热处理温度对510L钢氧化皮结构及耐蚀性的影响

Influence of heat treatment temperature on structure and corrosion resistance of oxide scales formed on hot-rolled steel 510L

采用不同的热处理温度,在510L钢表面制备氧化皮。通过扫描电子显微镜(SEM)观察氧化皮的截面形貌,用X射线衍射仪(XRD)、透射电子显微镜(TEM)测定其结构;并采用干湿周期浸润实验、扫描Kelvin探针和交流阻抗谱研究不同结构的氧化皮热轧带钢在0.01 mol/L NaHSO3溶液的耐蚀行为。结果表明:随温度的升高,氧化皮厚度增加和微观孔隙增多;在保证氧化皮连续、氧化皮/基体结合良好的情况下,氧化皮厚度对氧化皮耐蚀性能起到较大作用;不同温度下生成的热轧带钢氧化皮的耐蚀性能由好到差依次为:580、560、550和500℃。

Oxide scales on 510L steel were fabricated under different heat treatment temperatures.Section morphology of the various scales on the steel was observed by scanning electron microscopy（SEM） and the structure of the oxide scales was determined by X-ray diffraction（XRD） and transmission electron microscope（TEM）.Corrosion behavior of the various scales in 0.01 mol/L NaHSO3 solution was investigated by cyclic wet-dry immersion test,scanning Kelvin probe（SKP） and electrochemical impedance spectroscopy（EIS）.The results show that thickness of the oxide scales and micro holes increase with increasing temperature.The thickness of the oxide scale plays a greater role in corrosion resistance in the case of keeping oxide scale continuous and good binding between the oxide scale and substrate.The better corrosion resistance of the oxide scale formed at 580 ℃ is observed and the oxide scales formed at lower temperatures present worse corrosion performance.