Page 57 - MetalForming November 2019

The Science of Forming
60 YEARS DEDICAT
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zinc to inter-diffuse, creating a hot-dip galvanneal (GA) coating. Unlike hot-dip galvanized surfaces, galvannealed steels can be produced for surface-critical applications.
Coating composition averages approximately 90-percent zinc and 10-percent iron, but is not uniform through the coating thickness. The greatest iron concentration occurs at the former interface between the steel and coating, and decreases closer to the surface, where the zinc concentration is the greatest. Different zinc-iron phases are produced, depending on the relative concentrations at each distance from the surface. These phases have different properties, including hardness, friction and powdering resistance.
All metal alloys corrode, zinc coatings included. Whereas the corrosion product of electrogalvanized and hot-dip gal- vanized coatings is white, iron in galvanneal coating makes the corrosion product appear red. This discoloration does not necessarily indicate rusting of the underlying steel.
For topics you’d like to see addressed in future columns, email me at scienceofforming@eqsgroup.com. MF
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