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Effect of the Solution Annealing and Chemical Passivation Followed by Aging on the Corrosion of Shell Mold Cast CF8 Stainless Steel

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Abstract

The effects of solution annealing and passivation of shell mold cast CF8 stainless steels on Elbow pipe fittings with 2-month room temperature aging have been studied using a corrosion technique. The resistance of corrosion increased with 2-month room temperature aging combined with solid solution annealing and chemical passivation. The mode of corrosion was deeply related to the δ-ferrite content, permeability, and passivation. The corrosion probability decreased as both the δ-ferrite content and the permeability decreased. Therefore, it is considered that δ-ferrite content and passive film of Cr2O3 play an important role in corrosion resistance of CF8 Elbow pipe fittings due to the long-term aging with solid solution annealing and chemical passivation. This result shows that the corrosion resistance of CF8 fittings can be enhanced by the solid solution annealing and chemical passivation. Decreased ferrite phases and permeability improve IGC resistance in CF8 steel.

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Authors and Affiliations

  1. HI-STEN Co., Ltd.,, Gimhae, Korea

    Kuk-Jin Kim (Researcher) & Sung Joon Pak (Senior Researcher)

  2. Department of Nano-Physics, College of Bionanotechnology, Gachon University, Gyeonggi-Do, Korea

    Heongkyu Ju (Professor)

  3. Division of Mechanical Engineering, Kyungnam University, Changwon, Korea

    Young-Dae Moon

  4. KITECH, Incheon, Korea

    Jun Ho Hong

Authors
  1. Kuk-Jin Kim
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  2. Heongkyu Ju
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  3. Young-Dae Moon
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  4. Jun Ho Hong
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  5. Sung Joon Pak
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Corresponding author

Correspondence to Sung Joon Pak.

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Manuscript submitted March 22, 2015.

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Kim, KJ., Ju, H., Moon, YD. et al. Effect of the Solution Annealing and Chemical Passivation Followed by Aging on the Corrosion of Shell Mold Cast CF8 Stainless Steel. Metall Mater Trans A 47, 4979–4982 (2016). https://doi.org/10.1007/s11661-016-3676-3

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  • DOI: https://doi.org/10.1007/s11661-016-3676-3

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