Bian Meihua,Peng Jianing*,He Yuyin,et al.A rapid evaluation method for corrosion resistance of galvanized steel layer for transmission tower materials[J].Plating & Finishing,2025,(02):54-60.
doi: 10.3969/j.issn.1001-3849.2025.02.008输电杆塔材料镀锌钢层耐腐蚀性的快速评价探究
- Title:
- A rapid evaluation method for corrosion resistance of galvanized steel layer for transmission tower materials
- 分类号:
- TQ139.1
- 文献标志码:
- A
- 摘要:
- 输电杆塔是输电线路的重要部分，它在服役过程中需要承受诸多荷载，特别是在工业区和沿海地区，输电杆塔材料的腐蚀问题尤为突出，产生了极大的安全隐患。采用自制的定点腐蚀装置及室内浸泡腐蚀试验方法，将镀锌钢表面的锌镀层在酸性腐蚀溶液中溶解，游离出的亚铁离子(Fe2+)被氧化剂氧化为Fe3+；通过Fe3+与磺基水杨酸(SSal)发生显色反应，利用分光光度计在线检测溶液中的Fe3+；通过游离出Fe3+所需要的时间来评价镀锌层的耐腐蚀性能；利用扫描电镜(SEM)和X射线衍射仪(XRD)分析镀锌钢表面腐蚀产物的形貌和组成。结果显示：腐蚀溶溶pH＝1.0～3.0时，可在3 h内评价镀锌钢的耐腐蚀性能，该研究为输电杆塔的合理选材和预测材料寿命提供了重要参考。
- Abstract:
- Transmission tower is an important part of the transmission line, it needs to bear a lot of loads in the service process, especially in industrial areas and coastal areas, the corrosion of transmission tower materials is particularly prominent, resulting in great security risks. The corrosion behavior of galvanized layer on the surface of galvanized steel structural parts of power grid equipment was studied by using a self-made fixed point corrosion device and indoor immersion corrosion test method. The zinc coating on the surface of galvanized steel was dissolved in acid corrosion solution, and the free ferrous ions (Fe2+) were oxidized to Fe3+ by oxidants. The chromogenic reaction of Fe 3+ with sulfosalicylic acid ( SSal) was carried out to detect Fe3+ in the solution by spectrophotometer. The corrosion resistance of galvanized layer was evaluated by the time required for Fe 3+ ionization. The surface corrosion morphology and composition of corrosion product of galvanized steel were studied by scanning electron microscopy (SEM) and X-ray diffractometer (XRD). The results show that when the pH of corrosion solution is 1.0-3.0, the corrosion resistance of the galvanized steel plate commonly used in the market can be evaluated within 3 h. This study provides an important reference for reasonable material selection and material life prediction of transmission tower
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