Quote:
Originally Posted by barrrf
Hi Tobin, I highlighted part of your post. Im curious why?
Im going to disagree with the use of stainless as a spacer due to galvanic corrosion concerns (when using aluminum wheels). I personally would use aluminum for all your spacer/adapter needs.
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Good point, galvanic corrosion is a valid concern. For those not aware of the materials science behind galvanic corrosion, you need three things for it to take place:
1. Two metals with different corrosion potentials, which 304/316 SS and aluminum would qualify. These relative potentials can be found on cathodic/anodic material charts.
2. Direct metal to metal contact, which we would have.
3. And an electrolyte between said surfaces, aka water, which will vary depending on location, humidity, etc.
In a dry environment or on a garaged application, I don't think you'd have any issues with a 300-series stainless. That said, I would prefer to use similar materials, however cutting an 1/8" thick aluminum disc flat and parallel from bar stock is easier said than done. I've found one option in 6061-T6 aluminum through Summit
here that might be a good option, although I prefer to maintain hubcentricity on the spacer myself, which that one does not appear to do.
If I were making them, mild steel is certainly cheaper in that thickness range and can be zinc plated (dichromate or galvanized), which would be very close to aluminum with respect to corrosion potentials thereby minimizing the potential for galvanic corrosion.
Tobin
KORE3