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Hi everyone, Once again thaks for all the input. I'l echo a point i made earlier on in that this has been an interesting topic research. If anyone is interested, see my final case study WWW.HIBTECH.COM then FERRARI 456 ABS part 2.

Thanks for the input Cory. Its been an interesting subject to research. What profession are you in?

Hi guys again, Going back to my original problem layed out at the start, would GROUNDING the "wheel hub"/"steel backing plate" assembly to chassis potential disipate all electrical potential held within the different metals?

in my early days, ive always been told not drill into an aluminium chassis and insert a steel screw - and in places where water cant reach. Maybe an electrolyte merely accelerates the corrosion.

I see your point. in my case, driving water spray was the electrolyte then?

Hi guys, i'm left thinking that two dissimilar metals joined would coorode on their own without an electrolyte, and that having an electrolyte (water)would accelerate the corrosion.

Hi all, thanks very much for the input. I've got a lot to work with. regards nick93

Will try a google search for it. I'm convinced "galvanic corrosion" is what i'm dealing with here. But it strikes me odd that a car manufacturer has taken no preventitive measures ?!?! What finish would you suggest using?

Thanks EWH I dont believe either surface had any kind of a finish on it. The corrosion - is it due to differences in electrcical properties of the two dis-similar materials you think?

Hi, Should bolting a steel plate to an aluminium surface cause corrosion problems? I recently had an ABS problem on a car and traced the fault to the gap between the sensor and the wheel rotor. The gap had increased due to corrosion build up. The sensor is mounted onto a steel plate at the...