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对比分析了Q235钢在实际土壤和模拟溶液中的腐蚀行为,计算了其腐蚀失重,利用SEM和XRD方法分析了两种腐蚀介质中Q235钢的锈层形貌、物相结构及相对含量,并分析了不同介质中材料的极化曲线。结果表明:Q235钢在两种不同腐蚀介质中的腐蚀行为存在较大差异。Q235钢在模拟溶液中的腐蚀速率远高于实际土壤,至周期360h达到0.413mm/a,约为实际土壤的4.5倍;Q235钢在实际土壤中呈蚀斑相连长大扩展的腐蚀形貌,其腐蚀产物为α-FeOOH、γ-FeOOH、Fe3O4和Fe2O3;模拟溶液中试样为均匀腐蚀形貌,阴极过程主要受析氢控制;随腐蚀周期的延长,内锈层中生成结晶性良好的Fe3O4,降低了试样的腐蚀速率。
The corrosion behavior of Q235 steel in actual soil and simulated solution was analyzed and compared. The corrosion loss of Q235 steel was calculated. The corrosion morphology, phase structure and relative content of Q235 steel in two corrosive media were analyzed by SEM and XRD. The polarization curves of materials in different media were analyzed. The results show that the corrosion behavior of Q235 steel in two different corrosive media is quite different. The corrosion rate of Q235 steel in the simulated solution was much higher than that of the actual soil until the period of 360h reached 0.413mm / a, which was about 4.5 times that of the actual soil. The corrosion morphology of Q235 steel, The corrosion products were α-FeOOH, γ-FeOOH, Fe3O4 and Fe2O3. The samples in the simulated solution were of uniform corrosion morphology. The cathodic process was mainly controlled by hydrogen evolution. With the prolongation of the corrosion cycle, the well-crystallized Fe3O4 , Reducing the corrosion rate of the sample.