几种合金涂层在变电站土壤中的腐蚀行为研究

摘要

ABSTRACT:Objective To investigate the corrosion behaviors of four alloy coatings (Al, AlSi, NiAl, 316L) samples in the soil and soil solution of transformer substation. Methods Pure Al coating, AlSi alloy coating, NiAl alloy coating and 316L stainless steel coating were prepared on the surface of Q235 steel by high-speed arc spraying technology. The corrosion resistance of the four sprayed alloy coatings in the soil and soil solution of the Maojiatang 220kV transformer substation in Hunan was studied by buried specimens and electrochemical test. The corrosion products of the buried specimens were observed and analyzed by scanning electron microscopy(SEM)and electron diffraction spectra (EDS). Results The results showed that AlSi coating had the best corrosion resistance among the four sprayed alloy coatings, followed by NiA1 and stainless steel coating,and the Al coating was easily bouffant after buried for a long time in theunderground, so that the corrosion resistance was not good. Conclusion The corrosion resistance of steel Q235 was significantly improved by the four sprayed alloy coatings, and the coated steel could be applied in protection of grounding grid materials.%目的：研究Al，AlSi，NiAl，316L不锈钢四种合金涂层在变电站土壤及其溶液中的腐蚀行为。方法采用高速电弧喷涂方法在Q235钢表面上分别制备纯Al，AlSi，NiAl，316L不锈钢合金涂层，通过对四种涂层钢在湖南220 kV毛家塘变电站中进行埋样和土壤溶液里的电化学实验，研究四种涂层在变电站土壤及其溶液中的耐蚀性能，并利用扫描电子显微镜（SEM）和X射线电子能谱（EDS）对埋样的腐蚀产物进行观察和分析。结果 AlSi涂层具有最好的耐土壤腐蚀性，其次是NiAl涂层和316L不锈钢涂层，而纯铝涂层长时间埋地容易鼓泡，耐土壤腐蚀性不佳。结论四种合金涂层显著提高了Q235钢的耐蚀性，可用于接地网材料防腐。