De-Icing

Sodium gluconate in low concentrations is an effective corrosion inhibitor. Corrosion of vehicles, bridge decks and guardrails has often been a problem, especially in winter when sodium chloride is used for road de-icing. These structures are often constructed of carbon steels which are particularly prone to oxidative corrosion. This occurs because air from the atmosphere will dissolve in the snow and ice. The dissolved oxygen will diffuse into the metal inducing corrosion. The addition of salt only accelerates this process. The corrosion can be inhibited by dissolving sodium gluconate in concentrations above 100 ppm in addition to other components. This will generate the formation of a thin protective film on those metal surfaces. This film inhibits the diffusion of the dissolved oxygen to the metal surface lowering the corrosion rate of the metal.