51312-01729-Examination of Corrosion on Steel Structures by Innovative Nano Sol-Gel Sensors

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Product Number: 51312-01729-SG

ISBN: 01729 2012 CP

Author: Max Yen

Publication Date: 2012

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Corrosion of steel and steel reinforced infrastructures is urgently needed to address since most of them have been in service for a long time and aging at a rapid path. This project is to develop a robust sensor system that can accurately determine the corrosion state of steel structures during service; thereby giving a chance to accurately estimate the durability and prevent catastrophic failure. This paper addresses preliminary work on sol-gel sensors to detect corrosion. As one of the most ubiquitous and mobile ions chloride contacts and diffuses into the steel which leads to corrosion. Sol-gel is an amorphous mechanically stable inert and porous material that has been found to change its conductivity as a function of the amounts of chloride it absorbs. Therefore sol-gel sensors may be attached to the steel to detect the amounts of available chloride for corrosion. The sensors can be tailored for its sensitivity to chloride concentration dimension and compatibility to sensor circuit. We have found that the sol-gel sensors exhibit a systematic trend in detecting the existence/concentration of chloride ions. The methods of sol-gel preparation characterization responses to chloride concentration and wireless signal collection processing and interpretation are being investigated in this study.