Development and characterization of sol–gel silica–alumina composite coatings on AISI 316L for implant applications
2007; Elsevier BV; Volume: 201; Issue: 16-17 Linguagem: Inglês
10.1016/j.surfcoat.2007.02.026
ISSN1879-3347
AutoresS. K. Tiwari, Trilochan Mishra, M K Gunjan, A. S. Bhattacharyya, T B Singh, Raghuvir Singh,
Tópico(s)Metal and Thin Film Mechanics
ResumoSol–gel alumina coatings were deposited on medical grade stainless steel (AISI 316L) with an intermediate layer of silica by dip-coating method. The coatings obtained were homogeneous, crack-free and consisted of low crystalline γ-Al2O3 along with some boehmite phase. EDAX revealed the presence of only Al in the film. The corrosion performance of alumina-coated stainless steel was evaluated by electrochemical polarization, open-circuit potential measurement and chronoamperometry in Ringer's solution. Coating has shown to enhance the pitting potential of AISI 316L by ∼ 470 mV and reduced passive current ≤ 10− 9 A cm− 2. The formation of thermodynamically stable silica–alumina interface was proposed to account for enhanced corrosion protection behaviour of the coating.
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