[DeTomaso] Powdercoating Campi rims

[Joseph F. Byrd, Jr.]

I have had a little association with heat treatment techniques for other equipment, so here are my thoughts

The annealing process is the controlled cooling of the metal once it has been held at the relieving temperature for the specific time.  the concept of the annealing cool down is that you would like for the inside metal temperature to cool down before the outer (which is not going to happen).  So the next is to try and let both the inside and outside cool down the same.

If you allow the outer to cool quicker, the thermal contraction of the outer layer over the thermally expanded inner core will cause the outer layer to stretch.  This will put mechanical stress in the outer layer (or worse cause it to crack).

So I would be against a process where there was multiple heating and (uncontrolled) cooling as this would be like working the paper clip back and forth (work hardening) and increase the chance of cracking

It is not the fact it cooled "over night" , but the need is for a slow, Controlled cool down ( I have not researched what that rate would be for Mg.

-----Original Message-----
From: DeTomaso [mailto:detomaso-bounces at poca.com] On Behalf Of Rob Dumoulin
Sent: Wednesday, September 23, 2015 15:45 PM
To: 576103; Pantera - DeTomaso Mail List
Subject: Re: [DeTomaso] Powdercoating Campi rims

Would it do the same result if he insists on heating them multiple times rather than one time with an overnight cooling?