The polarity of the zinc-steel galvanic couple in hot aqueous solutions was published more than 20 years ago. It used an inorganic zinc primer coating that was applied under thermal insulation at elevated temperatures [30C-60C (86F-140F)].

Since the year 2000, industrial practices or standards do not recommend using inorganic zinc rich coatings under thermal insulation. Research has showed over the years that good practice of corrosion prevention under insulation is to apply an additional layer of a heat resistant modified epoxy or inorganic polymer coating as an additional barrier.

Subject
Corrosion prevention, Zinc rich coatings, Water, Insulation, Moisture, Corrosion rate, Metal surfaces, Film formation, Heat, Steel, Corrosion resistance, Zinc, Inorganic zinc rich coatings
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2015
Association for Materials Protection and Performance (AMPP)
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