Environmental corrosivity monitor

Due to rapid industrialisation the atmosphere is polluted by acidic gases like SOl' HzS, NOl etc, which increase the corrosivity of atmosphere. For continuous monitoring of the atmospheric corrosivity a prohe and coulometer have been designed. From tbe measured coulombs the corrosivity of atmospbere can he monitored. This paper presents the results of tbe performance of the monitor

A high current RCC monitor for corrosion studies

The Stem Geary approximation method of monitoring corrosion is a wellestablished accelerated method in conducting media. The impedance method of monitoring corrosion is also very much in use. However, the Stem Geary method seems to be unsuitable in highly resistive media like concrete. An instrument has been designed to measure the polarization resistance of steel after eliminating the concrete resistance. A special probe has also been developed for this technique. Previous work in this area, confined to instruments of lower current capability, was carried out by the authors and patented 111. Now there is a demand for an RCC monitor with high current capability enabling studies on a larger area of the sample. The instrument reported in this paper is capable of supplying currents of up to 500mA with high precision and makes it possible to monitor the corrosion rate of steel in concrete