METHOD OF FORMING ANTICORROSION COATING - ISHIKAWAJIMA HARIMA HEAVY IND

Title:

METHOD OF FORMING ANTICORROSION COATING

Document Type and Number:

WIPO Patent Application WO/2005/108645

Kind Code:

A1

Abstract:

Forming of an anticorrosion coating at low cost within a short period of time to thereby facilitate application to general-purpose marine steel structures. There is provided a method of forming an anticorrosion coating, comprising providing steel caisson (1) as a negative electrode and undersea member (3) set in seawater opposite to the steel caisson (1) as a positive electrode and passing a direct current therebetween so as to induce an electrolytic reaction of seawater to thereby form anticorrosion coating (8) on the steel caisson (1) and thus attain corrosion prevention, wherein the current is passed between the electrodes at a current density realizing formation of coating (7) composed mainly of magnesium hydroxide on the steel caisson (1) to thereby produce coating (7) of given thickness, and thereafter the supply of the current is discontinued so as to induce a composition replacement action attaining replacement of the magnesium hydroxide produced in the presence of seawater by calcium carbonate, thereby producing the anticorrosion coating (8).

Inventors:

AKAMINE KENICHI (JP)
SUZUKI YASUNOBU (JP)

Application Number:

PCT/JP2005/008133

Publication Date:

November 17, 2005

Filing Date:

April 28, 2005

Export Citation:

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Assignee:

ISHIKAWAJIMA HARIMA HEAVY IND (JP)
AKAMINE KENICHI (JP)
SUZUKI YASUNOBU (JP)

International Classes:

E02D31/06; C23F15/00; C25D9/10; E02D5/64; (IPC1-7): C23F15/00; C25D9/10; E02D31/06

Foreign References:

JPH0666767A	1994-03-11
JPS61261499A	1986-11-19
JPH10313728A	1998-12-02

Other References: