Originally Posted by evil dave(WERA forum)

Well, the plot thickens...

Mr. Sunshine brought over two plates. One green. One black.

We calibrated the measuring device on raw aluminum.

We checked the thickness on the black part. It read over 1 mil.

We checked the green part, fully expecting to read 2 to 3 mils.

The green part read slightly over 1.5 mils of coating.

I had one of our most experienced guys in the shop look at the part. The plating shop manager. He has been at this for over 30 years. He looked at the two parts and I informed him of the strange readings, not at all what we expected.

This is what he said:
He believes the black part is regular sulfuric acid anodized. What you would find on any aluminum part that is for decoration purposes only. The green part appears to have hard anodoze. He disagreed with me on the seal, in his opinion (which is better than mine) is that it is probably dyed that color and getting a different seal. (There are several different seals for different purposes.)
If the green part is in fact hard anodized than it would explain why there is less wear on the contact surfaces. (we checked film thicknesses on different surfaces on the part and found it was slightly thinner on the surface that gets wear).
He continued to say that certainly if the black part was regular anodized it would not offer any protection beyond corrosion protection. Hard ano goes "half in and half out" or better "penetrates" the surface of the aluminum.

Remember, the duc parts get ceramic coating (due to dry clutch). So I still stand behind my belief that the black parts are standard anodize and the green ones are hard anodize, but maybe a different seal (which would make no difference as far as the wear surface is concerned).


So, the bottom line is this....

We can strip and reanodize the plates for whoever wants to be test lab mice and report back the results to this board.

I have no real gain or loss here. Personally I am only:

1. Trying to help out a close friend (Mr Sunshine)
2. Am personally intersted only because my hobby (racing motorcycles) and my job (powder coating/ plating) are intersecting.

Hope this additional information helps.
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evil_dave
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Originally Posted by SV650Racer (Post 2083487)

Nothing at all to do with the anodising.

Originally Posted by squirrel_hunter (Post 2083750)

Are we saying that there is a problem with Sigma Slipper Clutches, but only the newer ones?

If someone would for example have one in their garage that they bought second hand, how would they know if their clutch is effected by this problem other than running it to destruction?