Corrosion-inhibiting additive for sodium chloride-based antifreeze preparations for treating road surfaces, and antifreeze preparation containing said additive

摘要

A corrosion-inhibiting additive for sodium chloride-based antifreezing preparations for treating road surfaces, including an inorganic phosphor sodium salt, particularly neutral sodium pyrophosphate having the chemical formula Na₄P₂O₇, with optional traces of methylene blue in an amount equivalent to 0.002% by weight. An aqueous solution containing 12% by weight of the additive is used as moisturizer for the sodium chloride of said antifreezing preparations.