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topic 59449

Best plating for high temperature Exhaust Manifold Plate on mining equipment

October 31, 2013

Q. Hi,
An exhaust manifold plate on the side of our machines engine is corroding quite badly due to harsh mining conditions. The exhaust manifold gases can reach up to about 600 °C. The surface temp of this plate regularly gets to 150 °C, and so hotter internally. I have been looking at options for plating, namely electroless nickel plating and zinc-nickel plating. The surface finish of the plate is to be maintained. What plating would you recommend for this application, in particular the heat resistance of the plating? I can't seem to find much info about the maximum temps these platings can handle.


Jack Stewart
employee - Perth

October 31, 2013

A. Hi Jack. Although, 150°C is not really hot, it's possible that zinc alloys won't be satisfactory on the hottest spots. For very high temperatures, you'll probably want electrolytic nickel plating.

But ceramic coating rather than plating may be a better answer.


Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey

November 2, 2013

Q. Thanks for the reply Ted. Does the process of ceramic coating subject the part to high temperatures? As it is quite a critical component of the machine and do not want its internal structure changed during the process? Thanks

Jack Stewart
- Perth, Washington

November 6, 2013

A. Yes, the application of ceramic coatings involves very high temperatures to melt the frit onto the component. If your part cannot tolerate those temperatures, electroless nickel plating should work.

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey

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