zero airplane wikipedia 7075 aluminium alloy 7075 aluminium alloy is used in different fields as aeronautics, car, bikes, tools, marine due to their high strength-to-density ratio. As well, is used in M16 riflor American military. It is a material that was developed by Sumitomo, e fa Japanese company. Later 7075 was used for the Zero fighter airframe of the Imperial Japanese Navy. Aluminium density has half that of titanium and four times less that of steel (2,8 kg/m3). 7075 aluminium is an alloy with 6.1% zinc, 2.5% magnesium and1.6% copper and the rest aluminium. It has a good machining very strong and strength similar that many steels. It is not resistant to wear or weak acid. So, this material wears out in watches. As well, due to its strength, density, thermal properties and its ability to be highly polished, 7075 is widely used in mould tool manufacture. Anyway, this material permits a good finishing, so it is coated in some processes like anodised, CVD, electroplating, PVD and many more. Anyway, in a lot of cases is preferable anodising because is cheap and the coat can be very strong if it is used the hard anodizing. It can be reach up to 100 microns in the coated. There are a lot of aluminium cases because of that allows to do many colours for that. The problem with this material for watches is the corrosion because the sweat human damages case back watch . Moreover, is very soft and a shock slight it can damage watch case. These problems can be corrected changing the case back with steel or increasing the watchcase thickness. Anyway, hard coating anodized with a 50 microns coat may be enough for solving the sweat human.zero airplane wikipedia 7075 aluminium alloy 7075 aluminium alloy is used in different fields as aeronautics, car, bikes, tools, marine due to their high strength-to-density ratio. As well, is used in M16 riflor American military. It is a material that was developed by Sumitomo, e fa Japanese company. Later 7075 was used for the Zero fighter airframe of the Imperial Japanese Navy. Aluminium density has half that of titanium and four times less that of steel (2,8 kg/m3). 7075 aluminium is an alloy with 6.1% zinc, 2.5% magnesium and1.6% copper and the rest aluminium. It has a good machining very strong and strength similar that many steels. It is not resistant to wear or weak acid. So, this material wears out in watches. As well, due to its strength, density, thermal properties and its ability to be highly polished, 7075 is widely used in mould tool manufacture. Anyway, this material permits a good finishing, so it is coated in some processes like anodised, CVD, electroplating, PVD and many more. Anyway, in a lot of cases is preferable anodising because is cheap and the coat can be very strong if it is used the hard anodizing. It can be reach up to 100 microns in the coated. There are a lot of aluminium cases because of that allows to do many colours for that. The problem with this material for watches is the corrosion because the sweat human damages case back watch . Moreover, is very soft and a shock slight it can damage watch case. These problems can be corrected changing the case back with steel or increasing the watchcase thickness. Anyway, hard coating anodized with a 50 microns coat may be enough for solving the sweat human.]]>