摘要
目的研究深海静水压力对焊接接头腐蚀的影响,探清腐蚀机制。方法采用腐蚀微观形貌观察、腐蚀产物分析与电化学表征相结合的方法,研究高强钢焊接接头在常压低温海水与深海环境中的腐蚀行为。结果静水压力增加会加剧Ni-Cr-Mo-V高强钢焊接接头的腐蚀。高强钢焊接接头在常压低温海水和深海环境中的腐蚀速率随腐蚀时间增加呈现出前期迅速减小、后期变缓的变化趋势。高强钢焊接接头在海水中浸泡不同周期的腐蚀产物主要有α-Fe_(2)O_(3)、γ-FeOOH、α-FeOOH和Fe_(3)O_(4)。高强钢焊接接头在低温海水环境下,表面主要发生以腐蚀坑合并为趋势的全面腐蚀,而在深海环境下主要发生的是局部腐蚀。结论不同静水压力使得高强钢焊接接头的腐蚀规律发生变化,进而影响了其腐蚀速率。
In deep-sea environment,high-strength steel welded joints often suffer from various types of corrosion,such as pitting corrosion and stress corrosion.The work aims to study the effect of deep sea hydrostatic pressure on the corrosion of welded joints and explore the corrosion mechanism.Methods such as corrosion microstructure observation,corrosion product analysis,and electrochemical characterization were combined to study the corrosion behavior of high-strength steel welded joints in low-temperature seawater and deep sea environments.The results indicated that,the increase of hydrostatic water pressure would exacerbate the corrosion of Ni-Cr-Mo-V high strength steel welded joints.The corrosion rate of high-strength steel welded joints in low-temperature seawater and deep-sea environments showed a trend of rapid decrease in the early stage and later slowing down with the increase of corrosion time.The main corrosion products on high-strength steel welded joints after immersing in seawater for different periods wereα-Fe_(2)O_(3),γ-FeOOH,α-FeOOH and Fe_(3)O_(4).High strength steel welded joints suffered comprehensive corrosion,mainly with a trend of uniform corrosion pits merging,on the surface in low-temperature seawater environments,while localized corrosion mainly occurred in deep-sea environments.Different hydrostatic pressures cause changes in the corrosion pattern of high-strength steel welded joints,which in turn affects their corrosion rate.
作者
彭文山
李金泽
胡娜
王萍
曹学文
侯健
PENG Wenshan;LI Jinze;HU Na;WANG Ping;CAO Xuewen;HOU Jian(National Key Laboratory of Marine Corrosion and Protection,Luoyang Ship Material Research Institute,Shandong Qingdao 266237,China;PipeChina Engineering Technology Innovation Co.,Ltd.,Tianjin 300450,China;College of New Energy,China University of Petroleum(East China),Shandong Qingdao 266580,China;College of Pipeline and Civil Engineering,China University of Petroleum(East China),Shandong Qingdao 266580,China;School of Architecture and Engineering,Qingdao Binhai University,Shandong Qingdao 266555,China)
出处
《装备环境工程》
CAS
2024年第10期118-126,共9页
Equipment Environmental Engineering
关键词
深海
高强钢
焊接接头
腐蚀
电化学
腐蚀产物
deep sea
high strength steel
welding joints
corrosion
electrochemistry
corrosion products
