The total annual cost of corrosion in India was estimated to be INR 4.27 lakh crore (70.3USD billion) for the year 2011-12 which is nearly 4.21% of country's total Gross Domestic Product (GDP) for that year. Cost of corrosion (CoC) is significant, and strategies for corrosion mitigation and its study is necessary to reduce the cost. In corrosion studies, to evaluate the performance of any mitigation strategy and complete the experimental work in a stipulated time, researchers artificially accelerate the corrosion of embedded reinforcement bar. Also, corrosion monitoring and its prediction are needed in most of the experimental/laboratory research works. There are several commercial systems/devices available in the market for performing such tasks
but are expensive. Economical instrumentation in this regard support and encourage more research studies on corrosion and its mitigation in academic/small to medium scale laboratories. Authors have developed a multi-utility device at IIT Bombay that can accelerate, monitor and predict the corrosion of nine specimens simultaneously. Also, this device can be operated in two different configurations and monitor the resistivity offered by the concrete specimen during the Rapid Chloride Migration Test (RCMT). Besides the supply voltage and current drawn by each specimen, the developed device can log the ambient air temperature and relative humidity levels during the experimentation at the required interval. Monitoring these associated corrosion parameters is essential in estimating the apparent chloride diffusion coefficient (Dapp). This coefficient is useful in evaluating the performance of the adopted mitigation strategy in terms of the service life of an RC structure. Thereby, the developed instrument can be used in multiple ways in the corrosion-related studies and is helpful for many researchers in carrying out the experimental laboratory works at very low-cost. The device can be customized according to the need of the study and is very handy.
The developed system has tremendous potential to be commercialised. It can be made available to a broader research community and encourage more corrosion mitigation studies. The device is applied for the Indian patent and been published. More details regarding the developed instrument can be found in the published patent section with the following credentials.