Research on durability of alkali-activated slag concrete (AASC) has received great attention but there are considerably few studies on the effect of carbonation on steel corrosion. In this paper, effects of activator types (waterglass and sodium hydroxide) and exposed concentrations of CO₂ (0.03%, 3% and 20% by volume) on steel corrosion have been investigated, in both AASC and ordinary Portland cement concrete (OPCC). The latter was used as the control group for comparative purposes. X-ray photoelectron spectroscopy (XPS) was used to confirm the composition of passive film of AASC and OPCC. Pore structure of specimens before and after carbonation were measured with mercury intrusion porosimetry (MIP). The corrosion state of steel rebars were monitored by open circuit potential (OCP), potentiodynamic polarization (PP), and electrochemical impedance spectroscopy (EIS). The results illustrate that AASC shows a thicker passive film with higher Fe²⁺/Fe³⁺ compared to OPCC. These two activators have similar effects on steel corrosion under the accelerated CO₂ environment, showing the similar degrees of corrosion after 140 days of accelerated carbonation. This may be attributed to the same carbonation resistance of the AASC with two different activators. In addition, AASC shows worse corrosion resistance in comparison with OPCC. Higher concentrations of CO₂ could accelerate the corrosion rate of steel rebars embedded in AASC.

碱活化矿渣混凝土（AASC）的耐久性研究受到了广泛关注，但是关于碳化对钢腐蚀的影响的研究很少。在本文中，活化剂类型（水玻璃和氢氧化钠）和暴露的CO ₂浓度的影响在AASC和普通硅酸盐水泥混凝土（OPCC）中，已研究了（按体积计分别为0.03％，3％和20％）钢腐蚀。出于比较目的，将后者用作对照组。用X射线光电子能谱（XPS）确定了AASC和OPCC的钝化膜的组成。用压汞法测量碳化前后样品的孔结构。通过开路电势（OCP），电势极化（PP）和电化学阻抗谱（EIS）监控钢筋的腐蚀状态。结果表明，与OPCC相比，AASC显示出更厚的钝化膜，其中Fe ²⁺ / Fe ³⁺更高。在加速的CO ₂下，这两种活化剂对钢的腐蚀具有相似的作用在加速碳酸化140天后的环境中，腐蚀程度相似。这可以归因于具有两种不同活化剂的AASC的相同抗碳化性。此外，与OPCC相比，AASC的耐腐蚀性更差。较高的CO ₂浓度可加快AASC中埋藏的钢筋的腐蚀速度。