高压低氧耦合环境下高强钛合金应力腐蚀敏感性研究

王凯; 张慧霞; 杜赵新; 刘峰; 张海兵; 马力

doi:10.7643/issn.1672-9242.2026.10.013

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装备环境工程 ›› 2026, Vol. 23 ›› Issue (10) : 113-122. DOI: 10.7643/issn.1672-9242.2026.10.013

船舶及海洋工程装备

高压低氧耦合环境下高强钛合金应力腐蚀敏感性研究

王凯^1,2, 张慧霞^2,*, 杜赵新¹, 刘峰², 张海兵², 马力²

作者信息 +

Stress Corrosion Susceptibility of High-strength Titanium Alloys in Coupled High-pressure and Low-oxygen Environments

WANG Kai^1,2, ZHANG Huixia^2,*, DU Zhaoxin¹, LIU Feng², ZHANG Haibing², MA Li²

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文章历史 +

摘要

目的探究高压与低氧耦合环境对高强度钛合金应力腐蚀敏感性的影响。方法采用动电位极化、电化学阻抗谱（EIS）、莫特-肖特基（Mott-Schottky）分析以及慢应变速率拉伸（SSRT）试验。通过模拟深海环境,在15 MPa静水压力下,研究TC4钛合金在不同溶解氧浓度（1、3、5 mg/L）海水中的电化学行为与力学性能,并与常压（0.1 MPa）海水环境进行对比。结果高压低氧环境会显著恶化钛合金的耐腐蚀性能。随着溶解氧浓度的降低,合金的自腐蚀电位负移,钝化膜电阻减小,膜内施主密度（N_D）显著增加,表明钝化膜缺陷增多,保护性下降。力学性能测试显示,在15 MPa和1 mg/L低氧耦合条件下,高强度钛合金的塑性损失最为严重,断后伸长率和断面收缩率均降至最低。断口分析表明,材料在所有条件下均发生韧性断裂,但在高压低氧环境下,韧窝变得更浅、更扁平,塑性变形能力明显变差。结论高压低氧环境通过促进析氢反应和形成缺陷更多的钝化膜,协同加剧了钛合金的应力腐蚀敏感性。

Abstract

The work aims to investigate the effects of the coupled high-pressure and low-oxygen environment on the stress corrosion sensitivity of high-strength titanium alloys. Potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), Mott-Schottky analysis and slow strain rate tensile (SSRT) tests were employed. By simulating a deep-sea environment, the electrochemical behavior and mechanical properties of TC4 titanium alloys in seawater with varying dissolved oxygen concentrations (1, 3 and 5 mg/L) were evaluated under a hydrostatic pressure of 15 MPa and compared with those in seawater at ambient pressure (0.1 MPa). The high-pressure and low-oxygen environment significantly deteriorated the corrosion resistance of the titanium alloy. As the dissolved oxygen concentration decreased, the self-corrosion potential shifted negatively, the resistance of the passive film decreased, and the donor density (N_D) within the film increased significantly, indicating an increase in passive film defects and a decline in its protective capability. Mechanical testing revealed that the plasticity loss of the high-strength titanium alloy was most severe under the 15 MPa and 1 mg/L low-oxygen conditions, with the elongation after fracture and the reduction of area reaching their minimum values. Fractographic analysis demonstrated that the material underwent ductile fracture under all conditions. However, in the high-pressure and low-oxygen environment, the dimples became shallower and flatter, indicating a significantly reduced plastic deformation capacity. Ultimately, the high-pressure and low-oxygen environment synergistically exacerbates the stress corrosion sensitivity of the titanium alloy by promoting the hydrogen evolution reaction and facilitating the formation of a more defective passive film.

导出引用

王凯, 张慧霞, 杜赵新, 刘峰, 张海兵, 马力. 高压低氧耦合环境下高强钛合金应力腐蚀敏感性研究[J]. 装备环境工程. 2026, 23(10): 113-122 https://doi.org/10.7643/issn.1672-9242.2026.10.013

WANG Kai, ZHANG Huixia, DU Zhaoxin, LIU Feng, ZHANG Haibing, MA Li. Stress Corrosion Susceptibility of High-strength Titanium Alloys in Coupled High-pressure and Low-oxygen Environments[J]. Equipment Environmental Engineering. 2026, 23(10): 113-122 https://doi.org/10.7643/issn.1672-9242.2026.10.013

中图分类号： TG172

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