CORROSION PREVENTION METHOD FOR STEEL STRUCTURE, AND ANODE FOR FORMING ELECTRODEPOSITED COATING

• Main Authors: SUZUKI YASUTSUNE, AKAMINE KENICHI
• Format: Patent
• Language: English
• Published: 10.09.2009
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; EMBANKMENTS; EXCAVATIONS; FIXED CONSTRUCTIONS; FOUNDATIONS; HYDRAULIC ENGINEERING; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25; NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; SOIL SHIFTING; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; UNDERGROUND OR UNDERWATER STRUCTURES

PROBLEM TO BE SOLVED: To form an electrodeposited coating preventing corrosion of a steel structure in seawater without using an external power source. SOLUTION: An anode 12 for forming an electrodeposited coating is fitted to the part of a steel pipe pile 2 sunk into seawater. The anode 12 for forming an electrodeposited coating is composed of a metal lump 14 essentially composed of magnesium and a core material 13 electrically connected to the steel pipe pile 2. Since a potential difference between magnesium and iron is wide, a large quantity of electrons e are released toward the steel pipe pile 2 from the metal lump 14 in the anode 12 for forming an electrodeposited coating with seawater as an electrolytic solution in a real sea area 3, and reduction reaction between the electrons and oxygen and electrolysis reaction of water are caused so as to generate hydroxide ions. Then, by the hydroxide ions, and, calcium ions, magnesium ions and hydrogen carbonate ions contained in the seawater, an electrodeposited coating composed of calcium carbonate and magnesium hydroxide is formed at the site of the steel pipe pile 2 sunk into the real sea area 3. COPYRIGHT: (C)2009,JPO&INPIT