Hard Anodising
Hard Anodising
(OP)
I have a 7075 thread that has been hard anodised instead of sulphuric anodised and I have to determine the effect on fatigue life. Anyone know where I can get data on comparable fatigue life after hard anodising?





RE: Hard Anodising
thread338-138745
thread330-152013
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RE: Hard Anodising
With hard-anodizing and the stress-concentration of a thread form (see Peterson), I would expect cracking immediatly upon preloading.
The sulphuric acid process itself does not guarantee an improvement; it's the boiling-water sealing step that forms a relatively amorphous emulsion which should be more crack-resistant.
?why anodizing? there are many other more historical protective processes, including MIL 5541 (Alodine) and wet installation with epoxy primer.
I've never seen any actual data on any of the above.