Corrosion behaviors of Cr13Ni5Si2 based composite coatings prepared by laser-induction hybrid cladding

Crack-free Cr13Ni5Si2 based composite coatings were prepared by laser-induction hybrid cladding. Corrosion resistances of the coatings were investigated by dynamic polarization, electrochemical impedance spectroscopy and immersion tests in 1 N HCl solution. Results indicate that the coatings have better corrosion resistance than the stainless steel 1Cr18Ni9Ti, and the corrosion mechanism of the coatings is micro-galvanic corrosion between the Cr13Ni5Si2 and the Ni− based solid solution. Compact passive film was formed on the surface of the coating owing to its high content of Cr and Si, which can effectively protect the Cr13Ni5Si2 based composite coatings from severe chemical attacking.