THE INVESTIGATION OF HIGH TEMPERATURE OXIDATION IN ALUMINIUM COATINGS USING HOT DEEP METHOD ON STEEL MATERIALS

Abstract

In this study, the surface of SAE 1020 and AISI 316 were applied to aluminium (Al) coating by hot deep method. The oxidation resistance and microstructures were investigated of Al coating applied to the surface of different steels. Sample surfaces were coated with Al at the temperature of 750 °C in 10 minutes durations. Experimental samples were subjected to at the 800 °C temperature and diffusion tempering with 1 and 6 hours durations. The changes in the thickness of diffusion layer and microstructure of the surface, as a result of the processes applied, were examined. Weight variations in the samples oxidized in atmospheric conditions under the temperature of 900 °C with varying durations have also been measured. It was found that steel material which changes of little weight of the samples coated with Al resisted more than without coated Al for oxidation. It was indicated that coated with Al surface of steel protected from oxidation The changes of elements Fe, C, Al, Ni and Cr were investigated by microprobe analyses in surface region

Keywords

• Aluminium coating, oxidation, microprobe, element diffusion

SICAK DALDIRMA YÖNTEMİ İLE ALÜMİNYUM KAPLANAN ÇELİK MALZEMELERDE YÜKSEK SICAKLIK OKSİDASYONUNUN İNCELENMESİ

Abstract

Bu çalışmada, genel yapı çeliği (Ç1020) ve paslanmaz çelik (AISI 316) malzemelerin yüzeyine sıcak daldırma yöntemiyle alüminyum (Al) kaplama uygulanmıştır. Yüzeyde oluşan Al kaplamanın mikroyapısı incelenerek, yüksek sıcaklık oksitlenmesine karşı gösterdiği direnç incelenmiştir. Numuneler 750 °C’deki sıvı Al içinde 10 dakika süreyle bekletilerek yüzeyleri Al ile kaplanmıştır. Daha sonra bu numunelere 800 °C sıcaklıkta 1 ve 6 saat süre ile nötr ortamda difüzyon tavlaması uygulanmıştır. Elementlerin difüzyonu, difüzyon tabakası kalınlığı ve oksitlenmeye karşı gösterdiği direnç incelenmiştir. Al kaplama yapılan ve yapılmayan numuneler 900 °C sıcaklıkta ve farklı sürelerde yüksek sıcaklık oksidasyonuna maruz bırakılarak yüzeyde oluşan ağırlık değişimleri ölçülmüştür. Al kaplanmış çelik numunelerde önemli miktarda ağırlık değişimi olmaması, Al kaplamanın çeliği oksitlenmeden koruduğunu göstermiştir. Malzemelerin bileşimindeki Fe, C, Al, Ni ve Cr elementlerinin Al kaplama ve difüzyon tabakasındaki değişimleri mikroprob analizi ile incelenmiştir

Keywords

• Alüminyum kaplama, oksidasyon, mikroprob, element difüzyonu

References

1. Awan G. H., (2007): “The Morphology of Coating-Substrate Interface in Hot-Dip-Aluminized Steels”, University of Engineering and Technology Lahore, PhD Thesis,
2. Awan G. H., Ahmed F., Ali L., Shuja M. S., Hasan F., (2008): “Effect of Coating-thickness on the Formability of Hot Dip Aluminized Steel”, Pak. J. Engg. Appl. Sci. Vol. 2. pp.14-21.
3. An, J., Liu, Y.B., Zhang, M.Z., Yang, B., (2002): ”Effect of Si on the interfacial bonding strength of Al–Pb alloy strips and hot-dip aluminized steel sheets by hot Rolling”, Journal of Materials Processing Technology 120, pp. 30–36.
4. Bondareko, G.G., Borodulin, I.N., (1985): “Improving the Heat Resistance of Austenitic Steels by Thermomechanical Treatment Method”, Metal Science and Heat Treatment 27, pp. 624–627.
5. Çakır, A., (1998): “Korozyon Açısından Tasarım ve Malzeme Seçimi” 6. Korozyon Sempozyumu, İzmir.
6. Çakır, A., (1990): “Metalik Korozyon İlkeleri ve Kontrolü”, s. 223-231, MMO Yayını.
7. Drewolt, R., (1969): “Diffusion Coatings for the Protection of Iron and Steel”, Anti Corrosion, pp. 11-15.
8. Fang H.W., Li K.Y., Su T.L., Yang T.C.K., Chang J.S., Lin P.L., Chang W.C., (2008): “Dip coating assisted polylactic acid deposition on steel surface: Film thickness affected by drag force and gravity”, Materials Letters, Vol 62, Iss. 21-22, pp. 3739-3741.

9. Feliu, S., Barranco, V., (2003): “XPS study of the surface chemistry of conventional hot-dip galvanised pure Zn, galvanneal and Zn–Al alloy coatings on steel”, Acta Materialia 51 pp. 5413–5424.
10. Glasbrenner, H., Nold, E., Voss, Z., (1997): “The influence of alloying elements on the hot- dip aluminizing process and on the subsequent high-temperature oxidation”, J Nuclear Materials, pp. 24939–45.
11. Guillou L., Supiot Ph., Courtois V. L, (2008): “Oxidized barrier thin film from plasma grown polysiloxane coating over austenitic stainless steel, Surface and Coatings Technology, Vol 202, Issue 17, pp 4233-4241.
12. Hocking, M.G., (1993): “Coatings Resistant to Erosive/Corrosive and Severe Environments”, Surface and Coating Technology, 62, pp. 460-466.
13. Hwang, S. H., Song, J.H., Kim, Y.S., (2005): “Effects of carbon content of carbon steel on its dissolution into a molten aluminium alloy”, Materials Science and Engineering A 390 pp. 437–443.
14. Kasaplar G., (2007): “Aluminyum Yüzeyindeki Oksit Tabakasının Okzalik Asit Anodizing Yöntemiyle Geliştirilmesi”, Çukurova U. Fen Bil. Ens., Y L. Tezi.
15. Lee HY, Jung S.H, Lee SY, You YH, Ko, KH, (2005): “Correlation between Al2O3 particles and interface of Al-Al2O3 coatings by cold spray”, Applied Surface Science. Vol. 252, No. 5, pp. 1891-1898.
16. Pasinli, A., Köksal, N.S, (2004): “Alüminyum Kaplanan Çelik Malzemelerde Yüzey Özelliklerinin İncelenmesi”, Mühendis ve Makina Dergisi, Sayı 536, S. 42–45.
17. Patermarakis, G., Moussoutzanis, K., (2003): “A Transport Phenomenon Analysis Criterion Predicting Pitting Appearance During Al Anodizing In Sulphate Electrolytes”, Chemical Engineering Communications, 190 (5): p. 1018–1040.
18. Stein-Fechner, K., Konys, J., Wederneyer, O., (1997),: “Investigations on the transformation behaviour of the intermetallic phase (Fe, Cr)2Als formed on MANET II steel by aluminizing”, J. Nucl. Mater. 249, pp. 33–38.
19. Tanaka J., Masumoto R., Ohsasa K., Narita T. (2002): “Effect of Mg and Si on the Microstructure and Corrosion Behavior on Zn-Al Hot Dip Coatings on Low Carbon Steel”, ISIJ International, Vol. 42, No:1, pp. 80-85.
20. Temel, A., (2002): “Alüminyum Alaşımlarının Korozyonu”, Makine Metal Teknolojileri Dergisi, S.117.
21. Vagge S.T., Raja V.S. (2009): “Influence of strontium on electrochemical corrosion behavior of hot-dip galvanized coating”, Surface and Coatings Technology, in Pres.
22. Yan, L., (2001): “Corrosion behaviour of hot dip zinc and zinc–aluminium coatings on steel in seawater”, Bull. Mater. Sci., Vol. 24, No. 4, pp. 355–360.
23. Zhang Y., Pint BA., Garner GW., Cooley KM., Haynes JA, (2004): “Effect of cycle length on the oxidation performance of iron aluminide coatings”, Surface and Coatings Technology, Vol. 188-189, pp 35-40.
24. Zhaolin Z, Yedong H, Li L, Hongxi L, Yongnian D., (2009): “Low-temperature formation and oxidation resistance of ultrafine aluminide coatings on Ni-base superalloy”, Surface and Coatings Technology, Vol. 203, Issue 16, pp 2337-2342