Journal ArticleDOI
Factors Limiting the Cathodic Current on Painted Steel
U. Steinsmo,E. Bardal +1 more
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The cathodic properties of painted steel specimens exposed to air-saturated artificial sea water have been examined in this paper, where the painted steel was cathodically polarized by galvanic coupling to freely exposed steel and the magnitude of the cathodic current and the change with time were found to depend on the paint used.Abstract:
The cathodic properties of painted steel specimens exposed to air-saturated artificial sea water have been examined. The painted steel was cathodically polarized by galvanic coupling to freely exposed steel. Both the magnitude of the cathodic current and the change with time were found to depend on the paint used. The cathodic current is most probably limited entirely by the paint film resistance. Themagnitude of the resistivity was found to vary from 10 9 Ω-cm to 10 13 Ω-cmread more
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Electrochemical test methods for evaluating organic coatings on metals: an update. Part III: Multiple test parameter measurements
TL;DR: The status of evaluating organic coated metals utilizing electrochemical means was reviewed for the period of 1988-1994 in this paper, where the test methods involving a single test parameter such as the panel potential relative to a reference electrode, electrochemical voltage and/or current noise, as well as the dc resistance of the coating on the metal substrate were covered.
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Cathodic delamination of seawater-immersed anticorrosive coatings: Mapping of parameters affecting the rate
TL;DR: In this article, the effects of various parameters on cathodic delamination have been investigated and the results show that the rate of delamination increases with increasing concentration of cations up to the point where the concentration of dissolved oxygen becomes insufficient to maintain the corrosion rate.
Journal ArticleDOI
Micro-cells beneath organic lacquers: a study using scanning Kelvin probe and scanning acoustic microscopy
M. Doherty,John M. Sykes +1 more
TL;DR: In this article, a scanning Kelvin probe (SKP) was used to map electrochemical potential distributions beneath the coating at several stages of exposure to 0.17 M (1% w/w) NaCl solution.
Journal ArticleDOI
An investigation into the cathodic delamination of epoxy-polyamine protective coatings
TL;DR: In this article, the behavior of epoxy-polyamine protective coatings under conditions of cathodic protection has been investigated and it was shown that the coatings slowly lose their barrier properties so far as ions are concerned.
Journal ArticleDOI
The generation of artificial microscopic defects in organic coatings by AFM scratching
TL;DR: In this paper, an AFM scratching methodology for controlled introduction of reproducible microscale defects into a thin film of industrial epoxy phenolic can coating is demonstrated. And local changes in topography and Volta potential are then monitored using Kelvin probe force microscopy (KPFM) following exposure to corrosive media (water or electrolyte)