caustic causing rust

chirobob

New Member
I beefed up my caustic percentage in the downstraem soap mix to 4% in the two step process and have since found on one older truck that rust was starting to form in areas that posibly could do with repainting. Seeing this I am now going to add 10-20% phosphoric acid to my HF mix to try to counter act this. Has any one else had any experience with sodium hydroxide causing rust? I previously only thought HCl was the major culprit for rust formation.
 

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