CAJ | 학술논문

对比研究了普通低碳钢筋（LC）和2种耐蚀钢筋（1％Cr 和6％Cr）在未碳化（pH ＝12．6）与碳化（pH ＝10．6）模拟混凝土孔溶液中加入氯离子后的腐蚀行为．采用线性极化电阻（LPR）和电化学阻抗谱（EIS）表征钢筋的电化学行为，并通过扫描电子显微镜（SEM）和 X 射线能谱仪（EDS）对腐蚀产物进行微观形貌观察和元素分析．结果表明：在点蚀阶段，与 LC 钢筋相比，1％Cr 钢筋的临界氯离子值未提高，而6％Cr 钢筋则提高5～10倍；在腐蚀扩展阶段，1％Cr 的耐蚀性能与 LC 钢筋相比有小幅提升，可能的原因是1％Cr 钢筋中的 Cr 促使生成致密锈层．
대비연구료보통저탄강근（LC）화2충내식강근（1％Cr 화6％Cr）재미탄화（pH ＝12．6）여탄화（pH ＝10．6）모의혼응토공용액중가입록리자후적부식행위．채용선성겁화전조（LPR）화전화학조항보（EIS）표정강근적전화학행위，병통과소묘전자현미경（SEM）화 X 사선능보의（EDS）대부식산물진행미관형모관찰화원소분석．결과표명：재점식계단，여 LC 강근상비，1％Cr 강근적림계록리자치미제고，이6％Cr 강근칙제고5～10배；재부식확전계단，1％Cr 적내식성능여 LC 강근상비유소폭제승，가능적원인시1％Cr 강근중적 Cr 촉사생성치밀수층．
The chloride-contaminated corrosion behavior of 1%Cr steel,6%Cr steel and low-carbon steel (LC)exposed in saturated calcium hydroxide solution with pH value of 12.6 and carbonated simulated solution with pH value of 10.6 were studied.Linear polarization resistance (LPR)and electrochemical impedance spectroscopy tests (EIS)were adopted to assess electrochemical behavior of the steels.Scanning electron microscope (SEM)and energy dispersive spectrometer (EDS)were applied to study morphology and composition of corrosion products.The results show that during the pitting period,the chloride threshold value of 1%Cr steel is similar to that of LC steel,however in 6%Cr steel the value improves 5 to 10 times compared to LC and 1%Cr steels.During the corrosion propagation period,the corrosion-resistance of 1%Cr improves slightly compared to that of LC steel. The reason is probably due to the compact rust layer formed on 1%Cr steel.