Modern science and technology research present situation and development trend of corrosion monitoring system

Corrosion to the national economy to bring the huge economic loss has been aroused people's attention, corrosion protection become one of the important areas of modern science and technology research. Mechanism of metal corrosion rate and the main content is the study of corrosion protection, corrosion cell detection technology is an important means of research of metal corrosion rate and mechanism. So the importance of corrosion detection technology to emerge. Metal corrosion resistance method, speed, is based on the metal specimen due to corrosion cross-sectional area is reduced, resulting in the principle of resistance increase. Use of the principle have developed more resistance probe is used for monitoring equipment corrosion situation, is an effective tool of equipment corrosion. Can be in the process of equipment operation by using this method for continuous monitoring of equipment corrosion condition, to accurately reflect the equipment operation corrosion rate at each stage and its changes, and can apply to a variety of media, not affected by the influence of conductivity of medium, its temperature only restricted by materials;

It is different from method of corrosion monitoring system, do not need to remove the sample from the corrosive medium, also don't have to remove corrosion products; Resistance method is fast, sensitive and convenient, large production equipment can monitor the corrosion rate of corrosion. Linear polarization method for corrosion situation changes fast response, can get the instantaneous corrosion rate, more sensitive, can reflect the change of equipment operation condition in a timely manner, is a kind of very suitable for monitoring method. But it is not suitable for application in poor conductivity of medium, this is because when the device surface with a layer of dense oxide film or passivation membrane, accumulation of corrosion products, even will result in false capacitance and cause a great error, even you can't measure. In addition, the corrosion rate are obtained by linear polarization method, technical foundation is based on the steady state condition, the measured object is uniform corrosion or corrosion in an all-round way, thus linear technology can't provide the information of local corrosion. Under the condition of some special detection of metal corrosion rate usually need to be compared with other test methods to ensure the accuracy of the linear polarization detection technology. Linear polarization resistance method can online real-time monitoring of the corrosion rate.