Steel surface preparation prior to painting and its impact on protective performance of organic coating

Sina S. Jamali, Douglas J. Mills

Research output: Contribution to JournalArticle

Abstract

The influence of surface preparation on performance of alkyd coatings on steel was investigated. Degreas-ing, abrasion with emery, acid pickling, hydroblasting and wet abrasive blasting methods were usedto modify the surface of steel before painting. Steel surfaces were analytically and morphologicallycharacterized before painting. DC resistance and pull-off adhesion methods were used to evaluate theperformance of alkyd coatings on differently prepared surfaces. Results implied the key role of oxidelayer in maintaining the high level of corrosion protection. Also the detrimental influence of the inherentcontamination caused by wet abrasive blasting method was shown as a cause of early failure of protec-tive properties. Comparison between electrochemical and adhesion results showed that they may notindicate towards similar directions in terms of protective properties which is due to the different factorsaffecting them.
Original languageEnglish
Pages (from-to)2091-2099
Number of pages9
JournalProgress in Organic Coatings
Volume77
Issue number12(B)
Early online date3 Sep 2014
DOIs
Publication statusPublished - 1 Dec 2014

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Keywords

  • Adhesion
  • DC resistance
  • Oxide layer
  • Steel surface preparation
  • UHP hydroblasting
  • Wet abrasive blasting

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