Living in Hawaii, things rust fast...... super fast. Trivia, and surprise, when I was living in Oahu things rusted much faster than here on the big Island. About a year ago I bought a piece of 1/4" steel for making a sanding disc. I decided not use it as I thought it would be too heavy for the motor and opted for aluminum instead. Anyway, I left in storage and it rusted (as shown in pix 1)
So, I cleaned it with about 72 grams of 99% pure citric acid mixed in a gallon of water.
Attached are the pixs of the piece before and after
After 3-4 hours in the acid, I washed it off and green scrubbed clean. Then sanded the top with 150 for about 1-2 min a side and then cleaned with rubbing alcohol and primed.
Personally, I think the phosphoric acid is more effective, but this is what I had.
All the other things I de-rustred cleaned up nicely. I think that was due to the better alloy steel.
So, I cleaned it with about 72 grams of 99% pure citric acid mixed in a gallon of water.
Attached are the pixs of the piece before and after
After 3-4 hours in the acid, I washed it off and green scrubbed clean. Then sanded the top with 150 for about 1-2 min a side and then cleaned with rubbing alcohol and primed.
Personally, I think the phosphoric acid is more effective, but this is what I had.
All the other things I de-rustred cleaned up nicely. I think that was due to the better alloy steel.
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