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08393 In-situ Monitoring of Organic Coatings Under QUV/Prohesion Exposure by Embedded Sensors

Picture for 08393 In-situ Monitoring of Organic Coatings Under QUV/Prohesion Exposure by Embedded Sensors
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Product Number: 51300-08393-SG
ISBN: 08393 2008 CP
Author: Kerry Allahar, Quan Su, and Gordon Bierwagen
Publication Date: 2008
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The protection afforded by organic coatings against corrosion for metallic structures is influenced by the ability of the coating to reduce the transport of water, ions, and oxygen from the environment to the substrate. The majority of protective organic coatings are two-layered with the topcoat as the barrier against the environment and the basecoat/primer providing adhesion between the topcoat and the substrate. Primers can also provide additional protection through the use of galvanic (zinc rich primers) or passivating (chromate primers) inhibitors. A standard testing method for coating systems is the QUV/Prohesion test. This test is a modification of the salt spray test and simulates weathering conditions. It involves alternating weekly between Prohesion and QUV exposures. The former includes a fog step of 1 hour salt spray at 25 oC and a dry step of 1 hour hot air at 35 oC. The latter involves 4 hours of UV light at 60 oC and 4 hours of condensation at 50 oC.
The protection afforded by organic coatings against corrosion for metallic structures is influenced by the ability of the coating to reduce the transport of water, ions, and oxygen from the environment to the substrate. The majority of protective organic coatings are two-layered with the topcoat as the barrier against the environment and the basecoat/primer providing adhesion between the topcoat and the substrate. Primers can also provide additional protection through the use of galvanic (zinc rich primers) or passivating (chromate primers) inhibitors. A standard testing method for coating systems is the QUV/Prohesion test. This test is a modification of the salt spray test and simulates weathering conditions. It involves alternating weekly between Prohesion and QUV exposures. The former includes a fog step of 1 hour salt spray at 25 oC and a dry step of 1 hour hot air at 35 oC. The latter involves 4 hours of UV light at 60 oC and 4 hours of condensation at 50 oC.
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