目的：研究高压输电耐张线夹用铝在0.1 mol/L的中性Na2 SO4溶液中的交流腐蚀行为。方法在耐张线夹端部截取块状腐蚀试样并包覆、打磨、清洗,利用自制设备测量试样在交变电流腐蚀作用下的Tafel曲线、交流阻抗谱和腐蚀速率,采用扫描电子显微镜分析微观腐蚀形貌,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。结果交变电流密度为0~40 A/m2时,Tafel曲线负向移动；50 A/m2时,发生逆转,曲线正向移动；随交变电流密度增加,交流阻抗谱Nyquist图由单弧逐渐变为双弧,出现Warburg阻抗,Bode-Phaze 图由单峰逐渐变为双峰；表面出现较多的点蚀坑和层状脱落痕迹；腐蚀产物为Al( OH)3和Al2 O3。结论交变电流作用下试样的腐蚀倾向加深,腐蚀表面具有较多的空洞,垂直腐蚀和平行腐蚀交替进行,呈现层状脱落方式向基体演进,腐蚀产物与一般铝腐蚀产物相同,均为Al(OH)3和Al2O3,腐蚀速率在交变电流密度低于50 A/m2时相对较低,高于50 A/m2时大幅提高。
ABSTRACT:Objective To study AC corrosion behavior of aluminum for strain clamp applied in high-voltage transmission line in 0. 1 mol/L Na2 SO4 neutral solution. Methods The block corrosion specimens were cut from the strain clamp and then coated, pol-ished and cleaned. The Tafel curve, AC impedance spectroscopy and corrosion rate of specimens under different AC density were tested by self-made devices. Scanning electron microscope( SEM) , X-Ray diffraction ( XRD) and X-ray photoelectron spectroscopy ( XPS) were used to observe and analyze the corrosion microstructure, elements distribution and corrosion products. Results The Tafel curve moved to negative direction at 0~40 A/m2 , but reversed at 50 A/m2 and moved to the positive direction. AC imped-ance spectra also changed with the increase of AC density, the Nyquist diagram gradually changed from single arc to double arc, the Warburg impedance occurred, and the Bode-Phaze diagram gradually changed from single peak to double peaks. A number of corrosion pits and the layered shedding appeared on the surface of specimens. The corrosion products were Al(OH)3 and Al2O3. Conclusion The corrosion tendency of sample was deepened under alternating current. The corrosion surface had more pits, it was alternating between vertical corrosion and parallel corrosion, the corrosion layer was continuously formed and shed. The corrosion products were similar with generally aluminum corrosion products, which were Al(OH)3 and Al2O3. The corrosion rate was rela-tively low when the AC density was less than 50 A/m2 , but it increased when the AC density was above 50 A/m2 .
参考文献
| [1] | 吴志平;胡海文;苗松;王仓.阴极保护管道交流腐蚀电化学参数解析与测试[J].油气储运,2013(12):1351-1354. |
| [2] | 唐德志;杜艳霞;路民旭;董亮;姜子涛.埋地管道交流干扰与阴极保护相互作用研究进展[J].中国腐蚀与防护学报,2013(5):351-356. |
| [3] | Min Zhu;Cuiwei Du;Xiaogang Li;Zhiyong Liu;Shengrong Wang;Jiankuan Li;Dawei Zhang.Effect of AC current density on stress corrosion cracking behavior of X80 pipeline steel in high pH carbonate/bicarbonate solution[J].Electrochimica Acta,2014:351-359. |
| [4] | Abdel-Gawad, Nagat M. K.;El Dein, Adel Z.;Magdy, Mohamed.Mitigation of induced voltages and AC corrosion effects on buried gas pipeline near to OHTL under normal and fault conditions[J].Electric Power Systems Research,2015Oct.(Oct.):297-306. |
| [5] | 王夫成;詹马骥;郎经纬;王若民;陈国宏;杜晓东.NY-400型耐张线夹内部交流腐蚀形貌及产物研究[J].表面技术,2015(9):116-121. |
| [6] | 张猛;吴雪峰;王建西.GIS铝合金材质壳体交流感应电化学腐蚀现象研究[J].高压电器,2014(9):1-5,11. |
| [7] | 王宪;罗向军;任碧野;吕根品.超级电容器集流体用铝箔交流腐蚀研究[J].广东化工,2013(21):52-54. |
| [8] | 张艾艾;何晶靖;刘天娇;张卫方.5A06铝镁合金海水腐蚀电化学特性[J].航空学报,2015(9):3147-3154. |
| [9] | 沈长斌;赵亚东;刘书华;葛继平;黄振晖;董春林.铝合金5083-6082搅拌摩擦焊焊缝的电化学腐蚀行为[J].航空材料学报,2009(5):24-28. |
| [10] | Wang, L. W.;Wang, X. H.;Cui, Z. Y.;Liu, Z. Y.;Du, C. W.;Li, X. G..Effect of alternating voltage on corrosion of X80 and X100 steels in a chloride containing solution - Investigated by AC voltammetry technique[J].Corrosion Science: The Journal on Environmental Degradation of Materials and its Control,2014Sep.(Sep.):213-222. |
| [11] | Li, H. Y.;Kang, W.;Lu, X. C..Effect of age-forming on microstructure, mechanical and corrosion properties of a novel Al-Li alloy[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2015:210-218. |
| [12] | 班朝磊;何业东;邵鑫;杜鹃;王利平.铝箔表面化学镀锌对其在HCl-H 2 SO 4体系中电蚀性能的影响[J].中国有色金属学报（英文版）,2013(12):3650-3657. |
| [13] | M. C. Li;Y. F. Cheng.Mechanistic investigation of hydrogen-enhanced anodic dissolution of X-70 pipe steel and its implication on near-neutral pH SCC of pipelines[J].Electrochimica Acta,200728(28):8111-8117. |
| [14] | 肖占文;杨邦朝;王豪才;陈银富;袁德明.阴极析氢对铝箔交流腐蚀特性的影响[J].电子元件与材料,1999(4):1-3. |
| [15] | 岳增武;李辛庚;闫风洁;郭凯.沿海地区架空钢芯铝绞线的腐蚀[J].电线电缆,2015(1):36-38,43. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%