铬对建筑用耐蚀钢筋耐蚀性能的影响

Effect of Cr on Corrosion Resistance of Corrosion-resistant Steel Rebar for Construction

通过显微组织观察、XRD、加速腐蚀试验等手段,研究了不同铬含量对耐腐蚀钢筋耐腐蚀性能的影响。结果表明,腐蚀试验开始阶段,铬含量为1.3%的钢筋腐蚀率较为平缓,而铬含量继续增加后腐蚀率快速上升;腐蚀后期腐蚀率平缓且有下降趋势。铬含量为0.5%的钢筋在整个试验周期内,腐蚀率直线上升,变化不大。试验周期过程中,铬含量为1.3%的钢筋腐蚀率均明显低于铬含量为0.5%的钢筋,铬元素的添加可以降低钢筋腐蚀率,尤其在腐蚀初期和后期。

The effects of different chromium contents on corrosion resistance of corrosion-resistant steel rebars were studied by means of microstructure observation, XRD and accelerated corrosion test. The results show that at the beginning of the corrosion test, the corrosion rate of the steel bar with 1.3%Cr is relatively gentle, while the corrosion rate increases rapidly after the chromium content continues to increase. The corrosion rate in the later stage of corrosion is gentle and has a downward trend. During the whole test period, the corrosion rate of the steel rebar with chromium content of 0.5% increase linearly, but the change is not significant. During the test cycle, the corrosion rate of rebar with chromium content of 1.3% is significantly lower than that of rebar with 0.5% Cr. The addition of chromium can reduce the corrosion rate of rebar,especially in the early and late corrosion stage.