The Corrosion Behavior of Ni-P/SiC Composite Coating

Abstract

The Ni-P/SiC composite coating was prepared by chemical deposition technique. The corrosion behavior of electroless Ni-P/SiC composite coating was investigated. The results show that the corrosion resistance of electroless composite coating decreased with the increasing SiC concentration in bath solution. There were some little pores among the composite coating and the pores would increased with the increasing SiC content among the coating, which made the corrosion resistance decreased. The corrosion rate increased with the increasing temperature of corrosion liquid. The corrosion resistance was improved for T gradient electroless Ni-P/SiC composite coating comparing with the single electroless composite coating whether the corrosion solution was acid solution or alkaline solution. The corrosion rate were less than 5 mg/cm2for all specimens in alkaline solution, which indicated that the corrosion resistance of electroless composite coating was better than that in acid solution.

FP-based formulations as protective coatings in oil/gas pipelines

“…Diamondlike carbon coatings have high wear and corrosion resistance, and they have shown good barrier and anticorrosion properties [5]. Ni-P/SiC composite coatings also show good wear and corrosion resistance [6,7]. However, both of these materials are expensive and require special application techniques, like chemical vapor deposition.…”

UV‐curable sol–gel based protective hybrid coatings

“…Diamond‐like carbon coatings and Ni–P/SiC composite coatings could be used but these materials are expensive and their application requires chemical vapor deposition (CVD), which is impractical. Relatively inexpensive epoxy and phenolic type polymeric coatings, which are known for their excellent properties of adhesion and resistance to chemicals can be good candidates for use to mitigate corrosion in pipelines .…”

Phase composition, microstructure and microhardness of electroless nickel composite coating co-deposited with SiC on cast aluminium LM24 alloy substrate

“…Concentrations of SiC in the range of 2-18 g/l were used to study the effect on the coating properties. For comparison purpose between particles free and with particles, 2.2 g/l of SiC was taken arbitrarily, based on the concentration range used in literature [8,17]. Prior to introduction into bulk plating solution, the hard particles (SiC) was stirred in a small part (about 200 ml) of plating solution by using magnetic stirrer to facilitate homogenous suspension of the hard particles and then poured into the bulk plating solution.…”

“…The composite coating shows some micro pores which might be the marks for particles' temporary existence before falling off due to improper envelopment in metal matrix owing to slow deposition during plating process. Li et al [13], Yang et al [17] and Huang et al [21] observed the existence of pores as well in the electroless nickel composite coating. The samples heat treated at 400°C exhibit more pores as compared to as-deposited condition for both the EN and ENC samples which might be attributed to the void created by the release of trapped hydrogen gas during the course of annealing.…”