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中国腐蚀与防护学报  2015, Vol. 35 Issue (4): 326-332    DOI: 10.11902/1005.4537.2014.163
  本期目录 | 过刊浏览 |
Q345钢在模拟酸性海洋气溶胶环境下的大气腐蚀行为
张丹丹1,2,王振尧2(),赵春英1,曹公望2
2. 中国科学院金属研究所 材料环境腐蚀研究中心 沈阳 110016
Atmospheric Corrosion Behavior of Q345 Steel in a Simulated Acidic Marine Aerosols Environment
Dandan ZHANG1,2,Zhenyao WANG2(),Chunying ZHAO1,Gongwang CAO2
1. School of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, China
2. Environmental Corrosion Research Center, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
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摘要: 

以NaCl+HCl为腐蚀介质,利用自制的气溶胶模拟实验装置将腐蚀介质雾化并以湿沉降的方式沉积到Q345钢样品表面,模拟Q345钢在酸性海洋气溶胶环境下的腐蚀过程。采用腐蚀失重、X射线衍射 (XRD)、扫描电镜 (SEM) 及电化学测试技术分别对腐蚀不同时间的Q345钢试样进行测试分析,研究锈层对Q345钢大气腐蚀的影响。结果表明,Q345钢表面形成的锈层不具有保护性；锈层表面腐蚀产物的成分主要为Fe3O4,γ-FeOOH和β-FeOOH,腐蚀后期有少量α-FeOOH出现,锈层结构较疏松；锈层的保护性随腐蚀时间的延长呈现先减弱然后略有增强的变化趋势。
关键词 ： Q345钢,  气溶胶,  大气腐蚀,  电化学测试    
Abstract：

The corrosion process of Q345 steel in a simulated acidic marine aerosol environment was performed by atomizing NaCl+HCl containing aerosols on the test steel surface with a home-made aerosols simulated device. The corrosion evolution of Q345 steel as a function of corrosion time was investigated by mass-loss method, X-ray diffraction (XRD), scanning electron microscopy microscopy (SEM), and electrochemical techniques. The influence of the formed rust layers on the corrosion of Q345 steel was also studied. The results show that the formed rust layers exhibit little protectiveness. The protective effect of the rust layers decreased first with corrosion time, and then enhanced slightly at last.
Key words： Q345 steel    aerosol    atmospheric corrosion    electrochemical technique
    
基金资助:国家自然科学基金重点项目(51131007)和国防技术基础项目(H102011B002) 资助
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引用本文:

张丹丹,王振尧,赵春英,曹公望. Q345钢在模拟酸性海洋气溶胶环境下的大气腐蚀行为[J]. 中国腐蚀与防护学报, 2015, 35(4): 326-332.
Dandan ZHANG, Zhenyao WANG, Chunying ZHAO, Gongwang CAO. Atmospheric Corrosion Behavior of Q345 Steel in a Simulated Acidic Marine Aerosols Environment. Journal of Chinese Society for Corrosion and protection, 2015, 35(4): 326-332.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.163      或      https://www.jcscp.org/CN/Y2015/V35/I4/326

图1  Q345钢的腐蚀失重曲线
图2  Q345钢腐蚀不同时间后腐蚀产物的XRD谱
图3  Q345钢加速腐蚀不同时间后的表面形貌
图4  Q345钢加速腐蚀不同时间后的截面形貌
图5  未腐蚀和带锈的Q345钢在不同实验周期的极化曲线
图6  未腐蚀和带锈的Q345钢的电化学阻抗谱
Corrsion time / h Rs Ωcm2 Q1 Fcm-2 n1 Rr Ωcm2 Q2 Fcm-2 n2 Rt Ωcm2
0 4.388 --- --- --- 9.899×10-4 0.845 1.309×103
24 5.871 7.513×10-3 0.651 7.764 7.432×10-3 0.646 9.055×102
48 2.737 2.362×10-3 0.760 3.840 1.376×10-2 0.618 6.717×102
96 5.646 3.920×10-3 0.588 5.590 1.844×10-2 0.529 3.848×102
192 10.380 1.119×10-2 0.582 8.640 1.154×10-2 0.669 4.497×102
表1  拟合后Q345钢的电化学阻抗谱参数
图7  未腐蚀和带锈的Q345钢的等效电路图
图8  电化学阻抗谱参数Rt随腐蚀时间的变化
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