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ANTI-GALLING COATING

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Q. I AM LOOKING FOR A COATING TO USE ON A VARIETY OF THREADED STAINLESS STEEL PARTS TO PREVENT GALLING. THE PARTS ARE DISASSEMBLED/REASSEMBLED IN THE FIELD ON A REGULAR BASIS FOR REBUILDING AND CLEANING. CAN YOU SUGGEST A COATING OR PLATING THAT WE CAN HAVE APPLIED TO PREVENT THIS FROM HAPPENING?

MIKE RUFENACHT
GRACO - MINNEAPOLIS, Minnesota


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A. Teer Coatings in England has a graphite-based PVD coating that might fit the bill. I think they market it in the U.S. through Multi-Arc.

treglio portrait Jim Treglio
American Faucet &
  Coatings Corporation


Vista, California



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A. One of your best options is Electroless Nickel. It prevents galling, you could also use ENi with Teflon so that assembly/disassembly will be easier to perform.

Enrique Segovia
- Monterrey, N.L.


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A. Silver is the standard non-galling coating for the vacuum technology business. Silver coated bolts are standard items.

Donald M. Mattox
Society of Vacuum Coaters
Albuquerque, New Mexico
 
Ed. note:
            Mr. Mattox is
            the author of --



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A. I used to use a chromium plating called ARMOLOY NTDC where I worked previously. Armoloy is an American company (Philadelphia I think). The coating is extremely hard, (about 70HRC / 1100HV), satin in appearance, and works wonders. In our experience it adhered and lasted much better than either Nickel or Silver. We used it for Nuclear applications mainly, where exfoliation of Nickel had been a problem.

Wayne Ward
- England


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A. Carpenter Steel makes an austenitic stainless steel called 'Gall Tough' which works well. There is a competitors product called 'Nitronic 60'

Steve Cassidy
- Hudson, Massachusetts


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A. If silver plating is not used, there are lots of different dry film lubricants, which are affordable solutions, particularly the ones that come in a spray can and do not have to be baked. They are not as good as baked, but would work fine for a touch up.

James Watts
- Navarre, Florida


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A. Mike - Another anti-gall coating is manganese phosphate. It also holds an RP [rust preventative] oil very well for corrosion protection. The production process is similar to zinc phosphate. Ask your chemical vendor for info.

Dan Brewer
chemical process supplier - Gurnee, Illinois


February 10, 2010

A. We provide and train customers for Anti-galling copper plating on all types of premium and non-premium box or pin connections on tree-tops, tubing hangers, top/bottom subs, cross-overs, blast-jints test caps, drill collars, etc.

Major licensors uses this process for Anti-galling reasons.

Sunny Tan
- Singapore


June 4, 2014

A. RIE Coatings supplies coating #1713, often topcoated with #4606 for SS fasteners

Chad D. Petersen
- Jackson, Minnesota, USA

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Ed. note: Gentle readers, this is a service for technical information and camaraderie, and is made possible by advertisers whose support will certainly evaporate if the forum is used not for those purposes, but to steer potential customers away from them and towards vendors who don't even help support the site. Therefore, please try to answer as technically and generically as the situation permits, avoiding brand names and sources to the degree possible.



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Q. I NEED TO CROSS REFERENCE THE SPEC BELOW; PLEASE HELP: ANTI- GALLING COMPOUND PER PWA-36545-1

Laszlo Kocsis
- Tullytown, Pennsylvania



A. Hi Laszlo. I can tell you that PWA stands for Pratt & Whitney Aircraft division, but not much more.

Regards,

pic of Ted Mooney Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey

July 1, 2014

A. Go to the Everlube Products website and they produce a product that conforms to PWA 36545. It is either Everlube 620C or Esnalube 382, I don't remember which one it is. The site also has information on application of product and MSDS.

Scott Canning
aerospace engineer - Laconia, New Hampshire

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