Abstract This study aimed to develop weathering steel bolts (WSB) to solve galvanic corrosion problems between weathering steel and hot-dip galvanised bolts (HGB). A weathering steel wire rod for a cold-forming bolt was produced and then processed into grade 8.8 WSB. The microstructures, mechanical properties, and corrosion properties of the WSB were investigated by metallography, tensile, toughness, and cyclic immersion corrosion tests (simulated industrial atmospheric environment). A galvanic corrosion evaluation experiment was used to study the galvanic effect. The results revealed that the final microstructure of WSB was tempered sorbite. The tensile properties, wedge load, proof load, impact toughness, and hardness of WSB not only met the standard requirements of ISO 898.1 but also showed good comprehensive mechanical properties. The corrosion rates of the cylinder WSB, cylinder 20MnTiB steel bolt (MSB), and cylinder Q355 hot-rolled weathering angle steel (WAS) after 240 h cyclic immersion corrosion were 1.45, 2.34, and 1.81 g/m2·h, respectively. The results showed that the corrosion resistance of WSB was superior to that of MSB and slightly better than that of WAS. The difference between the galvanic couple potentials of the coupled WSB–WAS was 14 mV, which means that the galvanic corrosion effect can be ignored.

中文翻译：

---

输电铁塔耐候钢螺栓的研究

摘要 本研究旨在开发耐候钢螺栓（WSB），以解决耐候钢与热镀锌螺栓（HGB）之间的电偶腐蚀问题。生产冷成型螺栓用耐候钢盘条，然后加工成8.8级WSB。通过金相、拉伸、韧性和循环浸渍腐蚀试验（模拟工业大气环境）研究了 WSB 的微观结构、机械性能和腐蚀性能。电偶腐蚀评价实验用于研究电偶效应。结果表明，WSB 的最终显微组织为回火索氏体。WSB的拉伸性能、楔载荷、保证载荷、冲击韧性和硬度不仅满足ISO 898.1的标准要求，而且表现出良好的综合力学性能。筒体WSB、筒体20MnTiB钢螺栓（MSB）和筒体Q355热轧耐候角钢（WAS）在240 h循环浸泡腐蚀后的腐蚀速率分别为1.45、2.34和1.81 g/m2·h。结果表明，WSB的耐腐蚀性能优于MSB，略优于WAS。耦合 WSB-WAS 的电偶电位差为 14 mV，这意味着电偶腐蚀效应可以忽略不计。