WO2018145178A1 - Protection électronique de structures métalliques contre la corrosion - Google Patents

Protection électronique de structures métalliques contre la corrosion Download PDF

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Publication number
WO2018145178A1
WO2018145178A1 PCT/BR2017/050201 BR2017050201W WO2018145178A1 WO 2018145178 A1 WO2018145178 A1 WO 2018145178A1 BR 2017050201 W BR2017050201 W BR 2017050201W WO 2018145178 A1 WO2018145178 A1 WO 2018145178A1
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WO
WIPO (PCT)
Prior art keywords
metal
electronic
structures
protection
anode
Prior art date
Application number
PCT/BR2017/050201
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English (en)
Portuguese (pt)
Inventor
Paulo Fernando GRACIADIO
Original Assignee
Graciadio Paulo Fernando
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Graciadio Paulo Fernando filed Critical Graciadio Paulo Fernando
Publication of WO2018145178A1 publication Critical patent/WO2018145178A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING 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
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR 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 C25
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
    • C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus

Definitions

  • the invention focuses on protecting against corrosive processes the structures (painted or unpainted) composed of metals and / or metal alloys, which may be of the standard type (such as motor vehicles, agricultural machinery, vessels, railings, railings, gates and appliances) or of a non-standard type (such as: various industrial metal structures, special purpose machinery and piping).
  • These structures may be exposed to different corrosive means, both natural (eg: atmospheres with salt or sulfur gases, salt or fresh water and soils), and anthropogenic (eg urban and industrial atmospheres, soils and contaminated waters).
  • Modify the structure operating medium Modify the structure operating medium to control the nature of corrosive substances in the structure;
  • Modify the electrochemical potential of the metal structure Apply energy to the structure or its environment in order to energetically stabilize the atoms of the metal or alloy, reducing or nullifying their tendency to donate electrons in the medium.
  • the choice of the most suitable anticorrosive method in each case is always based on the characteristics of the corrosive process that is taking place and, mainly, on the cost-benefit ratio of the method to be employed.
  • Barrier protection Anticorrosive coatings are usually applied to prevent corrosive substances from reaching the metal surface. For this reason, the protection mechanism of the coatings is also called barrier protection. This coating can be a paint, oxide or metallic coating.
  • Industrial paint is a coating widely used mainly for the protection of metal structures subject to the corrosive action of the atmosphere;
  • Cathodic Protection If an area of the metal structure is corroded, it has an anodic electrochemical behavior in relation to its environment. Cathodic protection consists in modifying the electrochemical potential of the metal structure, shifting it to a more energy-friendly situation, ie to a cathodic electrochemical potential, in relation to the environment.
  • cathodic protection can be accomplished by printed current or sacrificial anode, depending on the electrical conductivity of the medium where the structure operates. In sufficiently conductive media the use of sacrificial anodes is possible, whereas in low electrical conductivity means only cathodic protection by printed current is feasible.
  • a typical conventional printed current cathodic protection installation requires at least three elements: rectifiers, anode bed and conductors electric; conventional cathode sacrificial anode protection eliminates the need for rectifiers.
  • the degree and durability of the protection provided by a coating depends mainly on the quality of the coating's adhesion to the metal surface, its thickness and permeability to the corrosive elements in the medium.
  • paint coatings require periodic maintenance, they are used for submerged structures (vessels, floats, etc.), provided that these structures can be periodically removed from water for painting maintenance and for buried structures only in exceptional cases (due to the difficulty maintenance these structures have).
  • Paints also have the drawback that they are difficult to apply to structures with irregular geometry such as those with cracks, hollow parts, or hard-to-reach parts.
  • the anodes should be welded to 1/8 "rebar pieces and placed into the 1/2" PVC pipes and after preparation of the assembly, the anodes should be welded to each end of the pipe.
  • the anti-corrosion protection system through cathodic protection allows to extend the service life of central pivots used in irrigation through the application of anti-corrosion protection characterized by the corrosion-fighting method that consists of the transformation of the structure to protect the cathode of a cell. electrochemical or electrolytic.
  • WATER describes an anode for cathodic protection of underwater equipment comprising: a support body; sacrificial material retained by the support body; and securing means for releasably securing the anode to the apparatus. Therefore, recent prior art documents confirm the cited prior art.
  • the invention deals with a new form of corrosion protection called Electronic Anode Cathodic Protection, which also works by modifying the electrochemical potential of the metal structure to cathode values relative to its environment, as well as conventional cathodic protection techniques (eg sacrificial anode and printed current).
  • metallic corrosion is the inverse process of the steelmaking process, since, upon corrosion, the metal makes successive chemical combinations with elements of its environment, until it returns to its ore state, returning to nature. the energy it has stored in the steelmaking process. This process of energy decay is spontaneous, since everything in nature seeks the state of least energy.
  • an important aspect to consider with regard to anti-corrosion methods relates to the conservation of ore reserves.
  • Corrosive processes occur in various sectors, such as chemical, petroleum, petrochemical, marine, construction, automotive, aeronautics, rail, telecommunications, etc.
  • Direct losses include the costs of replacing degraded parts or equipment, including the labor and energy required for such replacement, and include costs related to the operations required to prevent corrosive processes from occurring.
  • Indirect losses are more difficult to account for because they include often imponderable externalities, but can achieve much higher costs and environmental impacts than direct losses.
  • Examples of indirect losses include:
  • Modify the structure operating medium Modify the structure operating medium to control the nature of corrosive substances in the structure;
  • Modify the electrochemical potential of the metal structure Apply energy to the structure or its environment to energetically stabilize the atoms of the metal or alloy, reducing or nullifying their tendency to donate electrons in the medium.
  • the choice of the most suitable anticorrosive method in each case is always based on the characteristics of the corrosive process that is taking place and, mainly, on the cost-benefit ratio of the method to be employed.
  • Barrier protection Anticorrosive coatings are usually applied to prevent corrosive substances from reaching the metal surface. For this reason, the protection mechanism of the coatings is also called barrier protection. This coating can be a paint, oxide or metallic coating.
  • Industrial paint is a coating widely used mainly for the protection of metal structures subject to the corrosive action of the atmosphere.
  • Cathodic Protection If an area of the metal structure is corroded, it has an anodic electrochemical behavior in relation to its environment. Cathodic protection consists in modifying the electrochemical potential of the metal structure, shifting it to a more energy-friendly situation, ie to a cathodic electrochemical potential, in relation to the environment.
  • cathodic protection can be accomplished by printed current or sacrificial anode, depending on the electrical conductivity of the medium where the structure operates. In sufficiently conductive media the use of sacrificial anodes is possible, whereas in low electrical conductivity means only cathodic protection by printed current is feasible.
  • a typical conventional printed current cathodic protection installation requires at least three elements: rectifiers, anode bed and electrical conductors; conventional sacrificial anode cathode protection eliminates the need for rectifiers as shown in Figure 2A.
  • the action of the Electronic Anode consists in maintaining an excess of electrons in the metal structure to be protected. This excess of electrons basically performs three distinct functions that together contribute to significantly reduce or even nullify the speed of corrosive processes:
  • a metal structure has different regions that present differences in electrochemical potential which, depending on the characteristics of the environment, may result in corrosive processes.
  • the excess electrons provided by the Electronic Anode contribute to leveling the electrochemical potentials of the different regions of the structure, reducing the differences between these potentials, eliminating the possibility of corrosion;
  • the invention describes an Electronic Anode Cathodic Protection based on an electronic circuit, called an Electronic Anode, designed specifically to stop evolving corrosive processes and also prevent new processes from settling into structures made up of virtually any metal or alloy.
  • the Electronic Anode can be adapted and installed in the most different metal structures, exposed to the most corrosive means: atmospheric, buried, submerged and in the most aggressive conditions that occurs in the industrial sector.
  • the action of the Electronic Anode consists in maintaining an excess of electrons in the metal structure to be protected. This excess of electrons basically performs three distinct functions that together contribute to significantly reduce or even nullify the speed of corrosive processes.
  • FIGURE 1 Overview showing the steelmaking and corrosion processes in energy terms
  • FIGURE 2 Schematic drawing of conventional sacrificial anode cathodic protection
  • FIGURE 3 Schematic drawing of conventional printed current cathodic protection
  • FIGURE 4 Schematic drawing of cathode protection by electronic anode
  • FIGURE 5 Perspective overview illustrating one embodiment of electronic anode cathodic protection. DESCRIPTION OF THE INVENTION
  • ELECTRONIC PROTECTION OF METAL STRUCTURES AGAINST CORROSION comprises an electronic anode based on an electronic circuit, called an electronic anode (1), specifically designed to paralyze evolving corrosive processes. Also prevent new processes from settling into structures made up of virtually any metal or alloy.
  • the electronic anode (1) can be adapted and installed in the most different metal structures (E), exposed to the most varied corrosive means: atmospheric, buried, submerged and in the most aggressive conditions that occurs in the industrial sector.
  • the electronic anode (1) is coupled to a metal structure (E), showing the direction of the electronic current through the arrow (S).
  • the action of the electronic anode (1) consists in maintaining an excess of electrons in the metal structure (E) to be protected.
  • This excess of electrons basically performs three distinct functions that together contribute to significantly reduce or even nullify the speed of corrosive processes.
  • a box (1 B) houses electron-producing electronic boards, while yellow wires (2) are electron-emitting and black (3) is the earth of the electronic board.
  • yellow wires (2) are electron-emitting
  • black (3) is the earth of the electronic board.
  • metal alloys in general under different circumstances of use and operations, are kept isolated from oxidation. while operating the protection; whereas structures (E) already affected by oxidation may form protective layers that prevent the intensification of the oxidation layer.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Prevention Of Electric Corrosion (AREA)

Abstract

L'invention comprend une anode électronique (1) pour arrêter les processus corrosifs en évolution et également éviter que de nouveaux processus débutent sur des structures constituées de pratiquement tout type de métal ou d'alliage métallique, cette anode électronique (1) étant accouplée à une structure métallique (E), avec circulation de courant électronique selon la flèche (S). L'invention vise à protéger contre les processus corrosifs les structures (peintes ou non), constituées de métaux et/ou d'alliages métalliques, pouvant être du type normalisées (telles que : véhicules automobiles, engins agricoles, bateaux, barrières, balustrades, portails et appareils électroménagers) ou du type non normalisées (telles que : structures métalliques industrielles diverses, machines à usages spécifiques et tubulures). Ces structures peuvent être exposées aux différents milieux corrosifs, tant naturels (par exemple : atmosphères chargées en sel ou en gaz sulfureux, eau salée ou douce et sols), qu'anthropogènes (par exemple : atmosphères urbaines et industrielles, sols et eaux polluées).
PCT/BR2017/050201 2017-02-07 2017-07-20 Protection électronique de structures métalliques contre la corrosion WO2018145178A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BR102017002460 2017-02-07
BRBR1020170024601 2017-02-07

Publications (1)

Publication Number Publication Date
WO2018145178A1 true WO2018145178A1 (fr) 2018-08-16

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WO (1) WO2018145178A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2851414A (en) * 1954-05-03 1958-09-09 Chance Co Ab Anode for cathodic protection of guy rods and anchors
US2893939A (en) * 1957-08-21 1959-07-07 Phillips Petroleum Co Cathodic protection system
BR9900692A (pt) * 1999-03-08 2000-10-17 Bhar Comercio E Representacoee Sistema eletrônico para proteção contra corrosão de estruturas metálicas
CN2828064Y (zh) * 2005-10-13 2006-10-18 佛山市顺德区宏兴实业有限公司 一种新型电子防腐蚀装置
CN202131373U (zh) * 2011-07-08 2012-02-01 德州学院 热水器内胆的外加电流阴极保护装置
CN204240601U (zh) * 2014-07-23 2015-04-01 尹晓鹏 一种电子阳极结构和电热水器
BR102014012793A2 (pt) * 2014-05-27 2015-12-22 Paulo Fernando Graciadio equipamento eletrônico anticorrosão para conjuntos metálicos

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2851414A (en) * 1954-05-03 1958-09-09 Chance Co Ab Anode for cathodic protection of guy rods and anchors
US2893939A (en) * 1957-08-21 1959-07-07 Phillips Petroleum Co Cathodic protection system
BR9900692A (pt) * 1999-03-08 2000-10-17 Bhar Comercio E Representacoee Sistema eletrônico para proteção contra corrosão de estruturas metálicas
CN2828064Y (zh) * 2005-10-13 2006-10-18 佛山市顺德区宏兴实业有限公司 一种新型电子防腐蚀装置
CN202131373U (zh) * 2011-07-08 2012-02-01 德州学院 热水器内胆的外加电流阴极保护装置
BR102014012793A2 (pt) * 2014-05-27 2015-12-22 Paulo Fernando Graciadio equipamento eletrônico anticorrosão para conjuntos metálicos
CN204240601U (zh) * 2014-07-23 2015-04-01 尹晓鹏 一种电子阳极结构和电热水器

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