氧化铁皮对低碳钢大气腐蚀行为的影响

利用干湿交替腐蚀试验模拟工业大气环境，研究了层状结构氧化铁皮对热轧低碳钢工业大气腐蚀行为的影响.采用SEM和电化学手段对比分析带氧化铁皮和不带氧化铁皮试样的腐蚀增重行为、锈层结构和电化学行为.结果表明，带氧化铁皮试样的腐蚀速度远低于无氧化铁皮覆盖的基体钢，带氧化铁皮试样的自腐蚀电位低于基体钢，单一物相层状结构的氧化铁皮具有很好的耐腐蚀性，能够有效保护基体钢板；氧化铁皮的完整性是保护带钢基体不被腐蚀的前提，如果氧化层被破坏，在破损位置处，氧化铁皮与钢基体接触发生电偶腐蚀，加速腐蚀反应的进行.

Effects of Oxide Scale on Industrial Atmosphere Corrosion of Low Carbon Steels

Effects of the layer structure oxide scale on the industrial atmosphere corrosion of hot rolled low carbon steels were investigated by wet/dry cyclic corrosion test. The corrosion weight gain， corrosion product structure and electrochemistry behavior of the specimens with the oxide scales were analyzed compared with that of the specimens without the oxide scales through scanning electron microscopy (SEM) and electrochemistry methods. It was found that the corrosion rate of the samples with oxide scale was lower than that of the naked steel. Polarization curves indicated that the samples covered with oxide scale had a lower corrosion potential than that of the naked steel. Single phase layered structure oxide scales had a good corrosion resistance that kept the substrate steel from corrosion. The integrity of oxide scale was the crucial prerequisite that the oxide scale protect the substrate steel. If the oxide scale was broken， galvanic corrosion will happen between the iron oxide and the substrate steel at the location of defects.