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Characterizing Bulk Porosity of CBPC Coating in Aggressive Bridge Exposure

The bulk characteristics of Chemically Bonded Phosphate Ceramic (CBPC) coating was investigated for marine bridge application in alternate wet and dry exposure. Assessment of possible bulk coating degradation was made by physical testing, Mercury Intrusion Porosimetry (MIP) and electrochemical techniques. The bulk coating material was observed to become chalky and in some cases form cracks when exposed to alternate wet and dry conditions. Cohesive strength appeared to degrade. 

Product Number: 51217-071-SG
Author: Ahsan Sabbir, Saiada Fuadi Fancy, Kingsley Lau
Publication Date: 2017
Industry: Coatings
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The bulk characteristics of Chemically Bonded Phosphate Ceramic (CBPC) coating was investigated for marine bridge application in alternate wet and dry exposure. Assessment of possible bulk coating degradation was made by physical testing, Mercury Intrusion Porosimetry (MIP) and electrochemical techniques. The bulk coating material was observed to become chalky and in some cases form cracks when exposed to alternate wet and dry conditions. Cohesive strength appeared to degrade. The characteristic pore size distribution by MIP technique indicated the increase in pore size due to exposure. Resolved impedance coating parameters did not show any other distinct trends with time or exposure environment.

The bulk characteristics of Chemically Bonded Phosphate Ceramic (CBPC) coating was investigated for marine bridge application in alternate wet and dry exposure. Assessment of possible bulk coating degradation was made by physical testing, Mercury Intrusion Porosimetry (MIP) and electrochemical techniques. The bulk coating material was observed to become chalky and in some cases form cracks when exposed to alternate wet and dry conditions. Cohesive strength appeared to degrade. The characteristic pore size distribution by MIP technique indicated the increase in pore size due to exposure. Resolved impedance coating parameters did not show any other distinct trends with time or exposure environment.

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