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Journal of Iron and Steel Research International

, Volume 26, Issue 9, pp 1000–1010 | Cite as

Effects of Cr content on corrosion behaviour and corrosion products of spring steels

  • Mao-fang Zuo
  • Yin-li Chen
  • Zhen-li MiEmail author
  • Yi-de Wang
  • Hai-tao Jiang
Original Paper
  • 33 Downloads

Abstract

Neutral salt spray corrosion experiments of spring steels with different Cr contents were carried out for different corrosion periods. The optical microscope was used to observe the macroscopic corrosion morphology of the steel surface. The corrosion pit morphology of steel surface was observed by laser scanning confocal microscopy and scanning electron microscopy, and three-dimensional simulation was carried out. At the same time, the corrosion products (rust layer) were qualitatively and quantitatively analysed by X-ray diffraction. As the results show, Cr is beneficial to improving corrosion resistance of the experimental steel matrix, and the higher the content of Cr, the stronger the corrosion resistance will be. With increase in Cr content in steel, the development of corrosion process will be more effectively suppressed. With the increase in Cr content, the denser the corrosion products, the stronger the bond with the metal matrix is. The corrosion products have obvious stratification; the outer layer is mainly composed of γ-FeOOH, which is relatively loose and not firmly integrated with the matrix, while the inner layer contains α-FeOOH and Fe3O4, which are relatively dense and closely integrated with the matrix. The types of corrosion are constantly changing during different phases of corrosion.

Keywords

Spring steel Cr content Corrosion behaviour Corrosion product Rust layer 

Notes

Acknowledgements

The authors acknowledge the financial support from the National Key R&D Program of China (2017YFB0304900).

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Copyright information

© China Iron and Steel Research Institute Group 2019

Authors and Affiliations

  • Mao-fang Zuo
    • 1
  • Yin-li Chen
    • 2
  • Zhen-li Mi
    • 1
    Email author
  • Yi-de Wang
    • 1
  • Hai-tao Jiang
    • 1
  1. 1.Institute of Engineering TechnologyUniversity of Science and Technology BeijingBeijingChina
  2. 2.Collaborative Innovation Center of Steel TechnologyUniversity of Science and Technology BeijingBeijingChina

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