|
|
|
![]() |
The electroless nickel plater smoked my tool steel extrusion head [Minnesota]August 1, 2007 Hi I need some help to understand what went wrong.I had a
extrusion head made of tool steel which has been plated approx. 10
times. the last time I tried to have it plated the company called me
and said the head had been destroyed during the strippng process. a
2" thick by 3" wide piece of tool steel turned into a 1" piece of
charcol. can anyone explain how this would happen? Randy Bodin
August 4, 2007 -- 1st of two simultaneous responses They forgot and left your die in nitric acid (perhaps overnight,
maybe over weekend!). If they value your business and their prestige,
they must pay for another die. If you want to be indulgent and keep
them as suppliers, give them more jobs to let them get even. If you
also want to be helpfull, tell them there are proprietary strippers
(like the ones that advertise here)that prevent such accidents. Guillermo Marrufo
August 4, 2007 -- 2nd of two simultaneous responses Much as tool steel is different than say 1018 steel, all electroless nickels (EN)are not alike. There are high phos, low phos and phos levels in between. On top of that there is EN co-deposited with PTFE, cubic boron nitride and / or silicon carbide. Subsequently hardened EN via precipiation hardening heat treatment once again changes the mechanical and chemical properties of the deposit. If a plater believes that a plated die or mold is high phos, they'er used to parts being in a strip for up to a week in some cases. One way to kick off the stripping of these coatings is to start off in nitric acid. If one tries this and it turns out to be another type of EN, the coating can be readily stripped in minutes and then the nitric would attack the tool steel. It's impossible to tell; what did your plater say? Is he the same plater that has successfully stripped and re-plated it in the past? It's an interesting story but parts that have been stripped and re-plated several times over don't just all of a sudden become dissolved IF THE SAME PROCESS IS USED.
August 6, 2007 Thanks for giving me some insight on this. Randy Bodin
September 7, 2007 EASY TO EXPLAIN Jose Castellanos
![]() |
|
Save
This Page (why?) - Home - ©1995-2008 finishing.com