C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 18/08 (2006.01) B32B 15/01 (2006.01) C21D 9/02 (2006.01) C23C 18/16 (2006.01) C23C 26/00 (2006.01) F16F 1/02 (2006.01) F16F 1/04 (2006.01)
Patent
CA 2121392
A steel material for coloured springs is formed with a metallic deposit on the surface. The metallic deposit contains copper, zinc, and chromium. In an annealing process, copper and zinc diffuse in the deposit to exhibit a gold colour tone while chromium is oxidized to exhibit a dark gray colour tone. The combination of these colour tones exhibits a beautiful black colour tone which is distinguishable from a normal spring. The deposit improves the formability in the spring shaping process.
Hattori Keiji
Kubo Takashi
Ueki Hirofumi
Yamada Masao
Hattori Keiji
Kubo Takashi
Marks & Clerk
Shinko Kosen Kogyo Kabushiki Kaisha
Ueki Hirofumi
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