WO2022244225A1 - 腐食推定装置および方法 - Google Patents
腐食推定装置および方法 Download PDFInfo
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- WO2022244225A1 WO2022244225A1 PCT/JP2021/019333 JP2021019333W WO2022244225A1 WO 2022244225 A1 WO2022244225 A1 WO 2022244225A1 JP 2021019333 W JP2021019333 W JP 2021019333W WO 2022244225 A1 WO2022244225 A1 WO 2022244225A1
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- 230000007797 corrosion Effects 0.000 title claims abstract description 119
- 238000005260 corrosion Methods 0.000 title claims abstract description 119
- 238000000034 method Methods 0.000 title claims description 15
- 239000002689 soil Substances 0.000 claims abstract description 48
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 33
- 239000001301 oxygen Substances 0.000 claims abstract description 33
- 239000002184 metal Substances 0.000 claims abstract description 31
- 229910052751 metal Inorganic materials 0.000 claims abstract description 31
- 239000002245 particle Substances 0.000 claims abstract description 20
- 230000006866 deterioration Effects 0.000 description 12
- 238000005259 measurement Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000009792 diffusion process Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000002848 electrochemical method Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000011179 visual inspection Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
-
- 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
-
- 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
Definitions
- the present invention relates to a corrosion estimation device and method for estimating corrosion of structures buried in the ground.
- infrastructure facilities There are many types and numbers of infrastructure facilities that support our lives. In addition, infrastructure facilities are exposed to various environments, not only in urban areas, but also in mountainous areas, coastal areas, hot spring areas, cold areas, and even underwater and underground. . In order to maintain infrastructure facilities with these characteristics, it is necessary to grasp the current state of deterioration through visual inspections.
- Non Patent Document 1 Non-Patent Document 2, Non-Patent Document 3
- it is a deterioration state near the ground it is possible to visually inspect or directly measure it, but it is impossible to confirm the deterioration state of the part hidden in the soil by visual inspection. For this reason, it is difficult to perform efficient maintenance of underground equipment according to the state of deterioration.
- the former method causes high costs especially when there are a large number of target facilities, and it is difficult to repair and replace sensors after they are buried.
- the latter method when the object is to be buried in a deep location, it is necessary to bury the object deep in the ground by excavation or the like. As described above, it is difficult for the conventional method to simply and inexpensively grasp the deterioration state of underground facilities.
- the present invention was made in order to solve the above-mentioned problems, and the object of the present invention is to make it possible to easily and inexpensively inspect the state of deterioration of underground metal facilities.
- the corrosion estimation method includes a first step of estimating the relationship between the soil depth of the land and the oxygen concentration in the soil based on the particle size of the soil of the target land; Based on the corrosion rate or corrosion amount of the metal and the relationship estimated in the first step, from the relationship between the oxygen concentration and the corrosion rate or corrosion amount, the relationship between the underground depth and the corrosion rate or corrosion amount in the land and a second step of estimating.
- the corrosion estimating apparatus includes a first estimating function unit for estimating the relationship between the soil depth of the land and the oxygen concentration in the soil based on the particle size of the soil of the target land; Based on the corrosion rate or corrosion amount of the target metal in the vicinity and the relationship estimated by the first estimation function unit, from the relationship between the oxygen concentration and the corrosion rate or corrosion amount, the underground depth in the land and the corrosion rate or and a second estimation function unit for estimating the relationship with the corrosion amount.
- the relationship between the underground depth and the corrosion rate or the amount of corrosion in the land is estimated, so the deterioration state of underground metal facilities can be inspected simply and inexpensively.
- FIG. 1 is a configuration diagram showing the configuration of a corrosion estimation device according to an embodiment of the present invention.
- FIG. 2 is a flow chart explaining the corrosion estimation method according to the embodiment of the present invention.
- FIG. 3 is a configuration diagram showing the hardware configuration of the corrosion estimation device according to the embodiment of the present invention.
- FIG. 4 is an explanatory diagram showing an image of estimation using the corrosion estimation device 100 according to the embodiment of the present invention.
- FIG. 5 is a distribution diagram showing the distribution of particle sizes of soil.
- FIG. 6 is a characteristic diagram showing the relationship between the underground depth and the oxygen concentration in the soil.
- FIG. 7 is a characteristic diagram showing the relationship between oxygen concentration and corrosion rate or corrosion amount.
- FIG. 8 is a characteristic diagram showing the relationship between underground depth and corrosion rate or corrosion amount.
- This corrosion estimating device includes a first estimating function unit 101 , a second estimating function unit 102 , a storage unit 104 and a display unit 105 .
- the first estimation function unit 101 estimates the relationship between the underground depth of the land and the oxygen concentration in the soil based on the particle size of the soil of the target land.
- the second estimating function unit 102 calculates the relationship between the oxygen concentration and the corrosion rate or the corrosion amount based on the corrosion rate or the corrosion amount of the target metal near the surface of the land and the relationship estimated by the first estimating function unit 101. From the relationship, we deduce the relationship between subsurface depth and corrosion rate or amount in the land.
- the corrosion rate or corrosion amount of the target metal near the ground surface of the target land and the particle size of the soil of the land can be acquired in advance and stored in the storage unit 104 .
- the relationship between the oxygen concentration and the corrosion rate or corrosion amount can be stored in the storage unit 104 .
- the corrosion estimating apparatus estimates the corrosion state of the structure made of metal buried in the target ground on the land from the relationship estimated by the second estimating function unit 102.
- An estimation function unit 103 is provided.
- the estimated corrosion state is displayed on the display unit 105, for example.
- the first estimation function unit 101 estimates the relationship between the underground depth of the land and the oxygen concentration in the soil based on the particle size of the soil of the target land.
- the second estimation function unit 102 calculates the oxygen concentration and the From the relationship with the corrosion rate or the corrosion amount, the relationship between the underground depth and the corrosion rate or the corrosion amount in the land is estimated.
- the state of corrosion of the structure composed of the metal buried in the target ground on the land is estimated.
- the corrosion estimating apparatus includes a CPU (Central Processing Unit) 301, a main storage device 302, an external storage device 303, a network connection device 304, and the like.
- the CPU 301 operates (executes the program) according to the program developed in the main storage device 302, so that each function (corrosion estimation method) described above can be realized.
- the program is a program for a computer to execute the corrosion estimation method shown in the above embodiment.
- a network connection device 304 connects to a network 305 . Also, functions may be distributed among multiple computing devices.
- the above-described corrosion rate or corrosion amount can be determined by a sensor or a metal and the like.
- the measurement unit 403 can be used to actually measure the amount of corrosion at the ground portion of the facility 401 to acquire the corrosion amount.
- the corrosion rate can be obtained by dividing the measured ground corrosion amount by the age of the facility.
- the corrosion rate can also be obtained from sensors or metals installed near the ground near the target facility.
- the measurement unit 403 can be composed of a sensor or metal installed near the facility 401 or the ground surface 402 near the facility 401 .
- a sensor, metal, or the like can be installed as the measurement unit 403 near the ground level of the facility 401 .
- the measuring unit 403 can be installed near the ground surface 402 of the target site, away from the equipment 401 .
- the measurement unit 403 can acquire information related to the corrosion rate or the amount of corrosion, and is generally preferably made of the same material as the metal to be estimated that constitutes the equipment. Simply, the amount of corrosion can be measured by burying the same kind of metal near the ground surface and measuring the weight change or the amount of thinning after a certain period of time has elapsed. In addition, for example, the measurement unit 403 using an electrode for AC impedance provided with the same kind of metal as a sensor can be used.
- the same metal as the constituent metal of the facility 401 is buried near the ground surface, and after a certain period of time has passed, the amount of corrosion of the buried metal is measured by the measurement unit 403, whereby the amount of corrosion and the rate of corrosion can be obtained.
- the measurement unit 403 measures the amount of corrosion and the rate of corrosion.
- an electrode for electrochemical measurement as a sensor in the ground surface, it is possible to obtain the amount of corrosion and the rate of corrosion.
- an AC impedance method is preferable.
- Information on corrosion rate can be obtained by using the same metal as the equipment's constituent metal for the electrodes and measuring the response to alternating current. Also, by measuring the amount of thinning due to corrosion with a measuring instrument such as a vernier caliper, it is possible to obtain the corrosion rate and the amount of corrosion.
- the corrosion estimation apparatus 100 can be a computer device as described above, and can be realized by an electronic device such as a general personal computer or tablet, for example.
- the measurement unit 403 may have a transmission function 404 for transmitting measured information, and may be configured to communicate with the corrosion estimation apparatus 100 via the communication network 405 . It is also possible to make one corrosion estimation device 100 correspond to a plurality of measurement units 403 .
- the display unit 105 can be realized by a monitor of a personal computer, a wireless device, or the like.
- the particle size of the soil can be obtained by measuring the soil sampled from the target land using a known particle size measuring device.
- the particle size of soil can be obtained as a distribution as shown in FIG.
- the average particle size can also be used simply.
- Fig. 6 shows an example of the relationship between the underground depth and the oxygen concentration in the soil.
- the relationship described above can be obtained by estimating how the oxygen concentration in the soil changes with respect to the depth of the soil. For example, assuming that the oxygen concentration on the ground surface is the same as that in the atmosphere, and that the oxygen concentration at a sufficiently deep position is zero, a model in which the concentration changes linearly with depth can be used to estimate: The relationships described above can be obtained.
- the slope of the straight line is related to soil particle size. For example, the relationship between the soil particle size and the slope of the concentration change with respect to depth can be determined in advance by experiments or the like.
- FIG. 7 shows an example of the relationship between oxygen concentration and corrosion rate or corrosion amount. This relationship can be obtained in advance by experiments or the like. It is known that in general soils such as black soil and red soil, there is a curved relationship with a maximum of about 10 to 18% with respect to the oxygen concentration in the soil. If the above-mentioned relationship is obtained in consideration of the effects of soil type, temperature, etc., the estimation accuracy will be higher.
- FIG. 8 shows an example of the relationship between underground depth and corrosion rate or corrosion amount.
- “d” shown in FIG. 8 is the corrosion rate or corrosion amount of the target metal (structure) near the ground surface of the land. From the value of d, the relationship between the underground depth and the oxygen concentration in the soil, and the relationship between the oxygen concentration and the corrosion rate or the corrosion amount, the relationship between the underground depth and the corrosion rate or the corrosion amount can be obtained. Therefore, since the corrosion rate or the corrosion amount with respect to the depth of the ground can be obtained only by acquiring the corrosion rate or the corrosion amount near the ground surface, it is possible to estimate the corrosion state of the deep part from the ground surface.
- the present invention based on the relationship between the depth of soil and the oxygen concentration in the soil, and the corrosion rate or corrosion amount of the target metal near the surface of the land, oxygen Since the relationship between the underground depth in the land and the corrosion rate or corrosion amount is estimated from the relationship between the concentration and the corrosion rate or corrosion amount, it becomes possible to easily and inexpensively inspect the deterioration state of underground metal facilities. .
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Abstract
Description
Claims (4)
- 対象となる土地の土壌の粒子径に基づいて前記土地の地中深さと土中の酸素濃度との関係を推定する第1ステップと、
前記土地の地表付近における対象となる金属の腐食速度または腐食量と、前記第1ステップで推定した関係とに基づいて、酸素濃度と前記腐食速度または前記腐食量との関係から、前記土地における地中深さと前記腐食速度または前記腐食量との関係を推定する第2ステップと
を備える腐食推定方法。 - 請求項1記載の腐食推定方法において、
前記第2ステップで推定した関係から、前記土地における目的の地中に埋設されている前記金属から構成された構造体の腐食状態を推定する第3ステップをさらに備えることを特徴とする腐食推定方法。 - 対象となる土地の土壌の粒子径に基づいて前記土地の地中深さと土中の酸素濃度との関係を推定する第1推定機能部と、
前記土地の地表付近における対象となる金属の腐食速度または腐食量と、前記第1推定機能部が推定した関係とに基づいて、酸素濃度と前記腐食速度または前記腐食量との関係から、前記土地における地中深さと前記腐食速度または前記腐食量との関係を推定する第2推定機能部と
を備える腐食推定装置。 - 請求項3記載の腐食推定装置において、
前記第2推定機能部が推定した関係から、前記土地における目的の地中に埋設されている前記金属から構成された構造体の腐食状態を推定する第3推定機能部をさらに備えることを特徴とする腐食推定装置。
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KR101382245B1 (ko) * | 2013-01-18 | 2014-04-10 | 한국수자원공사 | 독립전원 전기방식시스템 |
JP2017129436A (ja) * | 2016-01-20 | 2017-07-27 | 日本防蝕工業株式会社 | 土壌通気性評価方法および土壌通気性測定装置 |
JP2019203768A (ja) * | 2018-05-23 | 2019-11-28 | 日本電信電話株式会社 | 腐食量推定装置および腐食量推定方法 |
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JP2017129436A (ja) * | 2016-01-20 | 2017-07-27 | 日本防蝕工業株式会社 | 土壌通気性評価方法および土壌通気性測定装置 |
JP2019203768A (ja) * | 2018-05-23 | 2019-11-28 | 日本電信電話株式会社 | 腐食量推定装置および腐食量推定方法 |
Non-Patent Citations (1)
Title |
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HIRATA RYO, YONEMOTO WAKA, OOI AZUSA, TADA EIJI, NISHIKATA ATSUSHI: "Influence of Soil Particle Size, Covering Thickness, and pH on Soil Corrosion of Carbon Steel", ISIJ INTERNATIONAL, vol. 60, no. 11, 2 July 2020 (2020-07-02), pages 2533 - 2540, XP093011449 * |
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