In the present study, the corrosion behaviour of A356 (Al-7Si-0.3Mg) alloy in 3.5% NaCl solution has been evaluated using

cyclic/potentiodynamic polarization tests. The alloy was provided in the unmodified form and it was then modified with AlTi5B1 for grain

refinement and with AlSr15 for Si modifications. These modifications yield to better mechanical properties. Tensile tests were performed.

In addition, bifilm index and SDAS values were calculated and microstructure of the samples was investigated. As a result of the corrosion

test, the Ecorr values for all conditions were determined approximately equal, and the samples were pitted rapidly. The degassing of the

melt decreased the bifilm index (i.e. higher melt quality) and thereby the corrosion resistance was increased. The lowest corrosion rate was

founded at degassing and as-received condition (3.9x10-3 mm/year). However, additive elements do not show the effect which degassing

process shows.