Hi there. I bought a bunch of big aluminum screws to help secure an aluminum pergola I'm building (https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1)

I'd like to remove the zinc plating to reduce galvanic corrosion (I'll probably anodize the screws). I Googled it and found a couple tutorials around using citric acid and another using another type of acid. However, when I went to the hardware store, they had nothing of the sort.

Any suggestions for the best way to go about this (or where to get a strong enough acid) ? Thanks!