西安建筑科技大学学报(自然科学版)

模拟海洋与工业大气环境下结构钢腐蚀行为

舒赣平¹,陈尧²,卢瑞华¹,武成凤¹

(1.东南大学土木工程学院混凝土及预应力混凝土结构教育部重点实验室,江苏南京 211189; 2.江苏科技大学土木工程与建筑学院,江苏镇江 212100)

Corrosion behavior of structural steel in simulated marine and industrial atmosphere environment

SHU Ganping¹, CHEN Yao², LU Ruihua¹, WU Chengfeng¹

(1.Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, School of Civil Engineering, Southeast University, Nanjing 211189, China; 2.School of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Jiangsu Zhenjiang 212100, China)

Keywords：carbon structural steel; microscopic morphology; pitting depth; variable coefficient; correlation model

DOI: 10.15986/j.1006-7930.2022.04.001

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分别采用室内盐雾试验模拟海洋大气环境、周浸试验模拟工业大气环境,研究碳素结构钢在两种不同模拟环境下的腐蚀行为.通过SEM扫描电镜分析了碳素结构钢在两种不同环境下的腐蚀微观形貌差异,采用三维非接触表面形貌仪获得腐蚀试样点蚀深度分布模型和点蚀深度变异系数.结果表明:两种不同大气环境下碳素结构钢腐蚀形貌有明显差异; 平均腐蚀深度与时间呈幂函数关系; 点蚀深度近似服从正态分布,点蚀深度变异系数随腐蚀时间的增长有减小趋势,可作为碳素结构钢腐蚀特征评价指标之一.进一步采用灰色系统理论对碳素结构钢室内外腐蚀相关性进行分析,验证了室内模拟加速腐蚀试验的合理性,并建立了室内外腐蚀相关性预测模型,可用于碳素结构钢在海洋大气和工业大气环境下腐蚀程度的预测.

The corrosion behavior of carbon structural steel in two different simulated environments were studied by simulating marine atmosphere with salt spray test and industrial atmosphere with alternate immersion test. The corrosion micro morphology of carbon structural steel in two different environments was analyzed by SEM. The pitting depth distribution model and variation coefficient of pitting depth were obtained by three-dimensional non-contact surface morphology analyzer. The results show that the corrosion morphology of carbon structural steel is obviously different in two different atmospheric environments. The relationship between average corrosion depth and time is a power function. The pitting depth approximately follows the normal distribution, and the variation coefficient of pitting depth decreases with the increase of corrosion time, which can be used as one of the evaluation indexes of carbon structural steel corrosion characteristics. Then,the gray system theory was used to analyze the correlation between indoor and outdoor corrosion of carbon structural steel, which verified the rationality of indoor simulated accelerated corrosion test. The correlation prediction models of indoor and outdoor corrosion were established, which can be used to predict the corrosion depth of carbon structural steel in marine atmosphere and industrial atmosphere.

引言
1 试验概况
2 试验结果分析
3 碳钢室内模拟加速腐蚀与户外大气暴露的相关性
4 结论

表1 Q235碳钢主要化学成分 /%<br/>Tab.1 Chemical composition of Q235 carbon steel /%

表1 Q235碳钢主要化学成分 /%
Tab.1 Chemical composition of Q235 carbon steel /%

表2 试验设计
Tab.2 Test design

表3 腐蚀试验环境<br/>Tab.3 Corrosion test environment

表3 腐蚀试验环境
Tab.3 Corrosion test environment

图1 盐雾试验箱内部<br/>Fig.1 Interior of salt spray test chamber

图1 盐雾试验箱内部
Fig.1 Interior of salt spray test chamber

图2 周浸试验箱内部<br/>Fig.2 Interior of alternate immersion test chamber

图2 周浸试验箱内部
Fig.2 Interior of alternate immersion test chamber

图3 模拟海洋大气环境碳钢试样腐蚀形貌<br/>Fig.3 Corrosion morphology of carbon steel sample in simulated marine atmospheric environment

图3 模拟海洋大气环境碳钢试样腐蚀形貌
Fig.3 Corrosion morphology of carbon steel sample in simulated marine atmospheric environment

图4 模拟工业大气环境碳钢试样腐蚀形貌<br/>Fig.4 Corrosion morphology of carbon steel sample in simulated industrial atmospheric environment

图4 模拟工业大气环境碳钢试样腐蚀形貌
Fig.4 Corrosion morphology of carbon steel sample in simulated industrial atmospheric environment

图5 试样表面微观形貌—模拟海洋大气环境<br/>Fig.5 Surface micromorphology of sample-simulated marine atmospheric environment

图5 试样表面微观形貌—模拟海洋大气环境
Fig.5 Surface micromorphology of sample-simulated marine atmospheric environment

图6 试样表面微观形貌—模拟工业大气环境<br/>Fig.6 Surface micromorphology of sample-simulated industrial atmospheric environment

图6 试样表面微观形貌—模拟工业大气环境
Fig.6 Surface micromorphology of sample-simulated industrial atmospheric environment

图7 试样腐蚀后表面形貌扫描结果(盐雾3 600 h)<br/>Fig.7 Scanning results of surface morphology of the sample after corrosion(Salt spray 3 600 h)

图7 试样腐蚀后表面形貌扫描结果(盐雾3 600 h)
Fig.7 Scanning results of surface morphology of the sample after corrosion(Salt spray 3 600 h)

图8 腐蚀试样断面形貌<br/>Fig.8 Cross section morphology of corrosion sample

图8 腐蚀试样断面形貌
Fig.8 Cross section morphology of corrosion sample

表4 试样蚀坑深度分布模型检验结果<br/>Tab.4 Test results of pitting depth distribution model

表4 试样蚀坑深度分布模型检验结果
Tab.4 Test results of pitting depth distribution model

图9 试样腐蚀深度与时间关系曲线<br/>Fig.9 Relation curves between corrosion depth and time of samples

图9 试样腐蚀深度与时间关系曲线
Fig.9 Relation curves between corrosion depth and time of samples

表5 模拟海洋大气与青岛海洋大气腐蚀灰色关联度<br/>Tab.5 Grey correlation degree between simulated marine atmosphere and Qingdao marine atmosphere corrosion

表5 模拟海洋大气与青岛海洋大气腐蚀灰色关联度
Tab.5 Grey correlation degree between simulated marine atmosphere and Qingdao marine atmosphere corrosion

表6 模拟海洋大气与万宁海洋大气腐蚀灰色关联度<br/>Tab.6 Grey correlation degree between simulated marine atmosphere and Wanning marine atmosphere corrosion

表6 模拟海洋大气与万宁海洋大气腐蚀灰色关联度
Tab.6 Grey correlation degree between simulated marine atmosphere and Wanning marine atmosphere corrosion

表7 模拟工业大气与江津工业大气腐蚀灰色关联度<br/>Tab.7 Grey correlation degree between simulated industrial atmosphere and Jiangjin industrial atmosphere corrosion

表7 模拟工业大气与江津工业大气腐蚀灰色关联度
Tab.7 Grey correlation degree between simulated industrial atmosphere and Jiangjin industrial atmosphere corrosion

表8 室内加速腐蚀与户外腐蚀相关性模型<br/>Tab.8 Correlation model between indoor accelerated corrosion and outdoor corrosion

表8 室内加速腐蚀与户外腐蚀相关性模型
Tab.8 Correlation model between indoor accelerated corrosion and outdoor corrosion

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期刊信息

西安建筑科技大学学报(自然科学版)
（1957年创刊双月刊）

主管单位：陕西省教育厅

主办单位：西安建筑科技大学

主　　编：刘加平（院士）

副主编：史庆轩（常务）闫增峰

国内刊号：CN61-1295/TU

I S S N：1006-7930

地　　址：西安市雁塔路中段13号

国内发行：西安建筑科技大学学报编辑部

国外发行：中国出版对外贸易总公司

编辑出版：西安建筑科技大学学报编辑部

备注

引言

1 试验概况

2 试验结果分析

3 碳钢室内模拟加速腐蚀与户外大气暴露的相关性

4 结论

期刊信息