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Metal finishing Q&As since 1989

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Electroless nickel plating

What would replace this process on a part that is made up of cast alum. 356t-6 and has a service temperature of 1500-1800 degrees?

Greg Samson
research - Chicago, Illinois, USA
2005

Greg, stop and take a look at your question. What is the purpose of the EN on your part. What do you want the new coating to do? Aluminum that has gone to 1800 (I assume F) will have squat for strength, so what is the part supposed to do-IE: what is it used for?

James Watts
- Navarre, Florida
2005

2005

Greg,

Aluminum that goes up to 1800 degrees, whatever the scale, would be in liquid form. It's melting point is 660 °C/

1220oF/933oK/1711oR (I had forgotten about that last one Rankine).

Anyway, strength (and shape) by definition, will be zero. It absolutely has to have some way of cooling, a heat barrier or both if exposed to such a hot environment. Maybe a ceramic coating is what you are looking for, definitely not electroless nickel. It can be applied by several processes. Plasma spraying comes to mind due to its thickness and adhesion.

Guillermo Marrufo
Monterrey, NL, Mexico

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