HVOF-sprayed coatings (WC-17Co, WC-10Co-4Cr, Co-28Mo-17Cr-3Si) and electrolytic hard chrome (EHC) coatings corrosion resistances have been compared through electrochemical polarization tests (0.1 N HCl, 0.1 N HNO3) and Corrodkote test. EHC coatings passivate in HNO3, but undergo pitting corrosion in HCl and in Corrodkote test too. HVOF coatings do not passivate, but possess more noble corrosion potentials. Both in HNO3 and HCl, they undergo more generalized corrosion, with similar i(corr); crevice corrosion along splat boundaries is sometimes detected after the HCl test. Their i(corr) in 0.1 N HCl solution is lower than in several of EHC coatings. No visible damage in the HVOF coatings has occurred after the Corrodkote test. (c) 2006 Elsevier Ltd. All rights reserved.

Corrosion resistance of HVOF-sprayed coatings for hard chrome replacement / Bolelli, Giovanni; Giovanardi, Roberto; Lusvarghi, Luca; Manfredini, Tiziano. - In: CORROSION SCIENCE. - ISSN 0010-938X. - STAMPA. - 48:11(2006), pp. 3375-3397. [10.1016/j.corsci.2006.03.001]

Corrosion resistance of HVOF-sprayed coatings for hard chrome replacement

BOLELLI, Giovanni;GIOVANARDI, Roberto;LUSVARGHI, Luca;MANFREDINI, Tiziano
2006-01-01

Abstract

HVOF-sprayed coatings (WC-17Co, WC-10Co-4Cr, Co-28Mo-17Cr-3Si) and electrolytic hard chrome (EHC) coatings corrosion resistances have been compared through electrochemical polarization tests (0.1 N HCl, 0.1 N HNO3) and Corrodkote test. EHC coatings passivate in HNO3, but undergo pitting corrosion in HCl and in Corrodkote test too. HVOF coatings do not passivate, but possess more noble corrosion potentials. Both in HNO3 and HCl, they undergo more generalized corrosion, with similar i(corr); crevice corrosion along splat boundaries is sometimes detected after the HCl test. Their i(corr) in 0.1 N HCl solution is lower than in several of EHC coatings. No visible damage in the HVOF coatings has occurred after the Corrodkote test. (c) 2006 Elsevier Ltd. All rights reserved.
48
11
3375
3397
Corrosion resistance of HVOF-sprayed coatings for hard chrome replacement / Bolelli, Giovanni; Giovanardi, Roberto; Lusvarghi, Luca; Manfredini, Tiziano. - In: CORROSION SCIENCE. - ISSN 0010-938X. - STAMPA. - 48:11(2006), pp. 3375-3397. [10.1016/j.corsci.2006.03.001]
Bolelli, Giovanni; Giovanardi, Roberto; Lusvarghi, Luca; Manfredini, Tiziano
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/612545
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