Research on the effects of sulfate ions on steel corrosion has been conducted in response to the observations of premature localized corrosion of steel strands in cementitious grouts in posttensioned bridge construction. Electrochemical noise (EN) was shown to be an effective technique to assess the development of localized corrosion of steel in the alkaline sulfate solution. General statistics of the EN potential and current time signatures revealed the negative effect of elevated sulfate concentrations and the development of pitting events. Spectral analysis indicated an increase in the characteristic charge and decrease in characteristic frequency with sulfate ion concentration, whereas an increase in the overall corrosion rate was observed, indicating the development of pitting corrosion. Pitting events could be sustained in solutions above 10 g Na₂SO₄/L H₂O and more extensive localized corrosion developed above 20 g Na₂SO₄/L H₂O.

中文翻译：

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电化学噪声识别碱性硫酸盐溶液中钢铁腐蚀

硫酸根离子对钢腐蚀影响的研究是针对后张桥梁施工中水泥浆中钢绞线过早局部腐蚀的观察结果进行的。电化学噪声 (EN) 被证明是一种评估钢在碱性硫酸盐溶液中局部腐蚀发展的有效技术。EN 电位和电流时间特征的一般统计数据揭示了硫酸盐浓度升高的负面影响和点蚀事件的发展。光谱分析表明，随着硫酸根离子浓度的增加，特征电荷增加，特征频率降低，而观察到整体腐蚀速率增加，表明点腐蚀的发展。₂ SO ₄ /LH ₂ O 和更广泛的局部腐蚀在 20 g Na ₂ SO ₄ /LH ₂ O以上发展。