JP2011137760A - Outdoor structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an outdoor structure equipped with a corrosion detector capable of preventing injury from salt, while monitoring the change of injury from salt with the passage of time, at all times. <P>SOLUTION: The corrosion detector 10A, provided in the outdoor structure, includes a corrosion sensor 110 for monitoring corrosion environment, an ammeter 115 for measuring the corrosion current produced in the corrosion sensor 110 and a variable resistor 11 for altering the corrosion current; and when the corrosion environment is measured, the variable resistor 11 is changed so that the corrosion current maintains substantially a constant value (e.g., 100 nA). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an outdoor structure provided with a corrosion detection device capable of detecting in advance corrosion due to salt damage or the like.

For example, since outdoor structures such as windmills are installed on the sea or on the coast, there is a concern that external coating of the windmill, transformers provided inside the windmill, control panels, etc. may be corroded by salt damage.
For this reason, it is necessary to predict salt damage according to the material inside the device and the coating.

  As evaluation methods thereof, JISZ2371 “salt spray test method”, JISK5621 “combined cycle test” and the like have been established (Non-patent Documents 1 and 2).

  In recent years, a corrosion sensor has been proposed as a sensor for predicting the amount of salt corrosion (Patent Document 1).

  Explaining this corrosion sensor: When two dissimilar metals (substrate and conductive part) are insulated from each other by insulating parts, and both ends are exposed to the environment, a water film is connected between the two metals according to the environment. Corrosion current flows. Since this current corresponds to the corrosion rate of the base metal, it is used as the corrosion sensor.

This corrosion sensor is called “Atmospheric Corrosion Monitor” or ACM type corrosion sensor.
An example of this sensor is shown in FIGS. As shown in FIGS. 3 and 4, the ACM type corrosion sensor (hereinafter referred to as “corrosion sensor”) 110 cuts out a carbon steel plate having a thickness of 0.8 mm into a 64 mm × 64 mm substrate as a substrate 111. An insulating portion 112 of an insulating paste (thickness 30 to 35 μm: SiO ₂ ) is applied and cured using a precision screen printer for thick film ICs.
Subsequently, a conductive paste (thickness 30 to 40 μm, filler: Ag) is laminated and printed on the pattern of the insulating portion 112 so as to maintain the greenness with the substrate 111, and cured to form the conductive portion 113. A corrosion sensor is configured (Non-patent Document 3).
Here, the substrate 111 is a first conductive portion, and the conductive portions 113 are a plurality of linear second conductive portions provided at a predetermined interval.

Then, as shown in FIG. 5, the conductive portion 113 and the substrate 111 are short-circuited by the water film 114 such as humidity or sea salt (chloride ion or the like), and the corrosion current of the Fe-Ag galvanic pair resulting from this. Is measured by an ammeter 115. In FIG. 3, reference numerals 116a and 116b denote terminals. The exposed portion of the carbon steel plate (Fe) surface becomes the anode (anode) of the sensor, and the conductive paste (Ag) becomes the cathode (cathode).
The corrosion current of the galvanic pair has a correlation with the corrosion amount of the steel material or the zinc material, so that the corrosion rate can be quantitatively evaluated.

  Further, a method for predicting the amount of salt damage corrosion of photovoltaic power generation system members using the ACM type corrosion sensor is proposed, and the amount of sea salt attached is estimated from the relationship diagram between humidity, measured current value, and amount of sea salt attached. Has been proposed (Non-Patent Documents 4 and 5).

JP 2008-157647 A

JISZ2371 JISK5621 http://www.nims.go.jp/mdss/corrosion/ACM/ACM1.htm Matsushita Electric Works (Nov. 2002) p79-85 Materials and environment "Evaluation of environmental corrosivity by ACM sensor" 54, 3

  However, in the JISZ2371 standard test and the JISK5621 standard test, there is a problem that the test accuracy is poor because the test environment does not match the actual environment.

  Since the ACM type corrosion sensor is a self-corrosion type sensor, if it is used for a long period of time, the carbon steel plate as a substrate is corroded due to deterioration of the sensor itself, resulting in separation from the insulating layer, and sensor performance. There is a problem that cannot be maintained.

However, if the ACM type corrosion sensor does not corrode, the measurement accuracy of the corrosive environment may deteriorate. For the purpose of extending the life of the sensor, if the corrosion of the sensor is excessively suppressed, There is also a problem that the measurement itself cannot be performed.
Therefore, it is eagerly desired to extend the life of the sensor according to the corrosive environment.

  In view of the above problems, an object of the present invention is to provide an outdoor structure provided with a corrosion detection device capable of extending the life of a sensor according to a corrosive environment.

  A first invention of the present invention for solving the above-described problems includes a corrosion sensor for monitoring a corrosive environment, an ammeter for measuring a corrosion current generated in the corrosion sensor, and a variable resistor for changing the corrosion current. An outdoor structure with a corrosion detector having

  A second invention is the outdoor structure according to the first invention, further comprising an environment monitor for measuring an installation environment of the corrosion sensor.

  A third invention is the outdoor structure according to the second invention, wherein the environmental monitor is at least one of a hygrometer, a thermometer, and an illuminometer.

  According to the present invention, it is possible to extend the life of the sensor according to the corrosive environment.

FIG. 1 is a schematic diagram of a corrosion detection apparatus according to the first embodiment. FIG. 2 is a schematic diagram of the corrosion detection apparatus according to the second embodiment. FIG. 3 is a plan view of a corrosion sensor according to the prior art. FIG. 4 is a schematic view of a corrosion sensor according to the prior art. FIG. 5 is a schematic view of the prior art during corrosion.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

  An outdoor structure provided with a corrosion detector according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a corrosion detector 10A provided in an outdoor structure according to the present embodiment. A corrosion sensor 110 for monitoring a corrosive environment, an ammeter 115 for measuring a corrosion current generated in the corrosion sensor 110, and the corrosion current. And a variable resistor 11 for changing the.

  When the corrosive environment is measured, the variable resistor 11 is changed so that the corrosive current is maintained at a substantially constant value (for example, 100 nA).

  Thereby, the deterioration state of the corrosion sensor 110 can always be made constant, and the lifetime after that can be predicted.

That is, when it is assumed that when the accumulated electric quantity of the corrosion sensor 110 reaches 1 coulomb, it is determined that the life is deteriorated, the current accumulated electric quantity is obtained by multiplying the previous use time, and the difference becomes the remaining life.
Thereby, the lifetime of the sensor can be extended according to the corrosive environment.

  An outdoor structure provided with a corrosion detector according to an embodiment of the present invention will be described with reference to the drawings. In FIG. 2, the corrosion detection device 10 </ b> B provided in the outdoor structure according to the present embodiment has an environment monitor 20 that measures the installation environment of the corrosion sensor 110 in the device of the first embodiment.

  Here, examples of the environmental monitor 20 include at least one of a hygrometer 20A, a thermometer 20B, and an illuminance meter 20C.

  For example, when measuring using the hygrometer 20A, the hygrometer 20A is provided in the vicinity of the corrosion sensor 110.

Then, the humidity is measured by the hygrometer 20A, and the measurement results are classified into, for example, three regions, humidity I (less than 30%), humidity II (30 to 70%), and humidity III (70% or more).
Resistance I (low resistance: point A), resistance II (resistance is middle: point B), and resistance III (high resistance: point C) are set according to the humidity I to III.
Then, the internal resistance is changed (any one of points A, B, and C) according to the humidity measured by the hygrometer 20A. As a result, the internal resistance is finely adjusted so as to approximate a predetermined corrosion current value (for example, 100 nA), and to approach the predetermined corrosion current value (100 nA).

  As a result, the remaining life can be predicted by setting the resistance according to the environment so that a constant corrosion current always flows.

  Thus, for example, if a corrosion sensor cannot be replaced until it returns to the home port once it has been sailed, such as a tanker, it is possible to extend the service life without changing the sensor. It becomes possible to monitor the corrosive environment during the period.

When the environmental monitor 20 measures the temperature, the temperature is measured by the thermometer 20B, and the measurement results are, for example, three regions, temperature I (less than 0 degrees), temperature II (0 to 40 degrees), and temperature III. Classify (over 40 degrees).
According to the temperatures I to III, the resistance I (low resistance: point A), the resistance II (resistance is middle: point B), and the resistance III (high resistance: point C) may be set.

When the environmental monitor 20 measures the illuminance, the illuminance is measured by the illuminometer 20C, and the measurement results are obtained by, for example, three areas, illuminance I (less than 10 lux), illuminance II (10 to 5000 lux), and illuminance III. Classify (more than 5000 lux).
According to the illuminances I to III, the resistance I (low resistance: A point), the resistance II (resistance is middle: B point), and the resistance III (high resistance: C point) may be set.

  The above is an example of a tanker as an outdoor structure according to the present invention. It can also be applied to power plant equipment, reinforcing steel building, railway equipment, etc. Furthermore, it can also be applied to salt damage countermeasures for moving bodies such as vehicles and ships.

  As described above, the outdoor structure provided with the corrosion detection device according to the present invention can extend the life of the sensor according to the corrosive environment. For example, the outdoor structure is used for determining deterioration of components of the wind power generation device. Is suitable.

10A, 10B Corrosion detector 20 Environmental monitor 20A Hygrometer 20B Thermometer 20C Illuminance meter

Claims (3)

A corrosion sensor that monitors the corrosive environment;
An ammeter for measuring the corrosion current generated by the corrosion sensor;
An outdoor structure comprising a corrosion detection device having a variable resistance for changing the corrosion current. In claim 1,
Furthermore, the outdoor structure characterized by having an environmental monitor which measures the installation environment of a corrosion sensor. In claim 2,
An outdoor structure, wherein the environmental monitor is at least one of a hygrometer, a thermometer, and an illuminometer.

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