سال انتشار: ۱۳۹۰

محل انتشار: سومین همایش ملی تحقیقات نوین در شیمی و مهندسی شیمی

تعداد صفحات: ۴

نویسنده(ها):

Shahriar. Arjmand – Department of Chemistry, Islamic Azad University, Firoozabad Branch, , Iran

چکیده:

The simplest method in measurement of corrosion is application of metal coupons which require great force and a lot of time. Another method used is electrical resistance methods but the limitation of such methods is high sensitivity toward temperature and also they can not identify localized corrosion from general corrosion. In contrast to these methods, there are other electrochemical tests such as Linear Polarization Resistance (LPR),Electrochemical Impedance Spectroscopy (EIS), Harmonic Distortion Analysis of Electrochemical Noise, and Electrochemical Frequency Modulation through which a major part of such obstacles can be removed.The electrochemical noise is used to study the corrosion issues in various sectors of heavy industries such as oil and gas industries, fossil power plants, petrochemical industries, nuclear energy as well as space industries. In this paper, different methods of corrosion measurement and evaluation are discussed. Besides, the differences of three main sources in electrochemical systems for electrochemical noise measurement are examined and the applications of this method are explained. The survey results indicate that among the discussed methods, electrochemical noise method has the capability of measuring corrosion in the systems with very low to very high rate of corrosion . The main applications of electrochemical noise in corrosion which distinguishes it from other methods include: determination of localized start like pitting or crevice corrosion , studying general corrosion , studying steel bars in reinforced concrete (RC) ,stress corrosion and determination of crack start the effect of inhibitors , destruction of coverings , as well as alluvial and microbial corrosion .Moreover, the electrochemical corrosion in comparison with other methods of corrosion measurement has three main advantages including application in open circuit, simple equipment and relatively low prices, good speed of tests performance in this method