Hydrogen trapping behavior of V–N microalloyed X80 pipeline steels was studied by means of hydrogen permeation and hydrogen induced cracking (HIC) tests. In addition, the electrochemical performance of the steels in 3.5 wt.% NaCl solution was investigated. Results indicated that the microstructure of experimental steels mainly consisted of acicular ferrite and polygonal ferrite (PF). When the fraction of PF was 9.1% and 30.4%, hydrogen effective diffusion coefficient was 1.624 × 10⁻⁶ and 3.121 × 10⁻⁶ cm²/s, respectively. The pipeline steels were not susceptible to HIC. Numerous potential hydrogen traps distributed in homogeneous dispersion were conducive to high HIC resistance. With increasing the fraction of PF from 9.1% to 30.4%, the corrosion current density increased from 5.39 × 10⁻⁶ to 9.49 × 10⁻⁶ A cm⁻², the corrosion potential decreased from − 0.48 to − 0.57 V, and the charge transfer resistance decreased from 2301 to 2068 Ω cm², respectively. Increased fraction of PF was disadvantageous for corrosion resistance because of galvanic corrosion.

通过氢渗透和氢致开裂 (HIC) 试验研究了 V-N 微合金化 X80 管线钢的氢俘获行为。此外，还研究了钢在 3.5 wt.% NaCl 溶液中的电化学性能。结果表明，实验钢的显微组织主要由针状铁素体和多边形铁素体（PF）组成。当PF比例为9.1%和30.4%时，氢有效扩散系数分别为1.624×10 ^-6和3.121×10 ^-6 cm ²/s，分别。管线钢对 HIC 不敏感。大量分布在均匀分散中的潜在氢陷阱有利于高 HIC 阻力。随着 PF 比例从 9.1% 增加到 30.4%，腐蚀电流密度从 5.39 × 10 ^-6增加到 9.49 × 10 ^-6 A cm ^-2，腐蚀电位从 - 0.48 下降到 - 0.57 V，电荷转移电阻分别从 2301 降低到 2068 Ω cm ²。由于电偶腐蚀，PF分数的增加不利于耐腐蚀性。