CAJ | 학술논문

目的：研究不同极化电位下高强钢焊接件在海水中的应力腐蚀敏感性。方法采用慢应变速率试验（SSRT）和电化学阻抗技术来判定不同极化电位条件下高强钢焊接件在海洋环境中应力腐蚀敏感性的大小，利用扫描电镜和三维视频测试技术观察试样断裂处的颈缩情况和断裂方式。结果在Ecor~-0.9 V电位区间内，高强钢焊接件在海水中没有明显的应力腐蚀敏感性；在-1.1~-1.2 V电位区间内，焊接件断口出现脆性断裂特征，力学性能下降明显，具有很强的应力腐蚀敏感性。结论阴极极化对高强钢焊接件在海水中的应力腐蚀敏感性影响显著。
목적：연구불동겁화전위하고강강한접건재해수중적응력부식민감성。방법채용만응변속솔시험（SSRT）화전화학조항기술래판정불동겁화전위조건하고강강한접건재해양배경중응력부식민감성적대소，이용소묘전경화삼유시빈측시기술관찰시양단렬처적경축정황화단렬방식。결과재Ecor~-0.9 V전위구간내，고강강한접건재해수중몰유명현적응력부식민감성；재-1.1~-1.2 V전위구간내，한접건단구출현취성단렬특정，역학성능하강명현，구유흔강적응력부식민감성。결론음겁겁화대고강강한접건재해수중적응력부식민감성영향현저。
Objective To study the stress corrosion cracking behaviors of high-strength low-alloy steel in seawater under different cathodic polarization potentials. Methods Slow strain rate tests (SSRT),electrochemical impedance spectroscopy(EIS)were used to study the effect of cathodic polarization on stress corrosion cracking susceptibility,scanning electron microscopy (SEM) and Microscopic three-dimensional screen research tools were used to study the necking and fracture surface of samples. Results There is no stress corrosion cracking susceptibility under the Ecor~-0.9 V potential,and high stress corrosion cracking susceptibility under the-1.1~-1.2 Vpotential. Conclusion Cathodic polarization showed significant influence on the stress corrosion cracking behavior of weld high strength low alloy steel in seawater.