CORROSION SENSOR, SUPERSENSITIVE CORROSION MONITOR AND METHOD

摘要

PROBLEM TO BE SOLVED: To provide a supersensitive corrosion sensor, having high sensitivity and allowing long-time use compared to a conventional bulk sensor. SOLUTION: This sensor 4 for measuring a voltage uses a metal porous body. A relative density of the porous body is set to 0.9-0.5. By embedding the sensor 4 into a sensor head 26, a service life of the sensor 4 can be improved. Enlarging a specific surface area contacting with a corrosion gas 1 is effective in improving the sensitivity of the sensor 4. The specific surface area of the porous sensor 4 contacting with the corrosion gas 1 can be enlarged greatly, by using the porous sensor 4 formed by sintering metal fine particles. When making the corrosion gas 1 to flow along the porous sensor 4, the corrosion gas 1 penetrates not only the surface of the porous sensor 4 but also the inside of the porous body from pores 2, to form scales 3 on the surface and the inside of the porous body. Thus, the porous sensor 4 has the larger specific surface area to be corroded than the conventional bulk sensor to detect a voltage change, even in the case of minute corrosion without influence of electric noise.