CORROSION INHIBITION OF STEEL IN CONCRETE BY CARBOXYLIC-ACIDS

Water soluble carboxylic acids have been used as corrosion inhibitors. They remain largely soluble after curing in cement for up to 90d. Cor rosion current measurements are presented showing malonic acid, a dica rboxylic acid, to be a very effective corrosion inhibitor even in the presence of 2.5 wt % chloride. Unfortunately, it has an initial retard ing effect on the set of Portland cement. The investigation suggests t hat corrosion inhibitors based on carboxylic acids remain a fruitful f ield of investigation.