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

Abstract

A mechanical component for an internal combustion engine includes a mechanical component body made of one of aluminum and aluminum alloy and used for the internal combustion engine, a nickel plating layer formed to cover a surface of a predetermined portion of the mechanical component body, and a reforming layer formed between the surface of the predetermined portion of the mechanical component body and the nickel plating layer.

1 . A mechanical component for an internal combustion engine, comprising:
 a mechanical component body made of one of aluminum and aluminum alloy and used for the internal combustion engine;   a nickel plating layer formed to cover a surface of a predetermined portion of the mechanical component body; and   a reforming layer formed between the surface of the predetermined portion of the mechanical component body and the nickel plating layer.   
     
     
         2 . The mechanical component according to  claim 1 , wherein 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. 
     
     
         3 . The mechanical component according to  claim 1 , wherein a surface of the reforming layer facing the nickel plating layer includes a concavoconvex form. 
     
     
         4 . The mechanical component according to  claim 1 , wherein the reforming layer includes nickel. 
     
     
         5 . The mechanical component according to  claim 4 , wherein a concentration of nickel included in the reforming layer is specified to be smaller than a concentration of nickel included in the nickel plating layer. 
     
     
         6 . The mechanical component according to  claim 1 , wherein the mechanical component body at which the reforming layer is formed includes a piston body and the surface of the predetermined portion of the mechanical component body includes a top surface of the piston body. 
     
     
         7 . The mechanical component according to  claim 1 , wherein the nickel plating layer is formed to contact with a surface of the reforming layer facing the nickel plating layer. 
     
     
         8 . A manufacturing method of a mechanical component for an internal combustion engine, the manufacturing method comprising steps of:
 forming a reforming layer on a surface of a predetermined portion of a mechanical component body that is made of one of aluminum and aluminum alloy by a shot peening process performed on the surface of the predetermined portion of the mechanical component body; 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.   
     
     
         9 . The manufacturing method according to  claim 8 , wherein the step of forming the reforming layer includes a step of forming the reforming layer that includes nickel and a concave-convex form on the surface of the predetermined portion of the mechanical component body by a fine particle shot peening process utilizing nickel and performed on the surface of the predetermined portion of the mechanical component body. 
     
     
         10 . The manufacturing method according to  claim 8 , wherein 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. 
     
     
         11 . A mechanical component comprising:
 a mechanical component body made of one of aluminum and aluminum alloy;   a nickel plating layer formed to cover a surface of a predetermined portion of the mechanical component body; and   a reforming layer formed between the surface of the predetermined portion of the mechanical component body and the nickel plating layer.