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Initiation of localized steel corrosion in alkaline sulfate solution
Materials and Structures ( IF 3.8 ) Pub Date : 2021-06-30 , DOI: 10.1617/s11527-021-01740-8
Samanbar Permeh , Kingsley Lau , Matthew Duncan , Ron Simmons

The role of sulfate ions on corrosion of steel in alkaline solutions (including cementitious materials) has been contested in the literature due to the effects of the many exposures, material and test conditions. Recent observations of steel corrosion in cementitious grouts in post-tensioned bridges coinciding with elevated sulfate-ion concentrations have prompted the development of material specifications concerning segregated grout. Electrochemical testing of steel in alkaline sulfate solutions were conducted to elucidate the impairment of the passive layer. The increase in the anodic current exchange density at higher sulfate ion concentrations resulted in the development of electronegative potentials and high corrosion rates. The numerous distinct electrochemical noise events in solutions with > 1,300 ppm SO42− were characteristic of metastable pitting and pitting. The results of the testing identified sulfate levels that impair the passive layer and provided support for recent specifications that limited sulfate ion concentrations in deficient grout.



中文翻译:

在碱性硫酸盐溶液中引发局部钢腐蚀

由于许多暴露、材料和测试条件的影响,硫酸根离子在碱性溶液(包括胶结材料)中对钢腐蚀的作用在文献中一直存在争议。最近对后张桥梁水泥浆中钢腐蚀的观察结果与硫酸根离子浓度升高相一致,这促使有关隔离浆的材料规范的发展。在碱性硫酸盐溶液中对钢进行电化学测试,以阐明钝化层的损伤。在较高硫酸根离子浓度下阳极电流交换密度的增加导致了负电势和高腐蚀速率的发展。SO 4 > 1,300 ppm 溶液中的许多不同的电化学噪声事件2-是亚稳态点蚀和点蚀的特征。测试结果确定了损害钝化层的硫酸盐水平,并为限制缺陷灌浆中硫酸根离子浓度的最新规范提供了支持。

更新日期:2021-06-30
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