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topic 60727

Chromate Conversion Coating Post Packaging

April 3, 2018

Packaging Materials
from Abe Books


Q. Thank You to all the contributors.

I have searched the site looking for a reference to what is the correct way to post handle or ship chromate conversion coated aluminum parts.

When you look at:

ASTM B449-93 [link by ed. to spec at TechStreet] (2010) Standard Specification for Chromates on Aluminum

- 7.0 Coating Requirements
- 7.1 General - Chromate conversion coatings harden with age by gradual dehydration. They should, therefore, be handled
carefully for the first 24 h after treatment, and any tests (including corrosion tests) shall be deferred until the expirationof that period.

There is no reference to packaging.

Do we package chromated parts in plastic bags?
Do we wrap in acid free paper?
Do we wrap in newspaper?

I am curious on the answer and I believe I know the answer but there is no information jumping out of the web search.


Kurt Krueger
- Lexington, Massachusetts

April 9, 2018

A. Hi Kurt,
Once you've given them time to set up for 24 hr or so, either plastic or newsprint paper are totally acceptable. Acid free paper would be lovely, but IMHO it's overkill. Obviously you don't want newsprint with ink on it (save it for your fish n chips lol).
We even wrap our Salt Spray specimens in newsprint for shipping, after a 24 hr holding period, and everything is just ducky.

Rachel Mackintosh
Plating Solutions Control Specialist / Industrial Metals Waste Treatment - Brattleboro, Vermont

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