Electrochemical comparison between corrosion resistance of some thermally sprayed coatings
by G. Bolelli, V. Cannillo, R. Giovanardi, L. Lusvarghi
International Journal of Surface Science and Engineering (IJSURFSE), Vol. 2, No. 3/4, 2008

Abstract: Electrochemical polarisation and impedance spectroscopy tests in 0.1 M HCl and 0.1 M H₂SO₄ solutions were performed on HVOF-sprayed cermet coatings (WC-17% Co, WC-10% Co–4% Cr) and Atmospheric Plasma-Sprayed (APS) ceramics (Al₂O₃, Al₂O₂–13 wt%TiO₂, Cr₂O₃) with APS bond coat (Ni-Co-Cr-Al-Y). Reference tests were also performed on hard chrome electroplating. Plasma-sprayed coatings offer limited substrate protection owing to interconnected porosity, although the bond coat promotes some forms of passivation in H₂SO₄ HVOF-sprayed cermets possess good corrosion resistance in both environments. Chrome electroplating shows comparatively better corrosion resistance in H₂SO₄, but worse in HCl.

Online publication date: Sat, 27-Sep-2008

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