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Zinc vs Aluminum Spot Test

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swall

Materials
Joined
Sep 30, 2003
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I'm wondering if anyone knew of a chemical spot test to distinguish zinc vs aluminum (coatings,die castings, etc.) I'm thinking maybe a 30% nitric acid dip--aluminum would be unfazed, but the zinc would be rapidly dissoved?
 
Please note that a special coating called Galvalume, covered by ASTM A792, indicates a material for dip coating made of 55%Al-45%Zn.
I recommend X-Ray fluorescence as the best nondestructive instant test for positively identifying most of metals.
Many labs and facilities (even junk yards) can offer this test at nominal cost.

 
I knew you'd say that!
 
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