PREFERENTIAL WELD CORROSION -2

The scanning vibrating probe is relatively new and could provide information about corrosion activity on a small scale. However, its utilization to investigate the corrosion of welds has weld limited. Pistorius  used a number of techniques including the scanning vibrating electrode to investigate the role of sulphur in the localized corrosion of welds in high manganese carbon steels (Pistorious,2000).The authors suggested that hardened microstructures within the HAZ,such as bainite and martensite,do not form galvanic couples with surrounding microstructure but the formation of the networks of sulphide in the fusion line area is the most likely explanation for grooving parallel to the weld line in corrosive environments.