Cylinder tube and process for producing same

Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Coating selected area

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205328, C25D 704

Patent

active

054318025

ABSTRACT:
A cylinder tube comprising an aluminum tube formed on its outer surface with an outside oxide film having a hardness of not lower than 150 HV to less than 350 HV and on its inner surface with an inside oxide film having a hardness of not lower than 350 HV to not higher than 650 HV.

REFERENCES:
patent: 950777 (1910-03-01), Winslow
patent: 3065153 (1962-11-01), Hough et al.
patent: 4252620 (1981-02-01), Tomita
patent: 4606796 (1986-08-01), Hanazima et al.
Derwent Abstract of JP 0039796 (Mar. 1983) Sanko Alumi KK.
Derwent Abstract of E. German Patent DD 221761 Theodor Neubauer (May 2, 1985).
Metal Finishing Guidebook Directory 1984 vol. 82, No. 1A Metals & Plastics Publ. Inc. (1984).

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