Study of the interfacial chemistry of poly(vinyl chloride) paint on steel exposed to the ultraviolet- water condensation test

Feliú, S.; Fierro, J.L.G.; Maffiotte, C.; Chico, Belén; Morcillo, M.

doi:10.1163/156856197x00101

Cited by 5 publications

(2 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, the chemical transformations in delaminated polyvinyl chloride coatings 28 are very similar to those occurring under ultraviolet radiation. 30 These observations indicate that an analogue can be drawn between the attacks of the free radicals involved in cathodic delamination and photochemical degradation. Therefore, the generalized oxidative degradation of organic coatings resulting from the free radicals will involve an attack on the polymer backbone via hydrogen abstraction.…”

Section: Degradation Resulting From Free Radicalsmentioning

confidence: 98%

“…In addition, the chemical transformations in delaminated polyvinyl chloride coatings 28 are very similar to the chemical transformations in polyvinyl chloride coatings under ultraviolet radiation. 30 These observations indicate that the free radicals, generated by the corrosion process, may behave analogous to the free radicals which are formed during photooxidation of organic coatings exposed to ultraviolet radiation (top coats). Therefore, it is interesting to study methods to minimize the destructive effects from the reactive intermediates as previously encouraged.…”

Section: Introductionmentioning

confidence: 95%

See 1 more Smart Citation

Reduction of cathodic delamination rates of anticorrosive coatings using free radical scavengers

Sörensen

Weinell²,

Dam‐Johansen

et al. 2010

J Coat Technol Res

View full text Add to dashboard Cite

Cathodic delamination is one of the major modes of failure for anticorrosive coatings subjected to a physical damage and immersed in seawater. The cause of cathodic delamination has been reported to be the result of a chemical attack at the coating-steel interface by free radicals and peroxides formed as intermediates in the cathodic reaction during the corrosion process. In this study, antioxidants (i.e., free radical scavengers and peroxide decomposers) have been incorporated into various generic types of coatings to investigate the effect of antioxidants on the rate of cathodic delamination of epoxy coatings on cold rolled steel. The addition of <5 wt% free radical scavengers to epoxy coatings improved the resistance toward cathodic delamination by up to 50% during seawater immersion, while peroxide decomposers had a limited effect. Testing using substrates prepared from stainless steel, copper, aluminum, galvanized steel, and brass also showed a reduction in the rate of cathodic delamination when the coating was modified with a free radical scavenger. The protective mechanism of free radical scavengers investigated for the primers are similar to that of antioxidants used for protection against photochemical degradation by UV-radiation of top coatings. Both substrate corrosion and degradation of a coating exposed to UV-radiation lead to the formation of free radicals as reactive intermediates.

show abstract

Section: Degradation Resulting From Free Radicalsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 95%