Non ferrous Metals and Alloys

Table 2.18 Corrosion rates of non-ferrous metals and alloys in sea water...

Cairns, J. H. and Gilbert, P. T., The Technology of Heavy Non-Ferrous Metals and Alloys, Butterworths, London (1967)... 

Table 11.3 summarises the pickling conditions for removing oxide and scale from some of the more important non-ferrous metals and alloys. 

In view of possible or probable variations in mechanical properties among different specimens of the same metal cut from different sheets or other pieces, or even from different sections of the same sheet or piece, it is necessary to pay careful attention to the initial sampling of stock to be used for control, as well as exposure, specimens. An interesting case in which several of these considerations were involved was provided by the long-time atmospheric exposure tests of non-ferrous metals carried out by Subcommittee VI of ASTM Committee B-3 on Corrosion of Non-Ferrous Metals and Alloys in which changes in tensile properties were used as one of the means of measuring the extent of corrosion. 

Non-ferrous Metals and Alloys Diaphragm material, metal composite, refractory metal. 

Uses. Used in iron and steel production and in non-ferrous metals and alloys. It improves the creep strength of tin and the mechanical properties of lead. Used also in the vulcanization of rubber to reduce curing time and improve its characteristics. 

Weibenbacher N, Gobel R, Kellner R (1996) Ag-layers on non-ferrous metals and alloys. A new substrate for Surface Enhanced Raman scattering (SERS). Vib Spectrosc 12 189-195... 

Some of the non-ferrous metals and alloys have already been mentioned such as copper and brass. Archaeological bronze is an alloy of copper and tin. The composition of these alloys ranges typically from 3% to 14% tin together with trace impurities such as lead and iron, depending on the chemical content of the original ores. Alloys with atin content, up to 6%, were capable of being cast and subsequently hammered into their final shape. This is due to the tin being soluble in the copper crystal structure, which allows the alloy to be deformed at room temperature. 

Vapour phase inhibitors can also be considered as adsorption inhibitors. These are used for protection of wrapped components temporarily. The inhibitor is placed together with the component(s) and acts due to its suitable low saturation pressure, leading to a sufficiently durable inhibitor condensate on the metal surface. By this the effect of water and oxygen is prevented. It should be emphasized that these inhibitors may accelerate corrosion on some non-ferrous metals and alloys. Examples of vapour phase inhibitors are bicyclohexyl-ammonium nitrite and cyclohexyl-amine carbonate. 

Foundries melt ferrous and non-ferrous metals and alloys and reshape them into products at or near their finished shape through the pouring and solidification of the molten metal or alloy into a mould. The foundry industry is a differentiated and diverse industry. It consists of a wide range of installations, from small to very large each with a combination of technologies and unit operations selected to suit the input, size of series and types of product produced in the specific installation. The organisation within the sector is based on the type of metal input, with the main distinction being made between ferrous and non-ferrous foundries. 

An extensive study of the corrosion of metals in tropical environments has been carried out by Southwell, etal . Tests have included atmospheric exposure, and exposure in sea-water under mean tide and fully immersed conditions for a range of ferrous and non-ferrous metals and alloys. 

Friend, J. N. (1928). The relative corrodibilities of ferrous and non-ferrous metals and alloys. Part 1, The results of four years exposure in Bristol Channel. J. Inst. Met., 39, 111-143. 

Fuller, T. S. (1927). Report of ASTM Committee B-3 on Corrosion of Non Ferrous Metals and Alloys. Proc. ASTM, 27(1) 281-298. 

ISO 27831-2 Metallic and other inorganic coatings. Cleaning and preparation of metal surfaces. Non-ferrous metals and alloys. 

Melting, Smelting, and Casting of Metals. Molded graphite has numerous e iplications in the processing of ferrous and non-ferrous metals and alloys such as copper, copper-nickel, brass, bronze, zinc, aluminum alloys, nickel and its alloys, precious metals, and grey and ductile irons.l°ll °l The wide variety of these applications is shown in the following partial list ... 

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