摘要
为研究海洋浪溅区Q690高强钢材腐蚀行为和表面形貌分布特征,通过盐水周浸-湿热循环试验得到不同周期锈蚀试件,利用激光共聚焦显微镜(LSCM)采集表面的坐标参数,分析了微观形貌尺寸随着腐蚀周期的变化规律。结果表明:在腐蚀初始阶段,表面产生少量针状点蚀产物,金属色泽逐渐丧失,随着腐蚀损伤程度增加,材料表面点蚀形貌逐渐向坑蚀发展,处于腐蚀后期时,分布有大量层状产物,局部区域存在剥落现象。此外,根据微观扫描分析可知,表面堆积产物对基体内部具有较好保护作用,腐蚀行为沿着水平方向快速延伸,最终完全包裹试件表面,当腐蚀周期为100 d时,体积损失率和表面腐蚀高度分别为1.38%和840μm。
The surface of steel structural components exposed to extremely harsh environments is prone to rust, as a result, their normal service life is reduced, whilst the durability problem is increasingly prominent. Thus, the corrosion behavior and characteristics of surface morphology of Q690 high strength steel was assessed via alternative cyclic tests: immersion in artificial sea water, drying by indoor ventilation air and drying in atmosphere of 95%(±3%) relative humidity at 35 ℃, aiming to simulate the corrosive environment of ocean splash zone. Then, the variation of surface morphology with the progress of corrosion process and the corresponding surface coordinate parameters were collected by laser confocal microscope(LSCM). The results show that in the initial stage of corrosion, a small number of needle-like pits occurred on the surface, and the metallic luster was gradually lost. With the progress of corrosion process, the initial needle-like pits gradually developed toward large pits. At the later stage of corrosion,there exist a large number of lamellar corrosion products, and on which, exfoliations in some local areas could be observed. In addition, according to the microscopic scanning analysis, it could be seen that the cumulated corrosion products exhibited a good protective effect on the steel substrate, the corrosion process rapidly extended to the periphery and finally corrosion products completely covered the whole surface of steel specimen. When the corrosion period was 100 d, the volume loss rate and surface corrosion height were 1.38% and 840 μm, respectively.
作者
魏欢欢
郑东东
陈晨
张大伟
王凯励
WEI Huanhuan;ZHENG Dongdong;CHEN Chen;ZHANG Dawei;WANG Kaili(School of Architectural Engineering,Yangling Vocational&Technical College,Xianyang 712100,China;State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi'an University of Technology,Xi'an 710048,China;School of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710054,China;China Railway the First Survey and Design Institute Group Co.Ltd.,Xi'an 710043,China)
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2023年第1期186-190,共5页
Journal of Chinese Society For Corrosion and Protection
基金
国家自然科学基金(51978571)
杨凌职业技术学院2021年自然科学基金(ZK21-28)
西北旱区生态水利国家重点实验室资助基金(2017ZZKT-8)。
关键词
高强钢
浪溅区
湿热循环
微观形貌
腐蚀损伤
体积损失率
high strength steel
splash zone
damp-heat cycle
micro morphology
corrosion damage
volume loss rate
