JPH05281179A - Method for evaluating corrosion resistance of material for can - Google Patents

Method for evaluating corrosion resistance of material for can

Info

Publication number
JPH05281179A
JPH05281179A JP10602792A JP10602792A JPH05281179A JP H05281179 A JPH05281179 A JP H05281179A JP 10602792 A JP10602792 A JP 10602792A JP 10602792 A JP10602792 A JP 10602792A JP H05281179 A JPH05281179 A JP H05281179A
Authority
JP
Japan
Prior art keywords
frequency
test
test material
corrosion resistance
counter electrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP10602792A
Other languages
Japanese (ja)
Other versions
JP3173523B2 (en
Inventor
Mikiyuki Ichiba
幹之 市場
Hiroki Iwasa
浩樹 岩佐
Toyofumi Watanabe
豊文 渡辺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Engineering Corp
Original Assignee
NKK Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NKK Corp filed Critical NKK Corp
Priority to JP10602792A priority Critical patent/JP3173523B2/en
Publication of JPH05281179A publication Critical patent/JPH05281179A/en
Application granted granted Critical
Publication of JP3173523B2 publication Critical patent/JP3173523B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PURPOSE:To evaluate corrosion resistance of a material for can quantitatively and accurately. CONSTITUTION:A test material of steel plate or can body where an organic covering used as the material for can is provided is laid out as a working electrode 4 within a test liquid solution and further a counter electrode 2 is laid out within the test liquid solution. Then, an AC voltage with an amplitude of 2mV-20mV and a frequency of 0.1MHz-1MHz is applied between the test material 4 and the counter electrode 2 while being polarized to an anode or being polarized to a cathode. The highest frequency, where phase shift of current which is measured by the counter electrode 2 in reference to the input current is equal to 45 deg., is obtained. The degree of deterioration of the test material is judged according to the obtained frequency value.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、飲料缶等の容器等に
用いる、内面塗装等によって有機被覆が施こされた塗装
鋼板または缶体等の缶用材料の耐食性評価法に関するも
のである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrosion resistance evaluation method for a can material such as a coated steel plate or a can body which is used for a container such as a beverage can or the like and has an organic coating applied by an inner coating or the like.

【0002】[0002]

【従来の技術】従来、行われて来た容器内面に用いる材
料の塗装後または被覆後の耐食性評価法は、官能試験に
近いものが一般的である。例えば、塗装後、クロスカッ
トまたはエリクセン等を行なった後、試験環境への暴露
または浸漬等を行ない、最終的には目視およびテープ剥
離により評価を行なうものである。官能試験的な方法
は、人為誤差などの誤差が大きく、評価が主観的になり
定量的な評価ができない。また、劣化原因の推定等の得
られた結果に対する解析が難しい等の欠点がある。
2. Description of the Related Art Conventionally, a corrosion resistance evaluation method after coating or coating of a material used for the inner surface of a container is generally close to a sensory test. For example, after coating, after cross-cutting or Erichsen etc., exposure or immersion in a test environment is carried out, and finally evaluation is performed by visual inspection and tape peeling. The sensory test method has a large error such as a human error, and the evaluation is subjective, so that the quantitative evaluation cannot be performed. In addition, there is a defect that it is difficult to analyze the obtained result such as estimation of the cause of deterioration.

【0003】実際に容器に内容物を詰めて、経時させ結
果をみる、実缶試験も行われているが、これは結果を得
るまでに時間がかかる欠点がある。
Although an actual can test is also conducted in which the contents are actually packed in a container and the results are observed over time, this has the drawback that it takes time to obtain the results.

【0004】塗装鋼板に交流を流して耐食性を評価する
方法も数多く提案されている。例えば、J.Electrochem.
Soc.,33,Vol.138,No.1,January(1991)。その大部分は、
容器の内面塗装のように、10μm 以下の膜厚の被膜では
なく、10μm 以上多くは数十μm の厚い膜厚の塗装を対
象にしたものであり、試験材に対して分極等を行わない
浸漬状態で、交流による測定を行ない耐食性の評価が可
能であるとしている。
Many methods of evaluating corrosion resistance by applying an alternating current to a coated steel sheet have been proposed. For example, J. Electrochem.
Soc., 33, Vol. 138, No. 1, January (1991). For the most part,
This is not a coating with a film thickness of 10 μm or less as in the case of coating the inner surface of a container, but a coating with a film thickness of 10 μm or more, which is thicker than a few tens of μm. It is said that it is possible to evaluate corrosion resistance by measuring with AC in the state.

【0005】容器の内面に用いる材料の塗装後または被
覆後の耐食性評価に交流を用いた例も僅かながら報告さ
れている。これらは、例えば腐食防食討論会 87-A131に
示されるように、試験材の総インピーダンスの変化だけ
で耐食性を評価したものであったり、2nd North Ame. T
in Conf.,(1990) に示されるように、評価の目的が塗装
の有孔度であり、耐食性の評価ではないものである。
A few cases have been reported in which alternating current is used to evaluate the corrosion resistance of a material used for the inner surface of a container after coating or coating. These are, for example, those that evaluate corrosion resistance only by the change in the total impedance of the test material, as shown in 87-A131, the 2nd North Ame.
In Conf., (1990), the purpose of evaluation is the porosity of the coating, not the evaluation of corrosion resistance.

【0006】従来示されている例は、数μm 程度の薄い
塗膜を対象にしていないか、試験材に対して分極を行い
ながら交流による測定を行っていないか、または、位相
のずれが45°となる周波数を利用して評価していない
か、のいずれかに該当する。
In the examples shown in the prior art, a thin coating film of about several μm is not used, or the test material is not measured by alternating current while polarization, or the phase shift is 45%. Either the evaluation is not performed by using the frequency of ° or it falls under either.

【0007】また、従来の知見では、通常腐食している
塗装鋼板のアノードとカソードの腐食面積の割合は、ア
ノード1に対してカソード50以上といわれており、この
ような試験材について、交流を用いて測定した場合、劣
化特性 (特にカソード) が再現性良く、評価できるとい
うものであった。
Further, according to the conventional knowledge, the ratio of the corroded area of the anode and the cathode of the normally corroded coated steel sheet is said to be 50 or more of the cathode with respect to the anode 1, and the alternating current is applied to such a test material. When measured by using it, deterioration characteristics (especially cathode) were evaluated with good reproducibility.

【0008】[0008]

【発明が解決しようとする課題】交流を用いた塗装鋼板
の評価法のなかで、劣化塗膜部の抵抗と健全な塗膜部分
の容量であらわされる時定数の示す周波数を利用した評
価法が、感度の高い耐食性評価法であることから、我々
は、容器の内面に用いる材料の塗装後または被覆後の耐
食性評価に、この方法を用いることを試みた。しかしな
がら、アノードとカソードの腐食面積の割合は、1:60
以上と、通常腐食している塗装鋼板と同条件であったに
もかかわらず、再現性のある結果が殆ど得られなかっ
た。
Among the evaluation methods for coated steel sheets using alternating current, there is an evaluation method that uses the frequency indicated by the time constant expressed by the resistance of the deteriorated coating film portion and the capacity of the healthy coating film portion. Since it is a highly sensitive corrosion resistance evaluation method, we tried to use this method for the corrosion resistance evaluation of the material used for the inner surface of the container after coating or coating. However, the ratio of the corroded area between the anode and the cathode is 1:60.
From the above, reproducible results were hardly obtained, even under the same conditions as the normally corroded coated steel sheet.

【0009】従って、この発明の目的は、定量的に精度
良く缶用材料の耐食性評価をすることができる評価法を
提供することにある。
Therefore, an object of the present invention is to provide an evaluation method capable of quantitatively and accurately evaluating the corrosion resistance of a can material.

【0010】[0010]

【課題を解決するための手段】我々は、試験後の試験
材、および、試験結果を詳細に調査したところ、下記の
知見を得た。即ち、容器の内面に用いる塗装または被覆
による塗膜の膜厚は数μm と非常に薄く、このような場
合、アノード劣化部で容易に塗膜は破壊されることがわ
かった。そのときのアノード劣化部の塗膜の抵抗の大き
さは、カソード劣化部の抵抗に比較して、1/100 以下に
なっていることがわかった。容器内面に用いるような膜
厚数μm の薄い塗装鋼板の場合、面積的には、カソード
に比較して無視できるアノード劣化部が、交流を用いて
耐食性評価を行なう場合、その結果に大きな影響を及ぼ
すのである。
[Means for Solving the Problems] After detailed examination of the test materials after the test and the test results, the following findings were obtained. That is, it was found that the coating film formed by coating or coating on the inner surface of the container had a very small film thickness of several μm, and in such a case, the coating film was easily broken at the anode-degraded portion. It was found that the magnitude of the resistance of the coating film in the deteriorated part of the anode was 1/100 or less as compared with the resistance of the deteriorated part in the cathode. In the case of a thin coated steel sheet with a thickness of several μm, which is used for the inner surface of the container, in terms of area, the anode deterioration part, which can be ignored compared to the cathode, has a great effect on the result when corrosion resistance is evaluated using AC. To exert.

【0011】つまり、容器内面に用いるような膜厚数μ
m の薄い塗装鋼板の耐食性評価は、従来いわれてきたよ
うなアノードとカソードが混在する系にそのまま交流に
よる耐食性評価法を用いることは無理であることがわか
った。
That is, the film thickness of several μ as used on the inner surface of the container
It has been found that it is not possible to use the corrosion resistance evaluation method by alternating current for the conventional evaluation of the corrosion resistance of thin coated steel sheet with mixed m and the system.

【0012】そこで、試験材を分極して、アノード反応
またはカソード反応の単一の反応だけが、試験材表面で
起こるような状態にしておき、そして、交流を印加して
位相のずれを測定し、塗膜劣化部の抵抗と健全な塗膜部
分の容量であらわされる時定数の示す周波数に対応する
位相のずれが45°となる周波数を利用すれば精度良く耐
食性評価を行なえる。ちなみに周波数が高くなることは
劣化の程度が大きいことを示す。
Therefore, the test material is polarized so that only a single reaction, an anodic reaction or a cathodic reaction, occurs on the surface of the test material, and an alternating current is applied to measure the phase shift. , Corrosion resistance can be evaluated accurately by using the frequency at which the phase shift corresponding to the frequency indicated by the time constant expressed by the resistance of the coating film deteriorated portion and the capacity of the healthy coating film portion is 45 °. By the way, the higher the frequency, the greater the degree of deterioration.

【0013】この発明は、上述の知見に基づいてなされ
たものである。この発明は、缶用材料として使用される
有機被覆が施こされた鋼板または缶体の試験材を試験溶
液中に作用極として配置し、更に、前記試験溶液中に対
極を配置し、次いで、アノードに分極した状態またはカ
ソードに分極した状態で、前記試験材と前記対極との間
に、振幅が2mVから20mVの範囲内、周波数が0.1 MHz か
ら1MHz の範囲内の交流電圧を印加し、その時、前記対
極で測定される電流の入力した交流に対する位相のずれ
が45°となる周波数のうちで最も高い周波数の大きさを
求め、求めた周波数の値によって前記試験材の劣化の程
度を判断することに特徴を有するものである。
The present invention was made based on the above findings. This invention, a test material of a steel plate or a can body coated with an organic coating used as a material for a can is arranged as a working electrode in a test solution, and further, a counter electrode is arranged in the test solution, and then, With the anode polarized or the cathode polarized, an AC voltage with an amplitude within the range of 2 mV to 20 mV and a frequency within the range of 0.1 MHz to 1 MHz is applied between the test material and the counter electrode. , The magnitude of the highest frequency among the frequencies at which the phase difference with respect to the input alternating current of the current measured at the counter electrode is 45 ° is determined, and the degree of deterioration of the test material is determined by the value of the determined frequency. It has a special feature.

【0014】[0014]

【作用】本発明においては、容器等の用途に用いる、内
面塗装等によって有機被覆が施こされた、鋼板または缶
体の試験材を、試験溶液中でアノードに分極した状態、
またはカソードに分極した状態で、交流を用いて評価す
ることにより、再現性の良い評価が可能である。この際
の、分極の程度は、ガス発生領域に達しない程度の分極
とする。望ましくは、アノード反応またはカソード反応
のうちのいずれか一方の反応だけが、試験材表面でおこ
るようになる必要最小限の分極にとどめるのがよい。
In the present invention, a test material for a steel plate or a can body, which is used for a container or the like and has an organic coating applied by an inner surface coating, is polarized in the test solution into an anode,
Alternatively, the evaluation with good reproducibility can be performed by evaluating with an alternating current in a state where the cathode is polarized. At this time, the degree of polarization is such that it does not reach the gas generation region. Desirably, only one of the anodic and cathodic reactions should be kept to the minimum required polarization to occur at the test material surface.

【0015】試験材に印加する交流の振幅は、2mV以上
20mV以下とすべきである。20mVを超えると塗膜の破壊
等、系に与える影響が大きくなる。また、振幅2mV未満
では、参照電極による電位変化の測定誤差が大きくな
る。容器内面に用いる塗装または被覆を対象とする場
合、望ましくは振幅5mVから12mVの範囲内とするのがよ
い。
The amplitude of the alternating current applied to the test material is 2 mV or more
Should be below 20 mV. When it exceeds 20 mV, the influence on the system such as the damage of the coating film becomes large. If the amplitude is less than 2 mV, the measurement error of the potential change due to the reference electrode becomes large. When the coating or coating used on the inner surface of the container is targeted, the amplitude is preferably within the range of 5 mV to 12 mV.

【0016】試験材に印加する交流の周波数は、容器内
面に用いる塗装または被覆の特性から、0.1MHzから1MH
z の範囲内とすべきである。この範囲から外れて測定を
行っても、有意義な結果は得られないばかりでなく、時
間の無駄である。
The frequency of the alternating current applied to the test material is 0.1 MHz to 1 MH depending on the characteristics of the coating or coating used on the inner surface of the container.
Should be in the range of z. Not only will meaningful results not be obtained if measurements are made outside this range, it is a waste of time.

【0017】評価法としては、交流電圧を試験材、例え
ば塗装鋼板に印加し、その時の試験溶液と接した塗装面
近傍で観察される位相データを利用し、入力した交流に
対する位相のずれが45°となる周波数のうち、最も高い
周波数の大きさ (以下、「f B :Hz」という) で、塗装
鋼板の劣化の程度を判断する評価法を用いる。周波数
(f B :Hz)が高くなることは劣化の程度が大きいこと
を示す。
As an evaluation method, an AC voltage is applied to a test material, for example, a coated steel plate, and phase data observed in the vicinity of the coated surface in contact with the test solution at that time is used. An evaluation method is used to judge the degree of deterioration of the coated steel sheet by the highest frequency magnitude (hereinafter referred to as “f B : Hz”) among the frequencies that become °. A higher frequency (f B : Hz) indicates a greater degree of deterioration.

【0018】入力した交流に対する位相のずれが45°と
なる周波数を用いるのは、下記の理由による。即ち、交
流インピーダンス法では、交流を系に流すので、各周波
数に対して、インピーダンス(抵抗)と位相に関する2
つのデータが同時に得られる。図7はインピーダンス抵
抗と周波数との関係および位相のずれと周波数との関係
の1例を示すグラフである。図7に示す2つのデータで
1組のデータとなる。塗装の状態は、折れ点の示す周波
数の大きさで判断する。しかし、抵抗のデータから周波
数を読み取ることは難しい。折れ点は位相のデータで
は、ずれが45°になる点として示される。別の説明で
は、折れ点は、系の中のコンデンサー成分と抵抗成分の
つり合う点である。コンデンサー成分のみでは位相のず
れは90°となり、抵抗成分のみではそのずれは0°であ
る。位相のずれが45°は、系の抵抗成分とコンデンサー
成分のつり合う点である。
The frequency at which the phase shift with respect to the input AC is 45 ° is used for the following reason. That is, in the AC impedance method, since an AC current is passed through the system, the impedance (resistance) and the phase 2 for each frequency.
Two data are obtained at the same time. FIG. 7 is a graph showing an example of the relationship between impedance resistance and frequency and the relationship between phase shift and frequency. The two data shown in FIG. 7 form one set of data. The state of coating is judged by the magnitude of the frequency indicated by the break point. However, it is difficult to read the frequency from the resistance data. The break point is shown in the phase data as a point where the shift is 45 °. In another description, the break point is the point where the capacitor and resistance components in the system are balanced. The phase shift is 90 ° only with the capacitor component, and the shift is 0 ° with only the resistance component. The phase shift of 45 ° is the point where the resistance component and the capacitor component of the system are balanced.

【0019】他の評価法、例えば、総インピーダンスで
評価する方法では、測定感度が低く、複数の試験材の耐
食性の比較や、短時間評価には不向きである。
Other evaluation methods, such as the method of evaluating the total impedance, have low measurement sensitivity and are not suitable for comparison of corrosion resistance of a plurality of test materials and short-time evaluation.

【0020】更に、位相データでなく、インピーダンス
データで評価する方法では、コンピューターでデータを
処理する場合、データの判読が難しいという欠点があ
る。
Further, the method of evaluating the impedance data instead of the phase data has a drawback that the data is difficult to read when the data is processed by a computer.

【0021】試験溶液としては、実際に容器として使用
される場合に充填される内容物に準じたものを用いる。
As the test solution, a solution according to the contents to be filled when it is actually used as a container is used.

【0022】[0022]

【実施例】次に、この発明を実施例により、図面を参照
しながら説明する。図1は実施例に使用した試験装置を
示すブロック図である。図1において、1はポテンシオ
スタット、2は対極、3は参照電極、4は作用極(試験
材)、5はセル、6は周波数解析装置(FRA 、FET)、7
はGPIBケーブル、8はコンピューター、そして、9はプ
ロッターである。図2および図3は測定セルを示す説明
図である。図2は、平板形状の試験材を対象にしたも
の、図3は、缶体形状の試験材を対象にしたものをそれ
ぞれ示す。図2において、2は対極、3は参照電極、4
は作用極(試験材)、5はガラスセル、10は循環水出入
口、11はガス出入口、12は試験溶液出入口、13はシリコ
ンラバー、14は試験溶液(電解液)、そして、15は塗装
面である。図3において、2は対極、3は参照電極、4
は作用極(試験材)、14は試験溶液(電解液)、そし
て、16は上下可変スタンドである。参照電極3として、
Ag/AgCl、S.C.E (飽和カロメロ電極)等が使用でき、
特に制限はない。対極2としても、試験材4の1/10より
も大きな面積のものであれば、Pt、カーボン等が使用で
き、特に制限はない。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described by way of embodiments with reference to the drawings. FIG. 1 is a block diagram showing the test apparatus used in the examples. In FIG. 1, 1 is a potentiostat, 2 is a counter electrode, 3 is a reference electrode, 4 is a working electrode (test material), 5 is a cell, 6 is a frequency analyzer (FRA, FET), 7
Is a GPIB cable, 8 is a computer, and 9 is a plotter. 2 and 3 are explanatory views showing the measuring cell. FIG. 2 shows a test material having a flat plate shape, and FIG. 3 shows a test material having a can body shape. In FIG. 2, 2 is a counter electrode, 3 is a reference electrode, 4
Is a working electrode (test material), 5 is a glass cell, 10 is a circulating water inlet / outlet, 11 is a gas inlet / outlet, 12 is a test solution inlet / outlet, 13 is a silicone rubber, 14 is a test solution (electrolyte), and 15 is a painted surface. Is. In FIG. 3, 2 is a counter electrode, 3 is a reference electrode, 4
Is a working electrode (test material), 14 is a test solution (electrolyte), and 16 is a vertically adjustable stand. As the reference electrode 3,
Ag / AgCl, SCE (saturated calomel electrode), etc. can be used,
There is no particular limitation. As the counter electrode 2, Pt, carbon or the like can be used as long as it has an area larger than 1/10 of the test material 4, and there is no particular limitation.

【0023】ポテンシオスタット1から印加された交流
による電圧変動を参照電極3(Ag/AgCl)を通じて測定
し、カソードに分極した状態で、得られたインピーダン
スおよび位相データをコンピューター8に取り込み処理
し、本発明範囲内の方法によりデータ処理を行ない、入
力した交流に対する対極2で測定される電流の位相のず
れが45°となる周波数のうち、最も高い周波数の大きさ
(f B :Hz)を求めた。その結果を図5および図6に示
す。試験溶液として、1.5 wt.%食塩+1.5 wt.%クエン
酸:70℃を用い、電位はAg/ AgCl参照電極を基準とし
た。比較のため本発明範囲外の方法によってもデータ処
理を行ない周波数(f B :Hz)を求め、比較例とした。
その結果を図4に示す。表1に実施例および比較例に用
いた試験材の一覧を示す。
The voltage fluctuation due to the alternating current applied from the potentiostat 1 was measured through the reference electrode 3 (Ag / AgCl), and the obtained impedance and phase data were taken into the computer 8 in the state of being polarized to the cathode and processed. Data processing is performed by a method within the scope of the present invention, and the highest frequency magnitude (f B : Hz) is obtained among the frequencies at which the phase difference of the current measured at the counter electrode 2 with respect to the input alternating current is 45 °. It was The results are shown in FIGS. 5 and 6. As the test solution, 1.5 wt.% Sodium chloride + 1.5 wt.% Citric acid: 70 ° C. was used, and the potential was based on the Ag / AgCl reference electrode. For comparison, data processing was performed by a method outside the scope of the present invention to obtain the frequency (f B : Hz), which was used as a comparative example.
The result is shown in FIG. Table 1 shows a list of test materials used in Examples and Comparative Examples.

【0024】[0024]

【表1】 [Table 1]

【0025】図4は比較例を示し、カソード{−0.8V v
s Ag/AgCl (Ag/AgCl 参照電極の平行反応の電位を基準
として試験材を−0.8Vのところに保持)}に分極したも
のの、印加した交流電圧の振幅が30mVあるいは1mVの場
合、または、印加した交流電圧の振幅は本発明範囲内の
10mVであるが分極を行わなかった場合の、試験材の周波
数 (f B :Hz) の経時を示す。図5は実施例を示し、印
加した交流電圧の振幅を10mVとし、試験材をカソード
(−0.8V vs Ag/AgCl 、−1.0V vs Ag/AgCl あるいは−
1.2V vs Ag/AgCl )に分極した状態での、試験材の周波
数 (f B :Hz) の経時を示す。図6は実施例を示し、印
加した交流電圧の振幅を10mVとし、試験材をカソード
(−0.8V vs Ag/AgCl )に分極した状態での、各種試験
材の周波数 (fB :Hz) の経時を示す。図4、図5およ
び図6において、横軸は、浸漬時間 (hr) の対数、縦軸
は、周波数 (f B :Hz) の対数を示す。
FIG. 4 shows a comparative example, in which the cathode {−0.8V v
s Ag / AgCl (holding the test material at -0.8 V with reference to the parallel reaction potential of the Ag / AgCl reference electrode)}, but when the applied AC voltage amplitude is 30 mV or 1 mV, or The amplitude of the applied AC voltage is within the range of the present invention.
It shows the frequency (f B : Hz) of the test material over time when polarization was not performed although it was 10 mV. FIG. 5 shows an example in which the amplitude of the applied AC voltage is 10 mV and the test material is a cathode (−0.8V vs Ag / AgCl, −1.0V vs Ag / AgCl or −
It shows the frequency (f B : Hz) of the test material over time when it is polarized to 1.2V vs Ag / AgCl). FIG. 6 shows an example of the frequency (f B : Hz) of various test materials when the amplitude of the applied AC voltage was 10 mV and the test material was polarized to the cathode (−0.8V vs Ag / AgCl). Indicates the passage of time. 4, 5, and 6, the horizontal axis represents the logarithm of the immersion time (hr) and the vertical axis represents the logarithm of the frequency (f B : Hz).

【0026】図4より、印加した交流電圧の周波数が2
mV未満または20mVを超えると、周波数 (f B :Hz) は、
不安定になり、浸漬時間とともに劣化の進行する様子
が、明確に評価できないことがわかる。また、図4よ
り、分極を行なわず、アノードとカソードとが混在した
状態で評価を行なうと、やはり良好なデータが得られず
浸漬時間とともに劣化の進行する様子が、明確に評価で
きないことがわかる。
From FIG. 4, the frequency of the applied AC voltage is 2
Below mV or above 20 mV, the frequency (f B : Hz) becomes
It can be seen that the state of instability and deterioration progressing with immersion time cannot be clearly evaluated. Further, from FIG. 4, it can be seen that when the evaluation is performed in a state where the anode and the cathode are mixed without polarization, good data cannot be obtained and the deterioration progresses with the immersion time cannot be clearly evaluated. ..

【0027】図5中に示す、、より、分極を行な
った状態で、交流を用いて測定すると、浸漬時間ととも
に劣化の進行する様子が、明確に評価できることがわか
る。、より、本発明範囲内による評価法は、目視に
比較して非常に感度が高いことが示され、従来の官能試
験に比較して本発明評価法が高感度であり、短時間の評
価が可能であることがわかる。また、に示されるよう
に、過度の分極は不適切であることがわかる。
As shown in FIG. 5, it can be seen that the state of deterioration progressing with immersion time can be clearly evaluated when measured with an alternating current in a polarized state. From the above, the evaluation method within the scope of the present invention shows that the sensitivity is very high as compared with the visual observation, and the evaluation method of the present invention is highly sensitive as compared with the conventional sensory test, and evaluation in a short time is performed. It turns out that it is possible. Also, as shown in, it can be seen that excessive polarization is inappropriate.

【0028】図6より、本発明範囲内の評価法を用いる
と、種々の異なる材料についても、その耐食性の差を定
量的に評価できることがわかる。
It can be seen from FIG. 6 that the difference in corrosion resistance can be quantitatively evaluated for various different materials by using the evaluation method within the scope of the present invention.

【0029】[0029]

【発明の効果】以上説明したように、この発明によれ
ば、容器内面に用いる塗装鋼板において、従来の官能試
験等に比較して、再現性よく、高い感度で、短時間で、
定量的に耐食性評価を行うことができ、かくして、工業
上有用な効果が得られる。
As described above, according to the present invention, in the coated steel sheet used for the inner surface of the container, as compared with the conventional sensory test, the reproducibility is high, the sensitivity is high, and the time is short.
The corrosion resistance can be quantitatively evaluated, and thus the industrially useful effect can be obtained.

【図面の簡単な説明】[Brief description of drawings]

【図1】実施例に使用した試験装置を示すブロック図FIG. 1 is a block diagram showing a test apparatus used in Examples.

【図2】平板形状の試験材を対象にした測定セルの1例
を示す説明図
FIG. 2 is an explanatory view showing an example of a measuring cell for a flat plate-shaped test material.

【図3】缶体形状の試験材を対象にした測定セルの1例
を示す説明図
FIG. 3 is an explanatory view showing an example of a measuring cell for a can-shaped test material.

【図4】交流電圧の振幅がこの発明範囲外、または、分
極を行わないときの、試験材の周波数 (f B :Hz) の経
時を示すグラフ
FIG. 4 is a graph showing the frequency (f B : Hz) of the test material over time when the amplitude of the AC voltage is outside the range of the present invention or when polarization is not performed.

【図5】この発明の方法による、試験材の周波数 (f
B :Hz) の経時を示すグラフ
FIG. 5 shows the frequency (f
(B : Hz) graph showing changes over time

【図6】この発明の方法による、各種試験材の周波数
(f B :Hz) の経時を示すグラフ
FIG. 6 shows frequencies of various test materials according to the method of the present invention.
Graph showing (f B : Hz) over time

【図7】インピーダンス抵抗と周波数との関係および位
相のずれと周波数との関係の1例を示すグラフ。
FIG. 7 is a graph showing an example of a relationship between impedance resistance and frequency and a relationship between phase shift and frequency.

【符号の説明】[Explanation of symbols]

1 ポテンシオスタット 2 対極 3 参照電極 4 作用極(試験材) 5 セル(ガラスセル) 6 周波数解析装置(FRA 、FET) 7 GPIBケーブル 8 コンピューター 9 プロッター 10 循環水出入口 11 ガス出入口 12 試験溶液出入口 13 シリコンラバー 14 試験溶液(電解液) 15 塗装面 16 上下可変スタンド。 1 potentiostat 2 counter electrode 3 reference electrode 4 working electrode (test material) 5 cell (glass cell) 6 frequency analyzer (FRA, FET) 7 GPIB cable 8 computer 9 plotter 10 circulating water inlet / outlet 11 gas inlet / outlet 12 test solution inlet / outlet 13 Silicon rubber 14 Test solution (electrolyte) 15 Painted surface 16 Vertically adjustable stand.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 缶用材料として使用される有機被覆が施
こされた鋼板または缶体の試験材を試験溶液中に作用極
として配置し、更に、前記試験溶液中に対極を配置し、
次いで、アノードに分極した状態またはカソードに分極
した状態で、前記試験材と前記対極との間に、振幅が2
mVから20mVの範囲内、周波数が0.1MHz から1MHz の範
囲内の交流電圧を印加し、その時、前記対極で測定され
る電流の入力した交流に対する位相のずれが45°となる
周波数のうちで最も高い周波数の大きさを求め、求めた
周波数の値によって前記試験材の劣化の程度を判断する
ことを特徴とする缶用材料の耐食性評価法。
1. A test material for a steel plate or can body coated with an organic coating, which is used as a material for a can, is arranged in a test solution as a working electrode, and a counter electrode is arranged in the test solution.
Then, with the anode polarized or the cathode polarized, an amplitude of 2 is applied between the test material and the counter electrode.
Applying AC voltage in the range of mV to 20 mV and frequency of 0.1MHz to 1MHz, at that time, it is the most of the frequency where the phase difference of the current measured at the counter electrode with respect to the input AC is 45 °. A method for evaluating corrosion resistance of a can material, which comprises determining the magnitude of a high frequency and determining the degree of deterioration of the test material according to the value of the determined frequency.
JP10602792A 1992-03-30 1992-03-30 Evaluation method for corrosion resistance of can materials Expired - Fee Related JP3173523B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10602792A JP3173523B2 (en) 1992-03-30 1992-03-30 Evaluation method for corrosion resistance of can materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10602792A JP3173523B2 (en) 1992-03-30 1992-03-30 Evaluation method for corrosion resistance of can materials

Publications (2)

Publication Number Publication Date
JPH05281179A true JPH05281179A (en) 1993-10-29
JP3173523B2 JP3173523B2 (en) 2001-06-04

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Country Status (1)

Country Link
JP (1) JP3173523B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997047961A1 (en) * 1996-06-10 1997-12-18 Honda Giken Kogyo Kabushiki Kaisha Method of testing corrosion resistance of object comprising metal material and coating film, and electrolysis tester
CN103063565A (en) * 2012-12-31 2013-04-24 奥瑞金包装股份有限公司 Electrolytic cell for detecting corrosion resistance of packaging material
JP2016050915A (en) * 2014-09-02 2016-04-11 国立大学法人広島大学 Corrosion resistance evaluation method and corrosion resistance evaluation device for pre-painted metal material

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102050330B1 (en) 2017-12-26 2019-12-02 한국산업기술대학교산학협력단 Plant Factory System using the Sunlight
KR102112341B1 (en) * 2018-09-19 2020-05-18 백영일 solar power gensration apparatus for growing plant

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997047961A1 (en) * 1996-06-10 1997-12-18 Honda Giken Kogyo Kabushiki Kaisha Method of testing corrosion resistance of object comprising metal material and coating film, and electrolysis tester
US6033554A (en) * 1996-06-10 2000-03-07 Honda Giken Kogyo Kabushiki Kaisha Corrosion resistance test process for test material comprised of metal blank and coating film
CN103063565A (en) * 2012-12-31 2013-04-24 奥瑞金包装股份有限公司 Electrolytic cell for detecting corrosion resistance of packaging material
JP2016050915A (en) * 2014-09-02 2016-04-11 国立大学法人広島大学 Corrosion resistance evaluation method and corrosion resistance evaluation device for pre-painted metal material

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