.6 M NaCl) have been evaluated by various analyzes such as gravimetric and electrochemical methods, SEM with EDX-analyzes, AFM and X-ray photoelectron spectroscopy, respectively. The main elements in phosphate coatings are phosphorus, oxygen, molybdenum, nickel. Assumptions about the probable chemical compounds have been discussed.

中文翻译：

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$${\text{MoO}}_{{\text{4}}}^{{{\text{2}} - }}$$ -含溶液中铝表面的电化学磷化

摘要

浓度（2.0、4.0、7.0 和 11.0 vol %）和操作温度（20.0、40.0 和 60.0°C）对通过阴极电化学极化（0.1、0.4 和 0.6 A dm ^–2）在铝 (AA1050) 表面形成的磷酸盐涂层的影响) 在含有磷酸铵和磷酸钠的溶液中，\({\text{MoO}}_{4}^{{2 - }}\)已经研究了促进离子、无机活化剂、缓冲剂、软化剂以及表面活性剂。工艺动力学、涂层元素、相关微观结构和耐腐蚀性（在 0.6 M NaCl 中）已通过各种分析进行评估，例如重量法和电化学方法、SEM 与 EDX 分析、AFM 和 X 射线光电子能谱，分别。磷酸盐涂层中的主要元素是磷、氧、钼、镍。已经讨论了关于可能的化合物的假设。