Precision Steel provides a table of the properties for galvannealed coated metals. 

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Quick Comparison
Appearance Paint Corrosion Forming Solder
4 - Good 5 - Excellent 5 - Excellent 4 - Good 4 - Good
Detailed Comparison
Product Description Carbon Sheet Steel with a zinc coating both sides that has been heat treated to form an iron-zinc alloy layer underneath the zinc and on top of steel.
Appearance Description Light Grey Matte Finish. Best use is for painted applications.
Paint Description Can be painted in the as shipped condition. Some applications may need a primer before painting.
Corrosion Description For long-lasting corrosion protection when painted properly.
Forming Description Forms similar to hot dipped galvanized however, the iron-zinc alloy may powder on the compression side when severely formed.
Solder Description Need good fluxing agent.