how to stop aluminum corrosion
I had some water damage to the front center part of trailer where there is the horizontal crest right above the propane tanks. The water caused corrosion pinholes to form. To fix this I was just goin...
Forum Discussion
GordonThree wrote:
Aluminum is naturally is self protecting, untreated aluminum forms an oxide layer that protects it from further oxidation. However aluminum in contact with steel, iron or copper means trouble.
In its pure state it will protect its self, but we never see pure aluminum in service. we see alloys.
The alloys are two or more different metals, So when there is a electrolyte present there will be two different metal molecules in contact with the electrolyte and it become a galvanic cell and will continue to corrode exposing more and more different molecules to the electrolyte. This will continue until there is no more metal to expose.
The excepted method of treatment is, etch it with a 10% solution of phosphoric acid, remove all corrosive deposits, treat with a 6% solution of chromic acid, rinse well, and protect with paint, the best is a chromate primer used in the marine industry.
All these products can be bought at "Aircraft Spruce and Speciality" on line, they ain't cheap, and they ship with HazMat charges.
Alowdine 1200 is the 6% chromic acid
read the notes at the bottom of the link.
