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The Time to First Maintenance (TFM) Chart was developed from real world data and a corrosion prediction model, the Zinc Coating Life Predictor (ZCLP). The corrosion rate data was collected from galvanized steel samples exposed to the five defined environments in locations around the world and then coupled with the statistical methods and neural network technology of the ZCLP.

The data points of the TFM chart are based on macroscopic environmental data and, thus, may vary from the actual corrosion rate observed, due to site-specific environmental conditions. Atmospheric levels of airborne salinity, precipitation, relative humidity, sulfur dioxide, and temperature influence actual corrosion rates in a specific geographic location. Zinc coating thickness is linearly related (on a macrolevel) to the time to first maintenance of hot-dip galvanized steel.

Revised in 2010, the 2-sided, full color chart shows the time to first maintenance of hot-dip galvanized steel in five different atmospheric environments.  The reverse page contains a singled-out view of the industrial environment’s time to first maintenance. 

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Available for download in PDF format. Terms of Use.

Copies of this resource are available for purchase. Architects, engineers, and other specifiers in North America may request a single copy of any publication at no charge, unless otherwise indicated. Multiple copies require a $25.00 (US funds) minimum order, plus shipping and handling. Prepayment is required. (Member galvanizers are not eligible for complimentary printed copies and require a $75.00 minimum order.) Non-member galvanizers must contact the AGA directly at 720-361-4483.

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