Study On The Performance Of Al-Mn Alloy Plating And Oxidation Film Doping Lanthanide

In this paper, the Al-Mn layer coating was electrodepositedon Q235 steel surface in AlCl₃-NaCl-KCl-MnCl2 molten salts with diferent content of La₂O₃. Effects of the diferent content of La₂O₃ in the molten salt systemon the properties of coatingwas studied. The surface morphology, composition of the content, phase structure and corrosion resistance were investigated by using the method of SEM, EDS, XRD and electrochemical curves.The results showed that, after adding La₂O₃ in molten salt, the aluminum grains deposited on the surface of coating became from spherical and needle-like structure to unform and dense and layered alloy structure; La content in the coating significantly influence the performance of the alloy coating, with the increase of La content in the coating, coating structure of the alloy phase composition from Al₈Mn₅ into aluminum manganese alloy phase amorphous alloy phase.The Al-Mn ceramic coatings was obtained in Al-Mn alloy coatings by micro-arc oxidation（MAO） in electrolyte solution. In Na₂SiO₃ and Na₂CO₃ electrolyte, the influences of different electrical parameters on the Al-Mn alloy coating microstructure,phase structure of the micro-arc oxide film and corrosion resistance were studied. 4 g/L NaOH, 0.2 g/L KMnO7, 0.2 g/L NaF and 0.2 g/L C12H25OSO3 Na added in Na₂SiO₃ electrolyte respectively, to study the effect of different additives on the film performance.The micro-arc oxidation coatings surface morphology, phase structure and corrosion resistance were investigated by SEM, XRD as well as electrochemical curve. The micro-arc oxidation parameters in the Na₂SiO₃ and Na₂CO₃ electrolyte were determined by experiments. The results show that the coating of the La content has significant effects on the performance of the micro-arc oxidation film, with the increase of La content in the coating, coating corrosion resistance increase. Add KMnO₇, NaF and C₁₂H₂₅OSO₃ Na in Na₂SiO₃ electrolyte can obviously improve the performance of the micro-arc oxidation film.