The effect of adding different percentages of Copper on corrosion of pure Aluminum
Aluminum and its alloys normally solidify in a columnar structure according to directionally slow cooling rate which results in decreasing the mechanical strength. Aluminum has a huge tendency to unite with oxygen to form oxide film on its surface, offers of it excellent resistance to corrosion and provides years of maintenance-free service and offered it excellent corrosion resistance and spare a lot of years without maintenance. Because of the aluminum and its alloys in fact work applications. Study was carried out on the coppers impact in addition to pure aluminum were six different Al-Cu alloys of (1, 2, 3, 4, 5 and 6) wt% Cu content were prepared and experimentally tested in acidic and alkaline medium. As in general the increase in the percentages of copper led to increased total corrosion rates of the samples submerged in corrosive medium. From obtained results has been reached that the corrosion rate of the alloy which 6%Cu content was (0.02585MPY) higher than the corrosion rate of the alloy of the 1%Cu content where it was (0.00081MPY) were the two alloys submerged in acidic medium, while the corrosion of the alloy 6%Cu was (0.505414MPY) higher than the from the corrosion rate of 1%Cu which it was (0.433369MPY) were the two alloys submerged in alkali medium. As was attained that the corrosion rates in the alkaline medium were higher in acidic medium corrosion rates.