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June 2015

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From:
"Stadem, Richard D." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Stadem, Richard D.
Date:
Wed, 3 Jun 2015 18:50:44 +0000
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Zinc oxides produce a white powder color. Here is an example; http://en.wikipedia.org/wiki/Zinc_oxide
Chromium oxides produce a light green tint, but it can depend on the finish used; it can turn yellow or brown depending on the temperature. http://en.wikipedia.org/wiki/Chromium(III)_oxide

Reddish orange to deep red for iron, of course. Here are some examples: http://chromeoxide.com.cn/product7.html

Copper does not always react with blue-green or white verdigris from acetate or acid byproducts in flux or minerals in water; the byproduct can be other colors if purely from oxygen exposure, but it is usually brown if it is "regular" copper simply exposed to oxygen over time. Think of a 1931 penny. That changes drastically if the copper has some small amounts of beryllium or brass, even trace amounts can produce a completely different color oxide.
http://en.wikipedia.org/wiki/Verdigris

For any of the above base metals, the color of the oxidation depends on what else is in there.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
Sent: Tuesday, June 02, 2015 2:04 PM
To: [log in to unmask]
Subject: [TN] oxidation/corrosion attack

Fellow TechNetters:

   When copper is attack and forms oxidation/corrosion it give off a bluish/greenish tint.   What colors would be expected if the base alloy was Fe/Zn coated with a Chromeate coating?

Victor,


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