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topic 40706

Type of coating that may be used to REPAIR ground Mil-C5541surface of an Aluminum part


We have a part that was Mil-C-5541 treated and unfortunately a part of it has been grounded /sanded so that Aluminum is now exposed. Is there any process or other coating that one may recommend that would be in lieu of 5541...short of using a new part or re-treating it again to 5541..?

Thank you..

Mehmet Evizi
- San Diego, California, USA

First of three simultaneous responses -- 2006

Your firm used to have a "touch up" in the standard practice manual.

James Watts
- Navarre, Florida

Second of three simultaneous responses -- 2006

Mil-C-5541 allows swabbing on of chemical, there are directions available from the manufacturers of the chemicals and in archived letters on this site describing how that can be done. While some of the chemicals are hazardous, standard care and caution makes it a relatively safe and easy process.

Good luck!

Jim Gorsich
Accurate Anodizing Inc.
supporting advertiser
Compton, California, USA
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Third of three simultaneous responses -- 2006

Abrade the bare surface with ScotchBrite, using a cotton swab, dip in a solution of double strength chromate, then wipe back and forth until the spot attains the same color as the surrounding dipped chromate, then wipe off with a damp tissue.

robert probert
Robert H Probert
Robert H Probert Technical Services
supporting advertiser
Garner, North Carolina
Editor's note: Mr. Probert is the author of Aluminum How-To / Aluminio El Como
and co-author of The Sulfamate Nickel How-To Guide

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