Laser pits do not impact product performance of pre-painted steel, even on galvanized steel substrates which would show the most vulnerability. Extensive field performance monitoring of prepainted steel over decades supports the accepted conclusion that greater than 90 to 95% (or more) of prepainted steels corrosion resistance comes from the underlying metallic substrate – this excludes prepainted steel with barrier coats such as plastisols. DFM laser pits leave the underlying substrate in pristine, ‘untouched’ condition.
Prepainted steel products all exhibit cut edges, tension bends, and may be affected by scratches, and penetration by fasteners. These features do not dictate product life, and provided the prepainted products are properly selected and designed, they will be fit for purpose providing decades of satisfactory performance. A small number of periodic laser pits made by DFM are about 180 micrometres in diameter. Any minor surface corrosion that may occur results in a passive corrosion product that quickly fills the hole and stifles further corrosion. The effect is enhanced by minor leaching of corrosion inhibitors from the surrounding paint.
Please refer to our Publications webpage to see actual test results for a number of prepainted products on a galvanized steel. The only failure was due to an inadequate product specification in which the edge, scribe and dome performance were not up to standard. All other panels showed no corrosion in any of the pits located in the small rectangle drawn on each test panel.
Prepainted steel products all exhibit cut edges, tension bends, and may be affected by scratches, and penetration by fasteners. These features do not dictate product life, and provided the prepainted products are properly selected and designed, they will be fit for purpose providing decades of satisfactory performance. A small number of periodic laser pits made by DFM are about 180 micrometres in diameter. Any minor surface corrosion that may occur results in a passive corrosion product that quickly fills the hole and stifles further corrosion. The effect is enhanced by minor leaching of corrosion inhibitors from the surrounding paint.
Please refer to our Publications webpage to see actual test results for a number of prepainted products on a galvanized steel. The only failure was due to an inadequate product specification in which the edge, scribe and dome performance were not up to standard. All other panels showed no corrosion in any of the pits located in the small rectangle drawn on each test panel.
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