Q690高强钢对接焊缝加速腐蚀试验研究

doi:10.11902/1005.4537.2021.191

中国腐蚀与防护学报

2022, Vol. 42

Issue (4): 675-680 DOI: 10.11902/1005.4537.2021.191

研究报告

本期目录 | 过刊浏览

Q690高强钢对接焊缝加速腐蚀试验研究

魏欢欢¹^,²(

), 雷天奇³, 郑东东²(

), 辛振科⁴

^1.杨凌职业技术学院建筑工程学院咸阳 712100
^2.西安理工大学西北旱区生态水利国家重点实验室西安 710048
^3.陕西铁路工程职业技术学院道桥与建筑学院渭南 714099
^4.甘肃省水利水电勘测设计研究院有限责任公司兰州 730000

Corrosion Characteristics of Butt Welds of Q690 High Strength Steel in Laboratory Test as an Enviormental Simulation of Ocean Splash Zone

WEI Huanhuan¹^,²(

), LEI Tianqi³, ZHENG Dongdong²(

), XIN Zhenke⁴

^1.School of Architectural Engineering, Yangling Vocational & Technical College, Xianyang 712100, China
^2.State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an 710048, China
^3.School of Road, Bridge & Architecture, Shaanxi Rallway Institute, Weinan 714099, China
^4.Gansu Institute of Water & Hydropower Engineering Investigation Design and Research, Lanzhou 730000, China

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摘要:

为研究Q690高强钢对接焊缝在海洋浪溅区的腐蚀特性,进行室内加速腐蚀实验,通过对不同周期下的表面宏观与微观腐蚀形貌的观察以及质量损失率、蚀坑尺寸和腐蚀速率等参数的测定,分析了试件损伤程度随腐蚀周期的变化规律。结果表明：随着腐蚀周期增加,金属光泽逐渐变暗,焊缝连接处分布较多锈蚀物,质地较为疏松,局部区域存在剥落现象；当腐蚀100 d后,试件质量损失率为8.46%。根据激光扫描共聚焦显微镜分析结果可知,表面堆积物能够抑制腐蚀沿深度方向延伸,腐蚀过程是由针状点蚀逐渐向坑蚀过渡,焊缝区、热影响区的蚀坑平均深度分别约为311.01和333.24 μm。研究结果对于海洋环境下国产高强钢耐久性评估具有重要意义。

关键词 ： Q690高强钢, 对接焊缝, 海洋浪溅区, 微观扫描, 质量损失率, 耐久性

Abstract：

The corrosion characteristics of butt welds of Q690 high strength steel in the ocean splash zone was studied via laboratory simulation with a desired accelerated corrosion scheme of cyclic immersion in artificial seawater and maintenance in hot and humid chamber, in terms of the macroscopic and microscopic corrosion morphology, mass loss, pit size, and corrosion depth etc., so that to acquire the corrosion regulation of the steel. The results show that as the corrosion cycle increases, the metal luster gradually darkens, more rusts emerge on the weld joints, the formed rust rather loose with pelling off can be seen at local areas. After 100 d of corrosion, the mass loss rate of the steel is 8.46%. The observation results of laser scanning confocal microscope (LSCM) show that surface deposits can inhibit corrosion from extending along the depth direction. The corrosion process gradually transforms from needle-like corrosion spots to corrosion pits, the average depths of pits in the weld zone and heat affected zone are about 311.01 and 333.24 μm, respectively. The research results are of great significance for the durability evaluation of domestic high strength steel in marine environment.

Key words： Q690 high strength steel butt weld ocean splash zone microscopic scan mass loss rate durability

收稿日期: 2021-08-10

ZTFLH:

TU511.3

基金资助:国家自然科学基金(51978571);杨凌职业技术学院自然科学基金(ZK21-28)

通讯作者: 魏欢欢,郑东东 E-mail: wh0402@qq.com;2512978427@qq.com

Corresponding author: WEI Huanhuan,ZHENG Dongdong E-mail: wh0402@qq.com;2512978427@qq.com

作者简介: 魏欢欢,男,1996年生,硕士,助教

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引用本文:

魏欢欢, 雷天奇, 郑东东, 辛振科. Q690高强钢对接焊缝加速腐蚀试验研究[J]. 中国腐蚀与防护学报, 2022, 42(4): 675-680.
Huanhuan WEI, Tianqi LEI, Dongdong ZHENG, Zhenke XIN. Corrosion Characteristics of Butt Welds of Q690 High Strength Steel in Laboratory Test as an Enviormental Simulation of Ocean Splash Zone. Journal of Chinese Society for Corrosion and protection, 2022, 42(4): 675-680.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.191 或 https://www.jcscp.org/CN/Y2022/V42/I4/675

图1 试件尺寸

图2 腐蚀后样品的LSCM分析区域

图3 经不同周期腐蚀后试件的表面形貌图

表1 质量损失率计算结果

图4 腐蚀周期与质量损失率的关系

图5 经不同周期腐蚀后试件表面LSCM扫描形貌

表2 扫描区域腐蚀深宽比

表3 焊缝区和热影响区的平均腐蚀速率

图6 蚀坑尺寸与腐蚀时间关系

图7 腐蚀试件t-ηs-ξ关系曲面

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