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中国腐蚀与防护学报  2016, Vol. 36 Issue (1): 47-51    DOI: 10.11902/1005.4537.2015.018
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纯Al在3种典型沿海,工业和乡村大气中的腐蚀行为
刘艳洁,王振尧(),柯伟
中国科学院金属研究所 沈阳 110016
Characterization of Corrosion Products on Pure Al Exposed in Atmospheres at Typical Rural, Industrial and Coastal Areas in China
Yanjie LIU,Zhenyao WANG(),Wei KE
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
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摘要: 

纯Al在沿海,工业以及乡村大气环境中暴露12个月之后,利用电化学阻抗谱技术 (EIS) 以及扫描电镜 (SEM) 研究腐蚀产物对纯Al大气腐蚀过程的影响.结果表明,纯Al在沿海环境中腐蚀最为严重,在工业环境中次之,在乡村环境中最轻.在沿海与工业环境中,纯Al表面形成了不同厚度的腐蚀产物层;在乡村环境中,只有少量腐蚀产物分散存在,未形成连续的腐蚀产物层.纯Al大气腐蚀的速率控制步骤在沿海环境中为扩散过程;在工业与乡村环境中为电荷转移过程.
关键词 ： 大气腐蚀,  Al,  EIS,  腐蚀产物    
Abstract：

Pure Al plates were exposed in different atmospheres for 12 months at three typical test sites respectively: i.e. a rural site at Xishuangbanna of Yunnan province, an industrial site at Jiangjin of Sichuan province and a coastal site at Wanning of Hainan province. Then the corroded Al plates were characterized by means of EIS technique and SEM. The results indicate that the corrosion resistance of pure Al is the worst in the coastal atmosphere, the best in the rural atmosphere and the middle in the industrial atmosphere. Different thick layers of corrosion products were formed on Al surface in the rural and industrial atmosphere. In the contrast, a few corrosion products were formed dispersedly in the coastal atmosphere. The rate controlling step may be the diffusion of corrosive ions for the corrosion process in the coastal atmosphere, while the charge transfer for those in the rural and industrial atmospheres.
Key words： atmospheric corrosion    Al    EIS    corrosion product
    
基金资助:国家自然科学基金项目 (51131007)和国防技术基础项目(H102011B002) 资助
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刘艳洁
王振尧
柯伟

引用本文:

刘艳洁,王振尧,柯伟. 纯Al在3种典型沿海,工业和乡村大气中的腐蚀行为[J]. 中国腐蚀与防护学报, 2016, 36(1): 47-51.
Yanjie LIU, Zhenyao WANG, Wei KE. Characterization of Corrosion Products on Pure Al Exposed in Atmospheres at Typical Rural, Industrial and Coastal Areas in China. Journal of Chinese Society for Corrosion and protection, 2016, 36(1): 47-51.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.018      或      https://www.jcscp.org/CN/Y2016/V36/I1/47

Atmosphere Mean temp.
℃		 Mean rel. hum.
%		 Total sunshine
time / h		 Total rain
time / h		 Cl-
mg / 100 (cm2d)		 SO2
mg / 100 (cm2d)		 pH of rain
Coastal
(Wanning)		 25.1 85 1832.5 391.71 0.5039 0.0559 5.34
Rural
(Xishuang banna)		 22.2 79 1909.1 111.44 0.0045 0.0212 6.4
Industrial
(Jiangjin)		 18.5 80 650 504.8 0.0036 0.8238 5.12
表1  户外暴露点的主要环境参数
图1  纯Al在不同环境下暴露12个月后的腐蚀产物表面形貌
图2  纯Al在不同环境下暴露12个月后的腐蚀产物的截面形貌
图3  纯Al在不同环境下曝晒12个月后的点蚀坑形貌
Atmosphere Rct / kΩcm2 Rr1 / kΩcm2 Rr2 / kΩcm2
Rural 5.08×103 5.63 ---
Industrial 3.83×103 0.115 389
Coastal 0.247 0.406 2.10×103
表2  不同大气环境中Rct,Rr1与Rr2值
图4  纯Al在不同环境下腐蚀12个月后的Bode图
图5  不同腐蚀环境下的等效电路
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