Re: Rust question
Citric acid and phosphoric acid can both be used in dealing with rust, but each does something different.
Citric reacts in a way that helps to remove rust by getting it to dissolve or at least go into suspension. Phosphoric reacts to convert the existing rust in to layer of iron phosphate, which then impedes further rusting, especially if followed up with a good corrosion-resisting paint.
I'm rather dubious about some of the more modern 'rust converters', so while I'm happy with Jenolite original products (based on phosphoric acid), I've tried there more modern ones and was disappointed.
B
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