热处理工艺对17-4PH不锈钢氧化皮结构及其腐蚀行为的影响
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摘要
通过控制氧化温度、保温时间在17-4PH不锈钢表面制备不同结构的氧化皮。利用扫描电镜(SEM)、X射线衍射仪(XRD)和电化学测试方法研究了不同工艺下所制备的17-4PH不锈钢表面氧化皮的结构及其在3.5 wt%NaCl溶液中的腐蚀行为。结果表明:氧化温度的升高使得17-4PH不锈钢氧化皮的微观结构由伴有沟壑的棉絮状转变为片状的带毛刺的小颗粒,而保温时间的延长有助于片状小颗粒之间的缺陷减少。氧化皮主要由Fe_3O_4和Fe_2O_3组成。随着氧化温度的升高或保温时间的延长,Fe_2O_3的相对含量上升,氧化皮的致密性和连续性有所增加,从而有助于改善氧化皮的耐蚀性。550℃保温12 h的工艺所制备的17-4PH不锈钢氧化皮具有较好的耐蚀性。
Oxide scales with different structures were prepared on the surface of 17-4PH stainless steel by controlling the oxidation temperature and holding time.The scanning electron microscopy(SEM),X-ray diffraction(XRD)and electrochemical test methods were used to investigate the structure of oxidized surface and corrosion behavior in 3.5wt%NaCl solution.The results show that with the increase of the oxidation temperature,the structure of oxide scales changes from cotton-like with gully to flake-like small particles with burrs,and the prolonging of holding time is helpful to the reduction of defects between small particles.The oxide scale of 17-4PH stainless steel mainly consists of Fe_3O_4and Fe_2O_3phases.The relative content of Fe_2O_3increases with the increase of the oxidation temperature and holding time.The increase of the oxidation temperature and the prolonging of the holding time contribute to the increase of the compactness and continuity of the oxide scale,thereby improving the corrosion resistance of the oxide scale.The oxide scale of 17-4PH stainless steel prepared by the process of heat preservation at 550℃for 12 h has better corrosion resistance.
Oxide scales with different structures were prepared on the surface of 17-4PH stainless steel by controlling the oxidation temperature and holding time.The scanning electron microscopy(SEM),X-ray diffraction(XRD)and electrochemical test methods were used to investigate the structure of oxidized surface and corrosion behavior in 3.5wt%NaCl solution.The results show that with the increase of the oxidation temperature,the structure of oxide scales changes from cotton-like with gully to flake-like small particles with burrs,and the prolonging of holding time is helpful to the reduction of defects between small particles.The oxide scale of 17-4PH stainless steel mainly consists of Fe_3O_4and Fe_2O_3phases.The relative content of Fe_2O_3increases with the increase of the oxidation temperature and holding time.The increase of the oxidation temperature and the prolonging of the holding time contribute to the increase of the compactness and continuity of the oxide scale,thereby improving the corrosion resistance of the oxide scale.The oxide scale of 17-4PH stainless steel prepared by the process of heat preservation at 550℃for 12 h has better corrosion resistance.
引文
[1]邓德伟,陈蕊,田鑫,等.热处理对17-4PH马氏体不锈钢显微组织及性能的影响[J].金属热处理,2013(4):32-36.
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[10]周贤良,周伟,华小珍等.加热气氛中氧浓度对热轧带钢氧化皮结构及耐蚀性的影响[J].材料热处理学报,2010,31(7):134-139
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[12]叶志国,朱敏,周贤良等.热处理温度对510L热轧带钢原始氧化皮结构及其腐蚀行为的影响[J].材料工程,2011(5):53-61.
[13]韩军科,严红,黄耀等.耐候钢表面氧化皮的结构特征及其对大气腐蚀行为的影响[J].金属学报,2017,53(2):163-174.
[14] Lucía Suárez, Yvan Houbaert, Xavier Vanden Eynde, et al.High temperature deformation of oxide scale[J]. Corrosion Science,2008,51(2):309-315.
[2]胡隆伟,叶文君,紧固件材料手册[D].北京:中国宇航出版社,2014.
[3] Feng X, Lu X, Zuo Y, et al. The passive behaviour of 304stainless steels in saturated calcium hydroxide solution under different deformation[J]. Corrosion Science,2013,301(1/2):449-456.
[4] Wang J, Zou H, Li C, et al. The effect of microstructural evolution on hardening behaviour of type 17-4PH stainless steel in long-term aging at 350℃[J]. Materials Characterization,2006(4/5):274-280.
[5] Sun W H, Tieu A K, Jiang Z Y, et al. Surface characteristics of oxide scale in hot strip rolling[J]. J. Mater. Process.Technol.,2003,140:76-83.
[6] Sun W H, Tieu A K, Jiang Z Y, et al. Oxide scales growth of low-carbon steel at high temperatures[J]. J. Mater. Process.Technol.,2004,155-156:1300-1306.
[7] Sun W H, Tieu A K, Jiang Z Y, et al. High temperature oxide scale characteristics of low carbon steel in hot rolling[J]. J. Mater. Process. Technol.,2004,155-156:1307-1312.
[8] Jiang Z Y, Tieu A K, Sun W H, et al. Characterisation of thin oxide scale and its surface roughness in hot metal rolling[J]. Mater. Sci.Eng A,2006,435/436:434-438.
[9] Dong C F, Xue H B, Li X G, et al. Electrochemical corrosion behavior of hot-rolled steel under oxide scale in chloride solution[J]. Electrochim Acta,2009,54:4223-4228.
[10]周贤良,周伟,华小珍等.加热气氛中氧浓度对热轧带钢氧化皮结构及耐蚀性的影响[J].材料热处理学报,2010,31(7):134-139
[11]周贤良,朱敏,华小珍等.不同冷却方式对热轧带钢氧化皮结构及其耐蚀性的影响[J].中国腐蚀与防护学报,2010,30(4):323-328.
[12]叶志国,朱敏,周贤良等.热处理温度对510L热轧带钢原始氧化皮结构及其腐蚀行为的影响[J].材料工程,2011(5):53-61.
[13]韩军科,严红,黄耀等.耐候钢表面氧化皮的结构特征及其对大气腐蚀行为的影响[J].金属学报,2017,53(2):163-174.
[14] Lucía Suárez, Yvan Houbaert, Xavier Vanden Eynde, et al.High temperature deformation of oxide scale[J]. Corrosion Science,2008,51(2):309-315.