一种Cr-Ni合金化耐蚀钢筋在氯盐环境中的腐蚀行为

发布时间：2018-04-01 16:37

本文选题：腐蚀　切入点：耐蚀钢筋　出处：《腐蚀与防护》2017年02期

【摘要】：通过加速腐蚀试验(盐雾和周浸)、电化学试验等方法研究了一种Cr-Ni合金化耐蚀钢筋和普通钢筋HRB400在氯盐环境中的耐蚀性,并通过扫描电镜(SEM)、电子显微探针分析(EMPA)和X射线衍射(XRD)等技术手段分析了锈层的形貌和组成。结果表明:在碱性和中性NaCl溶液中合金化耐蚀钢筋的耐氯离子腐蚀能力较好;在盐雾、周浸腐蚀试验中的腐蚀速率分别为普通钢筋的19.4%和12.3%;普通钢筋加速腐蚀后的锈层较厚,且为单层疏松结构,其锈层主要由Fe_3O_4、α-FeOOH和β-FeOOH构成;而Cr-Ni合金化耐蚀钢筋的锈层相对较薄,为多层致密结构,主要组成为Fe_3O_4、α-FeOOH、β-FeOOH、γ-FeOOH、CrOOH和α-Fe_2O_3;合金元素Cr和Ni通过提高钢筋的自腐蚀电位,降低腐蚀敏感性,促进保护性锈层的产生,提高了钢筋在氯盐环境中的耐蚀性。
[Abstract]:The corrosion resistance of a Cr-Ni alloyed corrosion resistant steel bar and ordinary steel bar HRB400 in chloride environment was studied by accelerated corrosion test (salt spray, weekly immersion, electrochemical test, etc.). The morphology and composition of rust layer were analyzed by means of scanning electron microscope (SEM), electron microprobe analysis (EMPA) and X-ray diffraction (XRD). The results showed that the corrosion resistance of alloyed corrosion resistant steel bar in alkaline and neutral NaCl solution was better. The corrosion rate in salt spray and weekly immersion corrosion test is 19.4% and 12.3% of that of ordinary steel bars respectively, and the rust layer after accelerated corrosion of ordinary steel bars is thicker, and it is a single layer loose structure, and the rust layer is mainly composed of Fe3OStud 4, 伪 -FeOOH and 尾 -FeOOH. On the other hand, the rust layer of Cr-Ni alloyed corrosion-resistant steel bar is relatively thin and has a multilayer dense structure, consisting mainly of Fe3O4, 伪 -FeOOH, 尾 -FeOOHH, 纬 -FeOOHOHCrOOH and 伪 -Fe2O3.The alloy elements Cr and Ni can reduce the corrosion sensitivity and promote the formation of protective rust by increasing the self-corrosion potential of steel bars. The corrosion resistance of steel bars in chloride environment is improved.
【作者单位】：江苏省(沙钢)钢铁研究院;东南大学材料科学与工程学院;
【基金】：江苏省产学研联合创新资金——前瞻性联合研究项目(BY2013091)
【分类号】：TG172

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