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| Investigation of Corrosion Behaviors of Different Alloy Coatings in the Soil of Transformer Substation |
| Received:June 11, 2015 Revised:August 15, 2015 |
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| DOI：10.7643/issn.1672-9242.2015.04.011 |
| KeyWord:alloy coating soil corrosion electrochemical corrosion high-speed arc spraying |
| Author | Institution |
| XU Song |
State Grid Hunan Electric Power Corporation Research Institute， Changsha ， China |
| FENG Bing |
State Grid Hunan Electric Power Corporation Research Institute， Changsha ， China |
| HE Tie-xiang |
State Grid Hunan Electric Power Corporation Research Institute， Changsha ， China |
| HU Bo-tao |
State Grid Hunan Electric Power Corporation Research Institute， Changsha ， China |
| WU Xin-qiang |
Institute of Metal Research， Chinese Academy of Sciences， Shenyang ， China |
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| 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 the underground, 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. |
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