钛钢复合板在海水中电偶腐蚀研究

Study on Galvanic Corrosion Occurred in Titanium Steel Composite Plate in Seawater

电偶腐蚀电位接近碳钢自腐蚀电位,不随面积比的增大而变化;电偶腐蚀电流密度和腐蚀深度,随阴阳面积比的增加成倍增大。钛钢复合板制设备一旦内层钛局部腐蚀穿孔,钛与碳钢形成大阴极小阳极的电偶对,很大的电偶腐蚀电流密度作用在碳钢上,使碳钢加速腐蚀,造成设备早期失效。

The galvanic corrosion potential of titanium steel composite plate is close to the corrosion potential of carbon steel, which is not changed with the area ratio. But galvanic corrosion current density and corrosion depth increase exponentially in the incease of positive and negative area ratio. Once the inner titanium layer in titanium-steel composite equipment perforated as a result of localized corrosion, the large cathode small anode galvanic is formed by titanium and carbon steel. A large galvanic corrosion current density affected on steel, with which the corrosion of steel will be accelerated and it leads to the early failure of equipment.