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| Atmospheric Corrosion of Steels Commonly-used in Power Grid Equipment in Anhui Province |
| Received:December 30, 2019 Revised:January 15, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2020.07.018 |
| KeyWord:grid equipment steel atmospheric corrosion corrosion rate corrosion product microstructure corrosion mechanism |
| Author | Institution |
| ZHANG Jie |
Electric Power Research Institute, Anhui Electric Power Co.Ltd, State Grid, Hefei , China |
| ZHANG Jian |
Anhui Xinli Electric Technology Consulting Co.Ltd, Hefei , China |
| CHEN Guo-hong |
Electric Power Research Institute, Anhui Electric Power Co.Ltd, State Grid, Hefei , China |
| WEI Xin |
School of Materials Science and Engineering, Hefei University of Technology, Hefei , China |
| LI Chen-yu |
School of Materials Science and Engineering, Hefei University of Technology, Hefei , China |
| TANG Wen-ming |
School of Materials Science and Engineering, Hefei University of Technology, Hefei , China |
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| Abstract: |
| The paper aims to study the corrosion rates, corrosion products and morphologies ofthe corrosion layers Q235, 40Cr and the galvanized steel exposed for 1 year in three sites of H1, R1 and T28 of Anhui province and discuss the atmospheric corrosion mechanism. The weighing method was used to test the weight loss of the steel samples. Optical and electronic scanning microscopes were used to observe the planar and cross-sectional views of the corrosion layers. An energy disperse spectroscopy and an X-ray diffractometer were employed to test the micro-zone compositions and the phases composition of the corrosion layers, respectively. The atmospheric corrosion products of the Q235 and 40Cr were FeOOH, Fe3O4, Fe (OH)3 and FeSO4, and those of the galvanized steel were ZnO and ZnSO4. Wool ball-like α-FeOOH and flake-like γ-FeOOH can be observed on the surfaces of the corrosion layers of Q235 and 40Cr. The corrosion layer of the galvanized steel was dense; however, etch pits existed on the corrosion layer of the galvanized steel at site T28, which degraded the corrosion protection ability of the corrosion layer. The sequence of the corrosion rate of the three steels is 40Cr > Q235 > the galvanized steel. The steels at site R1 have the highest corrosion rate, and those at site T28 have the lowest corrosion rate. |
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