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| Analysis of Corrosion Factors of Steel Structure in a Southeast Coastal Power Plant |
| Received:October 24, 2023 Revised:November 14, 2023 |
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| DOI：10.7643/issn.1672-9242.2024.01.011 |
| KeyWord:corrosion environment steel structure grid electrochemistry corrosion soluble salt of steel structure surface dust marine environment |
| Author | Institution |
| ZHENG Guo |
Zhanjiang Power Co., Ltd., Guangdong Zhanjiang , China |
| WU Guowei |
Zhanjiang Power Co., Ltd., Guangdong Zhanjiang , China |
| ZHENG Guanwen |
Zhanjiang Power Co., Ltd., Guangdong Zhanjiang , China |
| DENG Peichang |
College of Chemistry and Environment, Guangdong Ocean University, Guangdong Zhanjiang , China |
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| Abstract: |
| The work aims to compare the distribution of corrosion environmental factors and the distribution of steel structure corrosion events, analyze the main environmental factors affecting the corrosion of steel structure in thermal power plants, and explore the corrosion mechanism of steel structure in thermal power plants. Taking a southeast coastal power plant as an example, the plant area was gridded. The portable temperature and humidity meter was used to monitor the temperature and humidity grid by grid, and the dust on the surface of the structure was collected grid by grid, and the contents of chloride ions, soluble salts, acid and alkali were analyzed, so as to monitor the corrosion environment. The corrosion protection projects in each grid of the power plant during the decade from 2012 to 2022 were counted, such as the number of construction or application of corrosion protection devices, equipment and materials. The factors such as temperature, humidity, chloride ion content, soluble salt content and dust-soaking liquid pH on the surface of steel structures were affected by multiple factors such as marine environment, factory structure distribution and production activities, and they were distributed in strips with the increase of distance from the sea or radiated around production facilities. The order of effect of environmental factors on corrosion of steel structure:soluble salt of SSSD>soluble salt of SSSD>dust-soaking liquid pH of SSSD>humidity>chloride content of SSSD>temperature. The corrosion mechanism of the steel structure in the power plant is the salt of SSSD dissolved in the rain or atmospheric condensate water, and the saline water is admitted to the surface of steel structure through the coating faults and becomes the ion conduction path of primary cells for steel corrosion and then the electrochemistry corrosion of steel is triggered or exacerbated. |
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