喷丸和盐酸酸洗对2205双相不锈钢热轧板氧化层微观结构的影响

doi:10.13251/j.issn.0254-6051.2021.02.013

金属热处理 ›› 2021, Vol. 46 ›› Issue (2): 74-80.DOI: 10.13251/j.issn.0254-6051.2021.02.013

喷丸和盐酸酸洗对2205双相不锈钢热轧板氧化层微观结构的影响

王剑¹, 孟浩杰¹, 李朋¹, 李国平², 李俊², 刘洁³, 韩培德¹

1.太原理工大学材料科学与工程学院, 山西太原 030024;
2.山西太钢不锈钢股份有限公司技术中心, 山西太原 030003;
3.太原科技大学材料科学与工程学院, 山西太原 030024

收稿日期:2020-07-20 出版日期:2021-02-25 发布日期:2021-05-08
作者简介:王剑(1986—),男,讲师,博士,主要研究方向为不锈钢材料设计及性能,E-mail:jianwang1@126.com
基金资助:
山西省科技重大专项(20181101015)

Effect of shot peening and hydrochloric acid pickling on oxide layer microstructure of 2205 duplex stainless steel hot-rolled sheet

Wang Jian¹, Meng Haojie¹, Li Peng¹, Li Guoping², Li Jun², Liu Jie³, Han Peide¹

1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan Shanxi 030024, China;
2. Technology Center, Shanxi Taiyuan Stainless Steel Co., Ltd., Taiyuan Shanxi 030003, China;
3. College of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan Shanxi 030024, China

Received:2020-07-20 Online:2021-02-25 Published:2021-05-08

摘要/Abstract

摘要： 利用光学显微镜(OM)、X射线衍射(XRD)、扫描电镜(SEM)配合能谱仪(EDS)和X射线光电子能谱(XPS)研究了 2205双相不锈钢热轧板经过退火和喷丸处理后的氧化层组成和结构,并分析了盐酸及混酸(HNO₃+HF)酸洗后表面钝化膜微观组织结构,利用电化学测试手段分析了酸洗后钢的耐蚀性,进一步提出了热轧退火2205双相不锈钢板在喷丸和酸洗过程中氧化层去除演变模型。结果表明:喷丸处理对于2205双相不锈钢表层富Fe氧化物的去除效果明显,但是不能去除内层致密的富Cr氧化层。盐酸预酸洗由外向内可以进一步去除喷丸后致密氧化层,硝酸和氢氟酸终酸洗可去除退火产生的贫Cr层,使得钢表面形成富含Cr₂O₃的钝化膜。2205双相不锈钢经混酸终酸洗后表现出比盐酸预酸洗后更高的自腐蚀电位和更大的容抗弧半径,说明混酸酸洗有利于提高2205双相不锈钢的耐蚀性能。

关键词: 2205双相不锈钢, 喷丸, 酸洗, 氧化层

Abstract: Optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and X-ray photoelectron spectroscopy (XPS) were used to study the oxide layer microstructure of the 2205 duplex stainless steel hot-rolled sheet after annealing and shot peening treatment, and to analyze the microstructure of the surface passive film after pickling with hydrochloric acid and mixed acid (HNO₃+HF). The corrosion resistance of the steel after pickling was analyzed by using electrochemical testing methods. Further, an evolution model of oxide layer removal during shot peening and pickling of the hot rolled 2205 duplex steel sheet after annealing was proposed. The results show that the shot peening treatment has significant effect on the removal of Fe-rich oxide in the 2205 duplex steel surface layer, but the dense Cr-rich oxide layer within the inner layer cannot be removed. Hydrochloric acid pre-pickling can further remove the dense oxide layer from outside to inside after shot peening, and the final pickling with nitric acid and hydrofluoric acid can remove the Cr-poor layer produced by annealing, so that a Cr₂O₃-rich passive film is formed on the steel surface. The 2205 duplex steel after mixed acid pickling shows higher self-corrosion potential and larger arc resistance radius than that of hydrochloric acid pre-acid pickling, indicating that mixed acid pickling is beneficial to improve the corrosion resistance of 2205 duplex stainless steel.

Key words: 2205 duplex stainless steel, shot peening, pickling, oxide layer

中图分类号:

TG178

王剑, 孟浩杰, 李朋, 李国平, 李俊, 刘洁, 韩培德. 喷丸和盐酸酸洗对2205双相不锈钢热轧板氧化层微观结构的影响[J]. 金属热处理, 2021, 46(2): 74-80.

Wang Jian, Meng Haojie, Li Peng, Li Guoping, Li Jun, Liu Jie, Han Peide. Effect of shot peening and hydrochloric acid pickling on oxide layer microstructure of 2205 duplex stainless steel hot-rolled sheet[J]. Heat Treatment of Metals, 2021, 46(2): 74-80.

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喷丸和盐酸酸洗对2205双相不锈钢热轧板氧化层微观结构的影响

Effect of shot peening and hydrochloric acid pickling on oxide layer microstructure of 2205 duplex stainless steel hot-rolled sheet

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