Iron-aluminium system

Vol] Volkova, M.A., Kornilov, I.I., Study on the Phase Constitution of Alloys of the Ternary Titanium-Aluminium-Iron System (in Russian), Khim. Met. Splav., 1, 77-80 (1973) (Phase Diagram, Phase Relations, Experimental,, , 9)... 

Those salts which hydrolyse to give an acid solution, e.g. the strong acid salts of aluminium, iron and, to a lesser extent, calcium, give solutions which may be very corrosive to cast iron, particularly if they are well aerated. When oxidising salts are also present in these acid solutions, a particularly dangerous system may be created. It is owing to this combination of oxidising and acidic character that mine waters are so corrosive. 

It can be observed that for type A synthesis system the amount of iron incorporated into the zeolite is related to its content in the TPABr-rich hydrogel systems (see samples 1 (A) and 2 (A) in Table 2). For a higher TPABr amount, equal to 0.08, even in the presence of aluminium, iron is incorporated preferentially respect to aluminium (see samples 3 (A), 24 (A) and 25 (A) in Table 2). When the TPABr content in the initial reaction mixture decreases down to 0.04, the amount of iron found in the zeolite decreases (see sample 26 (A) in Table 2). Finally, for a TPABr content equal to 0.02, the aluminium atoms are preferentially incorporated in the MFI framework, so much so that only a little amount of iron is detected in the chemical composition. 

Aluminium-Iron. Figure 3.1-13 shows the Al-rich part of this system. The solubility of Fe in Al is very low. In the range shown AlsFe is formed by a peritectic reaction at 1160 °C. The eutectic between the Al phase and AIbFc crystallises in a degenerate manner to form brittle needles of Al3Fe. The formation of AIbFb needles is also occurring in Al—Fe—Si alloys such as commercially (available) pure aluminium (Fig. 3.1-14). 

Safety in the use of the lithium (aluminium) iron monosiilphide battery is superior to that of other secondary batteries. No special precautions are needed to remove toxic or explosive gases as occur, for example, in the case of lead-acid or zinc-bromine systems. 

Westinghouse are developing a 36 V electric vehicle lithium-aluminium-iron sulphide battery which has a specific energy of 112 W h/kg on the basis of cell mass and 98 W h/kg on the basis of battery module weight including heat dissipating system. 

Rag] Raghavan, V., The Al-C-Fe (Aluminium-Carbon-Iron) System in Phase Diagrams of Ternary Iron Alloys. Parti", ASM International, Metals Park, OH, 89-97 (1987) (Phase Relations, Phase Diagram, Review, 30)... 

Rag] Raghavan, V., The Al-Fe-P System (Aluminium-Iron-Phosphorus) , J. Alloy Phase Diagrams, 5(1), 32-39 (1989) (Review, Crys. Structure, Phase Diagram, Phase Relations, 5)... 

Jae] Jaeniche, W., On the System Aluminium-Iron-Silicon (in German), Alum. Arch., (5), 1-21 (1936) (Crys. Stracture, Phase Diagram, Experimental,, , 28)... 

Bed] Bedon., P, Ansara, 1., Desre, P, Isothermal Seetions at 1900 K of the Silver - Aluminium -Iron - Silieon and Silver - Aluminium - Niekel - Siheon Metallie Systems Aetivity of Aluminium in Molten Aluminium - Iron - Silver - Siheon and Aluminium - Niekel - Silver Alloys (in Freneh), Mem. Sci. Rev. Metall., 66, 907-913 (1969) (Experimental, Thermo-dyn., 5)... 

Riv] Rivhn, V.G., Raynor, G.V., Phase Equilibria in Iron Ternary Alloys 4 Critical Evaluation of Constitution of Aluminium-Iron-Silicon System , Int. Met. Rev., 26,133-152 (1981) (Phase Diagram, Review,, , 56)... 

Kre] Krendelsberger, N., Constitution of the Systems Aluminium-Manganese-Silicon, Aluminium-Iron-SiUcon, und Aluminium-Iron-Manganese-Silicon , Thesis, Inst, of Physical Chemistry, University of Vienna, 2001 (Crys. Stractuie, Phase Diagram, Experimental,, , 83)... 

Dew] Dew-Hughes, D., Kaufman, L., Ternary Phase Diagrams of the Manganese-Titanium-Iron and Aluminium-Titanium-Iron Systems a Comparison of Computer Calculations with Experimenf , Calphad, 3, 175-203 (1979) (Thermodyn., Phase Relations, Phase Diagram,... 

The data in Tables 4.2 and 4.3 refer to ions in aqueous acid solution for cations, this means effectively [MlHjO), ]" species. However, we have already seen that the hydrated cations of elements such as aluminium or iron undergo hydrolysis when the pH is increased (p. 46). We may then assume (correctly), that the redox potential of the system... 

Aluminium fluoride (anhydrous) [7784-18-4] M 84.0, m 250°. Technical material may contain up to 15% alumina, with minor impurities such as aluminium sulfate, cryolite, silica and iron oxide. Reagent grade AIF3 (hydrated) contains only traces of impurities but its water content is very variable (may be up to 40%). It can be dried by calcining at 600-800° in a stream of dry air (some hydrolysis occurs), followed by vacuum distn at low pressure in a graphite system, heated to approximately 925° (condenser at 900°) [Henry and Dreisbach J Am Chem Soc 81 5274 1959]. 

The metals most commonly used for water systems are iron and steel. These metals often have some sort of applied protective coating galvanised steel, for example, relies on a thin layer of zinc, which is anodic to the steel except at high temperatures. Many systems, however, contain a wide variety of other metals and the effect of various water constituents on these must be considered. The more usual are copper, brasses, bronzes, lead, aluminium, stainless steel and solder. 

It should be noted that when metals like zinc and aluminium are used as sacrificial anodes the anode reaction will be predominantly 10.18a and 10.186, although self-corrosion may also occur to a greater or lesser extent. Whereas the e.m.f. between magnesium, the most negative sacrificial anode, and iron is =0-7 V, the e.m.f. of power-impressed systems can range from 6 V to 50 V or more, depending on the power source employed. Thus, whereas sacrificial anodes are normally restricted to environments having a resistivity of <6 000 0 cm there is no similar limitation in the use of power-impressed systems. 

Aluminium cast onto steel or cast iron is used to produce integral aluminium/steel drums and bimetallic pistons. Aluminium clad onto other metals by mechanical bonding is used in heat-exchanger systems subject to multiple atmospheres or environments. The clad products are also used for cooking utensils and functional press work. 

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