Microstructure and properties of aluminum coatings on Al alloy surface by arc spraying

The pure aluminum coatings on 6061 Al alloy were prepared by arc spraying.The microstructure and porosity of the coating were observed by means of optical microscope.The evaluation of the corrosion properties of the coatings was carried out through the simulated immersing tests, salt spray test and electrochemical experiment in 5% NaCl solution.The results showed that the pure aluminum coating was homogeneous and dense, as well as lower porosity.The coatings can protect the Al alloy substrate from corrosion.The corrosion resistance of the coating with sealing was better than that of the coating without sealing.