Study on WBT Coating Degradation Mechanism by EIS and Water Absorption Monitoring

2014 Fiscal Year Final Research Report

• Project/Area Number: 25820427
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Naval and maritime engineering
• Research Institution: National Maritime Research Institute
• Principal Investigator: HAYASHIBARA Hitoshi 独立行政法人海上技術安全研究所, その他部局等, 研究員 (20511588)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 防食塗装 / 塗装劣化 / 電気化学インピーダンス法 / バラストタンク / 塗膜下腐食

Outline of Final Research Achievements

Resistance of Water ballast tank(WBT) coating system presented large temperature dependency in the examination. After water saturation in coating, resistive behavior was observed at higher than 40 degree C. It is concluded resistance of WBT coating system can be obtained by heating of the system before the corrosion initiation.
The deterioration of WBT coating system was examined in the corrosion test which consisted of alternate temperature conditions. Capacitance increased and resistance increased during the test. After the test, blisters and corrosion was observed. The change of impedance will be caused by the initiation of water infiltration sites in/under coating in terms of the change of coating layer.

Free Research Field

総合工学・船舶海洋工学