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Assessment of CBPC Coating in Wet Exposure

Assessment of CBPC Coating in Wet Exposure
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The performance of a Chemically Bonded Phosphate Ceramic (CBPC) coating was investigated for marine bridge application. Assessment of possible coating degradation and corrosion development was made by physical and electrochemical techniques. Passive-like conditions developed in the chloride-free solutions and formation of oxide product occurred in the chloride solutions. A large degree of oxide product formation throughout the non-scribed coating exposure surface area, consistent with the large, measured corrosion current, was indicative that the ceramic coating had poor barrier coating properties. 

Product Number: 51216-004-SG
Author: Md Ahsan Sabbir, Kingsley Lau, Dale DeFord
Publication Date: 2016
Industries: Corrosion Monitoring and Control , Coatings , Coatings and Linings
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$20.00
$20.00

The performance of a Chemically Bonded Phosphate Ceramic (CBPC) coating was investigated for marine bridge application. Assessment of possible coating degradation and corrosion development was made by physical and electrochemical techniques. Passive-like conditions developed in the chloride-free solutions and formation of oxide product occurred in the chloride solutions. A large degree of oxide product formation throughout the non-scribed coating exposure surface area, consistent with the large, measured corrosion current, was indicative that the ceramic coating had poor barrier coating properties. It was noted that corrosion penetration into the steel substrate was minor and interaction with an apparent intermediate layer at the steel substrate, when present, may have mitigated substantial metal loss. Further exploration on the presence and role of such intermediate layers on the corrosion mechanism is required.

The performance of a Chemically Bonded Phosphate Ceramic (CBPC) coating was investigated for marine bridge application. Assessment of possible coating degradation and corrosion development was made by physical and electrochemical techniques. Passive-like conditions developed in the chloride-free solutions and formation of oxide product occurred in the chloride solutions. A large degree of oxide product formation throughout the non-scribed coating exposure surface area, consistent with the large, measured corrosion current, was indicative that the ceramic coating had poor barrier coating properties. It was noted that corrosion penetration into the steel substrate was minor and interaction with an apparent intermediate layer at the steel substrate, when present, may have mitigated substantial metal loss. Further exploration on the presence and role of such intermediate layers on the corrosion mechanism is required.

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