Tribological and corrosion behaviour of electroless Ni-B coating possessing a blackberry like structure

Bulbul F., ALTUN H., Kucuk O., Ezirmik V.

METALS AND MATERIALS INTERNATIONAL, cilt.18, sa.4, ss.631-637, 2012 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 18 Sayı: 4
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1007/s12540-012-4011-1
  • Dergi Adı: METALS AND MATERIALS INTERNATIONAL
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.631-637
  • Anahtar Kelimeler: amorphous materials, deposition, corrosion, scanning electron microscopy (SEM), x-ray diffraction, NICKEL, DEPOSITION, ALLOYS, FILMS, BATH
  • Atatürk Üniversitesi Adresli: Evet

Özet

This study aims to evaluate the tribological and corrosion properties of the electroless Ni-B coating deposited on AISI 304 stainless steels. The microstructure of the coating was characterized using x-ray diffraction (XRD) and scanning electron microscopy-energy dispersive spectrometry (SEM-EDS). XRD analysis revealed that the prepared coating possessed an amorphous character. SEM-EDS investigation also indicated that a non-stoichiometric Ni-B coating was deposited with a columnar growth mechanism on the stainless steel substrate and the morphology of the growth surface was blackberry-like. The hardness and tribological properties were characterized by microhardness and a pin-on-disc wear test. The electroless Ni-B coated sample had a higher degree of hardness, a lower friction coefficient and a lower wear rate than the uncoated substrate. The electrochemical potentiodynamic polarization method was used to evaluate the corrosion resistance of the coating. The electroless Ni-B coating offered cathodic protection on the substrate by acting as a sacrificial anode although it was electrochemically more reactive than the stainless steel substrate.