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Corrosion Performance of TDG Coatings for Marine Bridge Application

Picture for Corrosion Performance of TDG Coatings for Marine Bridge Application
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Product Number: 51315-5942-SG
ISBN: 5942 2015 CP
Author: Md Ahsan Sabbir
Publication Date: 2015
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Coating systems for corrosion mitigation of structural steel and reinforcing steel in marine bridge applications have been widely used. However novel materials continue to become available and interest lies in identifying improved material performance for marine bridge applications. Interest in application of Thermal Diffusion Galvanizing (TDG) steel for marine bridge application has been raised. Research in progress in part considered TDG with various industry-recommended top coats for structural steel application. Test parameters included evaluating local coating defects such as abrasion environmental conditions and chloride contamination. Physical parameters such as coating thickness and adhesion were also assessed to elucidate corrosion deterioration mechanisms. Immersion in neutral pH water provided an aggressive environment analogous to coatings on structural steel exposed to wet environments (e.g. pooled runoff water). Simulated concrete pore solution (SPS) pH 13.3 was used to identify performance of coated steel in reinforced concrete applications. Accelerated corrosion tests including salt-fog exposures and outdoor exposures were made to identify the possibility for localized corrosion particularly at defects. Preliminary results showed coating bond strength to be below 1000 psi. Corrosion potentials and corrosion current densities for TDG samples immersed in alkaline solution indicated active condition of the zinc throughout the time of testing even though there was indication of degradation to the top coat.
Coating systems for corrosion mitigation of structural steel and reinforcing steel in marine bridge applications have been widely used. However novel materials continue to become available and interest lies in identifying improved material performance for marine bridge applications. Interest in application of Thermal Diffusion Galvanizing (TDG) steel for marine bridge application has been raised. Research in progress in part considered TDG with various industry-recommended top coats for structural steel application. Test parameters included evaluating local coating defects such as abrasion environmental conditions and chloride contamination. Physical parameters such as coating thickness and adhesion were also assessed to elucidate corrosion deterioration mechanisms. Immersion in neutral pH water provided an aggressive environment analogous to coatings on structural steel exposed to wet environments (e.g. pooled runoff water). Simulated concrete pore solution (SPS) pH 13.3 was used to identify performance of coated steel in reinforced concrete applications. Accelerated corrosion tests including salt-fog exposures and outdoor exposures were made to identify the possibility for localized corrosion particularly at defects. Preliminary results showed coating bond strength to be below 1000 psi. Corrosion potentials and corrosion current densities for TDG samples immersed in alkaline solution indicated active condition of the zinc throughout the time of testing even though there was indication of degradation to the top coat.
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