| || On Corrosion of Ferrous Metals in Typical Indian Soils Part I : Cast Iron
Author : Vats, Shanti Sarup ;Tripathi, Brajendra Nath
Source : Defence Science Journal ; Vol:15(1) ; 1965 ; pp 13-25
Subject : 621.78.019.84 Corrosion;546.3 Metals;546 Inorganic Chemistry
Keywords : Ferric Oxide ;Statistic;Schwerdtfeger's Soil Corrosion;Indian Soils;Iron
Abstract : Corrodibility of cast iron in ten typical Indian soils, employing Schwerdtfeger's soil corrosion cell procedure and the physico-chemical properties of the soils responsible for their corrosivity have been determined. The results have been statistically analysed, interpreted and correlated with various factors. Corrosion of cast iron in non acidic soils (p/supH4-10) proceeds through electro-chemical mechanism. Usually the rate of corrosion is maximum at the beginning and with development of the film of corrosion products, the rate gradually decrease with time until it becomes more or less constant, 'Even' general corrosion is observed on most of the cases. The maximum penetration is directly proportional corrodibility. The corrosivity of soils in situ is directly poroportional to the moisture equivalent or, in turn, to the clay content. The corrosivity of soils increases with the concentration at soluble electrolytes. Ferric oxide present in a laterite soil functions as a cathodic depolariser and hence increases its corrosivity. In an acidic soil, the corrosion mainly proceeds through the mechanism of direct chemical reaction.
| || Standardization of spectrographic methods of analysis and its role in the zinc die casting alloy industry in India
Author : Naidu, R.D.
Source : Defence Science Journal ; Vol:11(2) ; 1961 ; pp 92-103
Subject : 669 Metallurgy;546.3 Metals
Keywords : Spectrographic methods;Zinc;Die-casting alloys
Abstract : Some spectrographic methods of analysis in general and their application to die-casting alloys in particular have been discussed.
| || Steels in the ordnance factories
Author : Chatterjee, D.P.
Source : Defence Science Journal ; Vol:10(2) ; 1960 ; pp 40-44
Subject : 546.3 Metals
Keywords : Ordnance factories ;Iron and steel industry
Abstract : The growth and development of iron and steel industry in the country, particularly in Ordnance Factories, including their future scope are described.
| || 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,
| || Studies on Electrolytic preparation of Iron Copper Powders
Author : Tamhankar, R.V. ;Acharyulu, L.N.;Athvale, S.V.
Source : Defence Science Journal ; Vol:21(3) ; 1971 ; pp 193-198
Subject : 546.3 Metals;54 Chemistry
Keywords : Binary Metal ;Homogeneous Dispersion;Chemical Composition
Abstract : Factors affecting the physical characteristics and chemical composition of iron-cooper powder deposits obtained by electrolysis, have been investigated. Effect of process variables such as current density, pH, temperature, time, concentration of electrolyte and agitation, has been studied over a wide range, for theoretical interest and to obtain powder deposits of a definite composition. Metallographic examination of iron-copper powder thus prepared after compacting and sintering, has revealed uniform and homogeneous dispersion of the two metals. The technique of preparation presented in this paper is a better substitute to the conventional practice of preparing binary metal powders by mixing and tumbling.
| || Influence of Hardness on Perforation Velocity in Steel Armour Plates
Author : Dikshit, S.N.
Source : Defence Science Journal ; Vol:50(1) ; 2000 ; pp 95-99
Subject : 669 Metallurgy;546.3 Metals
Keywords : Steel armour plates;Plate perforation velocity;Plate plugging velocity
Abstract : In an earlier investigation, the influence of hardness on tempered steel armour plates of 20 mm thickness, impacted by 20 mm diameter steel ogive-shaped projectile at normal, was studied. Additional data is investigated with relation to the perforation velocity of the plates. It is observed that the plate perforation velocity and the plate plugging velocity decrease with increasing plate hardness.