Preparation and Performance of Electroless Nickel on HVOF (High-Velocity Oxygen Fuel) Sprayed Inconel 625 Nickel Coating for Corrosion Protection Applications

Year 2018, , 19 - 24, 31.12.2018

Harun Mindivan , Ramazan Haldun Topçu

https://doi.org/10.30516/bilgesci.476434

Abstract

High
Velocity Oxy-Fuel (HVOF) spraying is one of the preferred surface engineering
technologies that can offer advantages such as user-friendliness and
cost-efficiency in mass production of coatings for various applications. While
the main applications of the HVOF process are related to wear, corrosion
resistance can be one of the important desired features of the surface
engineering process. However, the porosity of HVOF sprayed coatings is usually
a problem when coatings are used in corrosion applications. Low carbon steel substrates
were High-Velocity Oxygen Fuel (HVOF) sprayed with Inconel 625 and then coated
with a thin film of electroless nickel (electroless nickel plating). Reference
sample without electroless nickel was sprayed at the same time.
Characterization of the coatings was made by X-Ray diffraction analyses,
microstructural surveys, cross-section and corrosion tests. Results showed that
sequential application of HVOF spraying and electroless coating processes
provided the multi-layered coating consisting of an inner inconel 625 based
layer and an outer Ni-P layer. Electroless Ni-P also caused the remarkable
increasing in the corrossion resistance as compared to the as-HVOF sprayed
state.

Keywords

Corrosion, HVOF Spraying, Inconel 625

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