This variety of sheet is also known as Electrolytic
Zinc coated and Zinc-Iron Alloy coated sheet in which 12-15% is iron
coating on either one or two sides of the carbon steel sheet. The coated
sheet resembles a Cold rolled steel sheet and has a matte finish. Such a
surface finish is ideal for application where a high quality finish is
required even after painting like in the exposed parts of the
automobiles.
The
coating on the steel sheet proves to be ideal for forming and joining
operations since the electrolytic deposition gives a good control for
such activities. Automatic and robotic welding yield the best results in
such electro galvanized steel sheet. The surface of this steel sheet is
easy to paint but for better results the surface should ideally be
penetrated and then primed before the last coat of paint is applied.
Zinc and Zinc-iron alloy proves to be good against corrosion for steel.
It has been found that Zinc-iron alloy corrodes slowly than Zinc hence
it is evident that a similar protection can be achieved by a thin
coating of alloy instead of pure zinc. Both the coatings however provide
good levels of adhesion during forming operations. It has been found out
that the zinc-iron alloy coating is more stronger than the pure zinc
coating and is resistant to manufacturing damage during handling and
stamping processes. The electro galvanized sheets can be stretched, deep
drawn and lock seamed by such processes as soldering, welding and
adhesive bonding thus ensuring easy application on the end user's part.
Applications
The Electro galvanized steel sheet is ideal to use in places where the
corrosion resistance quality of zinc is demanded. Such sheets are widely
used in automobile body parts like, deck lids, hoods, fenders meaning
all the exposed portions of the automobile. The matte finish and the
sheet durability helps in rigorous manufacturing processes.
