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Corrosion Protection/Zinc chromate

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paul(at)eucleides.com
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Posted: Sun Oct 26, 2008 8:05 pm Post subject: Corrosion Protection/Zinc chromate

On Sun, October 26, 2008 5:54 am, Noel Loveys wrote:

Clip clip



 	  Quote: 	
		   has to be able to have a strong bond with the spars.  This means a two part

 epoxy is required because it is not dissolved by the fabric adhesive.  Zinc

 chromate will actually protect the aluminium at a molecular level.  Apply it

 sparingly and be sure to wear rubber gloves when working with any zinc

 chromate.


	


Noel, Have you been successful obtaining Zinc Chromate based paint or primer in the

last few years?



I ran out and went searching for some and paint brands such as DeRusto and Rustoleum

made no claim of containing it (they used to) so I took the extra effort to get the

MSDS for each of the products that claimed corrosion protection and of the 5 I looked

up, two had zinc phosphate but none had Zinc Chromate in them. I haven't researched

this but it is likely that somebody found that it was detrimental to the quality of

life of laboratory mice or was a runner up in the global warming debacle.



An A&P friend of mine gave me 2 quarts of "Boeing Green" as he called it that were at

least 15 years old. I put the two cans in a Lowes paint shaker for 8 minutes and have

been using it.



I wonder if these new blends with zinc phosphate will work as well. Certainly seems

like some research into this could be useful.



clip clip clip



-- 

Paul A. Franz, P.E.

PAF Consulting Engineers

Office 425.440.9505

Cell 425.241.1618

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lcfitt(at)sbcglobal.net
Guest

Posted: Mon Oct 27, 2008 6:11 am Post subject: Corrosion Protection/Zinc chromate

Paul,



In reading these pages in ACS, I had always assumed that the Zinc Chromate 

primer offered was a solvent based primer as it is available in spray cans 

and the Epoxy primer was of a different formulation for it's corrosion 

resistance.



Lowell



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lcfitt(at)sbcglobal.net
Guest

Posted: Mon Oct 27, 2008 6:16 am Post subject: Corrosion Protection/Zinc chromate

There is an interesting discussion group that google found with some 

questions and responses that are pertinent to this question.  They call it 

the "Home Page of the Finishing Industry.  Go to:



http://www.finishing.com/0600-0799/702.shtml



Lowell

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Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Mon Oct 27, 2008 1:24 pm Post subject: Corrosion Protection/Zinc chromate

The last time I saw two part epoxy zinc chromate was a while ago...  I would

try one of the suppliers for certified aircraft.  Aviall, Wicks and Leavens

in Canada come to mind.



Noel



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Noel Loveys
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paul(at)eucleides.com
Guest

Posted: Mon Oct 27, 2008 2:47 pm Post subject: Corrosion Protection/Zinc chromate

On Mon, October 27, 2008 6:05 am, Lowell Fitt wrote:

 	  Quote: 	
		   



 Paul,



 In reading these pages in ACS, I had always assumed that the Zinc Chromate

 primer offered was a solvent based primer as it is available in spray cans

 and the Epoxy primer was of a different formulation for it's corrosion

 resistance.


	


You have a lot more expertise than I do, but I think that if you're going to paint

over the primer, in some circumstances the Zinc Chromate would be better for one thing

it is flat and has a better tooth. The solvent base must be considered for the type of

stuff you're going to apply to it. I'd sure check with PolyFiber if that's going on

over it. I'm pretty certain that the Epoxy you speak of is compatible with Poly Fiber,

but not being certain, I'd check with them first before buying.



After doing some research, it turns out Boeing has adopted a new anti-corrosion paint

that has less environmental risk. I found the part number for it, but not the content

yet. Found one reference that said it was pricey in small quantities.

[quote]

 Lowell



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Float Flyr

Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

Posted: Mon Oct 27, 2008 2:54 pm Post subject: Corrosion Protection/Zinc chromate

Now that's a great find Lowell.  Thanks i have it bookmarked now.



Noel



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