ALUMINUM ALLOY MEMBER, ALUMINUM ALLOY PISTON FOR INTERNAL COMBUSTION ENGINE AND MANUFACTURING METHOD THEREOF

摘要

A piston for an internal combustion engine includes a piston body made of an aluminum alloy material containing silicon and having a piston ring groove formed therein and an anodic oxide film formed on the piston ring groove, wherein a metal containing nickel and zinc is deposited around silicon particles in the anodic oxide film.