Mechanical component for internal combustion engine, manufacturing method of mechanical component for internal combustion engine, and mechanical component

A manufacturing method of a mechanical component for an internal combustion

• engine, the manufacturing method of comprising steps of:
• forming a reforming layer that includes nickel and a concave-convex form on a surface of a predetermined portion of a mechanical component body that is made of one of aluminum and aluminum alloy by a fine particle shot peening process utilized nickel and performed on the surface of the predetermined portion of the mechanical component body, the nickel in the reforming layer being embedded by the fine particle shot peening process;
• and
• forming a nickel plating layer to cover the surface of the predetermined portion of the mechanical component body at which the reforming layer is formed;
• a hardness of the reforming layer is specified to be greater than a hardness of the surface of the predetermined portion of the mechanical component body and to be smaller than a hardness of the nickel plating layer, and the hardness of the reforming layer is in a range of 200 HV to 400 HV,
• wherein a concentration of nickel embedded by the fine particle shot peening process is within a range of 5 wt % to 20 wt %.