JP3277223B2 - Rust stabilization degree evaluation method and rust stabilization degree measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This application invention relates to the stabilization evaluation method of rust to determine the state of rust generated on the metal material surface, such as steel structures, also stabilization of the rust evaluation relates rust stabilizer measuring apparatus having a probe and various functional devices for carrying out the.

[0002]

2. Description of the Related Art Conventionally, materials for corrosion-resistant steel have been developed in order to substantially suppress or reduce metal corrosion, and on the other hand, whether material selection, quality control, or acceptable quality standards are met. In order to judge the corrosion, various corrosion standards and methods for testing the corrosion of materials for that purpose are defined. In this test method, there is an evaluation of the degree of corrosion during inspection after a certain period of time or during use, and recently, prediction of life and remaining life has been included in the test items.

[0003] Evaluation of corrosion of metallic materials, but have been a problem from various point of view also in the conventional method as described above, a "stabilized degree of rust" for this evaluation become important matters I have. This is because of the "rust" associated with corrosion
This is because there is a large difference in the corrosion resistance as a structural material or the like depending on whether the metal surface is passivated and stabilized or whether the metal surface is further dissolved.

[0004] Conventionally, as a method of measuring such rust stabilization degree regarding steel or the like, is known by impedance measurements. For example, in a method of evaluating the corrosion resistance of a coated metal material (see Japanese Patent Application Laid-Open No. 2-102446), as shown in FIG. 4, a metal material (11) provided with a coating film is immersed in an electrolyte solution (12), After immersion in (12), the capacitance value and the resistance value at the time point before and after the elapse of a certain time were measured by the impedance meter (13), and as shown in FIGS. Capacitance values (C0, C1) and resistance values (R0, R1) during a certain period of time
The impedance measurement is performed by determining the amount of change due to the above, and the corrosion resistance is evaluated. In addition, the code | symbol (14) in FIG. 4 is a power supply device.

According to this method, the change in capacitance and resistance can be determined within a short time within 24 hours, and the corrosion resistance coefficient can be determined. Therefore, the evaluation can be performed quickly, whereby quality control can be performed accurately and reliably, and the work efficiency can be improved. It is possible to improve. However, as described above impedance For the evaluation of corrosion resistance measurement, stability and electric resistance circuit problem to be improved, such as the measuring apparatus of the measurement are also left still many, to obtain accurate results Was difficult. In addition, since the material to be measured, such as a metal material to be measured, must be immersed in an electrolyte solution, the size of the apparatus is large, and the apparatus cannot be carried around.

Therefore, the invention of this application solves the above-mentioned conventional problems, and can improve the measurement accuracy in a corrosion test of a steel structure or the like, and can perform the measurement accurately and quickly, and can easily perform the measurement on the spot. can be, it has an object to provide a new rust stabilizing degree (or corrosion resistant) evaluation method and the rust stabilization measuring apparatus.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention of this application is to adjust the surface potential of a metal material before and after attaching a small amount of moisture to rust generated on the surface. measured until subsequent drying from that point, the
Providing rust stabilization evaluation method (claim 1), characterized in that to evaluate the degree of stabilization of rust from the potential variation.

Further, the invention of the present application provides
In the chemical conversion evaluation method, an electric potential of an unpainted steel structure or the like is measured (claim 2).
In addition to the above, the evaluation method is characterized in that the potential is shifted in a noble direction or a base direction, and the evaluation method is characterized in that the surface of a steel structure or the like is passivated by rust. The present invention also provides an evaluation method (claim 4) characterized in that it is determined whether or not dissolution has occurred.

Furthermore the invention of this application, the a device for performing the stabilizing evaluation method of rust according to any, and the probe of the detection function member, a surface potential measuring device, an arithmetic device and recording device and, rust stabilizer measuring apparatus characterized by comprising a power supply (claim 5)
When, in this rust stabilization measuring apparatus, a probe as a detection function member, a surface potential measuring device, while storing the calculation device and the recording device in the accommodating box, portable housing the power supply in the housing box rust stabilization measuring apparatus being characterized in that the transportable (claim 6) are also provided.

As described above, according to the invention of this application, by measuring the potential fluctuation under the same conditions as in the actual environment until the aqueous solution is attached to the surface and dried, the surface is passivated by rust or dissolved. It is by taking the way to determine is happening, even more quickly and accurately evaluate rust stabilization evaluation method and rust stabilizing measuring apparatus which can be is provided conventionally.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the invention of this application will be described along with examples.

[0012]

DETAILED DESCRIPTION FIG. 1 is an illustration of a schematic configuration of a rust stabilization measuring apparatus A according to the invention of this application. For example, the rust stabilization measuring apparatus A, the probe (1), a surface potential measuring apparatus (2), micro-containing A / D converter
Processing unit (3), recording device using PC card or the like (4), and power supply device such as battery (5)
Is provided.

[0013] Then, the rust stabilization measurement apparatus A,
It is compactly stored in the storage box (6).
Such In use of the rust stabilization measuring apparatus A of the configuration, first surface applying a probe (1) on the surface of the metal material of steel structures such as the unpainted. Then, the surface potential at the site is detected, and a detection signal is transmitted. Upon receiving this detection signal, the surface potential measuring device (2) measures the surface potential at the corresponding location, the measured value measured by the micro processing unit (3) is processed, and the recording device (4) It is recorded on a recording medium (5) such as a PC card.

FIG. 2 shows a measurement of low-alloy steel such as SM steel and weather-resistant steel such as phosphorus-containing weather-resistant steel when exposed to outside air for one month and both surfaces are covered with rust. The results are shown. When tap water was attached to the surface using a 5 μl digital pipette, the change in potential appeared in a shifted form in the lower direction, and it was confirmed that a corrosion reaction had occurred on the surface of the steel material. On the other hand, FIG. 3 shows the result in the case of pure chromium, pure titanium and pure nickel which do not corrode, in which the potential appears to shift in a noble direction, indicating that no corrosion has occurred. Further, as shown in FIG. 2, even in the weather-resistant steel exposed to the outside air for 30 years, the potential appeared to shift in a noble direction, and it was confirmed that no corrosion occurred.

As described above, a comparison between the results of the potential measurement values obtained by testing various steel materials and the actual surface condition of the steel material indicates that the surface is covered with rust and corrosion is progressing. It is found that the potential appears to shift in a noble direction, and in the case of weather-resistant steel that does not corrode, the potential appears to shift in a noble direction, and is constant to the actual steel surface condition and the tendency of the potential change in measurement. It was confirmed that there was correspondence.

From the above, by measuring the surface potential of a metal material such as steel and detecting the moving direction of the potential, it is possible to judge the rust and the corrosion resistance of the surface. Since the surface potential is measured, the accuracy is high. Stability of rust formed on the surface can be obtained by attaching only one drop of tap water to the surface in a mild environment, for example, tap water in a mild environment, or a thin salt solution in a harsh environment near the coast . The degree (corrosion resistance) can be determined.

[0017]

According to the invention of the present application, an accurate evaluation value can be obtained, and the degree of stabilization of rust can be measured quickly and in situ on a structure such as an existing steel structure without destruction. As a result, it is possible to evaluate the remaining life due to corrosion damage of the existing steel structure and the like, and further, it is possible to save labor of work such as repair, so that a great economic effect can be achieved.

[0018] Also, the evaluation and measurement device can be housed in a storage case and can be compactly packed with the functional devices constituting the evaluation and measurement device. Therefore, a large-scale device such as a conventional storage tank for an electrolyte solution is required. Therefore, it is possible to reduce the size of the device and to provide a portable measuring device.

[Brief description of the drawings]

1 is a schematic diagram of a rust stabilization measuring apparatus.

FIG. 2 is a diagram showing a change in surface potential when water droplets are adhered to various low-alloy corrosion-resistant steels exposed.

FIG. 3 is a diagram showing a surface potential when water droplets are attached to various non-corrosive metals.

FIG. 4 shows a measuring apparatus using a conventional corrosion test method.

FIG. 5 is a graph showing a difference in increase rate due to a difference in conventional corrosion resistance.

[Explanation of symbols]

Micro processing unit 4 recording apparatus 5 Power supply 6 housing box A rust stabilizer measuring apparatus 11 coated metal material 12 electrolytic solution 13 Inpi dance meter 14 power supply including a probe 2 surface potential measuring unit 3 A / D converter

Claims (6)

(57) [Claims] The surface potential of claim 1 the metal material, measured prior to depositing the small amount of water to rust generated on the surface thereof, and from the time that was attached to dryness hereinafter, the potential variation
Rust stabilization evaluation method and evaluating the degree of stabilization of Karasabi. 2. The evaluation method of the rust stabilization evaluation method according to claim 1, characterized in that the steel structures such unpainted and so that potential measurement. 3. A stabilizing evaluation method of rust according to claim 1 or 2, or the potential is shifted in the direction of the noble, that it has to be determined by whether the shift in the direction of the less noble Characteristic evaluation method. And 4. The allowed claims 1 to rust stabilization evaluation method according to any one of 3, and so as to determine whether or dissolve the surface of such steel structures are passivated is occurring by rust An evaluation method characterized in that: 5. A device for performing the rust stabilization evaluation method according to any one of claims 1 to 4, and a probe as detection function member, a surface potential measuring device, an arithmetic device and a recording apparatus If, rust stabilizing measurement apparatus comprising the power supply. 6. The rust stabilizer measuring apparatus according to claim 5, and a probe as detection function member, a surface potential measuring device, while housed in the housing box and an arithmetic unit and a recording apparatus, the power supply within the storage box rust stabilization measuring apparatus characterized by accommodating the device was portable.