Formation and characterization of nano-Mn/Ti based oxide films on LY12-CZ (2024-T3) aluminum alloy
Chromate conversion coatings can be successfully employed for the corrosion protection of aluminum alloy. However, the environmental legislations in many countries have imposed severe restrictions on chromate use due to its high toxicity, carcinogenic nature and consequent environmental hazards. Many attempts have been made to find alternatives to chromate conversion coatings. In this work, the preparation of nano-Mn/Ti based oxide films were obtained by immersing in the solution containing MnO4 - and Ti4+. The morphologies of the oxide films studied by field emission scanning electron microscope (SEM) revealed that the oxide films had compact nano-flake structure and the average thickness of these flake was around 20 nm. Energy dispersive spectroscopy (EDS) indicated that manganese was uniformly distributed on the oxide films; but titanium was enriched in the micro-regions of the oxide films. The results of X-ray photoelectron spectroscopy (XPS) showed that the oxide films consisted of MnO2 and TiO2. Electrochemical experiments exhibited that the corrosion resistance of the oxide films was equivalent to that of the chromate conversion coatings. The formation and anti-corrosion mechanisms of the nano-Mn/Ti based oxide films were discussed.
oxide film nanostructure aluminum alloy anti-corrosion
吕勇武 熊金平 朱光 左禹
北京化工大学材料科学与工程学院,北京100029
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）