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

Year 2018, Volume: 2 - Special Issue - International Conference on Science and Technology (ICONST 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

References

• Abioye, T.E., McCartney, D.G., Clare, A.T. (2015). Laser cladding of Inconel 625 wire for corrosion protection. Journal of Materials Processing Technology, 217, 232-240.
• Hjornhede, A., Nylund, A. (2004). Adhesion testing of thermally sprayed and laser deposited coatings. Surface and Coatings Technology 184, 208–218.
• Johnson, L., Niaz, A., Boatwright, A., Voisey, K.T., Walsh, D.A. (2011). Scanning electrochemical microscopy at thermal sprayed anti-corrosion coatings: Effect of thermal spraying on heterogeneous electron transfer kinetics. Journal of Electroanalytical Chemistry, 657, 46–53.
• Nemecek, S., Fidler, L., Fišerova, P. (2014). Corrosion resistance of laser clads of Inconel 625 and Metco 41C. Physics Procedia, 56, 294 – 300.
• Poza, P., Múnez, C.J., Garrido-Maneiro, M.A., Vezzù, S., Rech, S., Trentin, A. (2014). Mechanical properties of Inconel 625 cold-sprayed coatings after laser remelting. Depth sensing indentation analysis. Surface & Coatings Technology, 243, 51–57.
• Rakhes, M., Koroleva, E., and Liu, Z. (2011). Improvement of corrosion performance of HVOF MMC coatings by laser surface treatment. Surface Engineering, 27 (10), 729-733.
• Sidhu, T. S., Prakash, S., and Agrawal, R. D. (2005). Studies on the properties of high-velocity oxy–fuel thermal spray coatings for higher temperature applications. Materials Science, 41(6), 805-823.
• Yan, D., G. Yu, B. Hu, J. Zhang, Z. Song, X. Zhang. (2015). An innovative procedure of electroless nickel plating in fluoride-free bath used for AZ91D magnesium alloy. Journal of Alloys and Compounds 653, 271-278.