<p>A technique for using an iron plating for coating an aluminum product that results in adequate durability. An aluminum piston (l?) used as a plated aluminum product is covered by an iron-based composite plating layer (l l). The iron-based composite plating layer (ll) contains a carbon nanomaterial, which is applied to the aluminum-based base material using a iron-based composite plating bath formed by mixing a carbon nanomaterial into an iron plating bath.</p>
