Effect of Cr on Corrosion Resistance of Corrosion-resistant Steel Rebar for Construction
Author of the article:WANG Chunxiao;MA Longfei;WANG Bingchao;GUO Chunfang
Author's Workplace：China Railway Tunnel Group Co.,Ltd.,Luoyang 471009,China;School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471003,China
Key Words：corrosion resistant rebar Cr element corrosion rate
Abstract：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.
