Alloys ferro-silicon

Both silicon and aluminium are added to zinc to control the adverse effects of iron. The former forms a ferro-silicon dross (which may be removed during casting). Aluminium forms an intermetallic compound which is less active as a cathode than FeZn,] . Similarly in aluminium and magnesium alloys, manganese is added to control the iron . Thus in aluminium alloys for example, the cathodic activity of, FeAl, is avoided by transformation of FeAlj to (Fe, Mn)Al/. This material is believed to have a corrosion potential close to that of the matrix and is, therefore, unable to produce significant cathodic activity . 

Mg MgCI2 electrolysis or MgO + ferro-silicon hep 1.74 649 1090 Alloys for cars, reducing agent, aircraft, organics... 

Calcium-silicon, ferro-silicon, silicon, silicon carbide, magnesium, zinc and its alloys, copper, and the rare metals have all been the subjects of patents regarding the production of ellccts similar to those of aluminium. 

Silica fume is a byproduct from manufacturing of metallic silicon or various silicon alloys with iron (ferro-silicon) or other metals in electrical arc furnaces. They are formed by oxidation of SiO vapour in the gaseous phase and are precipitated in the dust collectors. 

An inorganic impact modifier has been marketed by the Norwegian waste recovery company, Elkem Materials. It is called Sidistar and made of amorphous silica spheres with a median particle size of about 150 nm. They are derived from the silica fume accumulating during the manufacture of ferro-silicon alloys and silicon metal. Elkem claim that their silica modifiers can impart good impact strength at low temperatures in thermoplastic pipe, and can replace conventional acrylic, MBS and chlorinated polyethylene modifiers. 

J. Kr. Tuset, Principles of Silicon Refining, International Seminar on Refining and Alloying of Liquid Aluminum and Ferro-Alloys, Trondheim, Norway, Aug. 26,1985. 

D. N. Matter, Silicon ItsJUloys andTheir Use, Ohio Ferro-Alloys Corp., Canton, Ohio, 1961. 

Ferro-alloys -cerium m [CERIUM AND CERIUM COMPOUNDS] (Vol 5) -role m steelmaking [STEEL] (Vol 22) -sampling standards for [SAMPLING] (Vol 21) -silicon m [SILICON AND SILICON ALLOYS - CITEMICAL AND METALLURGICAL] (Vol 21) -standards and specification [MATERIALS STANDARDS AND SPECIFICATIONS] (Vol 16)... 

Cast iron having very high resistance to acids is marketed in the form of an alloy containing 12 per cent of silicon and 4 to 6 per cent of aluminum. These ferro-aluminum-silicon alloys are attacked readily only by hydrochloric acid, the most corrosive acid. They were first used in England under the names Ironac and Tantiron. Kieselguss, Acidur, and Clusiron are imitations which are all easily cast, but which are very hard and brittle so that they have to be worked on an emery wheel. These alloys are exceptionally well suited for nitric acid... 

Silicon-Ferro Alloy. See in Vol 6, F16-R to FI 7-L under Ferrosilicons , and the following AddnlRefs (The numbers indicate the appropriate refs listed at the end of this article) ... 

A. Schei (1985) High Purity Silicon Production in Refining and Alloying of Liquid Aluminum and Ferro-alloys, ed. T. A. Engh, S. Lyng, H. A. 0ye, Aluminum Verlag, Dilsseldorf, p. 71-89. 

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