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Galvanic corrosion. Appearance. Corrosion of an iron nail wrapped in bright copper wire, showing cathodic protection of copper; a ferroxyl indicator solution shows colored chemical indications of two types of ions diffusing through a moist agar medium. Galvanic corrosion (also called bimetallic corrosion or dissimilar metal corrosion) is an ...
A thermite weld in progress. Exothermic welding, also known as exothermic bonding, thermite welding(TW),[1]and thermit welding,[1]is a weldingprocess that employs molten metal to permanently join the conductors. The process employs an exothermic reactionof a thermitecomposition to heat the metal, and requires no external source of heat or current.
Galvanic series. The galvanic series (or electropotential series) determines the nobility of metals and semi-metals. When two metals are submerged in an electrolyte, while also electrically connected by some external conductor, the less noble (base) will experience galvanic corrosion. The rate of corrosion is determined by the electrolyte, the ...
Galvanic cell. Galvanic cell with no cation flow. A galvanic cell or voltaic cell, named after the scientists Luigi Galvani and Alessandro Volta, respectively, is an electrochemical cell in which an electric current is generated from spontaneous oxidation–reduction reactions. A common apparatus generally consists of two different metals, each ...
Aluminum building wiring. Aluminum building wiring is a type of electrical wiring for residential construction or houses that uses aluminum electrical conductors. Aluminum provides a better conductivity-to-weight ratio than copper, and therefore is also used for wiring power grids, including overhead power transmission lines and local power ...
Aluminium–copper alloys. Aluminium–copper alloys (AlCu) are aluminium alloys that consist largely of aluminium (Al) and traces of copper (Cu) as the main alloying elements. Important grades also contain additives of magnesium, iron, nickel and silicon (AlCu (Mg, Fe, Ni, Si)), often manganese is also included to increase strength (see ...
A squirrel-cage rotoris the rotating part of the common squirrel-cage induction motor. It consists of a cylinder of steel laminations, with aluminium or copper conductors embedded in its surface. In operation, the non-rotating statorwinding is connected to an alternating currentpower source; the alternating current in the stator produces a ...
A metal ion in aqueous solution or aqua ion is a cation, dissolved in water, of chemical formula [M (H 2 O) n] z+. The solvation number, n, determined by a variety of experimental methods is 4 for Li + and Be 2+ and 6 for most elements in periods 3 and 4 of the periodic table. Lanthanide and actinide aqua ions have higher solvation numbers ...