A comparative study on Ni-based coatings prepared by HVAF, HVOF, and APS methods for corrosion protection applications
2016 (English)In: Journal of thermal spray technology (Print), ISSN 1059-9630, E-ISSN 1544-1016, Vol. 25, no 8, 1604-1616 p.Article in journal (Refereed) Published
Selection of the thermal spray process is the most important step towards a proper coating solution for a given application as important coating characteristics such as adhesion, and microstructure, etc. are highly dependent on it. In the present work, a process-microstructure-properties-performance correlation study was performed in order to figure out the main characteristics and corrosion performance of the coatings produced by different thermal spray techniques such as high-velocity airfuel (HVAF), high-velocity oxy fuel (HVOF), and atmospheric plasma spraying (APS). Previously optimized HVOF and APS process parameters were used to deposit Ni, NiCr, and NiAl coatings and compare with HVAF-sprayed coatings with randomly selected process parameters. As the HVAF process presented the best coating characteristics and corrosion behavior, various process parameters,e.g., feed rate and stand off distance (SoD) were investigated to systematically optimize the HVAF coatings in terms of high density and corrosion properties. The coatings with lower porosity and better corrosion behavior were obtained at an average SoD of 300 mm for the Ni and NiAl coatings and a SoDof 250 mm for the NiCr coating. Increasing the feed rate to 150 g/min in the Ni and NiAl coatings decreased the coating pores and accordingly increased the Rp.
Place, publisher, year, edition, pages
Materials Park, OH: ASM International, 2016. Vol. 25, no 8, 1604-1616 p.
Thermal Spraying, Process optimization, Corrosion, OCP, Potentiodynamic polarization
Manufacturing, Surface and Joining Technology
Research subject Production Technology
IdentifiersURN: urn:nbn:se:hv:diva-9926DOI: 10.1007/s11666-016-0474-9ScopusID: 2-s2.0-84994756460OAI: oai:DiVA.org:hv-9926DiVA: diva2:972689
Ingår i lic avhandling2016-09-222016-09-222017-01-02Bibliographically approved