Cast iron zinc galvanizing improved by high temperature oxidation process

• Autorzy: Jędrzejczyk, D. , Hajduga, M.
• Języki publikacji: EN

Abstrakty

EN

Purpose: To evaluate influence of the high-temperature oxidation, as the preliminary stage previous to coating with zinc on the change of surface layer structure as well as subsurface layer of cast iron with flake, vermicular and nodular graphite. Design/methodology/approach: The experiment was led in the temperature range: 850-1050ºC in ambient air. Samples have been taken out from the furnace separately after: 2-12 hours. After scale layer removal the hot dip zinc coating in industrial conditions has carried out. Received effects were compared to these obtained during cast iron coating without preliminary thermal processing. To observation both optical and scanning microscope was applied. Sample’s surface quality was described additionally by roughness measurements. Findings: As the consequence of conducted high-temperature oxidation in subsurface layer of cast iron pores have been created, that in result of coating in liquid zinc were filled with new phase and in this way the new zone with different properties was obtained. Cast iron layer enriched in zinc is considerably thicker than layers got with application of other methods. Research limitations/implications: It is suggested to verify the corrosion resistance of cast iron coated with zinc according to presented method and compare of got results with classic zinc coating effects. Practical implications: The proposed method consisted on combining of hot dip zinc coating of cast iron with previous high temperature oxidation makes possible creation of sub-surface layer with composite character, composed of “after -graphite” voids filled with zinc and metallic matrix, without necessity of pressure processing. Originality/value: New application of high temperature corrosion as the heat treatment improving effects obtained after cast iron zinc coating.

Słowa kluczowe

PL

utlenianie wysokotemperaturowe; cynkowanie ogniowe; żeliwo

EN

high temperature oxidation; hot-dip zinc galvanizing; cast iron

• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2010
• Tom: Vol. 43, nr 1
• Strony: 418--423
• Opis fizyczny: Bibliogr. 13 poz., rys., tab., wykr.

Twórcy

autor

Jędrzejczyk, D.

• University of Bielsko-Biala, ul. Willowa 2, 43-309 Bielsko-Biała, Poland,

autor

Hajduga, M.

• University of Bielsko-Biala, ul. Willowa 2, 43-309 Bielsko-Biała, Poland

Bibliografia

• [1] W. Kofstad, High Temperature Corrosion, Elsevier Applied Science, London, 1988.
• [2] K. Hauffe, Oxidation of Metals, Plenum Press, New York, 1965.
• [3] O. Kubaschewski, B.E. Hopkins, Oxidation of Metals and Alloys, Butterworths, London,1967.
• [4] M. Hajduga, D. Jędrzejczyk, Z. Jurasz, Influence of Fe-samples diameter on the process of oxidation at high temperature, Proceedings of the 8th International Metallurgical Symposium METAL’99, Ostrava, 2009, 33-38.
• [5] H.D. Merchant, Oxidation behaviour of graphitic and white cast iron, Gordon and Breach, London, 1968.
• [6] C. Pehlan, Comparison between the oxidation of unalloyed and low alloyed cast iron with lamellar and spheroidal graphite, Georgi Publishing Company, 1975.
• [7] D. Kopyciński, E. Guzik, W. Wołczyński, Creation of the zinc layer at the surface of nodular cast iron industry fittings, Materials Engineering 4 (2006) 1081-1084 (in Polish).
• [8] D. Kopyciński, E. Guzik, W. Wołczyński, Coating Zn formation during hot dip galvanizing, Materials Engineering 4 (2008) 289-292.
• [9] J. Banaś, E. Guzik, D. Kopyciński, U. Lelek-Borkowaska, M. Starowicz, The effect of forming of zinc coating on their corrosion resistance, Materials Engineering 3-4 (2007) 750-756.
• [10] D. Kopyciński, E. Guzik, Zinc layer at the nodular cast iron surface. Materials Engineering 6 (2008) 780-783 (in Polish).
• [11] O. Kubaschewski, Iron-Binary Phase Diagrams, Berlin, Springer-Verlag, 1982.
• [12] P.B. Burton, P. Perrot, Phase Diagram of Binary Iron Alloys. American Society for Metals, Metal Park. OH, 1993, 459-466.
• [13] T.B. Masalski, Binary Alloy Phase Diagrams. ASM International, 1990.