ABSTRACT

The influences of the rust layer on the passivation and corrosion of Q235b carbon steel in simulated concrete pore solution were studied. The differences between the inner and outer rust layer were characterized. Results show that the pre-rusted samples could still reach passive state at high pH condition free of chloride ions. However, the quality of the passive film formed on the pre-rusted steel were dramatically lower than that formed on the fine polished steel. The pitting corrosion resistance of the pre-rusted steel was significantly higher than that of the fine polished steel in the chloride-containing pore solution. The pitting corrosion potential would be further promoted after the elimination of the outer rust layer. The reaction between the hydrogen ions and the rust layer could inhibit the pitting initiation. Furthermore, the consumption of the corrosive agents induced by the rust layer could further retard the area expansion of the pits.

摘要

研究了锈层对Q235b碳钢在模拟混凝土孔隙溶液中钝化和腐蚀的影响。表征了内外锈层之间的差异。结果表明，预生锈样品在不含氯离子的高pH条件下仍能达到钝化状态。然而，在预生锈钢上形成的钝化膜质量显着低于在精细抛光钢上形成的。预锈钢在含氯气孔溶液中的耐点蚀性能明显高于精抛光钢。消除外层锈层后，点蚀电位会进一步提高。氢离子与锈层的反应可以抑制点蚀的萌生。此外，