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08011 Effect of Flash Rust on Protective Properties of Organic Coatings

Picture for 08011 Effect of Flash Rust on Protective Properties of Organic Coatings
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Product Number: 51300-08011-SG
ISBN: 08011 2008 CP
Author: Gyeong Rea Kim, Tae Sung Kang, Yeon Ho Cho, and Jong Man Han
Publication Date: 2008
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$20.00
$20.00
For the proper adhesion of a coating, rusts, contaminants and damaged shop primers are removed by the grit blast on block surface of ships and offshore structures. However, the flash rusts are easily produced while block is waited for coating on its surfaces, especially in rainy season. The flash rusts on the blasted surface shall be removed by the re-blast or power tool cleaning. The purpose of this study is to review the effect of the flash rust and surface roughness on the coating performance. The performance of epoxy coated steel with the flash rust was evaluated by adhesion forces and delamination areas through the pull-off test, visual inspection and electrochemical test. Our results indicate that the rust layer on substrate reduced the adhesion and accelerated the disbondment of epoxy coatings, but a small amount of flash rusts flash which is flash rust area ratio below 20 to 30 percent hardly affect the adhesion and performance of coatings.
For the proper adhesion of a coating, rusts, contaminants and damaged shop primers are removed by the grit blast on block surface of ships and offshore structures. However, the flash rusts are easily produced while block is waited for coating on its surfaces, especially in rainy season. The flash rusts on the blasted surface shall be removed by the re-blast or power tool cleaning. The purpose of this study is to review the effect of the flash rust and surface roughness on the coating performance. The performance of epoxy coated steel with the flash rust was evaluated by adhesion forces and delamination areas through the pull-off test, visual inspection and electrochemical test. Our results indicate that the rust layer on substrate reduced the adhesion and accelerated the disbondment of epoxy coatings, but a small amount of flash rusts flash which is flash rust area ratio below 20 to 30 percent hardly affect the adhesion and performance of coatings.
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06295 COMPOSITIONAL ANALYSIS OF FLASH RUST FORMED ON CARBON STEEL AFTER WATERJETTING

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Modern high performance paint systems are so durable that when exposed to natural weathering they may show only slight signs of deterioration.   This means that new coatings being marketed have limited track records. Which creates an  increased reliance on accelerated laboratory testing to evaluate performance.
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