亚硝酸盐阻锈剂抑制钢筋混凝土阻锈效果的研究_.pdfVIP

亚硝酸盐阻锈剂抑制钢筋腐蚀效果研究 柳俊哲 贺智敏 (宁波大学建筑工程与环境学院， 浙江 宁波 315211) [摘要]:含氯化钙与亚硝酸钙混凝土中通过加速试验肉眼观察确定了腐蚀等级，并结合电极电位、腐蚀面积率和 失重率等确定了抑制钢筋腐蚀所需临界摩尔浓度NO ― ― 2 /Cl 比。实验结果表明，随着氯离子含量的增加，抑制钢 3 ― ― 筋腐蚀所需临界摩尔浓度越高。在氯离子含量小于 4kg/m 范围内，NO2 /Cl 摩尔比大于 1.2 时完全抑制混凝土 中钢筋腐蚀。 关键词：钢筋腐蚀；亚硝酸盐；阻锈效果；临界摩尔浓度 Study on Inhibiting Effect of Nitrite Salt on Corrosion of Reinforcing Bars LIU Jun-zhe HE Zhi-min (School of Civil Engineering，Ningbo University ，Ningbo 315211 ，China) Abstract: The measurements of the visual investigations, half-cell potentials, lost weight and corroded area by accelerated corrosion method of the reinforcing bars embedded in concrete containing various quantities of calcium ― ― chloride and calcium nitrite were conducted to determine the threshold value of molar ratio of NO2 /Cl that inhibits reinforcing bars from corrosion. This study confirmed that the threshold values increases with increasing proportion of ― ― chloride in the concrete. It is molar ratio of NO2 /Cl above 1.2 that can preserve the passive state of reinforcements adequately when chloride content is 4kg/m3 in the concrete. Keywords: steel corrosion ； nitrite salt ； inhibiting effect ； threshold value of molar 阻锈剂用于钢筋混凝土中测定腐蚀程度后认为亚硝 1 前言 [5] 酸盐类阻锈剂效果最为明显 。 钢筋锈蚀引起的结构物破坏，是我国乃至世界 本文通过高温高湿和低温低湿循环的方法加速 各国土木工程领域普遍关注的热点问题。它的危害 含亚硝酸钙和氯化钙混凝土中钢筋腐蚀，通过肉眼 主要有