[ARC5] Aluminum Surface Finish on SCR-274 Stuff

[J. Forster]

---------------------------- Original Message ----------------------------
Subject: Re: [Milsurplus] Painting Aluminum - BC-348 in particular
From:    "gl4d21a at juno.com" <gl4d21a at juno.com>
Date:    Sat, May 15, 2010 5:35 pm
To:      garypewitt at centurytel.net
Cc:      WA5CAB at cs.com
         milsurplus at mailman.qth.net
--------------------------------------------------------------------------

We must differentiate here between Zinc Chromate primer, a coating sort of
like paint, and Chromate conversion corrosion proofing, a dip in a
specific mix of chemicals which produces a film of converted aluminum on
the surface of the metal.  The latter is often referred to as Alodine, or
Iridite, both trademarked processes.  Google either of these terms for
process details.

Zinc Chromate can be applied as any paint is applied; dip, spray, or
brush, while Alodine is a dip process.  I don't think I've ever heard of
sprayed Alodine, although it should be possible, and inefficient use of
materials.

Anodizing is yet another process not covered here.

73,
George
W5VPQ

---------- Original Message ----------
From: Gary Pewitt <garypewitt at centurytel.net>
To: WA5CAB at cs.com
Cc: milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] Painting Aluminum - BC-348 in particular
Date: Fri, 14 May 2010 22:14:43 -0500

The zinc chromite is a dip process and the color varies widely depending
on the material, the strength and age of the dip, and how long it is
immersed.  I was a government QAR at Williams Int where they made the
cruise missile engines and the process was used extensively on aluminum
parts.  The color isn't important just the protection of the base material.
73  Gary



On 5/14/2010 11:39 AM, WA5CAB at cs.com wrote:
> Does anyone know offhand what the difference between green and yellow is?
> The website nerd sent earlier didn't say (and they were out of green).
>
> In a message dated 5/14/2010 11:35:26 AM Central Daylight Time,
> hankarn at pacbell.net writes:
>
>> Zinc chromate is a primer/binder in green or yellow and is applied in a
>> light non cover coat.
>>
>> Hank
>> KN6DI
>>
> Robert Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
> ______________________________________________________________
> Milsurplus mailing list
> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Milsurplus at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>
>

______________________________________________________________
Milsurplus mailing list
Home: http://mailman.qth.net/mailman/listinfo/milsurplus
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Milsurplus at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html


____________________________________________________________
Penny Stock Jumping 2000%
Sign up to the #1 voted penny stock newsletter for free today!
http://thirdpartyoffers.juno.com/TGL3131/4bef3e4bf2c6a4c14f5st04duc
______________________________________________________________
Milsurplus mailing list
Home: http://mailman.qth.net/mailman/listinfo/milsurplus
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Milsurplus at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html