Study the Effect of Aluminum Variation on Hardness & Aluminum Loss in Zn-Al Alloy
The objective of this research is to study the hardness &aluminiumloss with percentage variation in Aluminium content added to zinc. As there is a method for coating known as Galfan is available, in which combination of 95%zinc and 5% Aluminium is used for protecting steel from corrosion.As there are not much details available about why this composition is used Zinc-5%Al, we are interested in study of effects of different composition of Aluminum with Zinc, so we study the effect by adding different composition 2.5%,4.5%,6.5%,8.5% & 11.5% Aluminum in Zinc, for this study we are using hot dip galvanizing process for studying this coating. Hot-dip galvanizing is widely used to improve the corrosion resistance of steel. To obtain high-quality coatings, some alloy elements are added to the zinc bath. Aluminum is one of the most important elements in galvanizing.Fe-Al phase diagram indicated thatα Fe is obtained between 1 to 11% of AluminiumGalfan alloy consist of 95% Zn and 5% Al. It was decided to study the effect of variation in Al content in ZincAluminium alloy .Also during melting of this alloy we wanted to observed loss of Al due to oxidation hence the above compositions were decided.
GALFAN--A NEW ZINC-ALLOY COATED STEEL FOR AUTOMOTIVE BODY USE
A new corrosion-resistant coating system, known as Galfan, has been developed for steel sheet and wire. This alloy consists of eutectic zinc-5% aluminum plus a small addition of mischmetal (less than 0.1%). It has demonstrated corrosion resistance more than twice that of conventional galvanized steel sheet or wire under similar conditions and similar coating thicknesses. The coating also has extremely good ductility under cold forming conditions and behaves comparably to conventional galvanized steel sheet with respect to spot weldability and paintability. The bath operating temperature is slightly lower than required for conventional continuous galvanizing baths, providing maximum economy in energy utilization and compatibility in coating high carbon steel spring wire. Conventional continuous galvanizing lines of the Sendzimir, Selas or Heurtey type can be converted to Galfan coating with a nominal capital investment, provided a cast iron or ceramic crucible is available. Recent research shows that Galfan may be adaptable to a Cook-Norteman continuous galvanizing line and to batch galvanizing. The development of this product fills a commercial need for a superior product with minimal changes in established conventional galvanizing processing methods.
Fe–AI–Zn ternary phase diagram at 450°C
AbstractSeveral Fe–Al and Fe–Al–Zn alloys were vacuum melted, annealed at 450°C under atmospheric pressure, and then quenched in iced water. The structure and composition of phases were determined using microstructural, X-ray diffraction, and X-ray energy dispersive analyses. The maximum solubility of zinc was found to be 5·3 wt-% in FeAl3, 20·9 wt-% in Fe2Al5, and 2·0 wt-% in FeAl at 450°C. Based on these results, an isothermal section for the aluminium rich corner of the Fe–Al–Zn ternary phase diagram is proposed.MST/1196