WO2020087144A1 - Agencement structural destiné à un capteur/sonde de mesure de taux de corrosion par résistance électrique - Google Patents

Agencement structural destiné à un capteur/sonde de mesure de taux de corrosion par résistance électrique Download PDF

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Publication number
WO2020087144A1
WO2020087144A1 PCT/BR2019/050466 BR2019050466W WO2020087144A1 WO 2020087144 A1 WO2020087144 A1 WO 2020087144A1 BR 2019050466 W BR2019050466 W BR 2019050466W WO 2020087144 A1 WO2020087144 A1 WO 2020087144A1
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WO
WIPO (PCT)
Prior art keywords
corrosion
sensor
measurement
probe
electrical resistance
Prior art date
Application number
PCT/BR2019/050466
Other languages
English (en)
Portuguese (pt)
Inventor
Otavio Carneiro CORREA
Original Assignee
Vidya Corrosão Engenharia Ltda
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 Vidya Corrosão Engenharia Ltda filed Critical Vidya Corrosão Engenharia Ltda
Publication of WO2020087144A1 publication Critical patent/WO2020087144A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
    • G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
    • G01N17/04—Corrosion probes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/28—Electrolytic cell components
    • G01N27/30—Electrodes, e.g. test electrodes; Half-cells
    • G01N27/301—Reference electrodes

Definitions

  • the present utility model patent refers to the constructive arrangement introduced in a sensor or probe for measuring the corrosion rate by electrical resistance applied in the industrial field for systems with ducts, pipes and equipment in order to provide variations in corrosion rates of the system, which aims to obtain greater precision in the measurements of corrosion rates and better result in response speed, with advantages of greater measurement speed, greater measurement accuracy, greater reliability in monitoring, simplicity, sensitivity to operational changes and the flow regime, in addition, through the corrosion rate profile it is possible to act on the process variables to minimize corrosion.
  • the working principle of this type of device is based on the variation of the electrical resistance of a sensor element in function of its loss of mass caused by corrosion, compensated for the resistivity variations caused by the temperature, through a reference element.
  • the invention concerns systems and methods for monitoring and controlling corrosion in hot water systems to inhibit corrosion in the hot water system .
  • the method includes defining one or more operational protection zones in the hot water system.
  • One or more of the operational protection zones includes an oxidation potential probe - reduction that is operable to measure an oxidation potential - real-time reduction in the hot water system at operating temperature and pressure.
  • the probe transmits the measured potential in real time to the controller, which evaluates and interprets the transmitted potential to determine whether it conforms to an oxidation - reduction potential setting. If the measured potential is not in accordance with the oxidation-reduction potential setting, the controller is operable to feed or remove one or more active chemical species to the system from the hot water system and additionally operable to change at least one parameter of the system.
  • US patent 7,061,255 “Corrosion monitoring system”.
  • a system for monitoring corrosion on metal by comparing a test sample exposed to a corrosion-causing environment and a reference sample exposed to a protected environment.
  • An AC voltage source generates a square wave signal oscillating between ground and the voltage Vcc and a filter is positioned to filter the signal to produce a sine wave without a second harmonic component.
  • a voltage driven current source and an inverter amplifier produce a current referenced to 0.5 Vdc to provide an AC current of the driven voltage sinusoidally and symmetrically above and below 0.5 Vdc.
  • a transformer increases the alternating current and then transmits the current through the samples to an amplifier to amplify the current to provide outputs in a proportion that represents the degree of corrosion of the reference sample.
  • the system can operate in situ for on-site measurement and uses relatively low current to allow for long operation.
  • Thin-film ceramic thermocouples A thin-film ceramic thermocouple (10) having two ceramic thermocouples (12, 14) that are in contact with each other at at least one point to form a joint, and in which each element was prepared in a plasma other than oxygen / nitrogen / argon. Since each element is prepared under different plasma conditions, they have different electrical conductivity and different concentrations of charge carriers.
  • the thin film thermocouple (10) can be transparent.
  • a versatile ceramic sensor system with an RTD heat flow sensor can be combined with a thermocouple and a deformation sensor to produce a multifunctional ceramic sensor array.
  • the transparent ceramic temperature sensor that can be used to calibrate optical sensors.
  • [10] English patent GB2504214 “Crack corrosion sensor” A sensor for measuring corrosion under the gap of metals immersed in a fluid-containing container, the sensor comprising a cylindrical body and a length of bare metallic wire passing along and in of a groove in the body.
  • the groove can be helical and the sensor can include an inner body of a different diameter with a wire in a corresponding groove.
  • An opening to retain debris in a fluid stream can be included.
  • a method for predicting corrosion in a vessel containing fluid is also described, including the steps of providing a corrosion sensor, immersing at least part of it in the vessel and measuring the electrical resistance of the wire, and the first and second derivatives of the resistance in relation to at time.
  • the vessel can be a pipe or any part of a system that carries fluid in a building, such as heated or chilled water, a sprinkler system or any system that carries fluid, such as in a chemical installation, refinery or desalination plant.
  • Low profile electrical resistance corrosion sensor A thin, narrow electrical resistance corrosion sensor defines the measurement, reference and verification resistances as parts arranged in series of a thin metal resistance element, such as a carbon steel element or ductile iron, with metallurgical properties that combine with a corrosive structure. of interest, like a pipeline buried in the ground.
  • the resistance element is connected to a structural substrate in the thin, long and narrow conductive to which also a bundle of flat cables is attached, which includes conductors connected to the ends of the resistance element and to selected locators of the element between its ends.
  • the resistance element, the substrate, the wire harness and its connections to the resistance element are encapsulated by a non-conductive protective coating, except over the area of the measurement resistor, so that this resistor can be exposed to the surrounding environment.
  • the sensor can be used with conventional corrosion measurement instruments. Arrangements for using multiple sensors to measure corrosion due to direct current in a structure of interest, and to measure corrosion due to alternating currents in that structure, are also described.
  • Corrosion sensors are adapted to be placed in the environment containing the material of interest during the period in which corrosion is occurring.
  • Corrosion sensors include a power source, a visual indicator and an electrode contained in a support. Changes in the electrical resistance of the electrode facilitate the display on the visual indicator, including changes in color or brightness.
  • Some corrosion sensors have energy sources activated by directing a light source or other source of electromagnetic radiation to the corrosion sensor.
  • Some corrosion sensors have visual indicators containing thermochromic or electrochromic materials that respond to changes in voltage drop or current flow through the visual indicator.
  • Some corrosion sensors have tracking devices to provide tracking information about the corrosion sensor.
  • Some corrosion sensors have proximity sensors to inhibit the display of the visual indicator when they are not close to a trigger.
  • US patent US5627749 “Corrosion monitoring tool” A tool for monitoring corrosion levels within a well is particularly suitable for remote monitoring for long periods.
  • the monitoring tool uses a thin-walled electrical resistance wall corrosion sensor to determine the rate of metal loss within the well.
  • the corrosion sensor is preferably made of the same material as the production pipe or well bore pipe and is positioned to allow the fluid inside the well flows over the sensor at the same speed as the fluid flows over the pipeline.
  • a reference element is incorporated into the corrosion sensor to provide primary temperature compensation.
  • a temperature sensor provides temperature data and allows secondary temperature compensation for the corrosion sensor.
  • a central processing unit reads and stores data from the three sensors in solid-state memory. The probe records data at programmable time intervals. After recovering the probe from the well, the probe can be connected to a computer for downloading the raw data and for further analysis.
  • US patent US6946855 “Electrical resistance sensor and corrosion monitoring devices x”
  • An apparatus (1) is revealed to monitor the effect on a material exposed to a fluid and thereby monitor the effect on a section of the tube (9) to transport the fluid.
  • the apparatus includes a sensor element (51) exposed to the fluid and formed as a ring of the material coaxially mounted inside, but electrically isolated from the tube section (9). Changes in the electrical resistance of the sensor element (51) are monitored.
  • the apparatus also includes a reference element (31) electrically isolated from the tube (9), electrically connected in series to the sensor element (51) and protected from exposure to the fluid.
  • the elements can both be made of the same material as the tube (9) and, as they are contained within it, experience the same temperature and pressure variations as the tube (9). In this way, a change in the resistance of the sensor element (51) caused by corrosion / erosion by the fluid accurately indicates the degree of corrosion / erosion of the tube (9) that carries the fluid.
  • Japanese patent JPS58178246 “Corrosion monitoring probe” OBJECTIVE To locate the flow current distribution within a pit and to know the corrosion rate or its polarization resistance to detect local corrosion progressing under the probe, through the constitution of a special shaped probe by some electrodes. CONSTITUTION: It is necessary that the surface area of an opposite insoluble electrode 2 be greater than at least one corrosion or similar to be measured. It is desirable to select the surface area of the paired electrode to be not less than 10 cm2, since a cavity to be measured has a maximum diameter of about 3 cm.
  • a paired electrode chamber 3 in an electrical insulating container 1 is desirably a container with a volume of not less than 60 ml.
  • a 4 minute hole is provided on the surface of the container wall corresponding to the paired electrode.
  • the reduction of the minimum diameter of 4 in diameter makes it possible to obtain an excellent resolving power.
  • the diameter is preferably 0.05-1 mm. in consideration of practicality.
  • any material can be used, as long as it is stable in seawater and in another environment.
  • the performance of a corrosion speed monitoring according to the polarization resistance method by using this probe makes it possible to directly detect corrosion in a structure corroded by sea water or other liquid.
  • FIGURE 1 which shows the side view of the electrodes together with the polymer film between them;
  • FIGURE 2. which shows the perspective view of the two separate electrodes and the polymer film
  • FIGURE 3. which represents the operation of the circuit, with the electrodes connected in the way they are arranged in the patent.
  • the invention of the present patent consists of two electrodes of the same material and similar geometries, which will be overlaid with a thin layer of polymer between them.
  • the reference electrode provides the data as parameters for the measurement of corrosion, in the system in question.
  • the corrosion detection electrode will be subject to corrosion thereby generating a resistance difference in relation to the reference electrode which will not suffer corrosion, thus giving the expected results.
  • the invention consists of a reference electrode (2) of optimized shape; corrosion detection electrode (1) with an optimized shape similar to the electrode (2); insulating layer (3) in polymer for example (PTFE, PoliTetraFluorEtilene, or Teflon) with volumetric electrical resistivity of at least 1.0E + 18 (I, OcIO 18 ) ohm.cm and with thermal conductivity of at least 0.2W / mK of the same geometric shape as the electrodes, with a maximum thickness of 200pm.
  • PTFE PoliTetraFluorEtilene, or Teflon

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  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Environmental Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

Le présent brevet de modèle d'utilité concerne un agencement structural destiné à un capteur ou une sonde de mesure de taux de corrosion par résistance électrique, trouvant une application dans le domaine industriel des systèmes avec conduits, tubulures et équipements, visant à obtenir une plus grande précision dans les mesures des taux de corrosion et un meilleur résultat dans la vitesse de réponse, faisant intervenir une électrode de corrosion (1) et une électrode de référence (2) constituées d'un matériau identique et présentant des géométries similaires, lesquelles sont superposées avec une fine couche isolante (3) de polymère entre celles-ci, l'avantage consistant en une vitesse de mesure plus importante, une plus grande précision de mesure, une meilleure fiabilité en termes de surveillance, la simplicité, la sensibilité aux changements fonctionnels et au régime du flux, le profil de taux de corrosion permettant en outre d'agir sur les variables du processus de façon à réduire au minimum la corrosion.
PCT/BR2019/050466 2018-10-29 2019-10-28 Agencement structural destiné à un capteur/sonde de mesure de taux de corrosion par résistance électrique WO2020087144A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BR202018072291-9U BR202018072291U2 (pt) 2018-10-29 2018-10-29 Disposição construtiva introduzida em sensor/sonda de medição de taxa de corrosão por resistência elétrica
BRBR2020180722919 2018-10-29

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WO2020087144A1 true WO2020087144A1 (fr) 2020-05-07

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220092041A (ko) * 2020-12-24 2022-07-01 한국항공우주연구원 녹 검사 장치

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1064485A (en) * 1964-03-12 1967-04-05 Pure Oil Co Corrosion rate measuring apparatus and method
JP2005024401A (ja) * 2003-07-02 2005-01-27 Katayama Chem Works Co Ltd 腐食測定装置
JP2010060497A (ja) * 2008-09-05 2010-03-18 Kawasaki Heavy Ind Ltd 腐食モニタリングセンサ
KR20120029303A (ko) * 2010-09-16 2012-03-26 조은주 박막 센서를 이용한 콘크리트 부식 손상 측정용 부식탐지기 및 시스템, 이를 이용한 측정 방법
CN204758463U (zh) * 2015-06-30 2015-11-11 天津大学 一种用于金属土壤腐蚀电化学系统的半固态参比电极
WO2015200899A1 (fr) * 2014-06-26 2015-12-30 Analatom Incorporated Capteurs souples de résistance de polarisation linéaire, et procédés concernant une structure composée d'une ou plusieurs électrodes de travail
CN105301294A (zh) * 2015-09-24 2016-02-03 苏州市铂瑞工业材料科技有限公司 一种钛阳极寿命测试夹具
CN205620285U (zh) * 2016-05-16 2016-10-05 贵州大学 基于电化学反应样品在光照条件下单面被腐蚀的实验装置

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1064485A (en) * 1964-03-12 1967-04-05 Pure Oil Co Corrosion rate measuring apparatus and method
JP2005024401A (ja) * 2003-07-02 2005-01-27 Katayama Chem Works Co Ltd 腐食測定装置
JP2010060497A (ja) * 2008-09-05 2010-03-18 Kawasaki Heavy Ind Ltd 腐食モニタリングセンサ
KR20120029303A (ko) * 2010-09-16 2012-03-26 조은주 박막 센서를 이용한 콘크리트 부식 손상 측정용 부식탐지기 및 시스템, 이를 이용한 측정 방법
WO2015200899A1 (fr) * 2014-06-26 2015-12-30 Analatom Incorporated Capteurs souples de résistance de polarisation linéaire, et procédés concernant une structure composée d'une ou plusieurs électrodes de travail
CN204758463U (zh) * 2015-06-30 2015-11-11 天津大学 一种用于金属土壤腐蚀电化学系统的半固态参比电极
CN105301294A (zh) * 2015-09-24 2016-02-03 苏州市铂瑞工业材料科技有限公司 一种钛阳极寿命测试夹具
CN205620285U (zh) * 2016-05-16 2016-10-05 贵州大学 基于电化学反应样品在光照条件下单面被腐蚀的实验装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220092041A (ko) * 2020-12-24 2022-07-01 한국항공우주연구원 녹 검사 장치
KR102556177B1 (ko) * 2020-12-24 2023-07-18 한국항공우주연구원 녹 검사 장치

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