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研究了输电杆塔材料Q235,Q345钢以及镀锌钢在NaHSO_3溶液喷雾的模拟工业大气环境中的腐蚀行为。使用腐蚀失重法获得了3种材料的腐蚀速率。结果表明,在NaHSO_3溶液低浓度范围(≤0.005 mol/L),随浓度增加,Q235和Q345钢的腐蚀程度均较低且无明显变化;在中等浓度范围(0.005~0.02 mol/L),随浓度增加,两种材料呈加速腐蚀的趋势;在较高浓度范围(0.02~0.03 mol/L),两种材料的腐蚀程度最高,但随浓度增加并无明显改变。XRD分析和SEM观察进一步表明,以上腐蚀规律与是否发生片状γ-FeOOH向棉花状α-FeOOH转变有关。另外,在各种浓度下,镀锌钢的腐蚀产物类型无明显差异,主要由ZnO,Zn_4CO_3(OH)_6,Zn_5(CO_3)_2(OH)_6及Zn_4SO_4(OH)_6组成。
The corrosion behaviors of Q235, Q345 steel and galvanized steel in the simulated industrial atmosphere with NaHSO 3 solution spray were studied. The corrosive rates of the three materials were obtained using the corrosive weight loss method. The results showed that the corrosion rate of Q235 and Q345 steel was lower and no obvious change with the concentration increasing in the low concentration range of NaHSO 3 solution (≤0.005 mol / L). At the medium concentration range (0.005-0.02 mol / L) Both materials showed the tendency of accelerating corrosion. The corrosion of the two materials was the highest at higher concentration range (0.02 ~ 0.03 mol / L), but no obvious change with increasing concentration. XRD analysis and SEM observation further showed that the above corrosion pattern was related to the occurrence of transitional γ-FeOOH to cotton-like α-FeOOH. In addition, there was no significant difference in the types of corrosion products of galvanized steel at various concentrations, which mainly consisted of ZnO, Zn_4CO_3 (OH) _6, Zn_5 (CO_3) _2 (OH) _6 and Zn_4SO_4 (OH) _6.