A study on corrosion behaviors of laser cladded Fe−Cr−Ni coating in as‐cladded and machined conditions

Abstract

This paper investigates the effect of turning process on surface quality and corrosion behaviors of laser cladded coatings on the 1045 steel. Corrosion resistance of the 1045 steel is improved by laser cladded Fe−Cr−Ni coatings. The as‐cladded coating behaves nobler and more resistant to corrosion compared to the 1045 steel substrate. By using turning as a finish process, surface roughness Ra of the laser cladded coating is decreased to 0.517 µm to meet the surface roughness requirement (i.e., Ra ≤ 0.8 µm) of a single‐telescopic hydraulic column. Also, surface defects including laps, cavities, and adhered material particles occur on the cladded coatings after machining. The machined coatings exhibit comparable polarization resistance compared to the as‐cladded condition, and the polarization resistance of the machined surface increases with feed rate increasing. The corrosion pits show sensitivity on feed marks induced by machining. This concentrated distribution of corrosion pits is a result of the fluctuation of local electron work function (EWF), which promotes the formation of local corrosion cells in adjacency to feed marks.

Enhanced corrosion and wear properties of H13 steel with Co‐based alloy coating prepared by laser cladding

“…Stellite 21 sample presents the most positive E corr and the smallest i corr , thus having the best corrosion resistance. [ 29 ]…”

“…Stellite 21 sample presents the most positive E corr and the smallest i corr , thus having the best corrosion resistance. [29] The Nyquist curves obtained from EIS tests are shown in Figure 13. The curves are fitted according to the equivalent circuits inside Figure 13, in which R s is the solution resistance, R b is the resistance of the corrosion product, R t is the charge transfer resistance, CPE b and CPE t represent the electrode surface capacitance and metal interface capacitance, respectively.…”

Oxidation resistance of Fe–Cr–Ni laser cladding layer under supercritical water

“…At the same time, the method of laser cladding coating on the surface still needs to further explore the contact between the corrosive medium and the substrate, so as to improve the oxidation resistance of the low-priced material and meet the operation requirements of materials under supercritical conditions. Although the laser cladded Fe-Cr-Ni layer was successfully coated on mild steel 1045 to improve the corrosion resistance [30], the oxidation resistance of high temperature has not been researched before.…”