JPS61128151A - Apparatus for diagnosis of coating deterioration - Google Patents

Abstract

PURPOSE:To enable the diagnosis of the change in coating deterioration with the elapse of time in a non-destructive method, by providing an electrode for sending the signal from an operation part and an electrode part for holding an electrolyter to the film surface measuring part of coating machinery. CONSTITUTION:A diagnostic apparatus has an electrode for sending the signal from an operation part E through a detection part D to the measuring part of a film surface A of coating machinery and an electrode part B for holding an electrolyte. When a measuring condition and a treatment mode are indicated from the keyboard of a control part F, a measuring signal is sent to the electrode part B from the synthesizer of the operation part E through the detection part B. The response signal to said signal is returned to the electrode part B through the detection part D to measure impedance and sent to a control data analysis part F to be stored. Next, reference data for the judgement of deterioration is called out from a data base G to perform comparing judgement of measured data and the result thereof is printed out from an output part H. By this method, the change in coating deterioration with the elapse of time can be diagnosed in a non-destructive manner.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a coating deterioration diagnosing device capable of diagnosing changes in coating deterioration over time using a non-destructive method.

(Prior art) When the anti-corrosion coating film is used in the environment of each rod, substances in the environment permeate into the film and deterioration progresses at the interface between the coated object and the film. Localized destruction is known to occur.

When inspecting the deterioration status of the coating film using this method,
The following method has been implemented:

1) The inspection method for the coating film breakdown is the wet pinhole test (DC method, AC method) and the dry pinhole test (DC method, AC method, pulse method) as shown in Figure 7 or j! !
It is used in the manner shown in Figure 10.

The glove 3 is applied to the surface of the coating film 20 applied on the object 1 to be coated, and the probe 5 is scanned over the coating surface while applying voltage to the power source 4 to detect leakage at the broken part of the coating film. The current is detected by installing an ammeter 5.

2) For destructive testing, samples of coated products that have been used for a certain period of time are taken from actual equipment, and the adhesion of the coating film and the state of rust on the contact interface are investigated to diagnose the state of deterioration of the coating film.

(Conventional method\disadvantages) In wet and dry pinhole tests, signals cannot be detected unless the coating film is destroyed.
It is not possible to know the coating deterioration process up to failure. Therefore, this test alone cannot predict the lifespan of the coating.

2) Destructive testing is necessary to understand the changes in deterioration over time and the state of damage to the contact interface, but problems with the reliability and reproducibility of the tests occur due to the sampling method.

5) Destructive testing requires large sampling costs;
Not economical.

(Problems to be Solved by the Invention) The present invention seeks to provide a device capable of diagnosing changes in coating deterioration over time using a non-destructive method in order to improve the reliability of coating equipment and to properly manage maintenance. It is.

(Means for Solving the Problems) The present invention is to diagnose the deterioration phenomenon inside the coating from the frequency characteristics of impedance until local destruction of the coating film occurs. , all tasks such as measurement, calculation, data analysis, and determination of deterioration details were automated, leaving the operator only to set the electrode and take it out after diagnosis. 4) The detection section has a circuit configuration that allows automatic zero adjustment in order to reduce measurement errors due to stray capacitance and residual impedance between measurement terminals. 1.
Features.

That is, the present invention includes: (1) an electrode section that holds an electrode and an electrolyte for sending signals from a calculation section (described later) to a film surface measuring section of a coating device via a detection section (described later); an electrolytic solution supply section that is connected to supply an electrolytic solution to the electrode section; ■ a detection section that is connected to a measurement terminal of the calculation section described later, a terminal of the electrode section and a terminal of the coating equipment; a calculation section that calculates the impedance after sending a measurement signal to the electrode section and receiving a response signal from the coating equipment via the detection section; ■ Control of the electrolyte supply section; measurement of the calculation section; control,
A control/data analysis section has functions such as analysis of the impedance output from the calculation section into each parameter, comparison judgment with the database, and defect mode analysis for classifying C-deterioration contents■ Data analysis is completed. Output section that outputs data = 9
This is a coating deterioration diagnostic device characterized by:

The present invention can be advantageously applied as an apparatus for diagnosing deterioration of organic coatings, an apparatus for evaluating corrosion resistance of inorganic coatings (ceramics), and an apparatus for evaluating sealing treatment of anodic oxide films.

(composition FIG. 1 shows a block diagram of the diagnostic device of the present invention.

In the system configuration, A is the coating film surface of the coating equipment to be diagnosed, B is the electrode part, and the electrode and electrolyte are used to send signals from the calculation part (impedance analyzer) K to the measurement part via the detection part. It consists of a device for holding. (Details will be explained in detail with reference to Figures 2 and 3.) C is an electrolyte supply unit for supplying electrolyte to the electrode part B, and is composed of a pump, a tank, an overflow switch, and a 0N10FF control circuit for the pump. and is connected to the control data analysis section F. D is the above-mentioned detection section, which is a circuit that prevents measurement errors with lead wires and equipment that is in a grounded state. is connected to.

(2) is the above-described calculation unit (impedance analyzer) that sends a measurement signal to the electrode unit via the detection unit Dt-, and
After receiving the response signal from coating equipment A via the detection section, it is calculated into impedance. F is the control/f-event analysis department, a partial computer,)
Consists of a four-way disc and a CRT display,
■ Control of completion of electrolyte supply, ■ Measurement control of calculation unit E, ■ Analysis of impedance output from calculation unit E into each parameter, ■ Defect mode for classifying F-deterioration content for comparison with database G. It has an analysis function.

G is a database in which various data for determining deterioration are stored, and the necessary data is provided based on the instructions of the control data analysis sF. H is an output unit such as a printer or plotter 129, which outputs the data after data analysis has been completed.

FIG. 2 shows the structure of the electrode section when measuring the inner surface of a heat exchanger tube. Here, 1 is the electrode that also serves as the electrolyte introduction tube, and 2
3 is a sealing member for preventing electrolyte leakage; 3 is a tightening screw 4 for fixing the sealing member 2; 5 is an insulating seal for the non-measuring part of the electrolyte introduction tube; 5 is an electrolyte supply port; 1
The electrolytic solution supplied in the direction of the arrow enters the measuring section from this part. 6 detects that the supply of electrolyte to the measuring section is completed by an overflow sensor. 7 is a measurement terminal.

Figure 8g5 shows the structure of the electrode section when measuring a planar object. Here, 31 is the object to be coated, 32 is the coating film, 35 is the electrode part casing, 34 is the electrode, 35 is the electrode terminal, 36 is the electrolyte leak prevention seal member, 37 is the electrolyte supply pipe, and 5B is the overflow. It is a sensor.

(Function) When diagnosing the deterioration of coating equipment, the operator sets the electrode part B on the part to be measured, that is, the coating film surface A of the coating equipment, connects the entire system shown in Figure 1, and then presses the keyboard of the control part F. When a start command is sent, the pump of electrolyte supply section C is activated,
An electrolytic solution is supplied to the electric mark part of the electrode part B. When electrode part B is filled with the required amount of electrolyte, the overflow switch is activated by a signal from the over70-sensor, and the pump drive is stopped.At the same time, a signal indicating that electrolyte supply is complete is sent to control part y, and measurement preparation is completed. do.

For measurement, when the measurement conditions and processing mode are instructed from the keyboard of the control section F, a signal (dotted line) of the designated frequency is sent from the synthesizer of the calculation section (impedance analyzer) E to the electrode section B via the detection section. The response signal (solid line) to this signal is returned to the calculation gK via the detection section, the impedance is measured, and the control data analysis section ? is sent to and stored.

Thereafter, the impedance of each frequency is measured and stored while automatically changing the measurement frequency from a low frequency to a high frequency. Once the impedance measurement in the specified frequency range is completed, data analysis for each parameter is performed. Next, reference data for deterioration judgment is called from database G,
Deterioration classification is performed by comparing and determining the measured data.

When the above operations are completed, the data analysis results and deterioration classification are printed out from the output unit H.

(Effects) 1) The measurement work was completely automated except for setting the electrodes, so the operator's work was greatly reduced.

2) The frequency characteristics of impedance can be clearly detected and the state of deterioration at the coating film and the interface between the coating film and the object to be coated can be determined, improving the reliability of deterioration diagnosis.

Immediate diagnostic results facilitate feedback on coating equipment maintenance work.9.

4. Diagnosis results are stored on a floppy disk, making long-term maintenance management easier.

In the above explanation, the method of holding the electrolyte in the electrode part is to fill the electrode part space with liquid, but in addition to this, a water-absorbing material that does not form voids can also be used, and it can also be used in the calculation part. In addition to impedance analyzers, there are also devices for
alyzer: transfer function analyzer) and FFT
(lPa5t F'ourier Transform
: A fast Fourier transformer) can also be used.

EXAMPLE Diagnosis was carried out on a heat exchanger whose inner surface of the tube was coated with epoxy phenol resin using the system configuration shown in FIG. 1 except that the database section Gl was removed. The electrode structure is as shown in Figure 2, and L in Figure 4.
I set it to sea urchin.

In Fig. 4, 41 is a carbon steel pipe, 42 is an epoxy/phenol coating, 45 is an electrode that also serves as an electrolyte introduction pipe,
44 is an electrolytic solution supply hose, 55 is an electrolytic solution filled in an electrode portion, 46 is an electrode terminal, and 47 is a ground terminal.

The impedance was measured at a measurement frequency of 5 Hg to 10 kHz. Examples of the measurement results and destructive test results are shown below.

Figure 5 shows the impedance of the new pipe coating, and Figure 6 shows the impedance of the coated pipe after 15 years of use. Figure 7 shows the tan δ value of the fresh snow coating analyzed from the impedance, and Figure 8 shows the tan δ value obtained from the same analysis.
This is the tan δ value of the coated tube after 5 years of use. From these results, the tube after 15 years of use is 5 to 5
It can be seen that the tan δ value increases in the frequency range of 0)11g.

On the other hand, in order to investigate the relationship between this increase in tanδ value and coating deterioration, we removed the tube from the heat exchanger and conducted a destructive test. As a result, corrosion had occurred at the adhesive interface of the coated tube that had been used for 16 years, and the adhesive My friend's strength is also decreasing.

From the above results, it has been found that the deterioration state of coating equipment can be determined using a non-destructive method by applying the diagnostic device of the present invention.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the diagnostic device of the present invention, Fig. 2 is a diagram showing an embodiment of the structure of the electrode section used in the diagnostic device of the present invention when measuring the inner surface of a tube, and Fig. 3 is a block diagram of a flat object. FIG. 4 is a diagram showing an embodiment of the structure of the electrode section used in the diagnostic device of the present invention when measuring an object. FIG. 4 is a diagram showing the electrode section having the structure shown in FIG. Figure 5 is the impedance of the fresh snow coating, Figure 6 is the impedance of the coated pipe after 13 years of use, Figure 7 is the tan δ value of the new pipe coating analyzed from the impedance, and Figure 8 is the 13 years of use obtained from the same analysis. The tan δ values of the subsequent coated tubes are shown. FIG. 9 and FIG. 10 are diagrams showing a conventional coating film inspection method. Sub-agent Yen 1) Meikoku agent Ryo Hagiwara - Figure 5 Figure 6 Figure 7 Figure 8 Surroundings (KHz)
' 1 anti cheap su
(Hemon 2) Figure 9 Figure 10

Claims (1)

[Claims] (1) An electrode section that holds an electrode and an electrolyte for sending a signal from a calculation section (described later) to a coating surface measuring section of a coating device via a detection section (described later); (2) an electrode section (described later) (3) a detection section connected to the measurement terminal of the calculation section described later, the terminal of the electrode section, and the terminal of the coating equipment; , (4) a calculation unit that sends a measurement signal to the electrode unit via the detection unit and receives a response signal from the coating equipment via the detection unit, and then calculates the impedance; (5) the electrolysis unit; A control that has functions such as control of the liquid supply section, measurement control of the calculation section, analysis of each parameter of impedance output from the calculation section, and defect mode analysis for classifying the deterioration content by comparison with the database. - A coating deterioration diagnostic device comprising: a data analysis section; and (6) an output section that outputs data after data analysis has been completed.