Pure Al coating

Al Si alloy coating

Ni Al alloy coating and 316 L stainless steel coating were prepared on the Q235 steel by arc spraying technology. The corrosion of the four sprayed alloy coatings in the 220 k V transformer substation soil and soil solution was studied by buried specimens and electrochemical test in Hunan. The corrosion behaviors of the coating steel samples in transformer substation soil solution were investigated by line polarization

potentiodynamic polarization and electrochemical impedance spectroscopy（ EIS） tests. The macrography and corrosion products were carried out scanning electron microscopy（ SEM） and electron diffraction spectra（ EDS）. The results show that the best corrosion resistance of the four sprayed alloy coatings was Al Si coating

sequentially in the order of Ni Al and stainless steel coating

and the Al coating was easy bouffant in a long time in the underground

so that the corrosion resistance is not good.