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Zinc plating vs. galvanizing for hollow metal doors?

We are steel hollow metal door manufacturer. We believe that using electrogalvanized steel for manufacturing doors is better than using hot dipped galvanized steel. Is this correct?

We also believe that hot dipped galvanizing is better when you apply it to a finish product, but when you still have to cut, bend and punch holes into the steel, then electrogalvanizing is better. After all, you can not hot dip a steel door after the manufacturing process is completed.

Joaquin Taule
Buyer of Steel - Puerto Rico
July 28, 2008

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First of two simultaneous responses -- August 2, 2008

Que tal Joaquin,

You must consider the final use of the door. If it will be in the exterior then it is much better to use the hot dip process, you will get a thicker plating. And I do not think the size would be a problem, there are galvanizers that have kettles 2 mts deep and more than 7 mts long.

Other aspect to consider is geometry, for both process geometry and assembling will affect in the plating. Go with platers in your zone and review the design of the door in order to review the your design and possbile issues that may come afloat.

Saludos.

Guillermo Castorena
Jobshop - San Luis Potosi, Mexico

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Second of two simultaneous responses --

I am not sure whether it is a question or a statement. However, yes you are correct. Galvanized metal is more appropriate for exterior construction work - girders, etc. The substrate you use is OK as the purchaser may wish to paint it after purchase.

Terry Hickling
Birmingham, United Kingdom
August 2, 2008