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用硅藻土模拟酸性土壤,对两种接地网材料用的实验钢进行室内加速腐蚀实验。通过实验室埋片腐蚀实验、激光拉曼光谱和电化学方法研究其在模拟酸性土壤中的耐蚀性。结果表明,两者的腐蚀速率呈现先升后降的趋势;Q235钢的腐蚀失重明显大于低合金A钢的,且两者的腐蚀速率相差近一倍,腐蚀形貌由局部腐蚀逐渐发展为全面腐蚀;腐蚀产物均出现分层结构,外锈层成分大致相同,主要为α-FeOOH,Fe_3O_4,Fe_2O_3和γ-FeOOH,内锈层成分差别较大,低合金A钢中保护性锈层α-FeOOH所占比例大。Tafel极化曲线测试表明,低合金A钢的自腐蚀电位更正,腐蚀电流密度更小。
Using diatomite to simulate acidic soil, two accelerated corrosion experiments were conducted on the experimental steel used in the grounding material. Corrosion resistance in simulated acid soils was studied by laboratory immersion etching experiments, laser Raman spectroscopy and electrochemical methods. The results show that the corrosion rate of the Q235 steel increases firstly and then decreases. The corrosion weight loss of the Q235 steel is obviously larger than that of the low alloy A steel, and the corrosion rate of the Q235 steel almost doubled. The corrosion morphology gradually developed from partial corrosion to comprehensive Corrosion; the corrosion products were stratified structure, the outer rust layer composition is roughly the same, mainly a-FeOOH, Fe 3 O 4, Fe 2 O 3 and γ-FeOOH, the composition of the larger differences in rust, rust- FeOOH a large proportion. Tafel polarization curve test shows that the low alloy A steel corrosion potential correction, corrosion current density smaller.