Papers by Keyword: Corrosion Sensor

Abstract: In a previous study, the authors have developed a ground corrosion sensor to evaluate the corrosivity of steel members near the ground. This research aimed at the fundamental investigation of the output properties and practicality of a ground corrosion sensor. The output characteristics were verified by two electrochemical tests. The corrosion rates were evaluated using sensor measurements and indoor exposure tests by simulating NaCl aqueous solution environments, which contain air-liquid interfaces. Besides, the actual corrosion depths obtained from the exposure tests were compared with those estimated by the sensor. Moreover, an evaluation method for time-dependent corrosion depth prediction of steel members using the corrosion sensor was proposed.

Abstract: At present, the detection of weak corrosion current is not perfect and automated, to solve the problem, this paper put forward and designed a kind of weak and wide-range corrosion current real-time detection circuit with functions of automatic switching range . By choosing low bias current and high precision operational amplifier, using I - V conversion technology transform the weak current into voltage, then do voltage signal acquisition, using the SD card module and electronic analog switch combined with single chip microcomputer to realize real-time and auto-switching detection of the corrosion current. This circuit has good real-time performance and accuracy, and can achieve the corrosion current value that was outputted by gas corrosion sensor well.

Abstract: Corrosion of steel reinforcement is a major factor in the deterioration of harbor and bridge structure. Steel corrosion in concrete must be checked for investigating the condition of a reinforced concrete structure. The several way how to measuring corrosion condition of reinforced concrete, but the corrosion potential measurement is a very simple, rapid, cost-effective and non-destructive technique to evaluate the severity of corrosion in reinforced concrete structure. However some particular situations may not relate to the reinforcement corrosion probability and a simple comparison of the corrosion potential data with the ASTM Standard on steel reinforcement corrosion probability could prove meaningless because of environment factors as oxygen concentration, chloride content, the concrete resistance. Therefore this paper proposed compact designed corrosion sensors to monitor several corrosion factors, and the electrochemical measurement and evaluation have been carried out to investigate rebar corrosion, and a reasonable prediction of corrosion has been obtained in terms of nondestructive electrochemical point of view.

Abstract: Bridges are important infrastructures of all nations and are required for transportation of goods as well as human. A catastrophic failure can result in loss of lives and enormous financial hardship to the nation. Although various kinds of sensors are now available to monitor the health of the structures due to corrosion, they do not provide permanent and long term measurements. This paper investigates the fabrication of Carbon Nanotube (CNT) based composite sensors for corrosion detection of structures. Multi-wall CNT (MWCNT)/Nafion composite sensors were fabricated to evaluate their electrical properties for corrosion detection. The test specimens were subjected to real life corrosion experimental tests and the results confirm that the electrical resistance of the sensor electrode was dramatically changed due to corrosion.

Abstract: This study examines the use of multifunctional sensors for corrosion monitoring in various conditions. Experimental tests were carried out on mortar specimens to verify the applicability of a multifunctional sensor. Single-functional sensors measuring the potential and current were also used for comparison. The factors measured were the corrosion potential, galvanic cell current, resistivity, and corrosion rate. The results show that at least under the present testing conditions, the multifunctional sensor is quite useful for detecting the corrosion severity.

Abstract: Corrosion sensors were devised to develop a system whereby the depth of chloride permeation from concrete surfaces can be monitored in cover concrete of reinforced concrete structures. For making sensor which is similar to rebar author uses Screen printer machines, Ag paste and Fe powder. Appropriate portion of Ag and Fe is over 1:2. The resistance of sensors increased as the degree of corrosion increased.

Abstract: DSTO has been working for more than a decade on the development of tools to monitor the atmospheric corrosion of military aircraft. Initially, this work involved the development and use of sensors, both corrosion and environmental. The work has evolved to include corrosion models and prognostic capabilities to give a more complete corrosion prognostic health management (CPHM) system. This paper will give a historical perspective of the development of these tools at DSTO and elsewhere along with their uses and shortcomings. It will also explain how increases in the understanding of both atmospheric and aircraft corrosion have fed into the development of a more complete CPHM system. The current system is being developed by DSTO for the Australian Defence Force (ADF) with a view to facilitating condition-based maintenance for corrosion prevention that will replace maintenance dictated by either flying hours or service duration. The system functions by using sensors to measure the environmental exposure of the aircraft and models to determine the extent of corrosion expected from this exposure. The CPHM system will give the maintenance engineer a tool that will enable condition-based maintenance to be achieved and remove the requirement for costly inspection procedures, especially of hard to access areas. Finally, the work being undertaken to extend the CPHM system will be discussed.

Abstract: Localized internal corrosion of water distribution piping is difficult to detect, diagnose, and mitigate. This paper describes the demonstration and validation of multi-parameter water quality sensors and corrosion rate sensors that were permanently installed at a U. S. Army installation to detect corrosion problems and fine-tune the chemical treatment program. This paper will include results of the sensor demonstration and validation. Follow-on work includes the integration of the sensors with a dynamic real-time water distribution system chemical and hydraulic simulation. This work will also be described.