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中文摘要：
采用弱极化和电化学阻抗谱（EIS）方法、宏观观察、SEM观察、能谱（EDS）分析及失重法研究了X70管线钢在大庆两种土壤中的腐蚀行为。结果表明，X70钢在大庆粉沙土中主要发生全面腐蚀，在粘土中则以局部腐蚀为主；X70钢试样表面所形成的腐蚀产物膜不致密，不能对基体起到良好的保护作用；随着埋样时间增加，X70钢在两种土壤中腐蚀速率呈现下降的趋势，在粘土中的腐蚀速率远大于在粉沙土中的腐蚀速率。
英文摘要：
The corrosion behavior of X70 steel in Daqing soils was studied by means of weak polarization curve technique, EIS, macroscopic observations, SEM, EDS and weight-loss method. The results revealed that localized corrosion on the X70 steel surface mainly occurred in clay, while general corrosion mainly occurred in silt. The corrosion products were primarily iron oxide which can not protect the substrate of X70 steel because of its loose structure. The corrosion rate of the steel decreased with the increasing corrosion time, and the corrosion rate in clay was much greater than that in silt.
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