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1. EP1337688 - DOUBLY-PROTECTED REINFORCING MEMBERS IN CONCRETE

Office
European Patent Office
Application Number 01973226
Application Date 19.09.2001
Publication Number 1337688
Publication Date 27.08.2003
Publication Kind A4
IPC
C23F 13/02
CCHEMISTRY; METALLURGY
23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
FNON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACES; INHIBITING CORROSION OF METALLIC MATERIAL; INHIBITING INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25247
13Inhibiting corrosion of metals by anodic or cathodic protection
02cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
C23F 13/00
CCHEMISTRY; METALLURGY
23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
FNON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACES; INHIBITING CORROSION OF METALLIC MATERIAL; INHIBITING INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25247
13Inhibiting corrosion of metals by anodic or cathodic protection
C23F 13/04
CCHEMISTRY; METALLURGY
23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
FNON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACES; INHIBITING CORROSION OF METALLIC MATERIAL; INHIBITING INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25247
13Inhibiting corrosion of metals by anodic or cathodic protection
02cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
04Controlling or regulating desired parameters
C23F 13/08
CCHEMISTRY; METALLURGY
23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
FNON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACES; INHIBITING CORROSION OF METALLIC MATERIAL; INHIBITING INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25247
13Inhibiting corrosion of metals by anodic or cathodic protection
02cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
06Constructional parts, or assemblies of cathodic-protection apparatus
08Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
G01N 17/02
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
17Investigating resistance of materials to the weather, to corrosion or to light
02Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
C23F 13/10
CCHEMISTRY; METALLURGY
23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
FNON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACES; INHIBITING CORROSION OF METALLIC MATERIAL; INHIBITING INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25247
13Inhibiting corrosion of metals by anodic or cathodic protection
02cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
06Constructional parts, or assemblies of cathodic-protection apparatus
08Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
10Electrodes characterised by the structure
CPC
G01N 17/02
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
17Investigating resistance of materials to the weather, to corrosion, or to light
02Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
C23F 13/04
CCHEMISTRY; METALLURGY
23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
FNON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE
13Inhibiting corrosion of metals by anodic or cathodic protection
02cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
04Controlling or regulating desired parameters
C23F 2201/02
CCHEMISTRY; METALLURGY
23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
FNON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE
2201Type of materials to be protected by cathodic protection
02Concrete, e.g. reinforced
Applicants NORTHERN TECHNOLOGIES INTERNAT
Inventors EFIM YA LYUBLINSKI
Priority Data 0129350 19.09.2001 US
09663958 19.09.2000 US
Title
(DE) DOPPELT GESCHÜTZTE BEWEHRUNGSELEMENTE IN BETON
(EN) DOUBLY-PROTECTED REINFORCING MEMBERS IN CONCRETE
(FR) ELEMENTS D'ARMATURE DOUBLEMENT PROTEGES DANS DU BETON
Abstract
(EN)
A concrete structure (11) is reinforced with steel rebars (12) coated with essentially pure aluminum (15) upon which aluminum coating is an aluminum oxide layer (15'). This layer of aluminum oxide is in direct contact with the concrete. The Al-coated rebars may be protected in a galvanic circuit using magnesium or other metal baser as a sacrificial anode, or the rebars are cathodically protected with an impressed cathodic current, the current density of which is derived by sensing the corrosion potential at a sensing member of essentially pure aluminum embedded in the concrete, or in concrete outside a zone immediately surrounding the rebars, measuring the corrosion potential at the sensing member relative to a reference electrode until the value stabilizes at a measured stable potential; then an impressed current lower than the corrosion potential of the sensing member is imposed.

(FR)
On renforce une structure en béton (11) avec des barres d'armature en acier (12) recouvertes essentiellement d'aluminium pur, (15) sur lequel se trouve une couche d'oxyde d'aluminium (15'). Cette couche est en contact direct avec le béton. On peut protéger les barres d'armature en aluminium dans un circuit galvanique en utilisant du magnésium ou toute autre base métallique telle qu'une anode sacrificielle ou on protège les barres d'armature sur le plan cathodique avec un courant interposé. Pour dériver la densité de ce courant, on détecte le potentiel de corrosion au niveau de l'élément de détection d'aluminium pratiquement pur enveloppé dans le béton ou dans du béton à l'extérieur d'une zone entourant lesdites barres, on mesure le potentiel de corrosion au niveau de l'élément de détection en fonction d'une électrode de référence, jusqu'à ce que la valeur se stabilise à un potentiel stable mesuré, puis, on impose un courant interposé plus faible que celui du potentiel de corrosion dudit élément de détection.