Linear Polarization Resistance

The linear polarization resistance (LPR) monitoring method is an electrochemical method used to measure instantaneous rates of uniform corrosion and is widely applied under full immersion aqueous environments. A small potential, about 5-20mV, is applied to a sensor electrode with the direct current being measured. The solution resistance should be measured independently and subtracted from the measured resistance for accuracy. The polarization resistance obtained is inversely proportional to the corrosion rate. This method has been used for more than thirty years in virtually all types of water-based environments.