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The study of water-line corrosion in static and dynamically flowing electrolytes using multi-electrode sensor in combination with electrical resistance method

Paper Number: 34
Author/s: Yunze Xu1, 2, Mike Yongjun Tan1* and Yi Huang2
Organisation: 1School of Engineering and Institute for Frontier Materials Deakin University, 75 Pigdons Road, Waurn Ponds, VIC 3216, Australia 2School of Naval Architecture and Ocean Engineering, Dalian University of Technology, 2 LingGong Road, Dalian, Liaoning 116024, China

Abstract

In this work, a new sensor system was developed based on an integrated multi-electrode technique in conjunction with an electrical resistance (ER) method. This new method has allowed galvanic currents flowing among the multi-electrodes and the total metal loss simultaneously measured. On the basis of the new designed 10 elements sensor system, the water-line corrosion in both static and flowing electrolytes were studied. It is found that in the static 3% NaCl aqueous condition, the major anodic area is located at the bot
tom of the sensor suggesting the water-line corrosion is controlled by the oxygen differential cell. However, in the flowing condition, the major anodic areas were close to the water line and the bottom region transferred to a cathodic area, suggesting that the flowing of the electrolyte is an important influence factor of the water-line corrosion. From the comparison of the galvanic current and the ER measurement results, it is seen that galvanic corrosion is the main contribution of the water-line corrosion in both static and flowing electrolytes.