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STEEL Inhibition of corrosion when embedded in mortar. Under steam‐curing conditions, the corrosion of steel embedded in mortar or concrete can be suppressed by means of inorganic admixture salts. The inhibition of corrosion in such cases is effected by adding to the aggregate a metal chloride whose cation is in the reduced condition. One such compound is stannous chloride, which besides acting as an inhibitor accelerates the strength development of the aggregate in the same way as does calcium chloride. The accelerating effect on strength, and the corrosion‐inhibiting properties of other admixture salts containing reduced cations, are not as great as those of stannous chloride.