JPH09126990A - Test piece for environmental survey - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an evaluating method for easily specifying the type and concentration of corrosive gas by adopting a constitution to cover the part of a test piece with a transparent protective film which is invariable in transparency and non-releasable even if it is left to stand. SOLUTION: The test piece 4 is covered at one or both ends or the surface with a transparent protective film 41 of circular shape or the like, and the external appearance showing the state of the piece 4 at the time of manufacturing is preserved on the covering part by the film 41. The piece 4 is formed out of a metal piece such as copper, silver, an iron-nickel alloy, aluminum or iron corresponding to a comparison metal test piece. The transparent film 41 is formed out of an inorganic oxide film of SiO2 . In or So-covered in thickness of 300Å or more by a sputtering method or depositing method or an organic polymer film formed by partial painting such as masking or dipping or screen printing. The transparent film 41 of the piece 4 has excellent weather resistance to corrosive gas. Even if the film 41 is left to stand for a long period in an environment of the corrosive gas, its transparency is not lost, and the film 41 is not released from the surface of the piece.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an environmental evaluation method for investigating corrosive gases and the like present in a place where various electronic devices are installed or stored, and particularly to a surface condition before and after being left in the environment. The present invention relates to a test piece for environmental research that facilitates comparison with the surface condition.

Electronic equipment is generally installed or stored indoors, but the conductors and contact points inside are mainly composed of metals including copper and silver, and the surrounding environment is corroded by sulfurous acid gas, hydrogen sulfide, chlorine and the like. If a volatile gas is present, it may cause disconnection or poor contact.

When the environment is expected to be bad in order to deal with such a failure, a test piece for environmental investigation (hereinafter simply referred to as a test piece) is left in that place for a certain period of time,
Environmental measures that identify the type and concentration of intervening corrosive gas are taken and measures are taken in advance.

However, a special technique is required to analyze the corroded test piece and to identify the type and concentration of the corrosive gas present. Therefore, it is desired to develop an evaluation method that can identify the type and concentration of corrosive gas relatively easily and a test piece suitable for the evaluation method.

[0005]

2. Description of the Related Art FIG. 2 shows a conventional corrosive gas measuring kit, and FIG. 3 shows an example of an attached color sample.

[0006] A plurality of kinds of metal pieces were left for a certain period of time in each of a plurality of environments in which the kinds, concentrations and relative humidity of corrosive gases such as sulfurous acid gas, hydrogen sulfide and chlorine were preset. Comparing the appearances of a plurality of comparative metal test pieces, and the appearance of the test piece made of the same metal as the comparative metal test piece left for a certain time in the environment where the electric / electronic device is installed / stored, A patent has already been filed that specifies the type, concentration and relative humidity of corrosive gas in the installation / storage environment of the electric / electronic device (Japanese Patent Laid-Open No. 4-324356).

The type, concentration and relative humidity of the corrosive gas are specified by comparing the appearances of the metal test piece for comparison and the test piece that has been left for a certain period of time in the environment where the electric and electronic devices are installed and stored. The method does not require special technology, and the environment can be evaluated relatively easily.

However, it is necessary to store the comparative metal test piece in a container that can be hermetically sealed so that the appearance does not change during storage, and a place for storing the comparative metal test piece is necessary. It is also unsuitable for environmental evaluation in remote areas where transportation is difficult.

Then, as means for further simplifying the environmental evaluation, a test piece 1 and a storage container 2 made of a plurality of kinds of metal pieces as shown in FIG. 2, and a color sample 3 used in place of the metal test piece for comparison. A corrosive gas measurement kit including the above is commercially available.

The test piece 1 is made of copper, silver, aluminum, iron, and other plural kinds of metal pieces corresponding to the comparative metal test piece, and individually vacuum-packed in order to prevent appearance change during storage and a packaging material. The storage warranty period is limited to 2 years in consideration of the deterioration of.

The storage container 2 made of transparent plastic has a pocket 21 for storing the test piece 1 made of a plurality of kinds of metal pieces, a cover 22 for securing a sufficient space around the test piece 1 and a pillar, etc. It has a through hole 23 for hooking to.

The color sample 3 uses as a master a comparative metal test piece prepared by leaving a plurality of kinds of metal pieces in each of the plurality of environments for 30 days, depending on the material of the metal piece and the type and concentration of corrosive gas. The same color tone as that of the different master surfaces is printed on a white high-quality paper.

For example, as shown in FIG. 3, the judgment column 31 for specifying the type of corrosive gas clearly shows the metal piece that is discolored by the corrosive gas, and the concentration judgment column 32 for estimating the concentration of the corrosive gas is shown. The color tone of the master surface, which changes with each density, is printed.

That is, when the environment is evaluated, the test piece 1 made of a plurality of kinds of metal pieces is taken out of the bag, set in the storage container 2 at the same time, and the storage container 2 is hooked at an appropriate position in the evaluation environment so that all the test pieces are tested. 1 is left in the evaluation environment for 30 days.

After being left for 30 days, the appearances of a plurality of types of test pieces 1 are compared with the color tones printed on the color sample 3 to identify the type of corrosive gas present in the evaluation environment and to determine the corrosive gas. The reference concentration can be estimated very easily.

[0016]

However, it is difficult for the color sample printed with the color tone of the master surface to express even the metallic luster and surface irregularities of the comparative metal test piece, and the appearance change of the test piece 1 is small. In such a case, the estimation of the concentration of corrosive gas may be erroneous due to the metallic luster or surface irregularities.

Particularly in an emergency case, an environmental survey or the like does not allow a 30-day neglect period, and therefore evaluation is performed by neglecting the term. In such a case, there is a problem that it is often evaluated by a slight change in the test piece and cannot be estimated only by the color sample.

An object of the present invention is to provide an evaluation method capable of specifying the type and concentration of corrosive gas relatively easily and a test piece suitable for the evaluation method.

[0019]

FIG. 1 is a perspective view showing a test piece according to the present invention. Note that the same object is denoted by the same symbol throughout the drawings.

The above-mentioned problem is that after leaving for a certain period of time in an environment where various devices are installed or stored, a comparative metal test piece prepared in an environment in which the type and concentration of corrosive gas are known, or the comparative metal test piece. A test piece for estimating the type and concentration of the corrosive gas present in the environment, which is compared with the comparative test data in accordance with the above, and is capable of peeling without loss of transparency even when left in the environment. This is achieved by the test piece 4 of the present invention in which a part of the area is covered with the transparent protective film 41 which is not present, and the appearance before being left in the environment is preserved in the area covered with the protective film.

As shown in the figure, by attaching a transparent protective film 41 which does not peel off without losing transparency even when corrosive gas is present, the appearance of the test piece 4 before being left in the environment can be improved. It can be stored in the area covered by the transparent protective film 41.

By preserving the appearance before being left in the environment in a part of the test piece 4 which has been left in the environment and has changed color, a delicate color tone can be obtained without being confused by metallic luster or surface irregularities. Changes can be identified and compared to the color sample.

Moreover, the appearance before shipping is preserved for a long time by depositing the protective film 41 on a partial area of the test piece 4 before shipping, and vacuum packaging is caused due to an accident during transportation or storage. Even if it is broken, it can be determined whether or not it can be used by comparing the color tone with the exposed part.

In the case of the test piece attached to the conventional corrosive gas measurement kit, the storage guarantee period is limited to 2 years, but the storage guarantee is ensured by storing the appearance before shipment on the test piece. It is possible to determine whether or not the device can be used even after the period has expired.

That is, it is possible to realize an evaluation method and a test piece suitable for the evaluation method that can specify the type and concentration of the corrosive gas relatively easily.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. The test piece according to the present invention is shown in FIG.
(a), as shown in FIG. 1 (b), one end or both ends are covered with a transparent protective film 41, and one end or both ends covered with the protective film 41 shows a state when the test piece 4 is manufactured. The appearance is preserved.

The test piece 4 is formed of a metal piece of copper, silver, iron-nickel alloy, aluminum, iron or the like corresponding to the metal test piece for comparison, and although not shown in the figure, each of them is used to prevent a change in appearance during storage. The test piece 4 is put in a bag and tightly vacuum-packed.

The transparent protective film 41 is formed of, for example, a sputtering method or a vapor deposition method, and is made of SiO ₂ or I deposited to a thickness of 300 Å or more.
It is formed of an inorganic oxide film of n, Sn or the like, or an organic polymer film formed by partial coating such as masking or dipping or screen printing.

The transparent protective film 41 adhered to the surface of the environmental inspection test piece 4 by such a method has excellent weather resistance against corrosive gas, and is long-term in an environment where corrosive gas is present. It does not peel off from the surface of the test piece without losing transparency even when left alone.

The coating with the protective film 41 does not have to be limited to one end or both ends of the test piece 4 as shown in FIGS. 1 (a) and 1 (b). For example, as shown in FIG. A shape made of a protective film 41 such as a circle or a triangle may be formed on the surface of the intermediate portion of the piece 4.

All the test pieces 1 are set by simultaneously setting the test pieces 4 composed of a plurality of kinds of metal pieces taken out in the evaluation of the environment in the storage container 2 and hooking the storage container 2 at an appropriate position in the evaluation environment. Is left in the evaluation environment for 30 days.

By comparing the appearances of a plurality of types of test pieces 4 after being left for 30 days with the color tones on the color sample 3, the type of corrosive gas intervening in the evaluation environment can be specified and at the same time the corrosive gas The reference concentration can be estimated very easily.

Although it is difficult to express even the metallic luster of the comparative metal test piece and the unevenness of the surface on the color sample printed on the high-quality paper on a white background, the test piece 4 of the present invention has an appearance at the time of manufacture. Color sample 3 because it is stored on the same surface
Can be referred to when comparing with.

For example, in the conventional method, a slight change in appearance may be missed due to metallic luster or surface irregularities, and the concentration of corrosive gas may be erroneously estimated. Subtle changes in color can be identified without being confused by.

As a result, it is possible to judge whether or not the test piece can be used by comparing the surface states of the test pieces taken out in the environmental evaluation, and the accuracy and the standard of the corrosive gas when the type of corrosive gas to be present is specified. The accuracy in estimating the concentration can be improved.

By storing the appearance before being left in the environment on the same surface of the test piece that has been left in the environment for a certain period of time and discolored, it is possible to obtain a delicate color tone without being confused by the metallic luster or surface irregularities. Changes can be identified and compared to the color sample.

Moreover, the appearance before shipping is preserved for a long time by depositing the protective film 41 on a partial area of the test piece 4 before shipping, and vacuum packaging is caused due to accidents during transportation or storage. Even if it is broken, it can be determined whether or not it can be used by comparing the color tone with the exposed part.

In the case of the test piece attached to the conventional corrosive gas measurement kit, the storage guarantee period is limited to 2 years, but the test piece according to the present invention should retain the appearance before shipment. It is also possible to determine whether or not the product can be used after the storage warranty period has expired.

That is, it is possible to realize an evaluation method and a test piece suitable for it, which can specify the type and concentration of corrosive gas relatively easily.

[0040]

As described above, according to the present invention, it is possible to provide an evaluation method by which the type and concentration of corrosive gas can be specified relatively easily and a test piece suitable for the evaluation method.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a test piece according to the present invention.

FIG. 2 is a view showing a conventional corrosive gas measurement kit.

FIG. 3 is a diagram showing an example of an attached color sample.

[Explanation of symbols]

 2 Storage container 3 Color sample 4 Test piece 41 Protective film

Claims (2)

[Claims] 1. A comparative metal test piece prepared in an environment in which the type and concentration of corrosive gas is known after being left for a certain period in an environment where various devices are installed or stored, or the comparative metal test piece. An environmental investigation test piece for estimating the type and concentration of corrosive gas present in the environment, which is compared with a compliant comparative test material, and peels without loss of transparency even when left in the environment. Part of the area is covered with a transparent protective film
A test piece for environmental research, wherein an appearance before being left in the environment is preserved in a region covered with the protective film. 2. The transparent protective film for preserving the state before being left in the environment is composed of an inorganic oxide film deposited by a sputtering method or a vapor deposition method, or a partially coated organic polymer film. The test piece for environmental research according to claim 1.