Anyone else every noticed rust on the heater cap of their Bohm engines?
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Scorched steel makes it easier to oxidize ..... and you live right near the ocean in a salt air environment.
Even here in the high and dry of the intermountain desert I find a thin layer of fine rust on the heat caps of some of my Solar Engines and PM Research Stirling Cycle Engines!
Scorched steel makes it easier to oxidize ..... and you live right near the ocean in a salt air environment.
Even here in the high and dry of the intermountain desert I find a thin layer of fine rust on the heat caps of some of my Solar Engines and PM Research Stirling Cycle Engines!
My PMR's all will get some surface rust if I don't oil the end caps after running them, but they are carbon steel.
The Bohm end cap is stainless, I've seen a slight rust stain even on 316 stainless in marine settings, but that's a fair bit of rust on that end cap.
I just sent an email to Bohm with the photos, be interested (if they ever answer me) to see what they say.
Didn't know that Bohm's heat caps were Stainless. But there is Stainless and there is Stain Less, depending on the alloy used. Check it with a magnet, as I know for marine rigging, Stainless wire-rope that will attract a magnet is considered to be very inferior at corrosion resistance!
Didn't know that Bohm's heat caps were Stainless. But there is Stainless and there is Stain Less, depending on the alloy used. Check it with a magnet, as I know for marine rigging, Stainless wire-rope that will attract a magnet is considered to be very inferior at corrosion resistance!
A magnet is not interested in it.
The oldest Bohm I have is about 28 yo, no rust. I use 95% alcohol in the burner. Possible cause might be if a higher water content in the fuel combined with the heat would aid in forming rust.
Bohm got back to me -
Hello,
we use 1.4305 Stainlesssteel,
Chemical X10CrNiS18-9,
Corrosion resistance Medium
Not resistant to intergranular corrosion