Server maintenance is scheduled for Saturday, December 21st between 6am-10am CST.

During that time, parts of our website will be affected until maintenance is completed. Thank you for your patience.

Menu
Search
Filters
Close
Menu

Corrosion Durability of Three-Coat and Epoxy Mastic Coating Systems after Adverse Environmental Exposures during Coating Repair

Corrosion Durability of Three-Coat and Epoxy Mastic Coating Systems after Adverse Environmental Exposures during Coating Repair
Available for download

Coatings are widely used for highway steel bridges exposed to aggressive environments to extend their service life. Even with the continuous development of coating technologies, steel bridges remain susceptible to corrosion deterioration. Periodic maintenance, that may include coating repair, is required for long term bridge serviceability. Selection of compatible repair coating materials and appropriate preparation of the steel surface are critical parameters for corrosion protection. 

Product Number: 51218-145-SG
Author: Md Ahsan Sabbir, Saiada Fuadi Fancy, Kingsley Lau, Dale DeFord
Publication Date: 2018
Industries: Corrosion Monitoring and Control , Coatings
$0.00
$20.00
$20.00

Coatings are widely used for highway steel bridges exposed to aggressive environments to extend their service life. Even with the continuous development of coating technologies, steel bridges remain susceptible to corrosion deterioration. Periodic maintenance, that may include coating repair, is required for long term bridge serviceability. Selection of compatible repair coating materials and appropriate preparation of the steel surface are critical parameters for corrosion protection. Environmental contaminants such as soluble salts and adverse environmental conditions including temperatures and moisture presence should be properly controlled; however, in the practical senses for field conditions, control of environmental exposure conditions are challenging. The purpose of this study was to evaluate the effect of surface preparation with varying environmental conditioning on the durability of repair coating. Adverse environments during coating repair application included exposure to different levels of humidity (5%, 75%, and 100% RH) and salt contamination was considered. After exposure to adverse conditioning, coating degradation and corrosion development on three-coat zinc-rich primer and aluminum epoxy mastic repair coatings were analyzed by cyclic salt wet/dry exposure cycles. The three-coat system appeared to have better performance during the course of the test exposure. Inadequate surface preparation (abraded steel) and salt contamination can cause reduced adhesion for the epoxy mastic and result in degraded coating barrier properties. Pull-off strength testing of samples with conditioning of the steel surface at 5-100% humidity prior to repair, did not show clear differentiation in performance.

Coatings are widely used for highway steel bridges exposed to aggressive environments to extend their service life. Even with the continuous development of coating technologies, steel bridges remain susceptible to corrosion deterioration. Periodic maintenance, that may include coating repair, is required for long term bridge serviceability. Selection of compatible repair coating materials and appropriate preparation of the steel surface are critical parameters for corrosion protection. Environmental contaminants such as soluble salts and adverse environmental conditions including temperatures and moisture presence should be properly controlled; however, in the practical senses for field conditions, control of environmental exposure conditions are challenging. The purpose of this study was to evaluate the effect of surface preparation with varying environmental conditioning on the durability of repair coating. Adverse environments during coating repair application included exposure to different levels of humidity (5%, 75%, and 100% RH) and salt contamination was considered. After exposure to adverse conditioning, coating degradation and corrosion development on three-coat zinc-rich primer and aluminum epoxy mastic repair coatings were analyzed by cyclic salt wet/dry exposure cycles. The three-coat system appeared to have better performance during the course of the test exposure. Inadequate surface preparation (abraded steel) and salt contamination can cause reduced adhesion for the epoxy mastic and result in degraded coating barrier properties. Pull-off strength testing of samples with conditioning of the steel surface at 5-100% humidity prior to repair, did not show clear differentiation in performance.

Product tags
Also Purchased
Effect of Surface Preparation of Coating Performance
Available for download

Effect of Surface Preparation of Coating Performance

Product Number: 41216-953-SG
Author: Devin Clark, Richard C. Ferguson & James W. Rawlins
Publication Date: 2016
$20.00

Coating performance and longevity is highly dependent on the quality of substrate surface preparation. The effect of profile height, profile type (e.g., type of tool used to perform the prep, angularity of profile, etc.), extent of cleanliness, and amount of chloride contamination on coating performance were all studied to determine the correlation between these factors in an attempt to identify the primary factor in coating failure due to improper surface preparation.
Picture for 08002 Degradation Study of Polymer Coating: Improvement in Coating Weatherability Testing and
Available for download

08002 Degradation Study of Polymer Coating: Improvement in Coating Weatherability Testing and Coating Failure Prediction

Product Number: 51300-08002-SG
ISBN: 08002 2008 CP
Author: Francois-Xavier Perrin, Celine Merlatti, Emmanuel Aragon, and Andre Margaillan
Publication Date: 2008
$20.00
Picture for Coatings + Proceedings 2021-ALL Papers
Available for download

(Coating Formulation) Coatings on the Edge of Forever

Product Number: 12-COAT_DEC21
Author: Carl Reed / Kat Coronado
Publication Date: 2021
$20.00

A continuing problem with coatings applied to sharp edges of a structure is the corrosion that often develops at the apex of the edge. The conventional wisdom is that the reduction of film thickness, due to coating pulling away at the edge during the curing of the coating, is the primary cause for the onset of corrosion. This theory, however, is not necessarily correct, both from a mechanistic and practical point of view.
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support