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....not heat being absorbed....
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I read the Nickel as a reflective catalyst.
Compare with ceramic coating, or Nickasil.
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https://en.wikipedia.org › wiki › Nikasil
Nikasil - Wikipedia
Nikasil is short for Nickel Silicon Carbide. Silicon carbide is a very hard ceramic (much harder than steel) that can be dissolved in nickel. The nickel solution can then be electroplated onto the aluminium cylinder bore. The piston rings will then rub off the exposed nickel, leaving a very hard layer of silicon carbide to prevent the cast iron ...
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Porsche use the stuff.
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https://lnengineering.com › products › porsche-and-vw-aircooled-cylinders-and-pistons.html
Nickies™ Billet Aluminum Performance Aircooled Porsche Piston and ...
Nickies have up to 50% greater tensile and ultimate yield strength than OEM Porsche cast aluminum cylinders Nickies are stronger and more ductile than any cast iron, ductile iron, or aluminum OEM or aftermarket cylinders Nickies allow for larger slip-fit and machine-in sizes than previously available with cast iron or aluminum cylinders
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But that's the cylinder not the piston?
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https://auto.jepistons.com › blog › what-is-electroless-nickel-coating-for-pistons
What is Electroless Nickel Coating for Pistons?
Rather, the coating is deposited onto the piston surface by using chemicals like sodium hypophosphite or boron hydrate to reduce the nickel ions to metallic nickel. When properly applied, the coating—which is 25 to 100 microns thick—is uniform, increases the metal's hardness and is resistant to corrosion.
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