Corrosivity Classification C3
The C3 classification system is part of the ISO 12944 standard, which provides comprehensive guidelines for evaluating the corrosion protection requirements of steel structures exposed to various atmospheric conditions. Similar to other categories within this standard, C3 denotes a specific level of corrosivity that steel structures may encounter in their operational environments.
C3 is described as a moderate atmospheric corrosivity class where steel structures are exposed to moderate industrial or urban conditions. These conditions typically involve moderate humidity levels and moderate levels of airborne pollutants, which can contribute to corrosion over time if adequate protective measures are not implemented.
Examples C3 environments are breweries, dairies, laundries and heated ice skating arenas. Outdoor environments include urban areas with moderate air pollution levels and rural areas with low to moderate concentrations of pollutants.
Despite the lower risk compared to more aggressive environments, materials in C3 settings may require protective measures to prevent corrosion and maintain structural integrity.
Mitigating corrosion risks in C3 environments often involves selecting materials that offer enhanced corrosion resistance or applying protective coatings. The recommended surface treatments are hot dip galvanized and zinc/nickel. Regular inspections and maintenance are recommended to monitor potential signs of corrosion and address them promptly.
