Aluminum alloy is widely used in power grids to solve the problem of aluminum excess and copper deficiency. The MAO film is prepared by micro-arc oxidation on LY12 aluminum alloy with phosphate electrolyte. The growth rate of film layer in different treatment time is studied and the variation trend of film in growth and outward growth was carried out. Finally, the morphology and composition of the film were tested by SEM and EDS. The results show that the initial growth of micro-arc oxidation is slow, mainly grow outwards, the medium-term rate is accelerated, the later period is slow, and the middle and late stages are mainly grow inwards. Phosphorus in the electrolyte participates in the film reaction.
In this paper, the corrosion resistant coatings were fabricated on AZ91 Mg alloy by steam treatment using deionized water as a steam source. The treatment temperature was maintained at 150 ℃, while the treatment time was varied at 3, 6 and 9 h. The results showed that relatively dense steam coating can be formed on the surface of AZ91 alloy by steam treatment for 3-9 h, and the phase structure of steam coating was mainly composed of Mg(OH)2 and contained AlO(OH) and Mg-Al LDH. With the extension of the steam treatment time, the better the corrosion resistance of the steam coating, and the corrosion current density was as low as 10-7~10-8 A·cm-2, which was 3-4 orders of magnitude lower than AZ91 Mg alloy substrate (~10-4 A·cm-2).
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