CORROSION MONITORING BY MEANS OF ELECTROCHEMICAL NOISE AN EXAMPLE FROM THE CHEMICAL-INDUSTRY

Recently the registration of the electrochemical noise has become a me aningful method in corrosion monitoring to recognize the occurence of a local corrosion process immediately and relate it to the momentary c onditions in the plant. The described device NDU (Noise Detection Unit ) is a new development which was constructed for harzardous location u se in a chemical plant. After a description of the device the measurin g sensors are presented. The interpretation of the results is explaine d on data obtained from the duplex stainless steel SAF 2507. Finally m easurements performed on probes of steel XGCrNiMoTi17-12-2 are describ ed. They were recorded over a longer period of time and related to the conditions in the plant.