抄録
The purpose of the present experiment was to obtain a good fusion zone between insert and aluminium alloy castings by the surface treatment of the insert.
The experiments were made on the alloys subjected to three kinds of treatments, which had given relatively good results in the pre-experiments; copper plating, nickel plating, aluminizing treatment, and no treatment for comparison.
Besides the above treatments, preheating was conducted to make the fusion easily on the insert and heat treatment was made for diffusion. Flux was used for removing oxide film.
The following results were obtained.
1) Good fusion zone was not obtained by casting with electroplated insert and preheated metallic mold.
2) The adhesion of the insert on the alloys was not improved by heat treatment after casting.
3) Good adherent surface was obtained by casting after the treatment of nickel plating on soft steel (S 20 C) bar and then dipping it in the flux consisting of 60% ZnCl2 and 40% NaCl.
4) Mechanical strength was improved by designing the shapes of inserts.
