用电化学阻抗谱研究了丙烯酸系乳胶作为混凝土添加剂或钢筋表面涂层时对钢筋腐蚀行为的影响。加速腐蚀试验结果表明混凝土中添加乳胶后能够延缓钢筋表面钝化层的破坏,而对混凝土的渗透性能影响不大。乳胶涂层能够显著减小钢筋腐蚀速率,涂层的存在改变了钢筋表面的腐蚀状态。在此基础上提出了改善钢筋混凝土抗蚀能力的措施。
Acrylic emulsion was introduced into steel reinforcing concrete as concrete admixtures or rebar coatings in order to prevent steel reinforcements from corrosion. Specimens were immersed in 3% NaCl solution as accelerating corrosion test for up to 60 days. The corrosion behavior of each specimen at different immersion time was investigated with electrochemical impedance spectroscopy(ELS) method. The results showed that breakdown of the passive layer on the steel surface were deferred when incorporating 20% acrylic emulsion into concrete while its permeability remanining unchanged. The corrosion rate can also be reduced to a considerable extent when using steel rebar coated with acrylic emulsions. The active state of steel surface under the emulsion coatings was ascertained by comparing the impedance spectroscopy before and after cathodic activation. On the basis of these results, some proposals were presented to enhance the anticorrosion ability of the emulsion coatings. All above showed that acrylic emulsion is a promising material for corrosion prevention of reinforcing concrete.
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