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

doi:10.11900/0412.1961.2023.00087

金属学报

2025, Vol. 61

Issue (2): 309-322 DOI: 10.11900/0412.1961.2023.00087

研究论文

本期目录 | 过刊浏览

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

宋昱杉¹, 刘叡¹(

), 崔宇², 刘莉¹(

), 王福会¹

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

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

SONG Yushan¹, LIU Rui¹(

), CUI Yu², LIU Li¹(

), WANG Fuhui¹

1 Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China
2 Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

宋昱杉, 刘叡, 崔宇, 刘莉, 王福会. 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[J]. 金属学报, 2025, 61(2): 309-322.
Yushan SONG, Rui LIU, Yu CUI, Li LIU, Fuhui WANG. Stress Corrosion Behavior of Ni-Cr-Mo-V Steel in 3.5%NaCl Solution Under the Interaction of Hydrostatic Pressure and Tensile Stress[J]. Acta Metall Sin, 2025, 61(2): 309-322.

全文: PDF(7369 KB) HTML

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⁺。

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

Abstract：

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. High-strength 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 pressure and tensile stress affect the electric double layer at the metal-solution interface and subsequently promote the hydrolysis of metal cations, increasing the H⁺ concentration near the alloy surface. Additionally, the fracture mode of Ni-Cr-Mo-V steel in 3.5%NaCl solution is independent of the hydrostatic pressure; however, the hydrostatic pressure determines the shallow and small structure of the dimples in the fracture.

Key words： Ni-Cr-Mo-V steel deep-sea corrosion hydrostatic pressure stress corrosion cracking electric double layer

收稿日期: 2023-03-02

ZTFLH:

TG174.4

基金资助:国家重点研发计划项目(2022YFB3808800);中国博士后科学基金项目(2021M700711);国家自然科学基金项目

通讯作者: 刘叡，liurui@mail.neu.edu.cn，主要从事深海极端环境金属的腐蚀与防护研究;
刘莉，liuli@mail.neu.edu.cn，主要从事深海极端环境金属的腐蚀与防护研究

Corresponding author: LIU Rui, associate professor, Tel: 18842505442, E-mail: liurui@mail.neu.edu.cn
LIU Li, professor, Tel: 15904072057, E-mail: liuli@mail.neu.edu.cn

作者简介: 宋昱杉，男，1997年生，硕士生

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图1 慢应变速率拉伸(SSRT)实验样品几何尺寸图及用于电化学测试的U形弯曲加载试样和原始试样示意图

图2 模拟深海环境SSRT测试系统和模拟深海环境电化学测试系统示意图

图3 原始Ni-Cr-Mo-V钢显微组织的SEM二次电子像和OM像

图4 Ni-Cr-Mo-V钢在不同环境中进行SSRT实验后得到的应变-应力曲线、断裂伸长率和断裂强度

图5 Ni-Cr-Mo-V钢在不同环境中经过SSRT实验后的断口侧面形貌

图6 Ni-Cr-Mo-V钢在不同环境中经过SSRT实验后的断口表面形貌

图7 Ni-Cr-Mo-V钢在不同环境中经过SSRT实验后的断口纤维区裂纹

图8 断口纤维区裂纹的尺寸统计及平均值

图9 Ni-Cr-Mo-V钢经过应变速率为1 × 10-6 s-1的SSRT实验后的断口放大像

图10 Ni-Cr-Mo-V钢经过应变速率为5 × 10-6 s-1的SSRT实验后的断口放大像

图11 未变形和变形Ni-Cr-Mo-V钢在3.5%NaCl溶液中的局部腐蚀形貌

图12 不同条件中的点蚀坑尺寸概率分布

图13 Ni-Cr-Mo-V钢在不同条件下的微分电容曲线

图14 Ni-Cr-Mo-V钢在不同条件下的线性极化曲线、线性极化电阻和腐蚀电流密度

图15 Ni-Cr-Mo-V钢经过应变速率为1 × 10-6的SSRT实验后的侧面形貌放大图

图16 静水压力环境中Ni-Cr-Mo-V钢应力腐蚀开裂示意图

图17 不同环境中Ni-Cr-Mo-V钢表面金属离子水解产生的H+的浓度

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