CORROSION SENSORS FOR DETECTING GRAPHITIZATION OF CAST IRON IN WATER MAINS

摘要

This paper describes a new method for the non-destructive detection of graphitization corrosion in gray iron pipe, based on magnetic flux density measurements. Graphitization corrosion is unique to gray cast iron, which comprises much of the municipal water distribution infrastructure in the United States. Graphitic corrosion is particularly insidious in that graphitized pipe may appear perfectly sound upon visual inspection, despite being embrittled and prone to premature failure under load.