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中国腐蚀与防护学报  2017, Vol. 37 Issue (2): 93-100    DOI: 10.11902/1005.4537.2016.013
  研究报告 本期目录 | 过刊浏览 |
含铬耐候钢在模拟海洋大气环境中的腐蚀行为
张飘飘,杨忠民(),陈颖,王慧敏
钢铁研究总院工程用钢所 北京 100081
Corrosion Behavior of Cr Bearing Weathering Steel in Simulated Marine Atmosphere
Piaopiao ZHANG,Zhongmin YANG(),Ying CHEN,Huimin WANG
Structural Steel Institute, Central Iron and Steel Research Institute, Beijing 100081, China
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摘要: 

设计了1Cr-0.5Al-0.3Mo,5Cr-0.4Ni-0.3Cu和10Cr-0.3Ni 3种不同成分的实验钢,以20MnSi钢为对比钢种,采用周期浸润加速腐蚀实验、电化学测试方法,结合SEM和XRD等手段研究了实验钢种在模拟海洋大气环境中的腐蚀行为。结果表明：实验钢的腐蚀速率随Cr含量增加而降低,1Cr钢和5Cr钢锈层为双层结构,内锈层为富铬层与贫铬层交替带状结构,10Cr钢表面出现钝化现象;随着腐蚀时间延长,5Cr钢腐蚀率先增加后趋平稳,10Cr钢腐蚀率一直稳定在较低水平,20MnSi钢腐蚀率降低;Cr可提高基体自腐蚀电位和电荷传递电阻,同时增大锈层电阻。
关键词 ： 耐候钢,  Cr含量,  耐蚀性,  海洋大气环境    
Abstract：

Three different low alloy steels 1Cr-0.5Al-0.3Mo, 5Cr-0.4Ni-0.3Cu and 10Cr-0.3Ni were designed, then taking steel 20MnSi as a reference, their corrosion behavior was comparatively investigated in simulated marine atmosphere by means of periodic immersion accelerated corrosion test and electrochemical test, as well as XRD, SEM and EDS etc. In addition, electrochemical performance of the formed rust layer was assessed. The results showed that the corrosion rate of the test steels was decreased with the increasing Cr content, the formed rusts of the steels with 1% and 5%Cr composed of two layers with an inner layer of alternating band-like structure with Cr enriched sub-layers and Cr depleted sub-layers. While the steel with 10%Cr was passivated during the test. Besides, with the extending corrosion time, the corrosion rate of the steel with 5%Cr firstly increased and then stabilized, but it kept very low level for the steel with 10%Cr, and it decreased for the steel 20MnSi. Cr enhanced the free-corrosion potential and charge transfer resistance of the steels, thereby improved the compactness of the formed rusts.
Key words： weathering steel    chromium content    corrosion resistance    marine atmospheric environment
收稿日期: 2016-01-13     
基金资助:国家高技术研究发展计划 (2015AA03A502)
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张飘飘
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张飘飘,杨忠民,陈颖,王慧敏. 含铬耐候钢在模拟海洋大气环境中的腐蚀行为[J]. 中国腐蚀与防护学报, 2017, 37(2): 93-100.
Piaopiao ZHANG, Zhongmin YANG, Ying CHEN, Huimin WANG. Corrosion Behavior of Cr Bearing Weathering Steel in Simulated Marine Atmosphere. Journal of Chinese Society for Corrosion and protection, 2017, 37(2): 93-100.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.013      或      https://www.jcscp.org/CN/Y2017/V37/I2/93

Steel C Si Mn P S Cr Al Ni Cu Mo Fe
1R 0.109 0.404 0.553 0.0064 0.0045 1.011 0.513 0.019 0.37 0.3365 Bal.
2R 0.101 0.177 0.666 0.0057 0.0040 5.312 <0.01 0.396 0.337 <0.005 Bal.
3R 0.095 0.330 1.240 0.0080 0.0070 10.780 <0.01 0.340 <0.01 <0.005 Bal.
20MnSi 0.240 0.400 1.330 0.032 0.026 0.019 --- 0.012 0.021 --- Bal.
表1  实验用钢的化学成分
图1  4种实验钢周浸72 h的腐蚀速率
图2  实验钢周浸216 h的腐蚀速率
图3  4种钢周浸72 h后的表面宏观形貌
图4  4种钢周浸72 h后试样表面微观形貌
图5  4种实验钢周浸72 h后横截面锈层的SEM像
图6  1R和2R实验钢横截面形貌及锈层元素分布
图7  3种实验钢周浸72 h后锈层的XRD谱和物相半定量分析结果
Steel Self-corrosion potential / V Current density mAcm-2 Polarization resistance / Ω
1R -0.382 6.536×10-3 661
2R -0.267 4.796×10-4 1416
3R -0.136 4.137×10-4 2.54×104
20MnSi -0.392 1.244×10-2 344
表2  裸钢试样电化学极化曲线和Nyquist阻抗谱拟合参数
图8  裸钢试样在0.5%NaCl溶液中的极化曲线和Nyquist阻抗谱
图9  4种钢周浸72 h后的带锈试样极化曲线
图10  周浸72 h的带锈试样在0.5%NaCl溶液中的Nyquist阻抗谱
图11  周浸72 h的带锈试样在0.5%NaCl溶液中的等效电路图
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