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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

42卷

期数:

2025年05期

页码:

115-124

栏目:

建筑材料

出版日期:

2025-09-30

文章信息/Info

Title:

Study on corrosion morphology and tensile properties of Q345qDNH steel after corrosion

文章编号:

1673-2049(2025)05-0115-10

作者:

袁卓亚¹,王熙溪²,袁阳光^1,3,翟晓亮¹,杨飞⁴,侯旭¹,谢陶冶³

(1. 中交第一公路勘察设计研究院有限公司,陕西 西安 710068; 2. 长安大学 公路学院,陕西 西安 710064; 3. 西安建筑科技大学 土木工程学院,陕西 西安 710055; 4. 长安大学 建筑工程学院,陕西 西安 710061)

Author(s):

YUAN Zhuoya¹, WANG Xixi², YUAN Yangguang^1,3, ZHAI Xiaoliang¹, YANG Fei⁴, HOU Xu¹, XIE Taoye³

(1. CCCC First Highway Consultants Co., Ltd., Xi'an 710068, Shaanxi, China; 2. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 3. College of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China; 4. College of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China)

关键词:

Q345qDNH钢材;  锈蚀形貌;  拉伸性能;  试验研究

Keywords:

Q345qDNH steel;  corrosion morphology;  tensile property;  experimental study

分类号:

TU317

DOI:

10.19815/j.jace.2024.03040

文献标志码:

A

摘要:

为研究Q345qDNH钢材的宏观及微观锈蚀形貌,明确其锈蚀后的拉伸性能,开展了弱酸环境及自然暴露环境下的锈蚀试验,分析其宏观锈蚀形貌; 采用工业CT扫描和能谱仪(EDS)观测其微观形貌和表面锈蚀物构成,阐释钢材耐蚀机理; 对4种不同锈蚀状态的Q345qDNH钢材开展拉伸试验,获得全过程应力-应变曲线,研究锈蚀状态对弹性模量及拉伸性能的影响。结果表明:Q345qDNH钢材在弱酸环境下首先出现橙黄色锈蚀产物并逐渐过渡为黑褐色,自然暴露下以橙黄色锈蚀产物为主,锈蚀失重率随时间延长近似呈线性变化; 弱酸环境下Q345qDNH钢材微观锈蚀形貌由颗粒状逐渐变为松散、多孔镂空状,早期锈蚀产物中可见γ-FeOOH发育,锈蚀后期颗粒状氧化物增加,并有α-FeOOH生成; 自然暴露下早期微观锈蚀形貌呈松散、颗粒状,锈蚀物中存在γ-FeOOH; 随锈蚀发展,表面锈蚀产物中Fe、O含量先波动变化后趋于稳定,合金元素含量呈总体下降趋势; 锈蚀过程中Cr在锈蚀产物中重新分配; 锈蚀初期,Q345qDNH钢材抵抗变形能力变化不大; 随锈蚀程度加深,Q345qDNH钢材屈服强度、抗拉强度均呈线性下降趋势,且二者下降速率近似相等; 钢材延性在锈蚀初期下降明显,后趋于稳定; 一般大气环境下Q345qDNH钢材致密稳定锈层的形成约需1.3年; 致密稳定锈层形成时,钢材抗变形能力下降8.21%,上屈服强度及抗拉强度较初始状态分别下降4.6%、4.5%,断后伸长率、最大力塑性延伸率较初始状态分别下降35.1%、15.1%。

Abstract:

In order to investigate the macroscopic and microscopic corrosion morphology of Q345qDNH steel and to determine its tensile properties after corrosion, the corrosion tests were conducted in weak acid and natural exposure environments to analyze the macroscopic corrosion morphology. The industrial CT scanning and energy-dispersive spectroscopy(EDS)were employed to observe the microscopic morphology and surface corrosion product composition, elucidating the corrosion resistance mechanism of steel. The tensile tests were performed on Q345qDNH steel specimens in four different corrosion states to obtain stress-strain curves throughout the process and study the influence of corrosion on elastic modulus and tensile properties. The results show that Q345qDNH steel initially forms orange-yellow corrosion products in weak acid environments, gradually transitioning to black-brown. Under natural exposure, the predominant corrosion product is orange-yellow. The weight loss rate approximately follows a linear increase with time. Under weak acid conditions, the microscopic corrosion morphology of Q345qDNH steel changes from granular to loose and porous over time. Early-stage corrosion products show the development of γ-FeOOH, with an increase in granular oxide particles and the generation of α-FeOOH in later stages. Under natural exposure, early-stage microscopic corrosion morphology appears loose and granular, with the presence of γ-FeOOH in the corrosion product. As corrosion progresses, Fe and O content in surface corrosion products initially fluctuate before stabilizing, while alloy element content shows an overall decreasing trend. Cr redistributes within the corrosion product during the corrosion process. Initially, there is minimal change in the deformation resistance of Q345qDNH steel. However, as corrosion deepens, both yield strength and tensile strength exhibit a linear decline, with similar rates of decrease. Ductility decreases significantly in the early stages of corrosion but stabilizes later. Formation of a dense and stable rust layer in typical atmospheric conditions takes approximately 1.3 years for Q345qDNH steel. When a dense and stable rust layer forms, the steel's deformation resistance decreases by 8.21%, while yield strength and tensile strength decrease by 4.6% and 4.5% respectively compared to initial conditions. Additionally, elongation after fracture and maximum plastic elongation decrease by 35.1% and 15.1% respectively compared to initial conditions.

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相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2024-03-15 投稿网址:http://jace.chd.edu.cn
基金项目:国家自然科学基金青年科学基金项目(52308200); 陕西省自然科学基础研究计划项目(2023-JC-YB-321); 陕西省教育厅专项科研项目(23JK0519)
作者简介:袁卓亚(1971-),女,工学博士,正高级工程师,E-mail:791027696@qq.com。
通信作者:王熙溪(2000-),女,工学博士研究生,E-mail:wangxx@chd.edu.cn。
Author resumes: YUAN Zhuoya(1971-), female, PhD, professor of engineer, E-mail: 791027696@qq.com; WANG Xixi(2000-), female, doctoral student, E-mail: wangxx@chd.edu.cn.

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更新日期/Last Update: 2025-09-25