The estimated time to first maintenance for a hot-dip galvanized coating that experiences common atmospheric exposure can be seen in Figure 7. Time to first maintenance is defined as the time to 5% rusting of the substrate steel. The time to first maintenance of hot-dip galvanized steel is directly proportional to the zinc coating thickness.
Figure 7: Time to First Maintenance Chart for Hot-Dip Galvanized Coatings
