NY-400型耐张线夹内部交流腐蚀形貌及产物研究
发布时间：2018-10-13 11:18
【摘要】：目的研究老旧高压输电耐张线夹内部交流腐蚀。方法截取已运行35 a的耐张线夹并解剖,采用扫描电子显微镜分析腐蚀区的微观形貌,采用X射线衍射仪、能谱仪和X射线光电子能谱仪对腐蚀区元素及物相进行分析鉴定,分析线夹内部腐蚀损伤演化过程。结果线夹内表面与铝线表面局部出现大量白色腐蚀产物和黑色覆盖物,白色腐蚀物呈粉末和片层两种形态。分析表明,腐蚀产物相组成为Al2O3,Al O(OH)和Al OOH;黑色覆盖物随深度增加而减少,黑色区域主要元素为Al,O和C,物相组成为Al2O3,C(graphite)和含C有机物。钢芯锌层破坏区的内层铝线更易腐蚀,腐蚀区呈灰黑色,微观形貌为富铁元素颗粒镶嵌在其它腐蚀产物中,区域的主要元素为Al,C,O,Fe和Zn,Fe元素存在形式为Fe2O3;钢芯表面镀锌层局部腐蚀严重,呈现平面型点蚀形貌,主要元素为Zn,Al,C和O,Zn腐蚀产物为六边纤锌矿结构Zn O。结论内部交流腐蚀原因为液体渗入,同时腐蚀产生大量的热致使材料分解。
[Abstract]:Aim to study the internal AC corrosion resistance of tension clamp in old high voltage transmission line. Methods the tensile clamp which had been running for 35 years was intercepted and dissected. The microstructure of the corrosion zone was analyzed by scanning electron microscope (SEM). The elements and phases of the corrosion zone were analyzed and identified by X-ray diffractometer, energy spectrometer and X-ray photoelectron spectrometer. The evolution process of corrosion damage inside the clamp is analyzed. Results A large number of white corrosion products and black coverings were found on the inner surface of the wire clip and the surface of the aluminum wire, and the white corrosion materials were in the form of powder and lamellar. The results show that the phase composition of the corrosion products is Al2O3,Al O (OH) and Al OOH; black coverings decrease with the increase of depth, the main elements in the black area are Al,O and C, and the phase compositions are Al2O3,C (graphite) and C-containing organic compounds. The inner layer aluminum wire in the damage zone of steel core zinc layer is more susceptible to corrosion, and the corrosion zone is gray-black, and the microcosmic appearance is iron rich element particles embedded in other corrosion products. The main elements in the region are Al,C,O,Fe and Zn,Fe in the form of severe local corrosion of galvanized layer on the surface of Fe2O3; steel core, and the main elements are Zn,Al,C and the corrosion product of Zn,Al,C is Zn O with hexagonal wurtzite structure. Conclusion the internal AC corrosion is caused by the infiltration of liquid and the decomposition of materials caused by large amount of heat caused by corrosion.
【作者单位】： 合肥工业大学材料科学与工程学院;国网安徽省电力公司电力科学研究院;
【分类号】：TM75;TG172
本文编号：2268421
[Abstract]:Aim to study the internal AC corrosion resistance of tension clamp in old high voltage transmission line. Methods the tensile clamp which had been running for 35 years was intercepted and dissected. The microstructure of the corrosion zone was analyzed by scanning electron microscope (SEM). The elements and phases of the corrosion zone were analyzed and identified by X-ray diffractometer, energy spectrometer and X-ray photoelectron spectrometer. The evolution process of corrosion damage inside the clamp is analyzed. Results A large number of white corrosion products and black coverings were found on the inner surface of the wire clip and the surface of the aluminum wire, and the white corrosion materials were in the form of powder and lamellar. The results show that the phase composition of the corrosion products is Al2O3,Al O (OH) and Al OOH; black coverings decrease with the increase of depth, the main elements in the black area are Al,O and C, and the phase compositions are Al2O3,C (graphite) and C-containing organic compounds. The inner layer aluminum wire in the damage zone of steel core zinc layer is more susceptible to corrosion, and the corrosion zone is gray-black, and the microcosmic appearance is iron rich element particles embedded in other corrosion products. The main elements in the region are Al,C,O,Fe and Zn,Fe in the form of severe local corrosion of galvanized layer on the surface of Fe2O3; steel core, and the main elements are Zn,Al,C and the corrosion product of Zn,Al,C is Zn O with hexagonal wurtzite structure. Conclusion the internal AC corrosion is caused by the infiltration of liquid and the decomposition of materials caused by large amount of heat caused by corrosion.
【作者单位】： 合肥工业大学材料科学与工程学院;国网安徽省电力公司电力科学研究院;
【分类号】：TM75;TG172
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