The influence of mechanical grinding on the microstructure and corrosion behaviour of A356 aluminium alloys

In the automotive industry, mechanical grinding is employed at finishing line rectification to remove defects left over from upstream, which may also result in microstructure modification within near-surface region of work piece and, consequently, affects its corrosion performance. The present investigates influence on and behaviour Al–Si–Mg (A356) alloy castings order advance understanding potential issues. It found that a deformed layer with maximum thickness 3 ?m, characterised by ultrafine equiaxed grains 50–150 nm diameter, introduced process ?-aluminium matrix. has significant impact alloy; specifically, preferential dissolution occurs when exposed NaCl solution, together trenching aluminium matrix around eutectic silicon particles.