Title:
PRODUCTION OF PIPE EXCELLENT IN CORROSION RESISTANCE IN OUTSIDE FACE
Document Type and Number:
Japanese Patent JP3121745
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce the generation of flaws in a pipe and to increase its high temp. oxidation resistance by using an Al alloy mixed with elements increasing its m.p. and furthermore increasing its high temp. oxidation resistance as Al-base metal.
SOLUTION: The outer circumferential face of a cast iron pipe 2 is coated with an aluminum alloy layer 1 by thermal spraying for an aluminum alloy. This is subjected to heat treatment to diffuse aluminum into the iron part 3 of the cast iron pipe 2 and to oxidize aluminum on the surface part 4. When the annealing heat treatment is completed, an iron aluminum alloy layer 5 is formed on the outer circumferential face of the iron part 3 in the cast iron pipe 2, and an aluminum oxide passive film is formed on the outer circumferential face. As the aluminum-base metal at this time, the aluminum alloy mixed with elements increasing its m.p. and also increasing its high temp. oxidation resistance such as B, Ti, Zr, Hf, Ce, Y or the like is used. Thus, the uniform iron-aluminum alloy layer can be obtd.
Inventors:
Manabu Kurotobi
Mutsuo Uchida
Hiroaki Shimizu
Mutsuo Uchida
Hiroaki Shimizu
Application Number:
JP17123395A
Publication Date:
January 09, 2001
Filing Date:
July 07, 1995
Export Citation:
Assignee:
Kubota Corporation
International Classes:
B22D13/02; C23C4/06; C23C4/18; C23C10/28; C23C10/50; C23C24/08; C23C26/00; (IPC1-7): C23C10/50; B22D13/02; C23C4/06; C23C4/18; C23C24/08; C23C26/00
Domestic Patent References:
| JP60103177A |
Attorney, Agent or Firm:
Yoshihiro Morimoto