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采用串联不同阻值电阻和3种不同的湿态绝缘材料进行了模拟异种金属电绝缘连接构件的电偶腐蚀实验,研究了湿态电绝缘状态对船体钢-白铜电偶腐蚀的影响。结果表明:绝缘材料在湿态下可成为电子导电的材料,湿态绝缘材料的电阻既包括离子导电引起的离子电阻Ri,还包括电子导电引起的电子电阻Re。湿态电绝缘下的白铜-船体钢电偶对中船体钢的腐蚀行为主要与湿绝缘材料的Re有关。当Re小于1 kΩ时,串联电阻时的电偶电流可高于直接短接时的电偶电流,船体钢的腐蚀速率可高于直接短接时的;当Re大于1 kΩ时,Re越大,电偶电流越小,船体钢的腐蚀速率越低。湿态绝缘材料Re的形成与绝缘材料的材质有关,选择合适的电绝缘材料是防止白铜-船体钢电偶腐蚀的关键。
Galvanic corrosion experiments were carried out to simulate dissimilar metal electrical insulation connection components with series resistances and three different wet insulation materials. The influence of wet electrical insulation on the galvanic corrosion of steel-white copper was investigated. The results show that the insulating material can be an electronically conductive material under wet conditions. The resistance of the wet insulating material includes both the ion resistance Ri caused by ion conduction and the electron resistance Re caused by electron conduction. The corrosion behavior of the white copper-hull steels coupled with hull steel under wet electrical insulation is mainly related to Re of wet insulation material. When Re is less than 1 kΩ, the galvanic current in the series resistance can be higher than the galvanic current in direct short circuit, and the corrosion rate of the steel in the hull can be higher than that in direct shorting. When Re is larger than 1 kΩ, Re is larger , The smaller the galvanic current, the lower the corrosion rate of steel in the hull. The formation of wet insulating material Re is related to the material of the insulating material. Choosing a suitable electrical insulating material is the key to prevent the galvanic corrosion of the white copper-hull steel.