Impact of surface roughness on the adhesion strength of PVA/eggshell-derived hydroxyapatite coatings on AISI 316L substrates

Mochamad Arif Irfa'i; Suherman Suherman; Achmad Fadjar Maulana Firdaus

doi:10.30811/jpl.v24i2.8690

Impact of surface roughness on the adhesion strength of PVA/eggshell-derived hydroxyapatite coatings on AISI 316L substrates

Mochamad Arif Irfa'i, Suherman Suherman, Achmad Fadjar Maulana Firdaus

Abstract

This study investigates the effect of AISI 316L surface roughness on the adhesion Poly Vinyl Alcohol (PVA) and eggshell-derived Hydroxyapatite (HA) coatings applied via slurry spraying. The surfaces were modified by the sandblasting method resulting in a maximum roughness of 4.803 µm using 16-30 mesh SiO2 as sandblasting media. Reducing SiO2 particle size to 30-60 mesh and subsequently 60-80 mesh, gradually reduces the surface roughness to 3.431 µm and 1.712 µm, proving that smaller abrasive particles result in a smoother surface. The slurry spraying process was then done using 27:73 mass-based mixture of HA and 3% PVA solution in water. Results revealed that while sandblasting significantly altered substrate topography, the resulting coatings remained dense and pore-free with consistent thickness across all roughness levels, while maximum adhesive strength of 4.09 MPa based on ASTM D4541 method was observed in the specimen sandblasted with 30-60 mesh SiO2, corresponding to a Ra value of 3.43 µm. Utilizing sustainable eggshell-derived HA provides a bioactive, cost-effective coating material that achieves high inter facial adhesion on AISI 316L, offering a mechanically stable and affordable solution for the development of next-generation orthopedic implants.

Keywords

Coating; Hydroxyapatite; Poly Vinyl Alcohol; Surface Roughness AISI 316L; Pull-off Adhesion

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DOI: http://dx.doi.org/10.30811/jpl.v24i2.8690