| || On Potentials of Ferrous Electrodes in Soil Corrosion Cells
Author : Tripathi, B.N.
Source : Defence Science Journal ; Vol:16(2) ; 1966 ; pp 125-132
Subject : 54 Chemistry
Keywords : Indian soils;Cells;Ferrous metals
Abstract : Open circuit potentials of electrodes and short circuit of soil corrosion cells constituted by cast iron, mild steel and wrought iron electrodes in the typical Indian soils have been determined and the voltages and the internal resistances of the cells have been calculated. The electrode potentials do not have a simple correlation with any of the soil properties. In non-acidic soils, the cell voltage at first increases abruptly with moisture equivalent, reaches maximum at about 15 and then decreases gradually. Based on this an interpretation has been offered for the maximum corrosivity of soils, having moisture equivalent, 30, as observed for mild steel and wrought iron. In an acidic soil electrode potentials of all the ferrous metals are indentical and cell voltages, very small. Hence most of the corrosion proceeds through direct chemical reaction. Cast iron is slightly less corrodible than mild steel and wrought iron because of additional protective influence of liberated carbon deposited over the metal.
| || Studies on Indian bentonite as the carrying medium in corrosion inhibitive compositions for ferrus metals
Author : Sanyal, B. ;Singhania, G. K.
Source : Defence Science Journal ; Vol:9(4) ; 1959 ; pp 293-300
Subject : 621.78.019.84 Corrosion;546.3 Metals
Keywords : Corrosion;Indian Bentonite;Ferrous Metals
Abstract : A new type of preservative based on chemical inhibitive incorporated in a suspension of bentonite in water was developed by Sanyal &Preston which proved as efficacious as petroleum base compositions for protection of steel against corrosion during storage and promised to be useful in some fields where use of petroleum base compositions was not feasible. In the present investigation, the performance o f Indian bentonite as the carrying medium for a wide range of chemical inhibitors and their mixtures, ha8 been studied,