该【红壤土浸出液中SO 4~(2-)对铜包钢耐蚀性能的影响研究 】是由【wz_198613】上传分享，文档一共【3】页，该文档可以免费在线阅读，需要了解更多关于【红壤土浸出液中SO 4~(2-)对铜包钢耐蚀性能的影响研究 】的内容，可以使用淘豆网的站内搜索功能，选择自己适合的文档，以下文字是截取该文章内的部分文字，如需要获得完整电子版，请下载此文档到您的设备，方便您编辑和打印。红壤土浸出液中SO_4~(2-)对铜包钢耐蚀性能的影响研究 Title: Impact of SO4^2- in Red Soil Leachate on the Corrosion Resistance of Copper-Coated Steel Abstract: This research study aims to investigate the influence of SO4^2- in red soil leachate on the corrosion resistance properties of copper-coated steel. The corrosion resistance of the copper-coated steel was evaluated through electrochemical techniques, such as polarization curves and electrochemical impedance spectroscopy (EIS). The experimental results revealed that the presence of SO4^2- in the red soil leachate has a significant impact on the corrosion behavior of copper-coated steel. This research provides valuable insights for the development of protective coatings to enhance the durability and performance of copper-coated steel in red soil environments. 1. Introduction (150 words): Copper-coated steel is widely used in various industrial applications due to its excellent electrical conductivity and corrosion resistance properties. However, in certain environments, such as red soil regions, the corrosion resistance of copper-coated steel may be compromised due to the presence of aggressive ions like SO4^2-. Red soils are characterized by their high iron oxide content, low organic matter, and acidic pH, making them prone to leach out various ions into surrounding water bodies. This research seeks to understand the impact of SO4^2- ions in red soil leachate on the corrosion resistance of copper-coated steel to guide the development of efficient protective coatings. 2. Materials and Methods (200 words): Sample Preparation: Copper-coated steel samples were prepared by applying a uniform copper coating layer onto steel substrates through a well-established electroplating technique. The thickness of the copper coating was controlled at around 20 µm to ensure uniformity among samples. Experimental Setup: The electrochemical corrosion tests were conducted using a potentiostat/galvanostat setup. The samples were immersed in red soil leachate containing varying concentrations of SO4^2- ions. The electrochemical performance of the samples was evaluated using potentiodynamic polarization curves and EIS techniques. The corrosion potential (Ecorr), corrosion current density (Icorr), and polarization resistance (Rp) were measured and used as indicators to assess the corrosion behavior of the copper-coated steel samples. 3. Results and Discussion (500 words): The polarization curves obtained for copper-coated steel samples immersed in red soil leachate with different SO4^2- concentrations indicated a clear correlation between SO4^2- concentration and corrosion behavior. As the concentration of SO4^2- in the leachate increased, the corrosion current density (Icorr) increased significantly, indicating enhanced corrosion activity. The EIS results revealed a decrease in the polarization resistance (Rp) with increasing SO4^2- concentration. This decrease can be attributed to the formation of corrosion products on the surface of the copper-coated steel, leading to increased charge transfer resistance and reduced corrosion resistance. Furthermore, the presence of SO4^2- ions in the red soil leachate promoted the pitting corrosion of the copper-coated steel. Pitting corrosion appeared as localized attack sites with lower impedance values on the EIS spectra. The initiation and propagation of pit corrosion sites were observed to increase with increasing SO4^2- concentration. The mechanism behind the detrimental effect of SO4^2- on the corrosion resistance of copper-coated steel can be attributed to the formation of copper sulfate (CuSO4) compounds. These compounds are easily soluble in water and can result in the dissolution of copper ions from the protective copper coating. The dissolution of copper ions accelerates the corrosion process of the underlying steel substrate and compromises the integrity of the copper coating. 4. Conclusion (150 words): The research findings highlight the significant impact of SO4^2- on the corrosion resistance of copper-coated steel in red soil leachate. The high concentration of SO4^2- leads to increased corrosion activity, reduced polarization resistance, and enhanced pitting corrosion. These detrimental effects can be attributed to the formation of soluble copper sulfate compounds, leading to the dissolution of protective copper coating. Based on these results, it is recommended to develop protective coatings that can effectively mitigate the corrosion effects caused by SO4^2- ions. These coatings should provide enhanced barrier properties and better stability in red soil environments to ensure the long-term durability and performance of copper-coated steel. Overall, this research study contributes to a deeper understanding of the corrosion behavior of copper-coated steel in red soil environments and provides valuable insights for the development of corrosion-resistant materials and coatings for industrial applications.
