李伟光,肖盼,刘溢,楚鹰军,左琼华,潘吉林.Q235钢在某地区土壤环境中的长期腐蚀行为[J].表面技术,2024,53(18):67-77.
LI Weiguang,XIAO Pan,LIU Yi,CHU Yingjun,ZUO Qionghua,PAN Jilin.Long-term Corrosion Behavior of Q235 Steel in Some Soil Environment[J].Surface Technology,2024,53(18):67-77 |
| Q235钢在某地区土壤环境中的长期腐蚀行为 |
| Long-term Corrosion Behavior of Q235 Steel in Some Soil Environment |
| 投稿时间：2015-03-21 修订日期：2015-04-15 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.18.005 |
| 中文关键词: Q235钢 腐蚀观测 腐蚀失重 SEM XRD 电化学测试 |
| 英文关键词:Q235 steel corrosion observation corrosion weightlessness SEM XRD electrochemical testing |
| 基金项目:科技基础资源调查专项(2021FY100603) |
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| Author | Institution |
| LI Weiguang | The Fifth Research Institute of Telecommunications Technology Co., Ltd., Chengdu 610062, China |
| XIAO Pan | The Fifth Research Institute of Telecommunications Technology Co., Ltd., Chengdu 610062, China |
| LIU Yi | The Fifth Research Institute of Telecommunications Technology Co., Ltd., Chengdu 610062, China |
| CHU Yingjun | The Fifth Research Institute of Telecommunications Technology Co., Ltd., Chengdu 610062, China |
| ZUO Qionghua | Chengdu Tairui Telecommunication Equipment Test Co., Ltd., Chengdu 610100, China |
| PAN Jilin | The Fifth Research Institute of Telecommunications Technology Co., Ltd., Chengdu 610062, China;Sichuan Chengdu Soil Environmental Material Corrosion National Observation and Research Station, Chengdu 610062, China |
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| 中文摘要: |
| 目的 为了获得Q235钢长期土壤腐蚀数据，在某地区开展土壤埋藏试验，用于积累Q235钢长周期腐蚀数据，为实际埋地相关工程提供数据服务，为相关标准制定提供数据支持。方法 采用腐蚀失重测量、宏观形貌观察、SEM、EDS、XRD、电化学测试等分析手段对某地区埋藏30年的Q235钢的腐蚀行为进行分析。结果 Q235钢板表面腐蚀形式为均匀腐蚀、缝隙腐蚀和点蚀;平均腐蚀失重速率为1.765 8 g/(dm2.a)，平均腐蚀深度速率为0.0226 mm/a，最大点蚀深度为1.59 mm;腐蚀产物EDS分析结果为Fe、O、C 3种元素，XRD分析结果表明，主要物相为FeO、Fe2O3、α-FeOOH、FeCO3、γ-FeOOH及底层量未转化的δ-FeOOH，腐蚀产物层结构不完整，内部有较多的缺陷和裂纹;电化学测试的带锈样腐蚀速率明显低于除锈后试样的腐蚀速率，说明腐蚀产物对金属基体有一定的保护作用。结论 在埋地Q235钢板的腐蚀过程中，缝隙腐蚀和点蚀占有较大比例，对腐蚀失重速率贡献明显;开展某地区土壤环境中地下工程完整性评估和环境适应性评估时，可参照本文腐蚀数据进行。 |
| 英文摘要: |
| The continuous positioning observation and experimental research can obtain the long-term scientific data of material corrosion in the local natural environment, which is valuable and necessary to decide the ways how the materials should be protected from the corrosion factors from the environment. According to incomplete statistics, the material corrosion data in the soil environment are mostly short-term ones, less of which covers a time span more than 10 years, and the corrosion data of 30 years can’t be found in any public reporting. The long-term corrosion data in the soil environment are more valuable and instructive for the construction and maintenance of an underground engineering. In this paper, a long-term corrosion experimental research of Q235 steel buried in a soil environment for 30 years was conducted, and the corrosion data were accumulated. The corrosion test was carried out according to the "Material Soil environment Corrosion Test Method" (published by the National Soil Corrosion Test Organization, China ). The mass loss after burial was measured by Corrosion Weight Loss Method, the macroscopic morphology and microstructure of corrosion products at different depths were respectively analyzed by Optical Microscope and SEM, and the phase composition of corrosion products at different depths was analyzed by XRD, which was used for corrosion mechanism analysis. The electrochemical test was carried out to analyze the corrosion behavior of Q235 steel buried for 30 years, which was used to reveal the corrosion effect of corrosion products on a metal base. The results of macroscopic observation and SEM analysis showed that the surface corrosion forms of Q235 steel were uniform corrosion, crevice corrosion and pitting corrosion after 30 years of burial. In the process of soil environment corrosion, crevice corrosion and pitting corrosion accounted for a large proportion, which contributed significantly to the weight loss rate of corrosion. The structure of corrosion product layer was not complete, and there were many defects and cracks in the interior. The results of corrosion weight loss test showed that the average corrosion weight loss rate was 1.765 8 g/(dm2.a) and the average corrosion rate in depth was 0.022 6 mm/a, the maximum pitting depth was 1.59 mm, and the pitting factor was 2.66. The elemental composition of corrosion products were Fe, O and C according to the testing results of EDS. The XRD analysis showed that the main phases were FeO, Fe2O3, α-FeOOH, FeCO3, γ-FeOOH and a small amount of unconverted δ-FeOOH in the bottom layer of corrosion product. The corrosion rate of the rusted sample in the electrochemical test was significantly lower than that of the sample after rust removal, indicating that the corrosion products had a certain protective effect on the metal matrix. After 30 years of burial test and analysis, the long-term soil environment corrosion data of Q235 steel were systematically obtained. These corrosion data could provide a basic information support not only for the research on corrosion mechanism of carbon steel, but also for the material selection and design as well as the service life evaluation of engineering equipment equipped in an underground engineering. For example, the maximum pitting depth of 1.59 mm means that, a non-pressure- bearing structures made by bare Q235 steel could have a service life of more than 30 years when there is a surplus of 2 mm in design thickness. |
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