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"Plating to resist anhydrous ammonia?"

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Current question:

December 25, 2021 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. We are manufacturer of anhydrous ammonia valve, we need some advise for coating on anhydrous ammonia valve which can last minimum one year. Save its outer and inner body from Rust.

Asghar Shahid Ali
- LAHORE Punjab

"Electroless Plating"
by Mallory & Hajdu
from Abe Books

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December 2021

A. Hi Asghar. As you'll read below, nickel should be good, and electroless nickel should be practical to apply. But it has to be thick enough to be non-porous and free of pinholes. Remember that a thickness adequate for small polished valves will probably be inadequate for large rough castings. 0.0005" might be generous for the former but would be insufficient for the latter.

Luck & Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey

Closely related Q&A's, oldest first:

"Accident Prevention and Response Manual for Anhydrous Ammonia Refrigeration System Operators"
by U.S. EPA
from Abe Books

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Q. I am looking for a plating on steel parts that would resist moist anhydrous ammonia. The parts are for the oil system on a compressor for an anhydrous ammonia tank. Stainless steel is not preferred and plain steel will rust, although both resist the ammonia. I would like to use electroless nickel plating on the steel parts, but do not know if it will resist the ammonia.

Dan McGill
- London, Ontario, Canada


A. The issue here isn't the ammonia, it is the ammonium hydroxide which forms when you add water to ammonia (or vice versa). Nickel resists alkalies well and as long as there are no pinholes in the plating, nickel is suitable for this application.

Dale Woika
Surface Conversion Sciences - Bellefonte, Pennsylvania, USA

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