The influence of the electrolyte composition on the diffusion process through chlorinated-rubber and vinyl films.

C.I. ELSNER; A.R. DI SARLI

Corrosion Prevention & Control

Scientific Survey

Año: 1996 p. 124 - 130

0010-9371

The influence of the chloride concentration on the mass transport through vinyl and chlorinated-rubber films applied on steel was studied using potentiostatic oxygen reduction as the test reaction. Besides DC electrochemical measurements, visual inspection was carried out in order to assess the deterioration of the coated steel with immersion time. From the experimental results it may be concluded that: 1) there is a significant chloride concentration influence on the steady-state current on the oxygen-reduction reaction ; 2) vinyl and chloride-rubber anticorrosive paints showed a different behaviour from both electrochemical and visual points of view; 3) due to its greater chemical inertia, vinyl paint behave as predicted by Fick?s first law, while chlorinated-rubber showed an anomalous behaviour which seemed to be due to parallel cathodic reactions to the oxygen reduction; 4) unpigmented and non-plasticized chlorinated rubber applied in very thin films gave a good anti-corrosive protection level, attributed to its strong adhesion to the steel substrate.