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10015 High Performance and Environmentally Friendly Coating System for Water Ballast Tank of Ship in the Shipbuilding Industries

Picture for 10015 High Performance and Environmentally Friendly Coating System for Water Ballast Tank of Ship
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Product Number: 51300-10015-SG
ISBN: 10015 2010 CP
Author: Sangki Chi, Junho Ha, Seunghyun Kim, Byeongwan Kim, Minyoung Shon
Publication Date: 2010
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Organic coatings are widely used in ship structure for corrosion protection and IMO PSPC Guideline has recently been issued to achieve high anti-corrosion properties. Currently, solvent borne epoxy paints are generally used in ship coating, especially water ballast tank (WBT) and the emission of volatile organic compound (VOC) materials such as hydrocarbon solvents is inevitable. Evaporation of solvent was known as pollutant material and resulting in hazard to health of spray worker. Therefore, the current trend is toward the application of lower VOC coating material, especially solvent free coating containing solvent less than 5% or water borne paint for environmental and human protection. Additionally, multi-coating system of ship coating including 2- main coating and 2-strip coating was also raised as one of reason for air pollution.

In present study, the performances of commercially used solvent free epoxy paint with 1-main coating and 1-stripe coating has been evaluated comparing with those of commercially used solvent-borne paint with 2-main coating and 2-strip coating in terms of anti-corrosion, build-up properties, crack resistance and contents of volatile organic compound. From the results, it would be clearly indicated that solvent free epoxy coating showed equivalent or higher anti corrosion and build up performances than solvent borne epoxy.

Keyword: Solvent free paint, IMO PSPC, Cyclic test, VOC
Organic coatings are widely used in ship structure for corrosion protection and IMO PSPC Guideline has recently been issued to achieve high anti-corrosion properties. Currently, solvent borne epoxy paints are generally used in ship coating, especially water ballast tank (WBT) and the emission of volatile organic compound (VOC) materials such as hydrocarbon solvents is inevitable. Evaporation of solvent was known as pollutant material and resulting in hazard to health of spray worker. Therefore, the current trend is toward the application of lower VOC coating material, especially solvent free coating containing solvent less than 5% or water borne paint for environmental and human protection. Additionally, multi-coating system of ship coating including 2- main coating and 2-strip coating was also raised as one of reason for air pollution.

In present study, the performances of commercially used solvent free epoxy paint with 1-main coating and 1-stripe coating has been evaluated comparing with those of commercially used solvent-borne paint with 2-main coating and 2-strip coating in terms of anti-corrosion, build-up properties, crack resistance and contents of volatile organic compound. From the results, it would be clearly indicated that solvent free epoxy coating showed equivalent or higher anti corrosion and build up performances than solvent borne epoxy.

Keyword: Solvent free paint, IMO PSPC, Cyclic test, VOC
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In ship's ballast tanks, most of coating failures (and corrosion attacks) were observed on sharp steel edges, welds seams and weld spatters. One solution is to employ high solid coating material with less tendency to flow away from edges. In this study, two coatings  are selected and evaluated in terms of their edge retention ability.
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