Resumen
Sensor for the monitoring of corrosión by means of impedance and electrochemical noise measurements and resistance to polarization and use thereof. In the present invention, a sensor capable of performing joint measurements of impedance and electrochemical noise and resistance to polarization is presented, which allows a reliable and continuous control, both of the generalized corrosión processes and of localized corrosión. This monitoring system is suitable for industrial or process atmospheres, both at low and high temperature in which a molten, gaseous or liquid phase is present, either, for example, from metals, alloys, salts or glasses, all they in the molten state. (Machine-translation by Google Translate, not legally binding)
Reivindicaciones
1. Sensor for monitoring corrosion comprising: - at least one primary electrode and one secondary electrode for the measurement of electrochemical impedance and noise and of resistance to polarisation, formed by the same metal material as that of the monitored equipment. - a conductor wire for each electrode, - a thermocouple disposed along the longitudinal axis of the sensor, - a filling matrix where the previous elements are embedded, - an inner sheath the inside of which houses the previous elements and - a protective outer sheath which houses the previous elements. 2. Sensor for monitoring corrosion, according to claim 1, where the filling matrix consists of electrically insulating material such as oxide-based ceramic materials, e.g. aluminosilicate. 3. Sensor for monitoring corrosion, according to preceding claims, where a compound which provides electrical conductivity to improve the sensor's sensitivity is added to the filling matrix, as additive. 4. Sensor for monitoring corrosion, according to claim 3, where the additive is graphite-based particles of a size between 0.1 and 45 µm. 5. Sensor for monitoring corrosion, according to claims 3 and 4, where the additive is added to the insulating filling matrix in a proportion between 0.1 and 10 % by weight. 6. Sensor for monitoring corrosion, according to claim 1, where the inner sheath is of a heat-insulating material, e.g. ceramic-based. 7. Sensor for monitoring corrosion, according to claim 1, where the outer sheath consists of metal materials. 8. Sensor for monitoring corrosion, according to claim 1, where the conductor wires are connected by means of cables to auxiliary equipment to the sensor. 9. Sensor for monitoring corrosion, according to claim 8, where the auxiliary equipment is a potentiostat. 10. Sensor for monitoring corrosion, according to claim 1, further comprising, specimen holders for corrosion coupons. 11. Sensor for monitoring corrosion, according to any of the preceding claims further comprising a cooling system. 12. Sensor for monitoring corrosion, according to preceding claims, where the electrodes have the same dimensions and the sensor symmetry is maintained. 13. Use of the sensor claimed for local monitoring of corrosion in industrial installations. 14. Use of the sensor claim, according to claim 10, as corrosion coupon. 15. Use of the sensor claimed, according to claim 12, for comparative monitoring of the corrosion of different materials.
