摘要
通过控制氮、氧混合气体中的氧含量,650℃保温30 min,在武钢510 L热轧带钢表面制备氧化皮。采用SEM、XRD、电化学测试方法研究了不同结构氧化皮的热轧带钢在3.5 wt%NaCl溶液中的腐蚀行为。结果表明,氧浓度5%时,所制备的氧化皮没有分层,只含有Fe3O4和Fe颗粒,厚度仅为6μm左右;氧浓度在10%～60%时,所制备的氧化皮结构均为表层Fe2O3较薄,中间层Fe3O4最厚,内层Fe3O4和Fe混合相。氧浓度10%时,其氧化皮厚度约15μm,表层Fe2O3量较少,与Fe3O4层界限模糊;当氧浓度>10%时,其氧化皮厚度均为20μm左右,与氧浓度10%相比,表层Fe2O3量略有增加,Fe2O3层与Fe3O4层界限分明;不同供氧条件下制备的热轧带钢氧化皮的耐蚀性能由好到差依次为:20%、10%、30%、60%、5%。
Oxide scales on a low carbon hot rolled steel strip were formed in atmosphere with different concentration of oxygen at 650 ℃ for 30 min.The corrosion behavior of the hot rolled steel strip with various scales was investigated by means of SEM,XRD,polarization curves and electrochemical impedance spectroscopy（EIS） in 3.5 wt% NaCl solution.When the oxygen concentration equaled 5%,the oxide scale consisted of Fe3 O4 and Fe particles,and its thickness was only about 6 μm.When the oxygen concentration was higher than or equal to 10%,the scale was composed of the outer layer of Fe2 O3,the intermediate layer of Fe3 O4,and the inner layer of Fe3 O4 and Fe particles.The scale thickness formed in the atmosphere with oxygen content of 10% was about 15 μm,and the amount of Fe2 O3 in the scale was fewer than that in the other scales.When the oxygen concentration was higher than 10%,the scale thickness was about 20 μm,and the amount of Fe2 O3 in the scale slightly increased compared with that of the scale formed under the oxygen content of 10%.The order of corrosion resistance of the scales under various oxygen contents from good to poor is as follows： 20%,10%,30%,60%,5%.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2010年第7期134-139,共6页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(50871051)
教育部无损检测重点实验室基金(ZD200729003)
江西省教育厅重点实验室基金(GJJ2005-316)
江西省教育厅基金(GJJ08519)
关键词
热轧带钢
氧浓度
氧化皮
耐蚀性
hot rolled steel
oxygen concentration
oxide scale
corrosion resistance
