Corrosion Resistance of Nickel-Based Composite Coatings Reinforced by Spherical Tungsten Carbide

Abstract:

Nickel-based composite coatings reinforced by spherical tungsten carbide were deposited on 42CrMo alloy steel using plasma transfer arc welding (PTAW) process. Their electrochemical corrosion properties in NaCl solution under atmospheric and high pressure were studied by polarization curve, electrochemical impedance spectroscopy. The corrosion and erosion resistance of the coatings were also investigated by salt spray corrosion and erosion corrosion tests. The results show that the self-corrosion potential of the composite coatings increased with the increase of tungsten carbide content, and the Cr element in Ni60 sample formed a stable and compact passivation film. Compared with corrosion at atmospheric pressure, the adsorption and penetration of Cl^- on the coating surface enhanced due to the increase of Cl^- activity under pressure, thereby to weaken the corrosion resistance. The Samples that passivated in salt spray environment, cannot completely hinder the corrosion of the coating, just only to slow down the corrosion. This study can provide theoretical basis for deep-sea oil drilling and production engineering equipment.

• Periodical: Materials Science Forum (Volume 993)
• Pages: 1075-1085
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.993.1075
• Online since: May 2020
• Authors: Li Fan*, Hai Yan Chen, Hai Liang Du, Yue Hou, Qian Cheng
• Keywords: Corrosion, Nickel-Based Alloy, Plasma Transfer Arc Welding (PTAW), Spherical Tungsten Carbide

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