Fast Evaluation Method for Service Effect of Anticorrosion Internal Coating on Facilities in Oil and Gas Field

A portable impedance tester was developed based on low frequency 0.01 Hz impedance and 10 Hz phase angle in electrochemical impedance spectrum (EIS). On this basis, a set of fast evaluation method for service effect of anticorrosion coating on facilities in oil and gas field was established, supplemented by the apparent characteristics (peeling, bubbling, etc.) and mechanical properties (adhesion, etc.) of the internal coating. The indoor and on-site detetion and evaluation of coatings were carried out through salt spray test, adhesion test, routine electrochemistry test and field portable impedance tester test. The results showed that the evaluation method of service effect of internal coating had certain applicability and reliability. Compared with the traditional electrochemical evaluation method, the detection efficiency of the fast evaluation method for the service effect of the internal coating was significantly improved.