输电杆塔材料在模拟工业环境中的大气腐蚀行为研究

Investigation on Atmospheric Corrosion Behavior of Transmission Tower Materials in Simulated Industrial Environments

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 atmosphere corrosion behaviour of transmission tower materials including Q235,Q345 and galvanized steel in simulated industrial environments of spraying NaHSO3 solutions was investigated by means of mass loss method,XRD analysis and SEM observation.The results indicated that the corrosion degree of Q235 and Q345 was not significantly increased with the increase of NaHSO3 concentration of the simulated solution below 0.005 mol/L,and that the above two steels presented a trend of accelerated corrosion with the increase of NaHSO3 concentration in the range between 0.005 and 0.02 mol/L,and that the corrosion degree of Q235 and Q345 had not obvious changes with the increase of NaHSO3 concentration in the range between 0.02 and 0.03 mol/L.The results of XRD analysis and SEM observation further suggested that the above corrosion phenomena of Q235 and Q345 steel are strongly related to the fact whether the conversion of corrosion product γ-Fe OOH to α-Fe OOH did occur or not for the media with the amount of NaHSO3 in every individual concentration range.In addition,the corrosion products on galvanized steel mainly consisted of ZnO,Zn4CO3（OH）6,Zn5（CO3）2（OH）6 and Zn4SO4（OH）6 despite different concentration of spraying solutions.