Patent ID: 8506777
Filing Date: 2013-08-13
Classification: G01N

Abstract:
1. An apparatus for measuring localized corrosion comprising: (a) a single test electrode having length L of a metal under investigation, adapted to contact a conductive fluid, and a reference electrode; (b) a temperature sensor in proximity to the single test electrode; (c) an ohmmeter configured for measuring the resistance across the length L of the single test electrode over a time period Δt to give first and second resistance values R (d) a device configured for calculating corrosion rates from changes in resistance due to corrosion and subtracting them from measurements of R (e) a device configured for measuring potential difference between the reference electrode and the single test electrode; (f) a computer programmed for determining polarization resistance R  where: (g) the computer programmed for calculating the localized corrosion from V=Rp·I, which device may be the same as or different from the devices in d) and e), where I is current, and where the current is calculated by an electrical resistance (ER) technique.