Effect of nitrite in corrosion of reinforcing steel in neutral and acid solutions simulating the electrolytic environments of micropores of concrete in the propagation period

被引：89

作者：

Garces, P. ^{[1
]}

Saura, P. ^{[2
]}

Mendez, A. ^{[1
]}

Zornoza, E. ^{[3
]}

Andrade, C. ^{[4
]}

机构：

[1] Univ Alicante, Obras Publ & Infraestruct Urbana, Dpto Ingn Construcc, Alicante 03080, Spain

[2] Univ Alicante, Dpto Construcc Arquitecton, Alicante 03080, Spain

[3] Univ Politecn Valencia, Dpto Ingn Construcc & Proyectos Ingn Civil, Valencia 46022, Spain

[4] Inst Eduardo Torroja Ciencias Construcc & Cemento, Madrid 28033, Spain

来源：

CORROSION SCIENCE | 2008年 / 50卷 / 02期

关键词：

acid solutions; EIS; acid inhibition; repassivation; PORE SOLUTION CHEMISTRY; CALCIUM NITRITE; IRON DISSOLUTION; REBAR CORROSION; CHLORIDE; DURABILITY; INHIBITORS; IMPEDANCE; SYSTEMS;

D O I：

10.1016/j.corsci.2007.08.016

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Inhibitors in concrete are usually used to be effective in alkaline or neutral solutions, however, when corroding by chlorides, there is a local acidification and therefore it is necessary to study the effect of the inhibitor in acid pH values. Measurements of the corrosion rate of corrugated steel bars have been carried out in solutions simulating electrolytic chloride environments in the micropores of concrete in the propagation period. It has been studied the effect of sodium nitrite as a corrosion inhibitor when added to the mentioned solutions. The solutions considered consisted of sodium chloride for neutral condition and ferrous chloride for acid condition. This is the soluble compound produced during the corrosion of steel as a result of chloride attack. Comparison of the results of polarization resistance with gravimetrically determined weight losses are presented. Also, results of electrochemical impedance spectroscopy are presented here. It has not been observed a significative improvement in using nitrite as inhibiting agent in these systems. The corrosion seems to be related to the [Cl-]/[OH-] ratio in three different regions of pH identified from acid to alkaline pH values. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：498 / 509

页数：12

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