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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.
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.
Styrenated Unsaturated Polyester & Vinyl Ester coatings are accepted for use in chemical immersion tank linings. The primary advantage is the increased chemical resistance to harsh commodities and fast turnaround time compared to epoxy coatings. However, styrene is becoming heavily regulated due to its safety and health concerns.
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Corrosion under Insulation (CUI) is accelerated corrosion that takes place under insulation typically used to conserve energy, help with process control, and protect workers from temperature extremes. CUI is an issue for facility owners in many industries that use heat or cold in their industrial processes, including chemical processing, refining, fertilizer manufacturing, and power generation. Insulation used in these applications is generally mechanically attached to the substrate vessel or pipeline and is typically covered with cladding. Cladding is typically made out of metal or plastic and is applied to protect the insulation from physical damage and to keep water away from the insulation and substrate.
Failure of flooring materials is usually due to a combination of factors rather than a single, simple cause that led to below expectation performance. For example, construction on a less than high quality concrete slab on grade, combined with the absence of a vapor retarder, with residual concrete wear and contamination, followed by inadequate surface preparation, and finally poor coating selection applied during inclement ambient conditions that is turned over early to severe service is a recipe for disaster.