Originally Posted By: rooflessVW
Originally Posted By: ArcticDriver
There appears to be two different conversations going on.
The OP asked specifically about aluminum threads and many of the responses have discussed aesthetic issues on aluminum surfaces.
Can someone please tell me how these various degreasers destroy aluminum bolts or threading? Do they cause oxidation? Do they cause brittleness?
I have used Brakleen and PB Blaster for decades on aluminum bolts with no apparent ill effect. I have never later had one of these bolts snap off or show any other signs of fatigue. I would like to know how degreasers destroy an aluminum bolt.
Acids? Yes.
Degreasers? Please explain.
Thanks
What do you think streaking or oxidation on aluminum is? It is corrosion. Normally it stops by itself - the oxidized layer acts like a barrier.
Most degreasers are heavy alkaline solutions and will continue to corrode aluminum. Think Simple Green, Purple Power, Grez-off, etc.
Brakleen and PB Blaster are solvent degreasers, PB Blaster has oil in it as well. Much safer for aluminum, and not what came to mind when I posted.
Yes, its corrosion. So you are saying that the threads on the aluminum bolts will corrode right off?
The alkaline degreasers that you mention...how do you stop them from causing corrosion? Rinse them thoroughly with water?
I guess I never considered that someone would not rinse a bolt in water after it was soaked in a Simple Green or purple Power. I used PP once and found it left a noticeable film of the surface of the material I was degreasing even after I rinsed it. That is why I stick with Brakleen. It evaporates quickly and displaces water.
To the OP...I will include a disclaimer that i did not think was necessary. If you are going to use a degreaser such as SG or PP, then don't leave the bolts in there for several months and do be sure to thoroughly rinse the bolt in water when finished.