Corrosion resistance of Zn-Al-Mg-La-Ce coatings by electric arc spraying

Zn-Al-Mg-La-Ce coatings were prepared by electric arc spraying,and their corrosion behavior was studied with salt spray test.The characteristics of the coatings before and after corrosion were investigated by energy dispersive spectrometry(EDS),X-ray diffraction(XRD),scanning electron microscopy(SEM),polarization curves,and electrochemical impedance spectroscopy.It is shown that the coatings have outstanding self-sealing effectiveness,and their structures are compact.During corrosion,microscopic pores on the surfaces of the coatings can be jammed with their own corrosion products,thus forming a dense corrosion product layer to prevent from further corrosion.Consequently,the corrosion resistance of Zn-Al-Mg-La-Ce coatings is superior to that of normal coatings.