Results from the multipollutant programme: corrosion attack on painted steel after 1, 2 and 4 years of exposure (1997-2001).

Abstract

The paint steel panels coated with two layers alkyd paint (total 80 μm) have been exposed for 1, 2 and 4 years. The damage of the paint system has been evaluated by using the well-established ASTM-standards. Damage from the cut is observed at all test sites, and after four years ASTM values from 8 to 5 are observed. Comparing the results with the environmental parameters seems to indicate that the damage is affected by air pollution like in the big cities. However, the damage is also high at rural sites, particularly at sites with high amount of rain.Filiform corrosion, shown as thin whiskers under the paint film from the cut, is more dominated in the second phase of the programme than in first phase 1987-1991. Cracking of the corrosion protection paint films has been observed on several samples after four years particularly among the Mediterranean sites.