JPH04324342A - Method for diagnosing deterioration of coated film - Google Patents

Abstract

PURPOSE:To easily diagnose the deterioration of a coated film with accuracy by preventing measurements from being affected by subjectivity. CONSTITUTION:While a voltage is applied between a probe 2 and substrate metal 5 from a voltage applying means 7, the electric current flowing to a circuit is measured by means of a current measuring means 6. On the other hand, the current values obtained by actually measuring test pieces to which repainting is required and which are prepared by painting systems are stored in a storing means 9 as deterioration discriminating reference values. A comparing means 10 discriminates the deterioration of a coated film 1 by comparing the current value obtained by means of the means 6 with the reference value stored in the means 9 and displays the discriminated result on a displaying means 11.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paint film deterioration diagnosing device for objectively determining the deterioration of paint films formed on equipment installed outdoors such as transformers and switchboards.

0003

2. Description of the Related Art Equipment installed outdoors, such as transformers and switchboards, is coated with a coating to prevent corrosion and improve appearance. However, this coating deteriorates over time due to the effects of UV rays and moisture. If such deterioration of the paint film is left unaddressed, the paint film will eventually peel off and the underlying metal will corrode. Therefore, in order to maintain the equipment, it is necessary to repaint it at an appropriate time and apply a new paint film. need to be formed. Therefore, conventionally, in this type of equipment, the degree of deterioration of the paint film has been periodically diagnosed to determine the appropriate time for repainting. It is desirable that this paint film deterioration diagnosis be made as objectively as possible so that appropriate judgments are always made no matter who performs it. Conventional paint film deterioration diagnosis methods that take this point into consideration include the following.

[0004] First, a large number of sample photographs of various deterioration conditions such as peeling, cracking, blistering, rust, etc. are prepared in advance, and the degree of deterioration varies in stages, and these sample photographs are compared with the actual coating film. A person makes a comparative observation. Then, for each type of deterioration, the worker determines which sample photo the actual paint film matches, and also assigns predetermined scores for each type of deterioration and degree of deterioration, and adds these up in sequence. do. If the total score reaches the standard value, it is determined that it is time for repainting or repair painting.

[0005] There is also the following method as another method. This method utilizes the fact that the impedance of the paint film changes as the paint film deteriorates, and its outline is as follows. That is, a probe is applied to the coating film formed on the base metal, a voltage of each frequency is applied between the probe and the base metal, and the impedance measured according to the current flowing through the probe is measured from the instrument. Read and write down. Next, it is checked to see which columns of the table prepared in advance correspond to the impedances recorded at various frequencies, and the degree of deterioration of the coating film is determined based on this.

[0006]

[Problem to be Solved by the Invention] However, in the former method of comparing and observing the actual paint film and a sample photo, it is up to the observer to decide whether or not the state of the actual paint film matches the sample photo. Since it is easily influenced by subjectivity, there is no guarantee that an appropriate diagnosis can be made. For this reason, the diagnostic results tend to be ignored, and as a result, repainting or repair painting may not be performed at an appropriate time. Furthermore, this method requires comparative observation with many sample photos, totaling of scores, etc. These tasks are troublesome and may lead to calculation errors.

[0007] In the latter method of measuring the impedance of a coating film, when reading the impedance, a reading error may occur due to the subjectivity of the measurer, and in addition, the work of comparing the measured value with the evaluation standard is troublesome. There is also a drawback.

[0008] The present invention has been made in view of the above circumstances, and its purpose is to
It is an object of the present invention to provide a paint film deterioration diagnosis method that allows accurate diagnosis to be easily performed.

[Configuration of the invention]

0010

[Means for Solving the Problems] The paint film deterioration diagnosing device of the present invention includes a probe that is directed to the surface of the paint film, and a voltage that applies a predetermined voltage between the base metal of the paint film and the probe. An applying means, a current measuring means for measuring the current flowing to the probe through the coating film, and a current value obtained by actually measuring a test piece prepared for each paint system in a state requiring repainting as a deterioration judgment reference value. A storage means that stores the information as
The present invention is characterized in that it includes a comparison means for comparing the deterioration judgment reference value of the storage means and the current value obtained by the current measurement means, and a display means for displaying the comparison judgment result.

[0011]

[Operation] When a voltage is applied between the base metal and the probe by the voltage applying means, a current flows through the coating through the probe and is measured by the current measuring means. On the other hand, since it is known that there is a correlation between the current flowing through the paint film and the degree of deterioration of the paint film, the current value measured by the current measuring means and the deterioration judgment criteria stored in the storage means Since the values are compared by the comparison means and the results of the comparison are displayed by the display means, there is no subjective intervention, and accurate paint film deterioration diagnosis can be easily performed.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. A probe 2 is directed to the surface of the coating film 1 to be diagnosed for deterioration. This probe 2 is known to have various structures (for example, JP-A-61
(No. 108954) Although not shown in detail, it basically has a structure in which a sponge-like electrode 4 impregnated with conductive gel is housed in the main container 3, and a permanent magnet is provided around the opening of the main container 3. The sponge-like electrode 4 is brought into close contact with the surface of the coating film 1 by the attractive force acting between the permanent magnet and the base metal 5.

The electric wire led out from the probe 2 is connected to a preamplifier 6, and the electric wire led out from the base metal 5 is connected to a voltage generator (hereinafter referred to as OSC 7). OS
C7 is between 0.01 and 1 between base metal 5 and probe 2.
It functions as a voltage applying means that applies a voltage at a certain frequency between 00 Hz and 00 Hz. When a voltage is applied between the probe 2 and the base metal 5 by this OSC 7, the preamplifier 6 extracts a voltage signal corresponding to the current flowing through the coating film 1 and gives this voltage signal to the A/D converter 8. It has become. That is, the preamplifier 6 functions as a current measuring means for measuring the current flowing to the probe 2 through the coating film 1.

Deterioration judgment reference values are stored in the storage means, for example ROM 9. This deterioration judgment standard value is
This is the current value obtained by actually measuring a test piece whose paint film has deteriorated and requires repainting, and the value differs depending on the paint system as shown in FIG. 3. The signal given to the A/D converter 8 is then transmitted to the CPU 10, which is a comparison means. The CPU 10 is configured to compare the deterioration determination reference value with the signal from the A/D converter 8, and display the comparison and determination result on an LCD 11 serving as a display means.

Next, a procedure for diagnosing deterioration of the coating film 1 will be explained. First, the paint film deterioration diagnosis device shown in FIG. 1 is brought to the site, and the probe 2 is applied to the surface of the paint film 1. Then, the OSC 7 applies a voltage at a certain frequency between 0.01 and 100 Hz between the probe 2 and the base metal 5. In this case, it is known that the current flowing through the coating film 1 has a correlation with the deterioration time of the coating film 1 in the above frequency range. In other words, if there is a correlation between the current flowing through the coating film 1 and the deterioration time t, it is possible to easily and accurately determine the deterioration described below.

As mentioned above, a voltage at a certain frequency between 0.01 and 100 Hz is applied to the probe 2 and the base metal 5.
When a current is applied between the two, a current corresponding to the degree of deterioration of the coating film 1 flows through the circuit. Then, that voltage signal is sent to the preamplifier 6.
The digital signal is extracted by the A/D converter 8, converted into a digital signal, and transmitted to the CPU 10. In the CPU 10, this voltage signal is compared with the deterioration judgment reference value stored in the ROM 9, and as shown in FIG. 2, if the voltage signal is larger than the deterioration judgment reference value (indicated by IC in FIG. 2), , it is determined that the coating film 1 needs to be repainted, and this is displayed on the LCD 11. Conversely, if the voltage signal is smaller than the deterioration determination reference value, it is determined that the coating film 1 is normal, and this is displayed on the LCD 11.

As described above, in the above embodiment, a voltage is applied between the probe 2 and the base metal 5 by the OSC 7, and the current flowing through the circuit is measured by the preamplifier 6.
In the PU 10, deterioration is determined by comparing this current value with a deterioration determination reference value, and the result is displayed on the LCD 11.
It is designed to be displayed on the screen. Therefore, no matter who performs the operation, it is always possible to objectively judge the deterioration of the coating film, and moreover, the work can be performed easily and accurately.

[0018]

As is clear from the above description, the paint film deterioration diagnosing device of the present invention uses a probe directed to the surface of a paint film, and a predetermined voltage applied between the base metal of the paint film and the probe. a voltage applying means for applying a voltage between the probes, and a current measuring means for measuring the current flowing through the coating film to the probe;
A storage means that stores a current value obtained by actually measuring a test piece in a state requiring repainting prepared for each paint system as a deterioration judgment reference value, and a deterioration judgment reference value of this storage means and the current measuring means. Since it is equipped with a comparison means for comparing the current value and a display means for displaying the comparison judgment result, it is possible to prevent the subjective intervention of the measurer, and as a result,
This has the excellent effect of making it easy to accurately diagnose paint film deterioration.

[Brief explanation of drawings]

FIG. 1: Overall block diagram showing one embodiment of the present invention

[Figure 2] Diagram showing the relationship between presence or absence of repainting and current value

[Figure 3]
Diagram showing deterioration criteria values for various paint systems

[Explanation of symbols]

1 is a coating film, 2 is a probe, 5 is a base metal, 6 is a preamplifier (current measurement means), 7 is an OSC (voltage application means), 8
is an A/D converter, 9 is a ROM (storage means), and 10 is a CP
U (comparison means) and 11 indicate LCD (display means).

Claims (1)

[Claims] 1. A probe directed to the surface of a coating film, voltage applying means for applying a predetermined voltage between the base metal of the coating film and the probe, and a current flowing to the probe through the coating film. A current measuring means to be measured, a storage means for storing the current value obtained by actually measuring a test piece prepared for each paint system in a state requiring repainting as a deterioration judgment standard value, and a deterioration judgment standard for this storage means. A coating film deterioration diagnosing device comprising a comparison means for comparing the value with the current value obtained by the current measurement means, and a display means for displaying the comparison judgment result.