Abstract
The use of aluminum coating is advantageous due to its low potential and protective properties against corrosion. Three aluminum coatings were applied to the surface of Q235 steel using flame spraying, arc spraying, and low pressure cold spray. Microscopic analysis revealed that the flame sprayed and arc sprayed coatings had a rough surface, while the cold sprayed aluminum coating had a uniform color and a smooth surface with no visible defects. The corrosion resistance of the arc sprayed aluminum coating was tested using simulated seawater, and the results of the polarization test showed that the original aluminum coating had a passivation phenomenon, which was attributed to the strong adhesion of the gel corrosion product Al(OH)3 and the formation of Al2O3 film. Electrochemical impedance spectroscopy (EIS) testing revealed that the main form of failure of the aluminum coating in 3.5 % NaCI solution was pore corrosion.
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