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  #21  
Old 09-09-2018, 12:01 AM
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Nedimbek Nedimbek is offline
 
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I sure missed that last sentence he wrote on post #10.

On the other hand alodining those small parts may not protect them for corrosion either if those surfaces are subject to wear. It will actually provide less protection than a well applied good quality scratch proof primer. Alodine is not scratch proof and it is very thin.
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  #22  
Old 09-09-2018, 12:07 AM
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Quote:
Originally Posted by rv7charlie View Post

Ken,

I'm far from qualified to give you a technical explanation, so I didn't try. But I am aware of the risk, so just wanted to make you aware. IIRC, there was an article published by Van's years ago that gave a layman's description. Apparently an engineer can estimate the number of cycles to fatigue failure in un-anodized aluminum (all aluminum has a fatigue life), and also estimate the reduction in cycles due to anodizing. Again, IIRC, the article said that the estimated cycles to failure of the anodized spar was high enough that there was little chance of reaching that number in a typical RV's lifetime. My point was that we don't know the fatigue life of other structural components if they get anodized.

Hopefully, a qualified structures guy will jump in with a better explanation.
Good point!
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  #23  
Old 09-09-2018, 12:49 AM
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Quote:
Originally Posted by Aluminum View Post
spray the surface with simple green (has phosphoric acid)
It does? Are you sure?
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  #24  
Old 09-09-2018, 12:58 PM
Aluminum Aluminum is offline
 
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Quote:
Originally Posted by scsmith View Post
It does? Are you sure?
Ha, good catch. The consumer version did in 2012, but the 2018 MSDS says they replaced it with citric acid. The aviation version still does contain a small amount of phosphate as of 2017.

I suppose one solution would be to add phosphate directly to your favorite degreaser.
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