Originally posted by buffsldr
None of this is really on point, I just get frustrated when peeps throw down statements without evidence or sources. Do you have an references for your conclusions?
Admittedly you're sending me back (depressingly far back) to my college years (I
did start off in Mechanical/Aerospace Engineering) and making me do some research (mostly in how carbon fiber plastics can take part in corrosion reactions), but because I've got the TiBook
right here I still don't think that's what is happening. The corrosion seems to be on the paint surface, rather than bleeding up from beneath as it would in filiform corrosion. Not to say it necessarily doesn't happen, but I have not been able to locate any references to filiform corrosion occuring on a coated CF surface the way it can on painted metal surfaces. What I've found has focused more on the problems with carbon fiber plastics accelerating corrosion in metal components in contact. The titanium doesn't seem to be involved, both because there is no titanium
in the area in question, and because titanium does not seem to have any common reactions at roughly room temperature whose products are green.
Of course paint is frequently used for protection of corrosion-prone surfaces, but I'm pretty sure the lighter-colored paint on the TiBook is cosmetic in nature (this is an Apple product, after all), and I still believe, from what I've seen, that it is the paint itself (a component of the paint, rather) which is reacting. The fact that it happens only on a specific lot of them suggests to me possibly a bad run of paint.
The main thing I'm still curious about is why it seems to happen around the DVD slot more than other parts. I wouldn't suspect oils from fingers because the area around the latch release button (which arguably has much more contact with my fingers than the DVD slot) exhibits no discoloration.
I didnt realise what a problem it was on the old TiBooks.
