In re: exfoliation corrosion
This type of corrosion is a severe problem only with extrusions (such as the
hinges) in certain alloys (2024 and 7075 in particular, but even for these
alloys special metallurgical treatments can mitigate the problem) and then
only in marine environments where it does indeed happen "real quick when
you're not looking" but I suspect that the hinges are 6061 which is not
susceptible to exfoliation.
Best regards,
Rob Housman
A070
-----Original Message-----
Behalf Of Alexander P. de C. Kaarsberg
Subject: Re: rudder core
My premade rudder has a nice little dent in it that i now know the
reason for, thanks! If you'd like a picture of it, I will send it to you.
I am rubbing my hinges down and treating them as I have bad experience
with extruded alu parts- exfoliation corrosion hits real quick when
you're not looking. The hinges appear to be anodized but then they get
cut and rubbed down at least on the bonding surface...
Alex XS # 529
Stephen Dunn wrote:
> Just started shaping the rudder core and I read somewhere that there
> is a problem with the leading edge tip hitting the fin when the rudder
> is deflected to the left. Is this a problem, and if so is it something
> I can address at this stage? The manual isn't very specific about the
> shape of the tip. Also, do the hinges need to be treated before being
> bonded to the rudder? Thanks,
> Steve
>
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