JP2012194152A - Device and method for prediction of salt damage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To monitor and accurately predict metal corrosion deterioration due to salt damage in an outdoor environment.SOLUTION: A salt damage prediction device includes: a first sample 101 and a second sample 102 having the same shape, disposed in an objective environment and made of an objective metal; a first introduction part 103 comprising a first intake port 131 for introducing wind from the environment and a first supply port 132 for supplying the introduced wind to the surface of the first sample 101; a second introduction part 104 comprising a second intake port 141 for introducing the wind and a second supply port 142 for supplying the introduced wind to the surface of the second sample 102; a corrosion depth measuring part 105 which measures corrosion depths of the first sample 101 and the second sample 102 respectively by measuring electric resistances of the first sample 101 and the second sample 102 respectively under the same conditions; and a corrosion predicting part 106 which predicts deterioration time of the metal disposed in the environment due to corrosion.

Description

  The present invention relates to a salt damage prediction apparatus and method for predicting salt damage that corrodes a metal member caused by sea salt particles scattered by wind.

  There are various types of so-called “salt damage” caused by the chloride component. For example, there is salt damage in an outdoor high-voltage distribution line in which an insulator is used as an electrical insulating member. In areas close to the coast, sea salt particles are carried by the sea breeze, and salt leakage adheres to the insulator surface, surface leakage current flows due to the supply of moisture such as dew condensation, and eventually a surface flash occurs, causing discharge light emission, and power distribution. It is known to affect the equipment.

  Apart from the above-mentioned problems caused by “discharge”, it is known that the chloride component accelerates the “corrosion” deterioration of the metal, and not only the power line as described above, but also the metal member in the communication line and the utility pole is sea salt. Corrosion degradation is caused by particles and moisture, which may cause, for example, dropping of columnar equipment or dropping of electric wires.

  A salt damage monitoring system has been proposed to provide a salt damage warning by installing a pilot (reference) insulator, a discharge detector, an anemometer, a rain gauge, and a hygrometer on the pillar for the above-mentioned discharge problem on the insulator. (See Patent Document 1). Similarly, for the purpose of preventing the occurrence of a discharge problem on the insulator, a salt damage monitoring system for measuring the amount of adhered substance (chloride component) on the insulator from the transmitted light loss of the optical waveguide has been proposed (see Patent Document 2). ).

  On the other hand, with respect to metal corrosion, a technique has been proposed in which the degree of corrosion is monitored based on the amount of reflected light irradiated on a metal sample and a binary image of a microscopic image of the metal sample (see Patent Document 3).

JP 2008-177062 A JP 09-218150 A Japanese Patent No. 3343517

  However, the above-described method for monitoring metal corrosion is an optical detection method, which is suitable for investigation of sea salt particles in an indoor machine room or the like, and is not suitable for outdoors with sunlight. In addition, the evaluation in the depth direction of the metal sample cannot be performed because of the evaluation based on the light and darkness and light and shade distribution by the image. For this reason, in the method described above, the quantitativeness with the actual corrosion amount is not clear. Thus, conventionally, there is a problem in that it is not easy to monitor and accurately predict metal corrosion deterioration due to salt damage outdoors.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to enable accurate prediction by monitoring metal corrosion deterioration due to salt damage outdoors.

  The salt damage prediction apparatus according to the present invention includes a first sample and a second sample having the same shape that are arranged in a target environment and made of the target metal, a first intake port that takes in the wind in the environment, and the wind that is taken in The first introduction means having a first supply port for supplying the first sample to the surface of the first sample, the second introduction port having the second intake port for taking in the wind and the second supply port for supplying the taken wind to the surface of the second sample Means, corrosion depth measuring means for measuring the corrosion depth of each of the first sample and the second sample by measuring the electrical resistance of the first sample and the second sample, respectively, and the corrosion of the first sample to be measured The first time when the depth reaches the set threshold, the second time when the corrosion depth of the second sample to be measured reaches the threshold, the ratio between the opening area of the first intake port and the opening area of the first supply port And the opening of the second intake port Corrosion predicting means for predicting the deterioration time due to corrosion of metal disposed in the environment from the relationship between the ratio of the product and the opening area of the second supply port is provided, and the opening area of the first intake port is the first supply The opening area of the second intake port is formed wider than the opening area of the second supply port, and the opening area of the second intake port is formed wider than the opening area of the first intake port. ing.

In the salt damage prediction apparatus, the opening area of the first intake port is formed to be n times (n is a natural number of 2 or more) the opening area of the first supply port, and the opening area of the second intake port is the second supply port It is only necessary to be formed to be n ² times the opening area. The opening area of the first supply port and the opening area of the second supply port may be the same area. Moreover, the 1st intake port and the 2nd intake port should just face the same direction. Further, the first intake port and the second intake port are preferably directed upward.

  The salt damage prediction method according to the present invention includes a first step of arranging a first sample and a second sample of the same shape made of a target metal in a target environment, and a first intake port for taking in wind in the environment And a second introduction port for supplying the wind from the first supply port to the first sample using a first introduction means having a first supply port for supplying the taken-in air, and a second intake port for supplying the wind. The second step of supplying wind from the second supply port to the second sample using the second introduction means having the supply port, and measuring the electric resistance of the first sample and the second sample under the same conditions, respectively. A third step of measuring the corrosion depth of each of the sample and the second sample, a first time when the corrosion depth of the first sample reaches a set threshold value, and a second time when the corrosion depth of the second sample reaches the threshold value , The opening area of the first intake port and The fourth step of predicting the deterioration time due to corrosion of the metal disposed in the environment from the ratio of the opening area of the first supply port and the ratio of the opening area of the second intake port and the opening area of the second supply port The opening area of the first intake port is formed larger than the opening area of the first supply port, the opening area of the second intake port is formed wider than the opening area of the second supply port, and the second intake port is formed. The opening area of the mouth is formed wider than the opening area of the first intake opening.

In the salt damage prediction method, the opening area of the first intake port is n times the opening area of the first supply port (n is a natural number of 2 or more), and the opening area of the second intake port is the opening of the second supply port The area may be n ² times the area. The opening area of the first supply port and the opening area of the second supply port may be the same area. Further, the first intake port and the second intake port may be directed in the same direction. Further, the first intake port and the second intake port may be directed to the windward side.

  As described above, according to the present invention, since the first introduction means and the second introduction means are used to supply more air to the first sample and the second sample, metal corrosion due to salt damage outdoors. An excellent effect is obtained in that the deterioration can be monitored and accurately predicted.

FIG. 1 is a configuration diagram illustrating a configuration of a salt damage prediction apparatus according to an embodiment of the present invention. FIG. 2 is a flowchart for explaining the operation of the salt damage prediction apparatus according to the embodiment of the present invention. FIG. 3 is a configuration diagram illustrating an installation example of the salt damage prediction apparatus. FIG. 4 is a configuration diagram showing the configuration of the corrosion prediction unit 106. FIG. 5 is a characteristic diagram showing the relationship between electrical resistance and corrosion. FIG. 6 is an explanatory diagram for explaining the effect of the introduction unit. FIG. 7 is an explanatory diagram illustrating an example of each dimension of the introduction portion. FIG. 8 is a characteristic diagram showing a change in corrosion depth that progresses over time. FIG. 9 is a configuration diagram showing another configuration of the salt damage prediction apparatus according to the embodiment of the present invention. FIG. 10 is a flowchart illustrating a more detailed operation (salt damage prediction method) of the salt damage prediction apparatus according to the present embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram illustrating a configuration of a salt damage prediction apparatus according to an embodiment of the present invention. This apparatus first has a first sample 101 and a second sample 102 having the same shape, which are arranged in a target environment and made of a target metal, a first intake port 131 for taking in the wind in the environment, and the taken-in wind. The first introduction part 103 having a first supply port 132 for supplying the air to the surface of the first sample 101, the second intake port 141 for taking in the wind, and the second supply for supplying the taken air to the surface of the second sample 102 A second introduction unit 104 having a mouth 142. The first introduction part 103 and the second introduction part 104 are so-called throttle tubes. The first introduction part 103 and the second introduction part 104 only have to be arranged so that each intake port faces the same direction.

  In addition, this apparatus includes a corrosion depth measurement unit 105 that measures the corrosion depths of the first sample 101 and the second sample 102 by measuring the electrical resistances of the first sample 101 and the second sample 102, respectively, under the same conditions. .

  Further, in the present apparatus, the corrosion depth of the second sample 102 to be measured reaches the threshold value for the first time when the corrosion depth of the first sample 101 measured by the corrosion depth measurement unit 105 reaches the set threshold value. From the relationship between the ratio of the opening area of the first intake port 131 and the opening area of the first supply port 132 and the ratio of the opening area of the second intake port 141 and the opening area of the second supply port 142 during the second time. A corrosion prediction unit 106 is provided for predicting the deterioration time due to corrosion of the metal disposed in the environment.

  Here, the opening area of the first intake port 131 is formed wider than the opening area of the first supply port 132, the opening area of the second intake port 141 is formed wider than the opening area of the second supply port 142, and The opening area of the two intake ports 141 is formed wider than the opening area of the first intake port 131. Therefore, the first introduction unit 103 and the second introduction unit 104 are throttle tubes having different throttle amounts.

  Next, operation | movement (salt damage prediction method) of the salt damage prediction apparatus mentioned above is demonstrated using the flowchart of FIG. First, in step S201, the first sample 101 and the second sample 102 are placed in a target environment. Next, in step S <b> 202, wind in the above environment is supplied to the first sample 101 from the first supply port 132 using the first introduction unit 103, and simultaneously, from the second supply port 142 using the second introduction unit 104. The wind is supplied to the second sample 102.

  Next, in step S203, the corrosion depth measurement unit 105 measures the corrosion depths of the first sample 101 and the second sample 102 by measuring the electrical resistances of the first sample 101 and the second sample 102, respectively, under the same conditions. To do.

  Next, the first time when the corrosion prediction unit 106 reaches the threshold value at which the corrosion depth of the first sample 101 is set, the second time when the corrosion depth of the second sample 102 reaches the threshold value, and the first intake port From the relationship between the ratio of the opening area to the opening area of the first supply port 132 and the ratio of the opening area of the second intake port to the opening area of the second supply port 142, the deterioration time due to corrosion of the metal disposed in the environment Predict.

  Here, the first sample 101 and the second sample 102 are made of a metal (copper or the like) actually used in a utility pole or the like, and have a predetermined size (thickness and thickness) such as a linear shape (cylindrical shape), for example. The length of the metal piece may be used. For example, the diameter may be about 1 mm and the length may be about 5 cm. When the first sample 101 and the second sample 102 are used in a corrosive environment, they are consumed more quickly. For example, a shape such as a commonly used fuse may be used.

  The corrosion depth measurement unit 105 measures the depth of corrosion by applying a voltage to the first sample 101 and the second sample 102 periodically and measuring the electrical resistance. The relationship between the electrical resistance and the corrosion depth is quantified using the first sample 101 and the second sample 102 in advance. Further, each time the first sample 101 and the second sample 102 are newly exchanged, the relationship between the measured electric resistance and the corrosion depth is stored.

  In the corrosion prediction unit 106, a threshold value of the corrosion depth (electric resistance) in a state where the corrosion has progressed to the stage where a failure or the like occurs is set, and the measured value by the corrosion depth measurement unit 105 is compared with this threshold value. evaluate.

Further, the corrosion prediction unit 106 becomes a target from a relational expression between a time T _A when the corrosion depth of the first sample 101 exceeds a threshold and a time T _B when the corrosion depth of the second sample 102 exceeds a certain threshold. The deterioration time of a practical member made of metal is calculated.

  The salt damage prediction apparatus is installed at the same time as new installation of operation equipment including metal members. For example, as shown in FIG. 3, the salt damage prediction apparatus 301 may be installed and used on a utility pole 302 where a target metal member is used. In addition, a plurality of salt damage prediction devices may be used and installed at a predetermined interval in one place as a representative for each area 311 that seems to have the same environment. Further, the deterioration time (maintenance time limit) obtained from each area 311 may be transmitted to the management center 320.

  Hereinafter, the prediction of the deterioration time will be described in more detail. The first introduction unit 103 and the second introduction unit 104 collect the sea breeze in the actual use environment, increase the flow velocity by restricting this flow, and supply more air to the first sample 101 and the second sample 102. The purpose is to do. Sea breeze is a major factor in the progress of corrosion, and the corrosion of metal members increases as they hit (expose) more sea breeze.

  By using the first introduction part 103 and the second introduction part 104, more sea breeze is supplied to the first sample 101 and the second sample 102 than the metal member actually used in the measurement environment. The corrosion of the first sample 101 and the second sample 102 proceeds before the metal member.

For example, in the first introduction unit 103, the area ratio of the first supply port 132 and the first intake port 131 is 1: n, and the second introduction unit 104 is the area of the second supply port 142 and the second intake port 141. The ratio may be 1: n ² . Other than this, the first introduction unit 103 and the second introduction unit have the same configuration.

In this case, theoretically, the first sample 101 of the first introduction part 103 is corroded n times faster than the metal member in the actual environment that does not use the introduction part as a first approximation, and the second introduction part 104 In the second sample 102, corrosion proceeds n ² times faster than the metal member in the actual environment that does not use the introduction portion as a first order approximation. However, strictly speaking, since the effective magnification of n is unknown, the deterioration time (T _X ) of the metal member actually used is accurately predicted from only the deterioration time (T _A ) of the first sample 101. I can't.

In contrast to this, by measuring (calculating) the deterioration time (T _B ) of the second sample 102 in addition to the deterioration time of the first sample 101, the ratio (magnification) of both deterioration times (deterioration speed) is obtained. It becomes possible to accurately predict the deterioration time (T _X ) of the metal member actually used.

As described above, since the introduction portion is used, the first sample 101 and the second sample 102 are deteriorated earlier than the deterioration of the actually used metal member. Further, the second sample 102 by the second introduction part 104 having a larger intake port deteriorates faster than the first sample 101. Therefore, the deterioration period of the second sample 102 (T _B) and the deterioration time of the first sample 101 (T _A), sequentially measured (detected), _{"T A / T X = T B} / T A ··· From the relational expression (1), the deterioration time (T _X ) of the metal member can be accurately predicted. As described above, according to the present embodiment, it is possible to accurately predict by monitoring metal corrosion deterioration due to salt damage outdoors. As a result, maintenance measures such as exchanging metal members in advance before the occurrence of a failure can be implemented, and the failure can be avoided in advance.

[Example]
Hereinafter, it demonstrates in detail using an Example.

  First, installation of this apparatus will be described. As described above, the salt damage prediction apparatus according to the present embodiment is installed in the vicinity of a metal member that is desired to detect corrosion such as a utility pole. The first introduction unit 103 and the second introduction unit 104 are installed with their intake ports facing the same coastal direction (direction in which the wind blows: upwind) so as to efficiently collect the sea breeze. A power source and a communication line are connected to the apparatus. For example, a plurality of salt damage prediction apparatuses installed in various places at predetermined intervals may be communicable with a management center via a network.

  Next, the corrosion prediction unit 106 will be described in detail with reference to FIG. FIG. 4 is a configuration diagram showing the configuration of the corrosion prediction unit 106. The corrosion prediction unit 106 includes a corrosion data storage unit 161, a corrosion determination unit 162, a maintenance time calculation unit 163, a data transmission unit 164, and a function control unit 165.

  The corrosion data accumulation unit 161 accumulates the corrosion depths of the first sample 101 and the second sample 102 measured by the corrosion depth measurement unit 105.

  The corrosion determination unit 162 determines the deterioration state by comparing each corrosion depth stored in the corrosion data storage unit 161 with a preset threshold value.

  The maintenance time calculation unit 163 includes a deterioration time of the first sample 101 and a deterioration time of the second sample 102 that are determined to be deteriorated by the corrosion determination unit 162, an opening area of the first intake port 131, and an opening area of the first supply port 132. And the relationship between the opening area of the second intake port 141 and the opening area of the second supply port 142, the deterioration time of the actually used metal member (practical member) is calculated.

  The data transmission unit 164 transmits the maintenance deadline (member deterioration time) calculated by the maintenance time calculation unit 163 to the set transmission destination. Moreover, the function control part 165 controls the function of each part mentioned above.

  Here, the corrosion depth measurement unit 105 will be described. The corrosion depth measurement unit 105 measures the depth of corrosion by applying a voltage to the first sample 101 and the second sample 102 periodically and measuring the electrical resistance.

  In general, metals placed in the atmospheric environment corrode from the surface over time. In addition, when a voltage is applied to both ends of the linear metal and the electrical resistance is measured, electricity does not flow through the corroded portion, and thus the resistance increases. This relationship is shown in FIG. FIG. 5 is a characteristic diagram showing the relationship between electrical resistance and corrosion. In the case of a cylindrical metal wire, the relationship between the surface corrosion depth (thickness diameter) and the electrical resistance is a decreasing relationship as shown in FIG. The (average) corrosion depth can be measured from the increase in resistance. The relationship between the electrical resistance and the corrosion depth may be quantified by measuring in advance using the first sample 101 and the second sample 102.

  The corrosion data accumulation unit 161 accumulates measurement data (corrosion depth) each time by the corrosion depth measurement unit 105. For example, the corrosion depth measurement unit 105 performs measurement once a day on a regular basis, and the measurement result is stored in the corrosion data storage unit 161.

  In the corrosion prediction unit 106, the corrosion depth corresponding to the progress of corrosion in which a failure or the like occurs is stored as a threshold value, and the corrosion determination unit 162 compares the threshold value with the measured corrosion depth to thereby determine the deterioration state. Determine. For example, when 100 μm is set as the threshold, the corrosion determination unit 162 determines (evaluates) that the measured sample is in a deteriorated state when the measured corrosion depth exceeds 100 μm.

Maintenance timing calculation unit 163 exceeds a certain threshold corrosion depth of the first sample 101 (it is determined that the deterioration state) and the time T _A, the corrosion depth of the second sample 102 exceeds a certain threshold and (deterioration state from the determined) relationship between time T _B, it calculates a degradation time of practical members. When the corrosion depth of both the first sample 101 and the second sample 102 reaches the threshold value, the maintenance time calculation unit 163 calculates the deterioration time of the practical member. As described above, when the maintenance time calculation unit 163 calculates the deterioration time of the practical member, the data transmission unit 164 transmits the calculated maintenance deadline (deterioration time) to the management center (not shown).

  Next, the first introduction unit 103 and the second introduction unit 104 will be described in more detail. When the first sample 101 and the second sample 102 are left in the field environment as they are and the corrosion is monitored, even if the deterioration state is detected, the actual metal member is already in the deteriorated state at the time of detection. And there may be problems such as damage. In some cases, the actual metal member corrodes faster than the first sample 101 and the second sample 102, and problems such as breakage may occur before the deterioration state is detected.

  Metals corrode from the surface as time passes in the atmosphere, but in areas close to the coast, salt is likely to adhere to areas that are already corroded, creating an environment that accelerates corrosion. Sea breeze is a major factor in the progress of corrosion, and the greater the amount of metal members that hit the sea breeze, the faster the corrosion proceeds.

  The first introduction unit 103 and the second introduction unit 104 are intended to supply more sea breeze to the first sample 101 and the second sample 102 in an actual usage environment. As shown in FIG. 6A, in the sample 601 that is left as it is without using the introduction part or the like, corrosion proceeds at a speed according to the natural environment in which it is placed. On the other hand, as shown in FIG. 6 (b), by using the introduction part 603, it is possible to collect and supply the wind corresponding to the size of the opening of the intake port of the introduction part 603 to the sample 602. Compared to the sample 601 without 603, corrosion proceeds faster.

Hereinafter, examples of dimensions of the first introduction unit 103 and the second introduction unit 104 will be described. For example, as illustrated in FIG. 7A, the first introduction unit 103 may have a diameter ratio of the first supply port 132 and the first intake port 131 of 1: 2. In this case, the area ratio is 1: 4 (n = 4). Further, as shown in FIG. 7B, the second introduction unit 104 may have a diameter ratio of the second supply port 142 and the second intake port 141 of 1: 4. In this case, the area ratio is 1:16 (n ² = 16). What is necessary is just to comprise combining the 1st introduction part 103 and the 2nd introduction part 104 which were each such a dimension. As described above, by making the opening areas of the first supply port 132 and the second supply port 142 the same, it is possible to simplify the calculation of the deterioration time described later.

The diameter ratio of the first supply port 132 and the first intake port 131 of the first introduction unit 103 is not limited to 1: 2 described above, but may be 1: 3. In this case, the area ratio is 1: 9 (n = 9). Correspondingly, the diameter ratio of the second supply port 142 and the second intake port 141 of the second introduction unit 104 may be 1: 9. In this case, the area ratio is 1:81 (n ² = 81).

  Next, the effect of the first supply port 132 of the first introduction part 103 on the corrosion rate is shown in FIG. FIG. 8 is a characteristic diagram showing a change in corrosion depth that progresses over time.

  First, as described above, when the area ratio between the first supply port 132 and the first intake port 131 is 1: 4, the change of the first sample 101 using the first introduction unit 103 uses the introduction unit. Theoretically, the corrosion proceeds four times faster as a first order approximation than the change in the real environment. In addition, as described above, when the area ratio between the second supply port 142 and the second intake port 141 is 1:16, the change of the second sample 102 using the second introduction unit 104 uses the introduction unit. Theoretically, the corrosion proceeds 16 times faster as a first order approximation than the change in the actual environment.

However, in actuality, the effect of increasing the corrosion rate by each introduction portion is not as great as the theoretical value. For example, the time (T) when the corrosion state of the first sample 101 reaches the threshold corrosion depth (threshold corrosion thickness). _A ) is later than ¼ of the actual environment degradation time (T _X ). Therefore, the deterioration time (T _X ) of the practical member cannot be accurately predicted only by the deterioration time (T _A ) of the first sample 101.

Here, when the corrosion increasing effect (magnification) on the actual environment by the first introduction unit 103 is α, the relationship between the deterioration time (T _A ) of the first sample 101 and the deterioration time (T _X ) of the practical member is “ T _A / T _X = α (2) ”.

On the other hand, since the corrosion increase effect (magnification) on the first introduction part 103 by the second introduction part 104 can also be α, the deterioration time (T _B ) of the second sample 102 and the deterioration time (T) of the first sample 101 _A )) is “T _B / T _A = α (3)”.

From these facts, “T _A / T _X = T _B / T _A (1)” is obtained from the formulas (2) and (3).

Thus, by observing the deterioration time (T _A ) of the first sample 101 using the first introduction part 103 and the deterioration time (T _B ) of the second sample 102 using the second introduction part 104, The effect of increasing corrosion by the introduction part can be obtained.

Further, “T _X = (T _A ) is determined by the deterioration time (T _A ) of the first sample 101 using the first introduction part 103 and the deterioration time (T _B ) of the second sample 102 using the second introduction part 104. _A ) ² / T _B (4) ”, the deterioration time (T _X ) of the practical member can be accurately predicted. Thus, maintenance measures such as exchanging metal members in advance before the occurrence of a failure can be implemented, and the failure can be avoided in advance.

  By the way, although the 1st introducing | transducing part 103 and the 2nd introducing | transducing part 104 have installed each intake port toward the shore direction, for example, a wind direction is not always constant. On the other hand, by using two introduction parts with different intake port area ratios, the non-linearity of the sea breeze collection effect derived from the physical shape of the introduction part is offset as a whole, and it is difficult to be affected by the wind direction. Yes. However, for example, the wind in the direction of the wind from the side with respect to the take-in direction from the take-in port of the introduction part toward the supply port cannot be sufficiently taken in, and there is a possibility that a shielding effect appears conversely.

  In order to avoid such a state, it is conceivable that the introduction direction of the introduction part can be automatically displaced along the wind direction. For example, as shown in FIG. 9, the salt damage prediction device may be installed in a wind direction device including a column 902 supported by a bearing 901 and a vertical tail 904 coupled to the column 902 by a coupling rod 903. The salt damage prediction apparatus includes a first sample 101, a second sample 102, a first introduction unit 103, a second introduction unit 104, a corrosion depth measurement unit 105, and a corrosion prediction unit 106. The first introduction part 103 and the second introduction part 104 make the respective intake directions coincide with the direction in which the connecting rod 903 and the vertical tail 904 extend.

  By doing in this way, the intake port of each introduction part becomes interlocked with the movement of the vertical tail 904, and the intake port of each introduction part faces the windward by the movement of the vertical tail 904 that receives the wind. become. As a result, even if the wind direction changes, the wind (atmosphere) can be efficiently guided to the sample by each introducing portion.

  Next, operation | movement (salt damage prediction method) of the salt damage prediction apparatus in this Embodiment is demonstrated in detail using FIG.

First, in step S1001, the corrosion depth measurement unit 105 measures the electrical resistance of the second sample 102, and in step S1002, converts the measured electrical resistance value into a corrosion depth. Next, in step S1003, the corrosion determination unit 162 determines that the obtained corrosion depth exceeds the threshold value. In repeating steps S1001~ step S1003, (Y in step S1003) if the corrosion depth is greater than the threshold value, the electric resistance value with master to obtain the corrosion depth time T _B which is measured corrosion data storage unit 161 (step S1004). For example, the corrosion data storage unit 161, time T _B is stored together with the identification information for identifying the second sample 102.

In step S1005, the corrosion depth measurement unit 105 measures the electrical resistance of the first sample 101. In step S1006, the measured electrical resistance value is converted into a corrosion depth. Next, in step S1007, the corrosion determination unit 162 determines that the obtained corrosion depth exceeds the threshold value. In repeating steps S1005~ step S1007, (Y in step S1007) if the corrosion depth is greater than the threshold value, the time the electric resistance value with master to obtain the corrosion depth was measured T _A corrosion data storage unit 161 (step S1008). For example, time T _A is stored in the corrosion data storage unit 161 together with identification information for identifying the first sample 101.

When time T _B and time T _A are obtained as described above, in step S1009, the maintenance time calculation unit 163 determines that “T _X = (T _A ) ² / T _B (4)” calculating a deterioration period T _X practical member. Thereafter, in step S1010, the data transmission unit 164 transmits the calculated deterioration time T _X to the management center together with, for example, information on the measurement location. In this way, when the transmitted information is received by the management center, the administrator who has been monitored by the management center takes measures to maintain the object at the corresponding measurement location before the notified deterioration time. (Step S1011).

  According to the present invention described above, it is possible to predict the deterioration time of metal members such as outdoor electric wires and utility poles due to corrosion in the actual environment, so that maintenance measures such as member replacement can be taken before failure occurs. It can be applied and failure can be avoided in advance.

  The present invention is not limited to the embodiment described above, and many modifications and combinations can be implemented by those having ordinary knowledge in the art within the technical idea of the present invention. It is obvious. For example, in the above-described embodiment, the cross-sectional shape of the introduction portion is circular. However, the shape is not limited to this, and may be a polygon such as a quadrangular shape or an elliptical shape.

  DESCRIPTION OF SYMBOLS 101 ... 1st sample, 102 ... 2nd sample, 103 ... 1st introduction part, 104 ... 2nd introduction part, 105 ... Corrosion depth measurement part, 106 ... Corrosion prediction part, 131 ... 1st intake port, 132 ... 1st Supply port, 141 ... second intake port, 142 ... second supply port.

Claims (10)

A first sample and a second sample of the same shape that are arranged in a target environment and made of a target metal;
A first introduction means comprising a first intake port for taking in wind in the environment and a first supply port for supplying the taken-in wind to the surface of the first sample;
A second introduction means comprising a second intake port for taking in the wind and a second supply port for supplying the taken-in wind to the surface of the second sample;
A corrosion depth measuring means for measuring the corrosion depths of the first sample and the second sample by measuring the electrical resistance of the first sample and the second sample, respectively, under the same conditions;
The first time when the corrosion depth of the first sample to be measured reaches a set threshold, the second time when the corrosion depth of the second sample to be measured reaches the threshold, and the opening of the first intake port From the relationship between the ratio of the area and the opening area of the first supply port, and the ratio of the opening area of the second intake port and the opening area of the second supply port, it is caused by corrosion of the metal disposed in the environment. And at least a corrosion prediction means for predicting the deterioration time,
An opening area of the first intake port is formed wider than an opening area of the first supply port, an opening area of the second intake port is formed wider than an opening area of the second supply port, and the second intake port is formed. An opening area of the mouth is formed wider than the opening area of the first intake opening. In the salt damage prediction apparatus according to claim 1,
The opening area of the first intake port is formed to be n times (n is a natural number of 2 or more) the opening area of the first supply port,
The opening area of the second intake port is formed to be n ² times the opening area of the second supply port. In the salt damage prediction apparatus according to claim 1 or 2,
An opening area of the first supply port and an opening area of the second supply port are the same area. In the salt damage prediction apparatus of any one of Claims 1-3,
The salt intake prediction apparatus, wherein the first intake port and the second intake port face the same direction. In the salt damage prediction apparatus according to claim 4,
The salt damage prediction apparatus, wherein the first intake port and the second intake port are facing upwind. A first step of arranging a first sample and a second sample of the same shape made of a target metal in a target environment;
The wind is supplied to the first sample from the first supply port using a first introduction means including a first intake port for taking in wind in the environment and a first supply port for supplying the taken-in wind, and the wind is supplied to the first sample. A second step of supplying the wind from the second supply port to the second sample using a second introduction means comprising a second intake port for capturing and a second supply port for supplying the captured wind;
A third step of measuring the corrosion depth of the first sample and the second sample by measuring the electrical resistance of the first sample and the second sample, respectively, under the same conditions;
A first time when the corrosion depth of the first sample reaches a set threshold value, a second time when a corrosion depth of the second sample reaches the threshold value, an opening area of the first intake port and the first supply The deterioration time due to corrosion of the metal disposed in the environment is predicted from the ratio of the opening area of the mouth and the ratio of the opening area of the second intake port and the opening area of the second supply port. At least 4 steps,
An opening area of the first intake port is formed larger than an opening area of the first supply port, an opening area of the second intake port is formed wider than an opening area of the second supply port, and the second intake port is formed. The opening area of the mouth is formed wider than the opening area of the first intake port. In the salt damage prediction method according to claim 6,
The opening area of the first intake port is n times (n is a natural number of 2 or more) the opening area of the first supply port,
The salt damage prediction method according to claim 1, wherein an opening area of the second intake port is n ² times an opening area of the second supply port. In the salt damage prediction method according to claim 6 or 7,
The salt damage prediction method, wherein the opening area of the first supply port and the opening area of the second supply port are the same area. In the salt damage prediction method according to any one of claims 6 to 8,
The salt damage prediction method, wherein the first intake port and the second intake port are directed in the same direction. In the salt damage prediction method according to claim 9,
The salt damage prediction method, wherein the first intake port and the second intake port are directed to the windward side.