Improvement of Tarnish-Resistance in Aluminium Bronze A Study on the Wrought Imitation Gold

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  • アルミニウム青銅の耐変色性の改良について加工用黄金色合金の研究
  • アルミニウム セイドウ ノ タイヘンショクセイ ノ カイリョウ ニ ツイテ カコウヨウ コガネイロ ゴウキン ノ ケンキュウ

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The authors prepared various specimens of aluminium bronze containing other elements and examined their workability, tarnish-resistance, colours and mechanical properties for the purpose of discovering the excellent wrought imitation gold that is of low cost and has high tarnish-resistance. Especially as to tarnish-resistance, examination were carried out such as dipping test in NaCl, soap, acid and alkaline aqueous solution, exposure test in outdoor and ring test in the form of finger ring.<br>In various examinations, the following two alloys of Cu-Al-Ni-Mn system showed excellent result as compared with Tombac and binary aluminium bronze. They are No. 116 alloys (4%Al, 2%Ni, 1%Mn) and No. 102 alloy (4.5%Al, 1%Ni, 2%Mn).

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