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A 20 Year Performance Evaluation of an Organic Zinc Rich Paint System

A 20 Year Performance Evaluation of an Organic Zinc Rich Paint System
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A five-year coatings research project was initiated by the Pennsylvania Department of Transportation in 1986 to evaluate the performance of an organic zinc rich coating system. The coating system consisted of a moisture cured urethane zinc rich primer, an epoxy intermediate, and an aliphatic polyester urethane finish coat. The system was applied to the Windgap Bridge located in McKees Rocks, Pennsylvania (near the City of Pittsburgh) in 1986 and 1987. 

Product Number: 41208-405-SG
Author: James D. Machen
Publication Date: 2008
Industry: Coatings
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$20.00
$20.00

A five-year coatings research project was initiated by the Pennsylvania Department of Transportation in 1986 to evaluate the performance of an organic zinc rich coating system. The coating system consisted of a moisture cured urethane zinc rich primer, an epoxy intermediate, and an aliphatic polyester urethane finish coat. The system was applied to the Windgap Bridge located in McKees Rocks, Pennsylvania (near the City of Pittsburgh) in 1986 and 1987. Coating system performance was tracked for the next five years using a preestablished protocol of visual inspections and physical testing. The coating system, which has now reached a twenty-year milestone, was re-inspected in 2007. Even though no coating maintenance work was performed since the initial installation, the coating system continues to provide good corrosion protection and has maintained a good appearance. This paper presents the results of the 2007 inspection and compares those results with data obtained during the original five-year research project.

A five-year coatings research project was initiated by the Pennsylvania Department of Transportation in 1986 to evaluate the performance of an organic zinc rich coating system. The coating system consisted of a moisture cured urethane zinc rich primer, an epoxy intermediate, and an aliphatic polyester urethane finish coat. The system was applied to the Windgap Bridge located in McKees Rocks, Pennsylvania (near the City of Pittsburgh) in 1986 and 1987. Coating system performance was tracked for the next five years using a preestablished protocol of visual inspections and physical testing. The coating system, which has now reached a twenty-year milestone, was re-inspected in 2007. Even though no coating maintenance work was performed since the initial installation, the coating system continues to provide good corrosion protection and has maintained a good appearance. This paper presents the results of the 2007 inspection and compares those results with data obtained during the original five-year research project.

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