中文摘要：

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,Fe3O4,Fe2O3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。

英文摘要：

The corrosion behavior of two low alloy steels, as candidate materials for grounding net,was investigated by indoor corrosion test in a simulated acid soil by means of mass loss method,scanning electron microscopy, electrochemical measurement and Raman spectra. The results showed that the corrosion rate of the two steels went up in the initial stage and then slow down; the corrosion mass loss of Q235 steel was larger than that of A steel; and correspondingly they suffered from local corrosion and then turned to general corrosion. The two steels formed bi-layered corrosion products, of which the outer portions all consisted of α-Fe OOH, Fe3O4, Fe2O3 and γ-Fe OOH,how ever the inner portions were large different, the concentration of α-Fe OOH in the inner protective layer of the A steel was higher than that of the Q235 steel. Tafel polarization curves indicated that the A steel possessed much positive corrosion potential with smaller corrosion current density in contrast with the Q235 steel.