The effect of 4 wt.% Cu addition on the electrochemical corrosion behavior of automotive engine Al-6Si-0.5Mg alloy

 

Chem. Met. Alloys 8 (2015) 69-74

 

Abul HOSSAIN, Fahmida GULSHAN, A.S.W. KURNY

 

The purpose of this paper was to investigate the effect of 4 wt.% Cu addition on the electrochemical corrosion behavior of Al-6Si-0.5Mg alloy in NaCl solution. The corrosion of thermally treated samples was characterized by electrochemical techniques. On the whole, the electrochemical test showed that Cu addition increases the corrosion rate of the alloy. The magnitude of the noble shift in the open circuit potential (OCP), corrosion potential (Ecorr) and pitting corrosion potential (Epit) increased with the addition of 4 wt.% Cu to the Al-6Si-0.5Mg alloy.

 

SEM Secondary Electron Image of the damaged surface morphology of the Al-6Si-0.5Mg-4Cu alloy in 0.1M NaCl solution (immersion time ~67 min at room temperature).

 

Keywords

Al-6Si-0.5Mg-4Cu alloy / Electrochemical test / SEM