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Galvanic Corrosion Behavior of Aluminum-Carbon Steel
سلوكية التآكل الغلفاني لالمنيوم - كاربون ستيل بأستخدام القطب الاستوائي الدوار


The galvanic corrosion behavior for Aluminum (Al), Carbon steel metals inaerated 3.5% NaCl solution has been investigated under turbulent controlled flow conditions at different temperatures using a rotating cylindrical electrode unit. Corrosion potential, potentiostatic polarization and galvanic corrosion experiments were carried out at 313,323 and 333 k under rotational speed of 0, 50,125 and 200 r.p.m Potentiostatic polarization studies have been performed individually forAluminum and Carbon steel and when they are coupled with an equal area (19.27 cm),of cathode to anode. It was found the mass transfer process as measured by the limiting diffusioncurrent density is not affected by the nature of the cathode material. For coupled metals, it is found that the corrosion process of Carbon steel and Alis under diffusion control since the corrosion rate increases with increasing rotationalspeed.The measured corrosion potentials of these metals give no exact information about thegalvanic corrosion but only show the direction of current flow. The zero resistance ammeter has been used to measure the variation of galvaniccurrent with time. The galvanic current was largely increased with increasing rotational speed(r.p.m.) and temperatures. The corrosion potential of (Al-Cs) coupled is larger than the corrosion potentialof the individual anode member, which means large amount of anodic polarization dueto this galvanic coupling. 2


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