Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/19769
Title: Evaluation of galvanized and Galvalume®/paint duplex coating systems for steel building panels
Authors: Race, Timothy D.
Stephenson, L. D.
Kumar, A. (Ashok), 1938-
Publisher: Construction Engineering Research Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Abstract: Abstract: Standing seam metal roofing systems are becoming increasing popular because of lower life-cycle cost and esthetic appeal. The coating systems most commonly used in metal roofs and metal buildings are galvanized or Galvalumed steel, factory-coated with polyvinylidene fluoride (PVF) or silicone modified polyester (SMP). Specimens having these coating systems were subjected to ASTM B 117, conventional salt spray exposure testing and ASTM D 5894 testing in the laboratory, which combines the environmental effects of salt fog and ultraviolet exposure, alternately, and the results were compared. The ASTM D 5894 testing was used to simulate the typical corrosive atmospheric conditions of outdoor exposure. Electro-chemical impedance spectroscopy (EIS) of specimens exposed to ASTM D 5894 accelerated laboratory weathering provided a means of modeling the equivalent circuit parameters, and detecting the onset of incipient corrosion (coating degradation). Results show that both of these systems (galvanized vs. Galvalume®) provide the same corrosion protection, and that EIS can be used to predict the long-term service life based on short-term field tests. Results indicated that ASTM D 5894 testing provides a better means of predicting real-world performance of a coating system than ASTM B 117.
Description: Technical Report
URI: http://hdl.handle.net/11681/19769
Appears in Collections:Technical Report

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