碳钢和镀锌钢在都江堰大气环境中的腐蚀行为研究

doi:10.11902/1005.4537.2014.178

中国腐蚀与防护学报

2015, Vol. 35

Issue (3): 271-278 DOI: 10.11902/1005.4537.2014.178

研究报告

本期目录 | 过刊浏览

碳钢和镀锌钢在都江堰大气环境中的腐蚀行为研究

曾宪光^1,²(

),郑兴文^2,³,龚敏^1,³,范金龙¹,陈雪丹^1,³

2. 四川理工学院化学与制药工程学院自贡 643000
3. 四川理工学院材料腐蚀与防护四川省重点实验室自贡 643000

Atmospheric Corrosion of Carbon Steel and Galvanized Steel in a Test Site at Dujiangyan City

Xianguang ZENG^1,³(

),Xingwen ZHENG^2,³,Min GONG^1,³,Jinlong FAN¹,Xuedan CHEN^1,³

1. School of Materials Science and Chemistry Engineering, Sichuan University of Science & Engineering, Zigong 643000, China
2. School of Chemical and Pharmaceutical Engineering, Sichuan University of Science & Engineering, Zigong 643000, China
3. Key Laboratory of Material Corrosion and Protection of Sichuan Province, Sichuan University of Science & Engineering, Zigong 643000, China

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摘要:

研究了碳钢和镀锌钢在都江堰市1个实验点4个微环境不同监测点1和3 a的大气腐蚀行为。对碳钢和镀锌钢在4个监测点的腐蚀形貌、腐蚀速率和腐蚀产物进行了测定和分析。结果表明,4个监测点的温度和相对湿度存在显著差异,导致碳钢和镀锌钢在4个监测点的腐蚀速率不同。随实验周期的增加,碳钢和镀锌钢的腐蚀速率减小。镀锌层能有效地减缓基体金属在大气环境中的腐蚀。而相对湿度和潮湿时间及相对湿度的波动是影响碳钢和镀锌钢腐蚀行为的重要因素。

关键词 ：大气腐蚀, 微环境, 碳钢, 镀锌钢

Abstract：

The atmospheric corrosion behavior of carbon steel and galvanized steel was investigated by exposure for one and three years respectively at four test spots with different local-environmental conditions in a test site at Dujiangyan city of Sichuan province, and then the corrosion morphology, corrosion rate and corrosion products of the two steels were carefully examined. The results showed that due to the significant differences in local temperature and relative humidity the corrosion rates of the two steels were different at the four test spots. In general, the corrosion rates of the two steels reduced with the increasing corrosion time. Zn coating could effectively protect the steel substrate, i.e. suppress the environmental corrosion in the test spots. The relative humidity, time of wetness and the fluctuation of relative humidity were important affecting factors on the corrosion of the steels.

Key words： atmospheric corrosion local environment carbon steel galvanized steel

基金资助:四川省科技厅国际合作项目 (2011HH0018) 资助

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引用本文:

曾宪光,郑兴文,龚敏,范金龙,陈雪丹. 碳钢和镀锌钢在都江堰大气环境中的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2015, 35(3): 271-278.
Xianguang ZENG, Xingwen ZHENG, Min GONG, Jinlong FAN, Xuedan CHEN. Atmospheric Corrosion of Carbon Steel and Galvanized Steel in a Test Site at Dujiangyan City. Journal of Chinese Society for Corrosion and protection, 2015, 35(3): 271-278.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.178 或 https://www.jcscp.org/CN/Y2015/V35/I3/271

表1 碳钢和锌镀层成分

图1 实验周期内都江堰市月降雨量分布图

图2 各监测点温度和相对湿度变化情况

表2 2011.7~2012.7期间各监测点温湿度统计表

图3 1和3 a腐蚀实验后试样的表面形貌

图4 3 年期试样的金相显微图

图5 不同材料试样在各监测点的腐蚀速率

表3 各监测点实验试样的腐蚀速率

图6 不同监测点锌镀层的保护效益

表4 按镀锌层和碳钢腐蚀速率得到的材料大气腐蚀性等级

图7 镀锌钢试样的SEM像和EDS结果

图8 碳钢试样表面腐蚀产物SEM像和EDS结果

图9 碳钢试样表面腐蚀产物的XRD谱

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