Evaluation of coatings applied over corroded structural steel surfaces (FHWA-OK-91-05) 2722

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dc.contributor.sponsorOklahoma Department of Transportation. Materials and Research Division. Office of Research & Implementation
dc.creatorDaniels, R.D.
dc.creatorTottempudi, S.
dc.date.accessioned2018-10-15T15:24:16Z
dc.date.available2018-10-15T15:24:16Z
dc.date.issued1991-6
dc.description.abstractResults are presented for accelerated corrosion tests of five coating systems evaluated for use over corroded structural steel surfaces. This was the second series of such tests in a testing program initiated in 1988. The coatings were applied over both clean (non-corroded) steel panels and pre-corroded panels. The coated panels were then exposed for 1200 hours ( 50 days) in a salt fog chamber. Visual observations were made on a daily basis to obtain data on blister size, blister frequency, rust rating, and scribe rating. Using an overall performance index which is a sum of the four individual ratings, the best performing coating in this second series was the Carboline Carbozinc 11, Polyclad 936 system. The remaining four coatings were judged to have poorer overall performance, but they exhibited mixed results that made ranking more difficult. Comparison of results obtained in the two test series demonstrated that coating thickness was a significant test variable. Hence, changes in performance index with time were given more significance than the absolute values of the index. On this basis, DuPont 25P/Imron, from the first test series, and Carboline PC936/CZ11, from the second test series, were the best performing coatings evaluated. In reviewing the literature on maintenance painting strategies and cost considerations, it was concluded that surface-tolerant maintenance coatings could be of economic benefit even if their performance is inferior to that of coatings applied over clean grit-blasted surfaces.
dc.description.peerreviewNo
dc.description.versionFinal Report January 1990-June 1991
dc.format.extent63 pages
dc.format.extent8,395,146 bytes
dc.format.mediumapplication.pdf
dc.identifier.govdocFHWA-OK-91-05
dc.identifier.otherOklahoma Department of Transportation State Planning and Research item number 2722
dc.identifier.urihttps://hdl.handle.net/11244/301827
dc.languageen_US
dc.relation.ispartofseriesNo
dc.relation.requiresAdobe Acrobat Reader
dc.subject.keywordsCorrosion
dc.subject.keywordsRusting
dc.subject.keywordsCoatings
dc.subject.keywordsPaints
dc.subject.keywordsSteel
dc.subject.keywordsMaintenance Painting
dc.subject.keywordsAbrasive Blasting
dc.titleEvaluation of coatings applied over corroded structural steel surfaces (FHWA-OK-91-05) 2722
dc.typeTechnical Report
dc.type.materialtext

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