Thanks, Roger. We were told by the coating house that they can't repeat the process. They may not know that stripping is an option. 

The coating is yellow/gold chromate on 3003 Aluminum.

Blair

On Fri, 2 Sep 2016 09:40:59 -0700, EIMCNews <[log in to unmask]> wrote:

>Further to your question you say "the process can't be repeated, so we either scrap the parts and make new ones, or use them as is."  What does the "coating" house say?
>
>Chromated parts can be stripped (of the chromate), activated and chromated again, depending on what the original base metal is.
>
>Roger Mouton
>EIMC Advanced Plating Technologies
>
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Blair Hogg
>Sent: Friday, September 02, 2016 7:45 AM
>To: [log in to unmask]
>Subject: [TN] Chromate coatings
>
>Hi Technetters! Getting ready for the long weekend (at least here in the US)?
>
>I'm looking for some advice on chromate coatings. We produce a phone for mining applications, which uses a battery held in by a bracket. The bracket is chromate coated. 
>
>The most recent batch of brackets sent out to the coating house came back with a cloudy appearance to the coating. Apparently something hiccupped in their process. The process can't be repeated, so we either scrap the parts and make new ones, or use them as is. Problem is, I don't know if the cloudy appearance will affect the corrosion protection properties. Any chromate experts out there that can offer any advice on this?
>
>Thanks,
>Blair
>
>
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