Microstructural development of galvanized steels prepared with Ni-P electroless deposited pre-coatings

Authors

  • Chulaluk Somphotch Faculty of Engineering, Chulalongkorn University
  • Suparoek Henpraserttae National Metal and Materials Technology Center (MTEC), NSTDA
  • Ekasit Nisarattanaporn Faculty of Engineering, Chulalongkorn University
  • Yuttanant Boonyongmaneerat Metallurgy and Materials Science Research Institute, Chulalongkorn University

Keywords:

Galvanizing, Coatings, Electroless deposition, Ni-P alloys, Phase transformation

Abstract

An electroless pre-coating process is investigated as a possible method to prevent the sandelin effect, whereby steels containing silicon reacts rapidly with zinc during galvanization. From the microstructural and kinetics analysis, it is found that nickel-phosphorus electroless pre-coatings effectively serve as barriers to the reaction between Fe and Zn during galvanization, regardless of the silicon content in the steel substrates.  Correspondingly, the coating thickness of the galvanized steels can be well-controlled.    

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References

ASTM A153, Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware.

Yasuo, U., Hideto, K., Yoshifumi, I. and Koichi, F. (1984). Immersion Time Dependence of the Reaction between Fe–Si Alloys and Liquid Zinc. Trans. Jpn. Inst. Met. 25(8) : 545-552.

Yasuo, U., Hideto, K. and Hiroaki, I. (1983). Reaction between Fe–Si Alloys and Liquid Zinc. Trans. Jpn. Inst. Met. 24(5) : 272-280.

Lewis, G.P. and Pedersen, J. (1996). Optimizing The Nickel-Zinc Process for Hot Dip Galvanizing. Cominco Ltd., 3rd Asian Pasific General Galvanizing Conferance, Australia. p.1-8.

Sa-nguanmoo, R., Nisaratanaporn, E. and Boonyongmaneerat, Y. (2011). Hot-dip galvanization with pulse-electrodeposited nickel pre-coatings. Corr. Sci. 53(1) : 122-126.

Che, C., Lu, J., Kong, G., Xu, Q. and Sui, R. (2007). Influence of Ni-electrodeposited pretreatment on galvanized coatings of reactive steels. J. Wuhan Univ. Technol. Mater. Sci. Ed. 22(2) : 221-224.

Higashi, K., Hayashi, Y., Fukushima, H, Akiyama, T. and Hagi, H. (1990). A fundamental study of corrosion-resistant zinc-nickel electroplating. NIDI Technical series N. 10036 . p.54

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Published

2014-12-01

How to Cite

[1]
C. Somphotch, S. Henpraserttae, E. . Nisarattanaporn, and Y. Boonyongmaneerat, “Microstructural development of galvanized steels prepared with Ni-P electroless deposited pre-coatings”, J Met Mater Miner, vol. 24, no. 2, Dec. 2014.

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Original Research Articles