An On-Line Electrical Resistance Corrosion Monitor for Studying Carbon Steel Corrosion Under Feeder Pipe Conditions

Abstract

An in-situ corrosion rate monitor using a carbon steel tube, a carbon steel rod or a carbon steel wire as the sensing element has been developed. The monitor was tested both in an inert system at room temperature and in a high-temperature and high-pressure loop with LiOH solution. Experimental results from the room temperature tests show that the amount of weight loss of the carbon steel sensing element calculated from the electrical resistance signal agrees well with the increase in the amount of iron dissolved into the solution. Experimental results from the high- temperature tests show that the corrosion monitor responded to the corrosion rate changes when air or sulfuric acid was added. The precision of the monitor under the simulated feeder pipe conditions was found to be k0.04 to *1 urn in terms of thickness change. The variation in precision is dependent upon the dimension of the sensing element.