Aluminum alloy elements commonly used copper, zinc, manganese, silicon, magnesium, etc., in the early 20th century, invented by the German Alfred Wilm, greatly helped the development of the aircraft, after World War I German aluminum components are classified as state secrets. Compared with ordinary carbon steel is lighter and corrosion performance, but not as good as anti-corrosive aluminum. Protective oxide layer in a clean, dry environment will form the surface of the aluminum alloy. Circumstances cause galvanic corrosion (Galvanic corrosion) acceleration are: aluminum and stainless steel case contact corrosion potential is lower than other metals aluminum or in a wet environment. If you want to use with aluminum and stainless steel must have a water-containing systems or outdoor installation between two metal electronic or electrolytic isolation.
Aluminum components need to be American Aluminum Association (Aluminium Association, AA) to register. Many organizations publish more specific aluminum manufacturing standards, including the American Society of Automotive Engineers (Society of Automotive Engineers, SAE) in particular aviation standards [1], as well as the American Society for Testing Materials (American Society for Testing and Materials, ASTM).

Alloy Code:
Forging and casting aluminum alloy with a different naming system. Forged aluminum alloy using a four-digit number, which includes the proportion of alloy composition. Type 4-digit number after the dash on behalf of the heat treatment, such as "6061-T6." Cast aluminum alloy using 4-5 digit numbers with a decimal point. In the one hundred-digit number represents the alloying elements, the decimal point is used to identify castings or ingots.

Forged alloy:
American Aluminum Association (Aluminium Association, AA) taken with forged alloy similar nomenclature. BS (British Standard, BS), German Standard (Deutsches Institut für Normung, DIN) to use a different name. In the U.S. Aluminum Association (AA) system, and the second two digits represent the minimum amount of aluminum, for example, contains at least 99.50% 150.x representatives aluminum. The figures after the decimal value of 0 or 1, the international alloy naming system (International Alloy Designation System) named forged alloy is widely accepted. Each alloy is due to the four-digit number, where the first digit is the main alloying elements.

1000 series containing at least 99% (weight percent) aluminum
2000 series of copper alloys, strength comparable to steel. Formerly known as duralumin, aerospace alloys are commonly    used, but susceptible to intergranular corrosion, the 7000 series is gradually replaced.

3000 series manganese alloys, there are hardening.
4000 series silicon alloy, also known as silicon aluminum Ming
5000 series alloys, hardening resolve, strength comparable to steel.
Magnesium ferrosilicon alloy series 6000, ease of processing, curing may be deposited to obtain a not very high strength.

7000 zinc alloy, precipitation hardening, with the highest intensity in all the aluminum alloy.
8000 Series mixed

Basically we are talking about the aluminum pan is aluminum pot because aluminum (99.997) pot is too soft and does not heat (about 480 degrees begin to soften) so not suitable for pots, nor do people take aluminum pot. As for aluminum products cooked food can lead to dementia really big wronged ah! Because according to neuropathological College, Oxford University professor of three joint study of the brain of harmful aluminum has been corrected to say. The study of eighty patients with Alzheimer's disease in the brain tissue for biopsy confirmed that aluminum does not exist in the brain of patients. Previously identified aluminum elements with dementia related, because the traditional production of brain slices and dyeing process, the aluminum element is often necessary supplies, so the test results with aluminum elements and nuclear electron microscopy professor at Oxford University are using, but it is not subject to staining procedure to analyze slices. "Foods generally contain aluminum. This proves that the reason is not caused by Alzheimer's disease aluminum elements, otherwise those cola / soda and aluminum foil package should have a replacement!

                                     ( The following is a professor of public health Tokyo Shimizu British woo Research )
The COA noted that the experimental results showed that the release of aluminum from aluminum vessel is extremely low, 85% of the food after cooking with aluminum pots , aluminum content per 100 grams of food increased by less than 1 mg per body only day by the average food intake of a small portion of 14 mg . COA said food, water , drugs are a major source of human intake of aluminum , the use of aluminum pots cooking food should be harmless. Aluminium is a light metal , it " Cd " " Mercury ", " lead " and other heavy metals are fundamentally different in nature, it does not accumulate in the body. The human body can very efficiently reject aluminum absorption , excretion can be easily aluminum ( about 99% aluminum intestinal excretion , leaving about 1% excreted in the urine via the kidneys ) .
Aluminum pan in the manufacturing process , are subjected to a technique called " anodized " project, its purpose is to generate artificial methods and solid thick alumina film on the surface of aluminum , which has a protective inner coating efficacy of the material . This aluminum skin hardness is very high, about 20 times for the untreated aluminum , iron and steel than the general , even with diamonds match. It is quite stable chemically , it has a good corrosion resistance, and the conditions of daily cooking enough to destroy it . In our experience, the more often the more durable aluminum pan to cook , this is because there is boiling water or steam " sealing " effect , you can put into the alumina film is more detailed, more close together, more protection.