D. He, N. Dong, J. Jiang, Beijing University of Technology, Beijing, China
In this paper, Ni-based cored wires were prepared by using NiCr strip to wrap metal powder of Ni, Cr, Mo, CrB. Ni-based coatings were prepared by electric arc spraying process, have compact surface, more than 40MPa of bonding strength. Typical layered Ni-based coatings were fabricated. Conventional performance and microstructures of Ni-Cr-Mo and Ni-Cr-B coatings were investigated by means of scanning electron microscopy (SEM) and energy-dispersive analysis (EDAX) and X-ray diffraction (XRD) analysis, and contrastive study of Ni-Cr-Mo, Ni-Cr-Mo-Al, Ni-Cr-B alloy coatings. Corrosion-resistance performance of coatings was evaluated by salt-spray-test and electrochemical corrosion test, results are as follows. Ni-based coatings containing Mo (5%) element or B element (2-4%) had better anti-chlorine ion corrosion performance than that of Ni-based coatings without Mo element, and PS45(Ni-Cr-Ti) coating. So anti-chlorine ion corrosion coatings was studied, and could be used for resolving the corrosion protection problem of the equipments and piping contacting sour, alkali, salt liquid in the petrochemical engineering.
