Water-line Corrosion Behavior Measured by Electrical Resistance Method and Multi-electrode Technique

A new sensor system was developed based on an integrated multi-electrode technique in conjunction with an electrical resistance (ER) method. And using this sensor, the water-line corrosion behavior in static and flowing environments was studied respectively. The results showed that in a static 3.5% NaCl solution, the main anodic area was located at the bottom of the sensor, and the water-line corrosion was controlled by the oxygen differential cell. In flowing 3.5% NaCl solution, the main anodic area moved up to a position close to the water-line, and the bottom area transferred to a cathodic area, that is, the flow of the medium would affect the water-line corrosion. In both test environments, macro cell corrosion was the main factor affecting water-line corrosion.