基于多物理场耦合的大气环境下碳钢点蚀演化及速率预测模型

doi:10.11896/cldb.23060012

材料导报

2024, Vol. 38

Issue (19): 23060012-7 https://doi.org/10.11896/cldb.23060012

金属与金属基复合材料

基于多物理场耦合的大气环境下碳钢点蚀演化及速率预测模型

姜绍飞^1,*, 林金星¹, 宋华霖¹, 王威¹, 陈敏文²

1 福州大学土木工程学院,福州 350108
2 海峡(福建)交通工程设计有限公司,福州 350001

Evolution and Rate Prediction Model of Pitting of Carbon Steel in Atmospheric Environment Based on Multiphysical Fields

JIANG Shaofei^1,*, LIN Jinxing¹, SONG Hualin¹, WANG Wei¹, CHEN Minwen²

1 College of Civil Engineering, Fuzhou University, Fuzhou 350108, China
2 Haixia (Fujian) Transportation Engineering Design Co., Ltd., Fuzhou 350001, China

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摘要为揭示大气环境下碳钢点蚀演化规律,基于电化学腐蚀机理,耦合三次电流分布、物质传递和变形几何多物理场建立碳钢点蚀演化的数值模型。基于此,分析pH值、NaCl浓度和相对湿度(Relative humidity,RH)对点蚀速率的影响并建立点蚀速率预测模型。研究表明:点蚀形态由初始圆锥形向半球形转变,最后发展成圆柱状;pH值处于6.0~7.0范围内,碳钢点蚀速率出现明显下降,最大降幅为23.96%;NaCl浓度在0.5%~1%(质量分数)时,增加NaCl浓度对点蚀速率提升明显,最大增幅为10%;碳钢点蚀速率在RH为72%~77%内存在极值;点蚀速率预测值与试验值误差在5%以内。以上表明本工作建立的数值模型和预测公式可用于碳钢点蚀演化和速率预测。

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关键词: 点蚀演化 COMSOL Multiphysics 大气环境碳钢腐蚀速率

Abstract: To reveal the evolution law of the pitting of carbon steel in the atmospheric environment, a numerical model of pitting was established on the basis of the electrochemical corrosion mechanism. Meanwhile, it is also coupled with tertiary current distribution, material transfer and deformation geometry multiphysics fields. Based on the validated numerical model, an analysis was conducted by the effects of pH, NaCl concentration and relative humidity (RH) on the pitting rate. Furthermore, the prediction model of pitting rate was established. The results show that the pitting shape changes from conical to hemispherical and ultimately develops into a cylindrical shape. When the pH value is in the range of 6.0 to 7.0, the pitting rate remarkably decreases, with the maximum reduction being 23.96%. When the NaCl concentration falls within the range of 0.5% to 1% (mass fraction), an increase in NaCl concentration significantly impacts the pitting rate, with a maximum increment of 10%. When the RH ranges from 72% to 77%, the pitting rate of carbon steel exhibits an exceptionally high level. The error between the predicted pitting rate and the test is less than 5%. These indicate that the numerical model and prediction formula established in this work are applicable to predicting the pitting evolution process and pitting rate of carbon steel.

Key words: pitting evolution COMSOL Multiphysics atmospheric environment carbon steel corrosion rate

出版日期: 2024-10-10 发布日期: 2024-10-23

ZTFLH:

TU513

基金资助: 国家十三五重点专项课题(2020YFD1100403);中国地震局重点专项(2020EEEVL0402)

通讯作者: ^*姜绍飞,通信作者,博士、福州大学二级教授、博士研究生导师、百千万人才工程国家级人选、国务院政府特殊津贴专家、福建省闽江学者特聘教授、福建省特支计划百千万工程领军人才,现任土木工程防震减灾信息化国家工程中心副主任和结构工程研究所所长。1997年东北大学博士毕业。目前主要从事结构健康监测与智能运维、传统风貌建筑保护与性能提升、城市更新(既有建筑改造与加固)、智能传感与AI信息技术方面的研究。主持国家基金5项、国家重点专项课题1项、国家重点专项专题4项以及其他国家省部级项目20余项。出版著作6部,发表学术论文200余篇,被SCI/EI收录140篇次。cejsf@fzu.edu.cn

引用本文:

姜绍飞, 林金星, 宋华霖, 王威, 陈敏文. 基于多物理场耦合的大气环境下碳钢点蚀演化及速率预测模型[J]. 材料导报, 2024, 38(19): 23060012-7.
JIANG Shaofei, LIN Jinxing, SONG Hualin, WANG Wei, CHEN Minwen. Evolution and Rate Prediction Model of Pitting of Carbon Steel in Atmospheric Environment Based on Multiphysical Fields. Materials Reports, 2024, 38(19): 23060012-7.

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http://www.mater-rep.com/CN/10.11896/cldb.23060012 或 http://www.mater-rep.com/CN/Y2024/V38/I19/23060012

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