Dear All

this question is a more RoHS orientated, however it is associated with
metallurgy, I'm a bit confused as I'd not heard of it before.

   What chromate conversions involve Hexavalant Chrome (this applies to
   fixings, screws etc).  I've been told that both the Nickel Plate and
   Zinc Chromate platings use Hexavalant chrome.  Is this true? or have I
   been miss-informed.

   The issue fo us especially concerns steel parts that have a zinc
   chromate finish.  This is also known as zinc clear and /or zinc clear
   chromate.  The problem is that this process results in the part having a
   coating of Hexavalent VI chrome.  I am not a metallurgist, but have been
   informed that when tested, the directive of having no more than 0.1% by
   weight will be exceeded, by parts large in surface area.

regards

Paul
Paul R Taylor
Technical Advisor
Pitney Bowes Ltd email: [log in to unmask]
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