The development process, and through the in equipment of the pipeline corrosion monitoring method of ultrasoni thickness corrosion monitoring system

The corrosion status of diagnosis, prevent the happening of the accident. Through a variety of corrosion monitoring technology, for corrosion monitoring of possible corrosion of components, to provide gas well, pipeline and equipments corrosion state information, understand the corrosion rate and corrosion type, the trigger condition for corrosion, for researchers and operators to provide corrosion of intuitive, reliable, timely information. And through the information feedback in time, to prevent accidents caused by excessive corrosion plays an important role. Monitoring the efficacy of anti-corrosion measures. Through to the original state and using the anticorrosion measures after the equipment condition monitoring and contrast, can understand the application effect of anticorrosion measures, provide foundation support for the evaluation and improvement of the corrosion protection measures. In order to ensure the long-term effective corrosion monitoring, usually need to establish a permanent monitoring devices to enhance monitoring effect.

Ultrasonic thickness measurement method is the use of piezoelectric transducer to generate high frequency sound waves through the material, the measuring probe of the return of the echo time or record resonate as signal amplitude of the sound waves, to detect defects or wall thickness measurement. General recorder display oscilloscope or curve is used to receive the signal, more advanced instrument can directly show defects, or the thickness of the numerical. Ultrasonic chemical equipment widely used in the detection of inner defects, corrosion damage and measuring equipment and pipe wall thickness. Ultrasonic thickness measurement method can measure repeatedly to the operation of the equipment, but it is difficult to obtain sufficient sensitivity to track the change of corrosion speed.

Corrosion monitoring system for electrochemical impedance spectroscopy (EIS) is superior to the other is a characteristics of the technique of transient, simply to impose an infinitesimal in the steady state system of sine wave disturbance, for the study of thin film on the electrode, such as modified electrodes and electrochemical deposited film field study is very important, because this kind of measurement does not lead to large changes in membrane structure. In addition, the application of EIS frequency range (10-2 ~ 105 hz), and can simultaneously measure the electrode process kinetics and mass transfer parameters, and through detailed theoretical model or equivalent circuit of the experience, which is the ideal element (such as resistance and capacitance, etc.) to represent the system in the process of Faraday, space charge and electrons and ions in the transmission process, that are not normally distribution the microscopic properties of matter, therefore, the electrochemical system and corrosion EIS has now become a research system of a kind of effective method. Since the Bard for the first time in 1982 to the introduction of the EIS research field of conductive polymer, many scholars EIS was applied to all kinds of conductive polymer system extensively studied. For high resistance electrolyte and a wide range of many medium conditions of the technology have greater reliability. In a wider frequency range measuring ac impedance need time is very long, so it is difficult to achieve real-time monitoring of the corrosion rate and corrosion monitoring is not suitable for the actual scene. In order to overcome this shortcoming, people for most of the impedance characteristics of corrosion system, through the selection of appropriate two frequency, monitoring the corrosion rate of metals, the design and manufacture of automatic ac corrosion monitor.