带隔离垫片的电偶腐蚀的模型研究

目的设计一种带有隔离垫片的电偶腐蚀模型,进行隔离效果的检测。方法选择管路密封垫片、无纺布和密封胶泥等三种材料作为隔离垫片,进行电偶电流、电偶电压和电化学交流阻抗等电化学方法的监测。结果密封胶泥的电偶电流最小,电化学阻抗一直较高;无纺布容易被溶液润湿,电偶电流最大,但它的干态绝缘电阻最高。结论所设计的电偶腐蚀模型具有可行性,不同电化学方法的结果相对应,保证了结果的可信程度。材料的隔离效果与介质的润湿程度相关,与其干态绝缘电阻关系不大。

Galvanic Corrosion Model with Insulation Spacer

Objective To design a galvanic corrosion model with insulation spacer and test the isolation effect. Methods Three kinds of materials, such as pipeline sealing gasket, non-woven fabrics and sealing daub were selected as spacer to test galvanic current, galvanic voltage and electrochemical alternating-current impedance. Results The galvanic current of sealing daub was the smallest. Its electrochemical impedance was always high; non-woven fabric was easy to be wetted, so it had the largest electric current; but it had the highest dry insulation resistance also. Conclusion The galvanic corrosion model designed is feasible. The result of different electrochemical methods are corresponding, improving the credible degree of the result. The effect of material isolation is related to the wetting degree of medium, and has little relationship with its dry insulation resistance.