Phosphate
I make my own phosphate solution for steel and iron tools.
I use 88%W/W orthophosphoric acid mixed in the ratio 15% into tap water with a sprinkle of sodium nitrate in it.
Works well to protect tools I them dip them in oil and hang them up gives a dry film similar to when they were first produced.
Lasts for ages this is well tested - I live in Wales!
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Colin
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