Comparative Study of HVOF-Sprayed NiCrBSi Alloy and 316L Stainless Steel Coatings on a Brass Substrate
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Comparative Study of HVOF-Sprayed NiCrBSi Alloy and 316L Stainless Steel Coatings on a Brass Substrate S. Zouari1,2 • H. Ghorbel1 • Y. Danlos1 • H. Liao1 • R. Elleuch2
Submitted: 17 April 2019 / in revised form: 22 June 2019 ASM International 2019
Abstract Brass alloys are used in many applications. However, improving their surface properties would help to increase their service life. For that, this study proposed to deposit using high velocity oxygen fuel (HVOF), nickelchromium-boron-silicon (NiCrBSi) alloy, and 316L stainless steel (SS) coatings on brass substrates and investigate the mechanical properties and corrosion resistance of the coatings. The surface–interface morphologies, phases, and porosity of the coatings were analyzed using a scanning electron microscope and 3D profilometer. The adhesive strength and microhardness of the NiCrBSi and 316L SS coatings were also studied. Corrosion investigations were carried out using the salt fog test in an acetic acid salt spray atmosphere according to the NF EN ISO 9227 standard. This work showed that the 316L SS coatings presented a lower microhardness and higher adhesion strength than the NiCrBSi coatings despite their lower corrosion resistance. This could be explained by the microstructure of the coatings, the 316L SS coatings exhibiting more defects such as pores, un-melted particles, and oxides. Keywords 316L SS brass corrosion resistance HVOF coatings NiCrBSi alloy tensile strength
& H. Ghorbel [email protected] S. Zouari [email protected] 1
LERMPS-UTBM (Site de Sevenans), 90000 Belfort, France
2
LASEM-ENIS, 3038 Sfax, Tunisia
Introduction Due to its good malleability (Ref 1, 2), brass alloy is a widely used material in different domains (Ref 3), particularly for industrial equipment such as machine parts, faucets, fittings, etc. However, the industry presently faces demands for better surface properties of brass material to guarantee longer service life, thereby increasing the quality of such materials. The deposition of coatings is the most effective way to improve the surface behavior of most materials, including brass. For example, Varshney et al. (Ref 4) synthesized a super-hydrophobic coating on brass surface using the immersion technique. Novakovic et al. (Ref 5) produced a NiP-TiO2 coating to evaluate the influence of vacuum heat treatment on coating structures and its corrosion resistance. Hsu et al. (Ref 6) developed a Ni-P alloy film on a brass surface using the electroless process to improve the hardness and fatigue life of brass materials. Bazzaoui et al. developed strongly adherent and anti-corrosive polypyrrole coatings on cooper and brass in a sodium saccharinate solution (Ref 7) and in a sodium tartrate solution (Ref 8) using an electro-synthesis process. Ben Jemaa et al. (Ref 9) investigated the friction and wear behavior of the nickel-chromium (Ni-Cr) coating prepared by electro-deposition process on a brass substrate. For spraying, high velocity oxygen fuel (HVOF) is the preferred method. In fac
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