Corrosion Sensors, Corrosion Detectors and Corrosion Monitoring Systems are being more popular these days as they can be used to increase the product life and lessen the maintenance cost of metallic structures. Corrosion has a well-recognized destructive influence on the structural integrity of nearly all engineering structures (aircraft, pipelines, bridges, buildings, etc.). Corrosion can cause high value assets to deteriorate, shortening their useful lives. Corrosion related repairs and replacements drives up costs. Thus Condition Based Maintenance (CBM) strategies are being explored by many organizations in an effort to reduce inspection costs while minimizing the risk of equipment damage from corrosion. The use of sensors for field monitoring of corrosivity and degradation of corrosion protection systems is an attractive option for a CBM corrosion strategy.

The reliability of a given structure will tend to decrease over time necessitating a service or maintenance operation once the reliability drops below some given threshold value. Corrosion sensors have been developed to determine the optimum timing of service/maintenance operations as well as to provide quantitative performance information, to help monitor the integrity of engineering structures and systems.

Selection of Corrosion Sensors for Corrosion Monitoring System

Low cost and easy-to-use corrosivity sensors are desired to help manage corrosion and reduce life cycle costs and improve system readiness. Corrosion monitoring system could provide field performance data for determining the effectiveness and return on investment of corrosion prevention and control programs (new coating systems, wash cycles, etc).

Successful implementation of a corrosion monitoring system would require that the sensors be low cost, small size and weight, and widely deployable. Additional requirements include EMI resistance, easy installation, simple operation and data analysis, and low maintenance.

A typical disadvantage of many types of corrosion sensors is that they measure corrosion events as they occur but provide no evidence of cumulative damage based on a single measurement; measured data must be integrated over the exposure time. This type of measurement scheme requires continuous data acquisition which must be automated requiring the use of a powered sensor.