Investigation of Nickel Effects on Matt Cast Iron Enamel

Year 2020, Volume: 4 Issue: 2, 10 - 17, 29.06.2020

Yasin Bozkurt Yılmaz , Nurullah Çöpoğlu , Tamer Cengiz Buğra Çiçek

Abstract

Cast iron is the generic name for iron-carbon
alloys containing more than 2% carbon content. It can melt at low temperatures
compared to steel and has low cost. The surfaces of cast irons, which can be
used in many areas from construction to kitchen equipment, are coated with
enamel to prevent corrosion, increase wear resistance and easy to clean.
Enamels are glassy coating materials obtained by adding various oxides such as
Al2O3, B2O3, ZrO2, NiO, CoO into SiO2. The raw materials used and the oxides
formed during production have a direct effect on the end product properties of
the enamel. NiO and CoO are the most essential oxides affecting the bonding
performance of the enamel to the metallic surface. Although NiO has little
effect on glassy structures, it improves the adherence performance. It is also
effective on the aesthetic appearance of the enamel. It gives a dark color to
the enamel and prevents fish scale defects, with the latest regulations, the
use of nickel in enamels has been restricted for health and environmental
safety reasons. For this reason, studies have started to develop a new
generation of nickel-free enamels suitable for regulations. In this study, the
development of enamel that can be applied to cast iron surfaces having a matt
appearance that does not contain nickel and the effect of nickel on enamel
properties were investigated. In the existing frit compositions, new frit
recipes were prepared, which did not contain nickel and were applied to cast
iron surfaces by wet application method. Heat microscopy analysis of prepared
frit was performed. Microstructure, chemical abrasion resistance, color
properties, surface properties, coating adherence performance, and the effect
of nickel on these properties were investigated. 

Keywords

enamel, cast iron, nickel free, metal coatings

References

• W. D. Callister Jr, Materials Science and Engineering - An Introduction. John Wiley & Sons, (2000).
• H. T. Angus, Cast Iron: Physical and Engineering Properties. Elsevier, (1976)
• A. I. Andrews, Porcelain (vitreous) Enamels and Industrial Enamelling Processes: The Preparation, Application, and Properties of Enamels, 3rd ed. Tipografia, (2010)
• X. Yang, A. Jha, R. Brydson, and R. . Cochrane, “The effects of a nickel oxide precoat on the gas bubble structures and fish-scaling resistance in vitreous enamels,” Mater. Sci. Eng. A, vol. 366, no. 2, pp. 254–261, Feb. (2004) DOI:10.1016/j.msea.2003.08.003
• K. Benzeşik, M. İpekçi, A. Yeşilçubuk, F. Ç. Şahin, and O. Yücel, “Optimizing the Migration Behavior of Enamel Coatings Used as Food Contact Materials,” in 19th International Metallurgy & Materials Congress, (2018)
• “Food contact Material Vitreous and Porcelain Enamel : Migration from enamelled articles made for food contact – Method of test and permissible limits”European Enamel Authority (2016)