Technical Tips > Body Parts - Bodywork - Paint

Phosphoric Acid

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StephenSLR:

--- Quote from: Vettech on October 29, 2015, 10:30:54 PM ---In the good old days people used "fush oil", sorry I mean "fish oil", this is Aus. where we speak the Queens English. Stinks like hell, but maybe they have stuff today that is sanitised.
--- End quote ---

They use cavity wax these days.

s

Vettech:
Rust is complicated Bfit, be it Fe (OH)3 or FeO(OH) or Fe2O3.H2O  but it boils down to bear steel, water and some spare oxygen, rust can happen any time, since normal air will have dissolved water molecules in it. If any one figures out how to stop it they will be either shot dead the next day or be multi multi millionaire.

Vettech:
Cavity wax !?.... ummm I wonder.

Matt G:
More good tips guys.  Good Link Steve.  There was a good comment that indicated that the zinc would work regardless of the emersion.  My understanding of the emersion is that it helps the flow of current (salt bridge), but provided you have a good contact, the solution is not required.  Back when I did my Eng (Mech also Steve), I thought of doing the pulse current idea (without the need for a sacrificial), however a guy in the link indicated that on a car chassis (because it's relatively thin), you would need a whopping big current for it to practically work.  probably not a good idea on a car that depends so heavily on its chassis for earth....

Sounds like there's no sure solution, except to coat the crap out of it and hope that you've sealed out all moisture and all air. you know that even if I do a totally awesome job at coating the inside, and at completely sealing off any chance of internal corrosion, that I'll probably just set up another part of my Chassis, or steering, or diff, or something else to corrode - now that my chassis isn't the more exposed sacrificial part....  Even worse, I'll probably set up a beautiful little crevice corrosion environment, and I'll rapidly rust through somewhere hidden and completely unexpected!!

Then again, Like Bfit said, 40 years gone...  Probably nothing to worry about and another 40 years will fly by without any signs of anything serious.  I'm probably just being over pre-cautious!
Thanks again, I'll let you know how I go.
Cheers

Matt

StephenSLR:

--- Quote from: Vettech on October 30, 2015, 08:29:42 PM ---Rust is complicated Bfit, be it Fe (OH)3 or FeO(OH) or Fe2O3.H2O  but it boils down to bare steel, water and some spare oxygen
--- End quote ---

... and it happens at the interface between water and air, not underneath the water.  i.e. when the door drain holes would block up and the door fills with water; you would notice the rust occurring up higher, right on the water line; the submerged area would be relatively rust free.

s

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