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Corrosion resistance of laser cut hipoeutectoid carbon steels

Samples of low carbon steel with different C contents were cut with an industrial laser with power emission from 200 to 2000 Watt in CW regime. Samples were then submited to corrosive natural and laboratory environments. Atmospheric corrosion and inmersion tests were followed by SEM-EDAX analysis to determine relative activity of laser affected and non affected zones. We were able to distinguish two different affected zones and one non affected zone. Electrochemical behaviour of the zones were determined by potentiokinetic polarisation and the morphology of the attacks were compared through SEM to those naturally nucleated in the distinct environmental conditions. The corrosion resistance and surface hardness increases determined, were associated to the structural changes caused by the laser thermal modification of the kerf walls. We infer that the susceptibility of these steels to exfolliation in marine environments can then be reduced by laser heat treatments.