The following table summarises some metal coating typically used in industrial applications, car manufacturing and the building industry. These coatings are usually produced in continuous metal coating lines.
Major Elements in Coating (approx. mass%)
Typical Coating Mass/Thickness (g m-2/um)
|Electroplated Zinc||Zn 99.9||75/10|
|Galvanneal||Zn 89 Fe 11 Al 0.2||40-60/6-8||Zn rich surface, relatively uniform centre section in good coatings and increasing Fe near steel|
|Hot-dipped galvanized steel||Zn 99 Al 0.3 Pb/Sb 0.2||70-140/10-20||Al enriched at surface and coating/steel interface. Sometimes C and H seen at the interface depending on the level of steel cleanliness|
|Galfan||Zn 95 Al 5% La+Ce trace||60-140/9-20|
|Aluzinc||Zn 70 Al 30||60-140/10-20|
|Galvalume||Zn 44 Al 55 Si 1.5||80/21||Regions rich in Zn and others rich in Al (because of limited solubility), Si increasing towards coating/steel interface, a Al/Zn/Si/Fe quaternary|
|Aluminium coated steel||Al 99||40/5|
|Electroplated Zinc-Nickel coated steel||Zn 89 Ni 11||45/6||Normally very uniform coating|
First published on the web: 15 January 2000.
Author: Richard Payling