Effectiveness of corrosion inhibitors in saturated calcium hydroxide solutions acidified by acid rain components

被引：49

作者：

Tommaselli, M. A. G. ^{[1
]}

Mariano, N. A. ^{[2
]}

Kuri, S. E. ^{[3
]}

机构：

[1] Fundacao Univ Fed Grande Dourados, Fac Ciencias Exatas & Tecnol, Rodovia Dourados, MS, Brazil

[2] Univ San Francisco, Programa Posgrad Engn & Ciencia Mat, BR-13251900 Itatiba, SP, Brazil

[3] Univ Fed Sao Carlos, Dept Mat Engn, BR-13565905 Sao Carlos, SP, Brazil

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2009年 / 23卷 / 01期

关键词：

Concrete; Corrosion; Inhibitors; CEMENT-BASED MATERIALS; REINFORCING STEEL; MOLYBDATE; BEHAVIOR; ATTACK; PASSIVATION; CA(OH)(2);

D O I：

10.1016/j.conbuildmat.2007.12.002

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Aggressive air pollutants are known to attack concrete and threaten its integrity and decreasing the pH value. The compounds produced by the reaction of concrete hydration products with these aggressive agents cause the pH of concrete matrices to decrease, depassivating the surface of reinforcing steel and leading to the corrosion process. The effect of sodium nitrite and sodium molybdate as corrosion inhibitors was therefore analyzed in a saturated calcium hydroxide solution polluted with sulfuric and nitric acids (acid atmosphere). Both compounds exhibited significantly inhibitory effects, depending on the concentration. At low concentrations (0.013% total solution mass), sodium molybdate proved more efficient than sodium nitrite, but their inhibitory effect was found to be similar at high concentrations (0.040% total solution mass). (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：328 / 333

页数：6

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