静水压力和拉伸应力交互作用下Ni-Cr-Mo-V钢在3.5%NaCl溶液中的应力腐蚀行为  

Stress Corrosion Behavior of Ni-Cr-Mo-V Steel in 3.5%Na Cl Solution Under the Interaction of Hydrostatic Pressure and Tensile Stress

作　　者：宋昱杉 刘叡 崔宇 刘莉[1] 王福会[1] SONG Yushan;LIU Rui;CUI Yu;LIU Li;WANG Fuhui(Shenyang National Laboratory for Materials Science,Northeastern University,Shenyang 110819,China;Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]东北大学沈阳材料科学国家研究中心东北大学联合研究分部,沈阳110819 [2]中国科学院金属研究所师昌绪先进材料创新中心,沈阳110016

出　　处：《金属学报》2025年第2期309-322,共14页Acta Metallurgica Sinica

基　　金：国家重点研发计划项目,No.2022YFB3808800;中国博士后科学基金项目,No.2021M700711;国家自然科学基金项目,No.U20b2026。

摘　　要：Ni-Cr-Mo-V钢在深海环境的长期服役过程中会受到复杂力学环境的影响,可能会引发严重的腐蚀失效。为探究静水压力环境中Ni-Cr-Mo-V钢的应力腐蚀开裂敏感性,采用电化学测试方法、微观形貌表征手段和慢应变速率拉伸实验研究了静水压力和拉伸应力交互作用下Ni-Cr-Mo-V钢的局部腐蚀行为和应力腐蚀行为。结果表明,静水压力和拉伸应力交互作用对Ni-Cr-Mo-V钢局部腐蚀行为的双重作用会影响其应力腐蚀行为。一方面,拉伸应力与静水压力的交互作用加速了点蚀坑的扩展,并影响了腐蚀产物在基体表面的附着。另一方面,静水压力和拉伸应力促进了金属离子在Ni-Cr-Mo-V钢表面的水解,从而导致金属表面积累更多的H+。With the promotion of the deep-sea strategy of China,the safety of metallic structural materials in deep sea is considered critical for development of deep-sea engineering equipment.Highstrength low-alloy(HSLA)steel is widely used in pressure hulls of deep-sea submarines and oil platforms.However,HSLA steel is affected by the complex mechanical environment during its long-term service in the deep sea,leading to severe corrosion failure.Therefore,research on the effects of the hydrostatic pressure and tensile stress in deep sea on the stress corrosion behavior of HSLA steel is beneficial for the development,application,and lifetime prediction of deep-sea engineering equipment.Here,experiments were conducted using Ni-Cr-Mo-V steel,and the electrochemical measurement system and slow strain rate tensile(SSRT)test system in a simulated deep-sea environment were established in laboratory.The electric double-layer structure at the metal-solution interface was investigated using the differential capacitance curve,and the corrosion current density of the alloy was characterized with the linear polarization curve.The morphology of pits at local corrosion sites and fracture after the SSRT test were observed through SEM,and the size of the pits was analyzed using white-light interferometry.The stress corrosion cracking(SCC)sensitivity of the alloy was studied utilizing the SSRT test.The effects of the hydrostatic pressure and deformation on the concentration of H+near the alloy surface were determined via the hydrolysis of metal cations.The results illustrated that the hydrostatic pressure can improve the SCC susceptibility of Ni-Cr-Mo-V steel in 3.5%NaCl solution,which can be affected by the dual effects of the interaction of the hydrostatic pressure and tensile stress on the local corrosion behavior.On the one hand,the interaction of the tensile stress and hydrostatic pressure affects the expansion and structure of pits and suppresses the adhesion of corrosion products to the alloy surface.On the other hand,the hydrostatic

关 键 词：Ni-Cr-Mo-V钢 深海腐蚀 静水压力 应力腐蚀开裂 双电层 

分 类 号：TG174.4[金属学及工艺—金属表面处理]