THE EFFECT OF (AQUAFINA) DRINKING WATER ON THE CORROSION RA TE &HARDNESS OF (Al-Si) & (AI-Mg-Si) ALLOYS

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  Safaa A.S. Almtori   |   

The present work investigates the effects of drinking water on the erosion- corrosion rate and Vickers hardness of (Al-Si) and (Al-Mg-Si). (Al-Si) alloy Which is well-known as casting alloy with high wear resistance, low thermal expansion coefficient, good corrosion resistance and improved hardness at a wide range of temperatures . While (Al-Mg-Si) . alloys have goqd formability ,weld ability ,machine ability and corrosion resistance .The alloys specimens which are used for piping and containing water and carbonated water were exposed in erosioncorrosion system in factories by using drinking water type AQUAFINA as exposure media for different exposure time (l-30)h. to measure the erosion-corrosion rate . The results show that there is small different in the rate of corrosion, moreover (Al-Mg-Si) alloy have high resistance to erosion-corrosion in drinking water due to the consisting of (Mg2Si) phase which is precipitate as fine particles due to resist dislocations movement lead to high corrosion strength and the (Al~Si) alloy have high Vickers hardness at natural aging due to the present of high ratio hardening silicon element.