Armco iron

Arkostat AC Aden A ArlenC Armagnac Armco iron Armeen Armeen C Arm Hammer Armid 18 Armid C Armid E Armid HT Armid O Armor... 

A typical shock-compression wave-profile measurement consists of particle velocity as a function of time at some material point within or on the surface of the sample. These measurements are commonly made by means of laser interferometry as discussed in Chapter 3 of this book. A typical wave profile as a function of position in the sample is shown in Fig. 7.2. Each portion of the wave profile contains information about the microstructure in the form of the product of and v. The decaying elastic wave has been an important source of indirect information on micromechanics of shock-induced plastic deformation. Taylor [9] used measurements of the decaying elastic precursor to determine parameters for polycrystalline Armco iron. He showed that the rate of decay of the elastic precursor in Fig. 7.2 is given by (Appendix)... 

In summary, it is clear that the micromechanical shock response of single crystal LiF is extremely complex. These results certainly temper the initial enthusiasm associated with Taylor s [9] study of Armco iron as a eomplete explanation for the relationship between the microscale and the macroscale in shock-loaded solids. 

The comparisons with experimental distributions would be incomplete without examining some exploding munitions data. Data of this type have been published by Mock and Holt (1983) in which explosive-filled cylinders of armco iron and several heat-treated steels were detonated, and the fragments collected and analyzed. A cumulative number distribution from one of the heat-treated steel experiments is shown in Fig. 8.33. The trend of the data in this example is typical of the six experiments performed by them. 

Galvanic anodes of cast iron were already in use in 1824 for protecting the copper cladding on wooden ships (see Section 1.3). Even today iron anodes are still used for objects with a relatively positive protection potential, especially if only a small reduction in potential is desired, e.g., by the presence of limiting values U" (see Section 2.4). In such cases, anodes of pure iron (Armco iron) are mostly used. The most important data are shown in Table 6-1. 

Fig. 1.56(a) E-i curves and experimental potential-pH diagram for Armco iron in chloride-free solutions of different pHs (A is the unpolarised potential and P the passivation potential) and (b) E—i curves and experimental potential-pH diagram for Armco iron in solutions of different pHs containing 10 mol dm of chloride ion (r is the rupture potential and p the protection potential). (After Pourbaix )... 

Derived from data for REP of Armco iron, SAE 1090 steel, Cu, A1 and Zn. 

The copper crystals used in these studies were made from copper of both 99.999% and 99.94% purity, the nickel crystals from metal 99.92% pure nickel plus cobalt, and the iron crystals were made from Armco iron rods of the following approximate composition iron, 99.8 carbon, 0.018 manganese, 0.027 phosphorus, 0.005 sulfur, 0.029 silicon, 0.005 copper, 0.11 %. 

The lattice constant of a-iron determined from patterns of Armco-iron was found to be... 

It is, therefore, taken for granted that the lattice constants of Armco iron and of catalyst KM II are identical within the limits of experimental accuracy, which means that the interior of the catalyst crystallites is very pure iron. 

Wrought gray or malleable iron, plain carbon and low-alloy steels, armco iron -0.70 0.85 ... 

Wei Y.-D., Liu Z.-R. and Wang C.-Y., A note on coating of surface diffusion-infiltration of RE on steel 20 and armco iron by chemical process. Acta Metallurgica Sinica, 19 (1983) pp. B197-199. 

SYNS ANCOR EN 80/150 ARMCO IRON CARBONYL IRON EFV 250/400 EO 5A FERROVAC E GS 6 IRON, CARBONYL (FCC) IRON, ELECTROLYTIC IRON, ELEMENTAL ... 

The advantage of the high-explosive assembly over laser irradiation and electrical discharge devices is the controlled recovery of the sample. The recov-ciy system consists of two rectangular steel blocks acting as momentum traps and a cylindrical ARMCO iron container, which is embedded into the upper steel block. The disc-shaped specimen is encapsulated in this container This design allows complete recovery of relatively large samples (diameters of 10— 20 mm and thickness up to several millimeters). 

Johnson (6) has determined the standard Gibbs energy of formation for LiH(cr) from emf measurements over the temperature range 675 - 885 K. The cell utilized an Armco iron flag over which was passed as the cathode and a molten Li anode. LiCl,... 

Cathode Steel Armco iron Steel Steel Steel Steel Steel... 

A very wide field, where the electric resistivity of the medium plays a decisive role on the possibility of studying the behaviour of a system accurately by means of electrochemical techniques, is that of organic environments. To examine the behaviour of ARMCO iron and some low alloy steels in methanol solutions Mazza et al. [10, 11] were compelled to add 0.1 M of lithium perchlorate to them. This device, which can be adopted because the adsorption of LiClO on the surface of the specimen may be disregarded [12], enables one to avoid the use of too high anodic potentials, which might cause oxidation of the methanol [13]. 

In this connection, reference might be made to a study [39] dealing with the monitoring of corrosion of ARMCO iron in an H2SO4 1 N solution through the use of po-tentiodynamic curves and the determination of the concentration of Fe " " ions by the spectrophotometric technique. 

This assertion is supported by the data in Table 1 concerning the behaviour of ARMCO iron in 1 m HCl solutions at various temperatures [40]. The direct evaluation of the corrosion current density. Id, was obtained from the determination of the concentration of ferrous ions, entered the solution, by the spectrophotometric technique. The galvanostatic pulse polarization curves were performed using the CORRCONTROL system [41] and the GALIMP program [42]. The corrosion current density, Ic, was computed using the NOLI method [34]. 

The values of the corrosion current density determinations listed in Table 1 clearly show that their agreement tends to deteriorate as the dissolution rate of ARMCO iron increases. This observation is of a general nature because the same behaviour was observed in the case of the behaviour of ARMCO iron in 0.5 m H2SO4 solutions [40]. 

Such a situation was observed in the case of ARMCO iron specimens immersed in 0.5 m H2SO4 solutions at 65 °C. In the case under discussion, for instance, the geometry of the electrolytic cell and the relative position of the reference and working electrodes, the latter with an exposed surface area of 10.7 cm, gave rise to an electrolyte resistance of 0.36 fl. On the other hand, the true polarization resistance value after 150 minutes was 1.08 Q cm. Hence the value of the term RsS was higher than the polarization resistance value. The corrosion current density value computed using the NOLI method was 24.1 mAcm , while the Tafel slopes were Ba=l52 mV and 5 =102 mV. 

The results obtained in the hypothetical case, characterized by 5a =30 mV, 5c=120 mV and R,=2 ft, are given in Table 3. The corrosion current density values shown in the first colunm are very realistic and can be obt2uned, for example, by studying the behaviour of ARMCO iron in H2SO4 solutions at variable concentration and at a temperature greater than room temperature. 

The importance of this problem is underlined by the data in Table 4 concerning the behaviour of ARMCO iron in 1 N HCl solutions inhibited with the commercial product Borg P16 at a temperature of 75 °C. Borg P16 is a specific commercial inhibitor of the corrosion of iron and carbon steels in hydrochloric acid solutions and is a derivative of the commercial product Rodine 213. This inhibitor is used both for the acid cleaning of steam generators and for pickling baths. 

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