碳钢在达州典型大气环境下的腐蚀行为研究

Study on Corrosion Behavior of Carbon Steel in Typical Atmospheric Environments in Dazhou

摘要:

通过1年期现场暴露试验、腐蚀速率分析、锈层形貌观察、锈层组成分析及电化学测试等试验方法，研究了Q235碳钢在达州典型大气环境下的腐蚀行为。结果表明，位于工业大气环境的达州市通川区，Q235碳钢的腐蚀速率为23.78 μm/a，而位于乡村大气环境的达州市万源市，Q235碳钢的腐蚀速率仅为10.33 μm/a。Q235碳钢表面腐蚀产物主要组成为γ-FeOOH、α-FeOOH和Fe3O4。电化学结果表明，在达州重工业环境下的碳钢腐蚀较为严重，腐蚀产物层电阻和电荷转移电阻均高于达州乡村环境，说明其表面锈层能有效保护基体，减缓基体的进一步腐蚀。

Abstract:

The corrosion behavior of Q235 carbon steel in typical atmospheric environments in Dazhou is studied by 1-year outdoor exposure test, corrosion rate analysis, rust layer morphology observation, rust layer composition analysis and electroche mical test. The results show that the corrosion rate of Q235 carbon steel is 23.78 μm/a in Tongchuan district of Dazhou, which is located in industrial atmosphere, while the corrosion rate of Q235 carbon steel is only 10.33 μm/a in Wanyuan of Dazhou, which is located in rural atmosphere. The surface corrosion products are mainly composed of γ-FeOOH, α-FeOOH and Fe3O4. The electrochemical results show that the corrosion of carbon steel in heavy industrial environment of Dazhou is more serious, and its resistance of corrosion product scale and charge transfer resistance are higher than that in rural environment of Dazhou, which indicates that the surface rust layer could effectively protect the substrate and slow down further corrosion of the substrate.