Due to the lack of salts capable of forming protective films in distilled water, its corrosion effect on zinc coatings is significant, second only to rainwater, slightly higher than that of soft water, and approximately three-quarters of the corrosion rate in tap water.
If this distilled water exists as an extremely thin layer on the surface of the zinc coating, the oxygen content in the water film is the highest, leading to the most intense corrosion under such conditions.
Generally speaking, the corrosion rate of zinc coatings in distilled water ranges from 50 to 200 milligrams per square decimeter per day.
