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  #1  
Old 05-08-2019, 06:40 AM
GPV GPV is online now
 
Join Date: Apr 2019
Location: QLD, Australia
Posts: 34
Default Zinc Phosphate Primers

Does anyone know how effective zinc phosphate is for preventing aluminium corrosion? I'm trying to find some hard data but there isn't much out there! Not sure it's as effective as it is for steel.

Consequently, any thoughts on whether a 2 part zinc phosphate based epoxy primer with "good" adhesion would be preferable to a zinc-free 2 part epoxy primer with "excellent" adhesion? This is for internal surfaces of course.

If the zinc phosphate is of marginal benefit I would prefer the one least likely to scratch or chip aka option B.

Any advice would be appreciated!

Greg
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  #2  
Old 05-08-2019, 06:50 AM
BillL BillL is offline
 
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Location: Central IL
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Sorry you will have to search, but I posted some links to test reports on primers does by the USA DoD. There was a get from Georgia that added a link to a more recent one too. Sorry you will have to search, I can not remember them, but just know they are posted here.
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  #3  
Old 05-09-2019, 03:11 AM
GPV GPV is online now
 
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Thanks Bill, I'll dig the post up!
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  #4  
Old 05-15-2019, 01:46 PM
Sue Sue is offline
 
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Default Primers

Heard of zinc cromate, not phosphate?
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  #5  
Old 05-19-2019, 02:19 AM
GPV GPV is online now
 
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Quote:
Originally Posted by Sue View Post
Heard of zinc cromate, not phosphate?
https://www.aircraftspruce.com/catalog/cspages/zinc.php
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  #6  
Old 05-19-2019, 03:41 AM
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rmartingt rmartingt is offline
 
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Quote:
Originally Posted by Sue View Post
Heard of zinc cromate, not phosphate?
There's a big push to get rid of chromates due to health and environmental concerns (hexavalent chromium is a nasty carcinogen).
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