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采用扫描电镜(SEM)、能谱(EDS)和X射线衍射(XRD)等技术对红壤中变电站接地网服役长达13 a的镀锌扁钢进行了形貌分析和腐蚀产物分析。结果表明,该镀锌扁钢受到严重腐蚀,腐蚀产物主要由Fe OOH,Fe3O4和Fe2O3等组成,腐蚀产物分层的原因是新生成的腐蚀产物沉积在金属/腐蚀产物层界面或腐蚀产物开裂处,同时S和Cl对内层腐蚀产物具有较大的影响。Tafel测试结果表明,在腐蚀电流峰值附近,SO42-与Cl-的百分比为1∶2时,两者对镀锌Q235碳钢在该红壤中的腐蚀性影响具有等效作用。通过室内加速实验模拟镀锌Q235碳钢在该红壤中的腐蚀发现,镀锌Q235碳钢的腐蚀速率呈现先增大后减小的规律,该加速实验在未改变镀锌Q235碳钢腐蚀机理的同时具有较好的加速效果。
The morphology and corrosion products of galvanized flat steel for 13 days in substation grounding network in red soil were analyzed by SEM, EDS and XRD. The results show that the flat galvanized steel is severely corroded, and the corrosion products mainly consist of FeOOH, Fe3O4 and Fe2O3. The reason for the delamination of the corrosion products is that the newly formed corrosion products are deposited on the interface of the metal / corrosion product layer or the cracks of the corrosion products , While S and Cl have a greater impact on the inner corrosion products. The results of Tafel test showed that the corrosive effect of galvanized Q235 carbon steel in this red soil was equivalent when the ratio of SO42- and Cl- was 1: 2 near the peak of corrosion current. The indoor accelerated experiment simulated the corrosion of galvanized Q235 carbon steel in this red soil and found that the corrosion rate of galvanized Q235 carbon steel first increased and then decreased. The accelerated experiment did not change the corrosion mechanism of galvanized Q235 carbon steel At the same time have a good acceleration.