Aluminum

Topic: Physics

Name: Aluminum
Chemical Name: Al
Atomic number: 13
Appearance: Silver
Atomic mass: 26.981538 u
Melting Point: 660.33 º C
Boiling Point: 2519 º C

Discovered

In ancient Greece used alum, when called to the alum, and potassium aluminum sulfate as haemostatic agents and as binders in dyeing. 1807 gave the Englishman Davy named the element aluminum, although it is not detected. 1827 was isolated by the German Wohlen.

Incidence

Aluminum is the metal which it appears most of the earth's crust, 8.3%. It is the third most common element in the earth's crust, and then oxygen including the most common, but it never occurs in pure form but in different compounds, usually with oxygen and silicon. Examples of aluminum compounds are: böhmit, diaspor, gibbsit, bayerit, ruby, sapphire, feldspar, mica and common clay.

Petition

Aluminum is produced from bauxite. Bauxite contains around 50 - 60% alumina, and first account of pure aluminum oxide produced in a chemical process. Alumina is dissolved electrowin at high temperatures, also known as igneous, in a special furnace. The pure, molten aluminum accumulating on the bottom of elektrolysugnen and charged. When aluminum is produced from aluminum scrap (eg. Beer cans) used only 5% of the energy wasted in production of bauxite into aluminum.

Usage

Aluminum is used for soda and beer cans as it does not rust, is lighter than steel, and easier to recycle. It is also used for telescope mirrors, decorative paper, packaging, bikes and toys.If aluminum alloyed with small amounts of copper, magnesium, silicon, manganese, and a few more threads you can get alloys for aircraft and rockets. It has now also beginning to use aluminum to cars to make them easier and not take so much gasoline.

Properties

Aluminum is lightweight and can be easily shaped and molded. It conducts heat and electricity well and corrodes almost not at all. Since it is easy, inexpensive and leads the electricity used for electric power lines.

Corrosion

Aluminum is often considered as a non-corroding metal, but it is wrong. Aluminum corrodes but produces pH 4 and 9, a passive oxide film that protects the material. Alloys corrode faster than pure aluminum and aluminum containing copper corrodes fastest. It manages to be in sulfuric acid, nitric and acetic acid by either formation of passive oxide film or acetates which isolates the aluminum from the oxidant.

Other

Aluminum is not as harmless as they say. It damages plant root hairs and thus disrupt the plant's water uptake.It can also harm people, it is suspected that they may have damage to the nervous system and brain of too much aluminum. They say you can get Alzheimer's, etc..

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