دانلود رایگان مقاله انگلیسی الکترود نظارت خوردگی درجای جدید برای سازه های بتن آرمه - الزویر 2018

Abstract

In this study, an embeddable in-situ corrosion monitoring electrode based on Ce-doped NiFe2O4 was fabricated, and their corrosion performance of the steel rebar was evaluated in the simulated concrete environment under passive and active conditions. The passive and active environment consists of simulated concrete pore solution (SCPS) without and with 3% NaCl. The corrosion performance of embedded steel rebar in concrete was monitored by exposing the concrete specimens under alternate dry and wet condition in 3% NaCl solution. The corrosion behavior of the steel rebar was studied by using open circuit potential, ACimpedance, and potentiodynamic polarization studies. The relative corrosion performance of the embeddable steel rebar was assessed with fabricated corrosion monitoring electrode (FCME) and compared with the surface mounted electrode (SME) by using saturated calomel electrode (SCE). The results revealed that the FCME could use as an in-situ electrode for assessing the corrosion monitoring of the reinforced concrete structures.

4. Conclusions

The following conclusions could be drawn from the above investigation:  The developed FCME can use as an in-situ corrosion monitoring sensor for detecting the corrosion behavior of reinforcing steel rebar in concrete.  The FCME is a tool used to measure the corrosion potential, corrosion current and impedance behavior of the steel rebar embedded in concrete.  Hence FCME is a promising tool for predicting the accurate information on the corrosion status of the steel rebar, whether it is in passive or active condition.  FCME is embedded very near to the steel rebar which eliminates the IR drop between the steel rebar and electrode.  These electrodes are suitable for long-term application in corrosion monitoring of reinforced concrete.  Therefore, from the above results, it is inferred that FCME could use as an embeddable in-situ electrode for corrosion monitoring in the concrete structure.