Application of harmonic analysis in measuring the corrosion rate of rebar in concrete |
| |
Authors: | R Vedalakshmi SP Manoharan Ha-Won Song N Palaniswamy |
| |
Affiliation: | aCorrosion Protection Division, Central Electrochemical Research Institute, Karaikudi, 630 006, Tamil Nadu, India;bSchool of Civil Engineering, Yonsei University, Seoul 120-749, Republic of Korea |
| |
Abstract: | The corrosion rate (CR) of rebar embedded in cement mortar, concrete and cement extract is determined using harmonic analysis technique (HA). Simultaneously using other electrochemical techniques such as impedance spectroscopy (EIS) and Tafel extrapolation (TET), the CR was determined and compared with the weight loss method. CR obtained from HA is comparable to that of EIS provided that the Stern–Geary constant (B value) obtained from HA is used in the calculation. In concrete, comparable corrosion rates are obtained between TET and HA only under active condition of the rebar whereas under passive state, the corrosion current (icorr) by TET is 10 times lower than that of HA. A good agreement is obtained between the HA and weight loss method. The outcome of the result suggests that HA is capable of providing a higher degree of accuracy than that of EIS and TET in the determination of icorr in the medium like rebar in concrete having very low rate of corrosion. |
| |
Keywords: | A Steel reinforced concrete B EIS B Polarization B Weight loss C Kinetic parameters |
本文献已被 ScienceDirect 等数据库收录! |
|