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substitute for zinc dipped steel

I received a call from someone working for a company (wants to stay
anonymous for now) .  They manufacture cold rolled steel components
for commercial construction suspension systems.  They want to improve
their product's corrosion resistance by swiching to a hot dipped
zinc/galvanizing system.   They want to know two things: 

Is there a environmentally better substitute for hot dip zinc/galvan steel?
If they use hot dip zinc/galv/steel, is there a market for the scrap they will

Jim Lounsbury
703-308-8463:  Fax 703-308-8433