Dummy up question...

miller · Apr 14, 2016

Yeah, been looking for answers, look some more.

Question is what my options are for 'white rust' on my 727 housing. Just starting to build a light coating, pretty much the entire case.

Have had the trans built, setting on shop floor for a few years, all okay. Now, trans is in the car for awhile...this blasted corrosion starting to form. Seems to easily wipe off. Anything I can rub (lol), on the case to stop the corrosion?

Glenwood · Apr 14, 2016

I'm thinking a clear coat sealant would seal it against oxygen exposure.

miller · Apr 14, 2016

Thanks, Glenwood. Thinking the same thing, but...should have done that before bolting it up. Or, paint the dang thing...too late for that, too.

Might look for some alodine, or the like, but want to get the white stuff off first. Bad deal was this trans sat outside in the dirt/mud for 2 years, before I tripped over it. Beautiful inside! Just had to scrape mud and such off the outside, cleaned it, and a couple rounds of aluminum brighter. First trans I've ever had this problem with.

Read vinegar might help?

Glenwood · Apr 14, 2016

For wiring, I've just used a good stainless wire brush then coated it with NOALOX. Doesn't apply to your tranny but here's some comments on another forum I read that might help.

Heavy corrosion on aluminum can be removed mechanically such as by bead blasting, abrasive brushing, and/or sanding but to be stopped it has to be treated chemically. There are many products available, most containing phosphoric acid. With over 45 years of experience in the aircraft industry one of the best and easily obtained products I've found is a #33 Alumiprep. This is a brush-on chemical that you dilute with water. It cleans and brightens aluminum while stopping the corrosion process. This should be followed up with a product such as 1001 Alodine which is a brush-on chemical that conditions the aluminum for a clear finish and corrosion resistance. These products can be found at automotive paint suppliers or ordered online from Aircraft Spruce, 877-477-7823, http://www.aircraftspruce.com or Chief Aircraft, 800-447-3408, http://www.chiefaircraft.com, plus others. Make sure you order Alodine 1001 and not 1201 as 1201 will discolor aluminum unless you are going to prime and paint it. Don't use the above on magnesium!

One of the worst things you can do with aluminum is to use a steel wire brush, steel wool, emory cloth, and or copper alloy brushes. You can use aluminum grit and
silicon carbide abrasives, aluminum-oxide-impregnated nylon abrasive wheels, aluminum wool, and fiber brushes. Stainless steel brushes with the bristles not exceeding 0.010 inch in diameter can be used followed up with 60 grit aluminum oxide paper, 120 grit aluminum oxide paper, and finished up with 400 grit aluminum oxide paper. Follow this up the chemical conversion process semi explained above.

If all you have is light surface corrosion I'd use the #33 Alumiprep followed up with 1001 Alodine.

miller · Apr 15, 2016

Perfect! Thanks a bunch for that, Glenwood!

I'll get both the #33 Alumiprep, and 1001 Alodine, and put 'em to work.

Dreamcatcher · Apr 15, 2016

Glenwood said:
For wiring, I've just used a good stainless wire brush then coated it with NOALOX. Doesn't apply to your tranny but here's some comments on another forum I read that might help.

Heavy corrosion on aluminum can be removed mechanically such as by bead blasting, abrasive brushing, and/or sanding but to be stopped it has to be treated chemically. There are many products available, most containing phosphoric acid. With over 45 years of experience in the aircraft industry one of the best and easily obtained products I've found is a #33 Alumiprep. This is a brush-on chemical that you dilute with water. It cleans and brightens aluminum while stopping the corrosion process. This should be followed up with a product such as 1001 Alodine which is a brush-on chemical that conditions the aluminum for a clear finish and corrosion resistance. These products can be found at automotive paint suppliers or ordered online from Aircraft Spruce, 877-477-7823, http://www.aircraftspruce.com or Chief Aircraft, 800-447-3408, http://www.chiefaircraft.com, plus others. Make sure you order Alodine 1001 and not 1201 as 1201 will discolor aluminum unless you are going to prime and paint it. Don't use the above on magnesium!

One of the worst things you can do with aluminum is to use a steel wire brush, steel wool, emory cloth, and or copper alloy brushes. You can use aluminum grit and
silicon carbide abrasives, aluminum-oxide-impregnated nylon abrasive wheels, aluminum wool, and fiber brushes. Stainless steel brushes with the bristles not exceeding 0.010 inch in diameter can be used followed up with 60 grit aluminum oxide paper, 120 grit aluminum oxide paper, and finished up with 400 grit aluminum oxide paper. Follow this up the chemical conversion process semi explained above.

If all you have is light surface corrosion I'd use the #33 Alumiprep followed up with 1001 Alodine.

#33 is real good stuff. I finished a couple aluminum boats over the years. It really cleans but also helps in adhesion of primers too.

Dummy up question...

miller

Well-Known Member

Glenwood

Well-Known Member

miller

Well-Known Member

Glenwood

Well-Known Member

miller

Well-Known Member

Dreamcatcher

Will fish for food

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