高强耐候钢在NaCl溶液中的腐蚀锈层特征和耐腐蚀性研究

发布时间：2018-03-21 02:16

本文选题：耐候钢　切入点：交流阻抗谱　出处：《机械工程学报》2017年20期 　论文类型：期刊论文

【摘要】：为了研究高强耐候钢Q450NQR1和B2在2.0%Na Cl溶液中的腐蚀锈层特征,获得其耐腐蚀性规律。采用交流阻抗谱(Electrochemical impedance spectroscopy,EIS)、X射线衍射仪(X-ray diffracmeter,XRD)、扫描电镜(Scanning electron microscope,SEM)和电感耦合等离子体(Inductively coupled plasma,ICP)手段分析它们的腐蚀行为和锈层特征,并讨论合金元素Cu、Ni、Cr、Mo等对耐腐蚀性的影响。结果表明:B2耐候钢的耐蚀性要优于Q450NQR1耐候钢的,其锈层表现出较高的电荷转移电阻(Rt)特征;两种耐候钢的非连续性(Non-adherent rusts,NAR)和连续性(Adherent rusts,AR)型锈层物相组成分别一致,但含量有差别;NAR型锈层主要由大量的γ-Fe OOH和少量的Fe_3O_4、α-Fe OOH组成,紧贴基体的AR型锈层几乎全为Fe_3O_4。Cu、Ni、Cr、Mo合金元素在两种锈层中的分布不同,影响着NAR型锈和AR型锈的协同保护作用,从而改变了基体表面的锈层特征,稳定锈层的存在可显著抑制Cl-渗入,有助于改善材料耐腐蚀性。
[Abstract]:In order to study the corrosion and rust layer characteristics of high strength weathering steel Q450 NQR1 and B2 in 2.0 NaCl solution, The corrosion behavior and rust-layer characteristics were analyzed by means of electrochemical impedance spectroscopy, X-ray diffraction, scanning electron microscopesimetry (SEM) and inductively coupled plasma-induced plasma (ICP), respectively. The corrosion behavior and rust-layer characteristics were analyzed by means of electrochemical impedance spectroscope and X-ray diffractometer, scanning electron microscopy (SEM) and inductively inductively coupled plasma-tion (ICP), respectively. The corrosion behavior and rust layer characteristics were analyzed by means of scanning electron microscopy (SEM) and inductively induced coupled plasma-induced (ICP). The effect of alloy element Cu-NiNiCr-Mo on corrosion resistance is discussed. The results show that the corrosion resistance of WB2 weathering steel is better than that of Q450NQR1 weathering steel, and the rust layer has higher charge-transfer resistance (RT) characteristic than that of Q450NQR1 weathering steel. Non-adherent rustsof the two weathering steels have the same composition of the two types of rust layer, but the contents of the rusts-like rust layer are different. The ruster-type rust layer is mainly composed of a large amount of 纬 -Fe OOH and a small amount of Fe _ 3O _ 4, 伪 -Fe OOH, and a small amount of Fe _ 3O _ 4, 伪 -Fe OOH is mainly composed of 纬 -Fe OOH and a small amount of Fe _ 3O _ 4, 伪 -Fe OOH. (4) the distribution of the alloy elements in the two rusting layers is different, which affects the synergistic protection of NAR rust and AR rust, thus changing the rust-layer characteristics of the substrate surface. The existence of stable rust layer can significantly inhibit Cl-infiltration and help to improve the corrosion resistance of materials.
【作者单位】：钢铁研究总院工程用钢研究所;中国石油大学理学院;
【基金】：国家重点基础研究发展计划资助项目(973计划,2014CB643300)
【分类号】：TG172

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