Title:
HARD ANODIZING METHOD FOR INSIDE SURFACE OF PIPE
Document Type and Number:
Japanese Patent JPS5839796
Kind Code:
A
Abstract:
PURPOSE:To form hard anodized films uniformly on the inside surfaces of Al pipes by circulting and passing a cooled electrolyte in the bores of the pipes immersed in a treating tank from one to the other and maintaining the temp. of the electrolyte interposed on the inside surfaces of the pipes as desired. CONSTITUTION:Pipes W made of an Al alloy ae disposed upright in parallel in the electrolyte L of an anodizing tank T, and are anodized. The electrolyte L is circulated between the tank T and a heat exchanger H. The electrolyte L cooled in the heat exchanger H is discharged through the discharge ports A of discharge pipes P to the center at the bottom ends of the pipes W, flow upward in the pipes W and flow out from the top ends thereof. The heat of electrolysis generated in the inside surfaces of the pipes W is thoroughly removed, and the temp. of the electrolyte interposing in the pipes W is maintained always at a desired temp. By such method, hard anodized films are formed easily and uniformly on the inside surfaces of the Al alloy pipes.
Inventors:
HASEGAWA TETSUO
Application Number:
JP13891481A
Publication Date:
March 08, 1983
Filing Date:
September 03, 1981
Export Citation:
Assignee:
SANKO ALUMINUM KK
International Classes:
C25D11/00; C25D11/04; (IPC1-7): C25D11/04
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