How Corrosive is Propylene Glycol to Hot-Dip Galvanized Steel?
According to Frank Porters book, Corrosion Resistance of Zinc and Zinc Alloys, propylene glycol will corrode zinc-coated steel less than 0.5 mil per year. Please note that temperature or concentration information are not given for this corrosion rate.
Source:
Corrosion Resistance of Zinc and Zinc Alloys, pg. 419
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