JPH05232072A - Method and device for evaluating anticorrosion of plating - Google Patents
Method and device for evaluating anticorrosion of platingInfo
- Publication number
- JPH05232072A JPH05232072A JP7323192A JP7323192A JPH05232072A JP H05232072 A JPH05232072 A JP H05232072A JP 7323192 A JP7323192 A JP 7323192A JP 7323192 A JP7323192 A JP 7323192A JP H05232072 A JPH05232072 A JP H05232072A
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- Prior art keywords
- base material
- plating
- corrosion resistance
- potential
- test
- Prior art date
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、建設機械用のシリンダ
ロッドや自動車用アブソーバ等のめっき部品の耐食性を
必要とする製品のめっきの耐食性を評価するための方法
及びその装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for evaluating the corrosion resistance of plated products such as cylinder rods for construction machines and absorbers for automobiles, which require corrosion resistance.
【０００２】[0002]
【従来の技術】めっき処理した製品の耐食性評価方法の
一般的なものとして、ＪＩＳ規格にもあるように、主に
塩水噴霧試験、ＣＡＳＳ試験、コロードコート試験及び
屋外暴露試験がある。上記塩水噴霧試験は、相対湿度９
０％、試験温度３０〜４０℃において、塩水（５％濃
度）を噴霧し、２４時間を１サイクルとして３〜４サイ
クル実施するものである。ＣＡＳＳ試験は、塩水５％溶
液に塩化第２銅を混合したものを噴霧する試験方法であ
り、基本的には塩水噴霧試験と同様である。コロードコ
ート試験は、腐食ペースト（成分：硫酸銅、塩化第２
鉄、塩化アンモニュム、水、カオリン）を試験片に湿布
し、恒温恒湿状態で２０時間を１サイクルとした腐食試
験である。これらの試験方法は、いずれも一定時間試験
を実施した後、試験面に生じた腐食率で耐食性を評価し
ている。2. Description of the Related Art As a general method for evaluating the corrosion resistance of plated products, there are mainly salt spray test, CASS test, corrode coat test and outdoor exposure test as in JIS standard. Relative humidity 9
Salt water (5% concentration) is sprayed at 0% and a test temperature of 30 to 40 ° C., and 3 to 4 cycles are performed with 24 hours as one cycle. The CASS test is a test method of spraying a mixture of cupric chloride in a 5% salt water solution, and is basically the same as the salt spray test. Corrode coat test is performed using corrosion paste (component: copper sulfate, second chloride
Iron, ammonium chloride, water, kaolin) was applied to the test piece with a compress and the corrosion test was carried out in a constant temperature and constant humidity condition for 20 hours as one cycle. In all of these test methods, after carrying out a test for a certain period of time, the corrosion resistance is evaluated by the corrosion rate generated on the test surface.
【０００３】[0003]
【発明が解決しようとする課題】従来の評価方法、特に
一般に使用されている塩水噴霧試験及び、ＣＡＳＳ試験
では、試験時間が２４時間のサイクルを３〜４回繰返す
ことで、最長で９６時間かかり、これが非常に長いた
め、結果が判明するまで時間がかかる。また、その耐食
性は発錆の有無及び、割合から評価するものであり、破
壊検査に等しく製品が無駄になってしまうという問題が
あった。また、試験に際しての供試品は、定期的な抜取
り検査であるため、ロッド間のバラツキがどの程度ある
か把握することが困難であった。さらに、試験装置のス
ペースが限られているため、大型の供試品を試験する場
合は切断しなければならずやっかいであった。In the conventional evaluation methods, particularly the commonly used salt spray test and CASS test, a cycle of a test time of 24 hours is repeated 3 to 4 times, so that a maximum of 96 hours is required. , This is so long that it will take some time for results to be known. Further, the corrosion resistance is evaluated by the presence or absence of rust and the ratio thereof, and there is a problem that the product is wasted as in the destructive inspection. In addition, since the sample used for the test is a periodical sampling inspection, it is difficult to grasp how much the rods vary. Further, since the space of the test apparatus is limited, it is troublesome to cut a large-sized sample to be tested.
【０００４】本発明は上記のことにかんがみなされたも
ので、非破壊試験で、かつ短時間に部品レベル及び、製
品レベル（または現場）の主要部位の耐食性がわかり、
さらに、出荷段階で、全数試験を実施することにより、
製品の品質保証ができ、発錆不具合にかかわるクレーム
を低減できるようにしためっきの耐食性評価方法及びそ
の装置を提供することを目的とするものである。The present invention has been made in view of the above points, and in a non-destructive test, the corrosion resistance of the main parts at the component level and the product level (or on-site) can be found in a short time.
Furthermore, by conducting a 100% test at the shipping stage,
It is an object of the present invention to provide a corrosion resistance evaluation method for plating and an apparatus therefor capable of guaranteeing product quality and reducing complaints regarding rusting defects.
【０００５】[0005]
【課題を解決するための手段】めっき（２層及び、３
層）の耐食性は、めっき表面から母材へ貫通するマイク
ロクラックの割合が多い程、まためっき析出時に生じる
ピンホールの割合が多い程耐食性が低下することが知ら
れている。耐食性を向上させるには、めっき条件及び、
めっき後の加工方法（研磨方法）によって、それらを皆
無にすることが望ましい。しかしながら、このマイクロ
クラックやピンホールをなくすことは非常に困難であ
る。[Means for Solving the Problems] Plating (2 layers and 3 layers
It is known that the corrosion resistance of a layer decreases as the proportion of microcracks penetrating from the plating surface to the base material increases and the proportion of pinholes generated during plating deposition increases. To improve corrosion resistance, plating conditions and
It is desirable to eliminate them by a processing method (polishing method) after plating. However, it is very difficult to eliminate these microcracks and pinholes.
【０００６】一般に、図１１に示すように、電解溶液ａ
中に金属ｂが浸漬されている場合、その界面には必ず電
位△Ｖが生じる。この電位△Ｖの値は物質ごとに違うも
のであり、金属特有のものである。一般にめっき材料と
して、耐食性を向上させるには、より貴な物質が選ば
れ、母材とは異質の物質がめっき処理される。In general, as shown in FIG. 11, an electrolytic solution a
When the metal b is immersed therein, the potential ΔV is always generated at the interface. The value of this electric potential ΔV is different for each substance and is peculiar to metal. Generally, as a plating material, a more noble substance is selected to improve the corrosion resistance, and a substance different from the base material is plated.
【０００７】本発明は上記のことに着目してなされたも
ので、上記目的を達成するためのめっきの耐食性評価方
法は、通電性を有する母材にめっきを施した被試験片と
基準電極とを電解溶液中に浸漬し、この両部材間の電位
差の経時変化から上記被試験片の耐食性を評価するよう
にする。そしてその装置は、通電性を有する母材にめっ
きを施した被試験片にて開口部が液密に閉じられ、かつ
内部に電解溶液と基準電極を内装した絶縁性を有する容
器と、上記基準電極と被試験片の母材間の電位を測定す
る電位検出手段とからなっている。めっき材料は、母材
質と異なる物質で乾式及び湿式めっき、または蒸着、コ
ーティング、塗料からなるものである。電解溶液を構成
する電解質として、少なくとも塩化ナトリウムを含み、
その濃度は、０．０１〜４０％である。また、基準電極
の材質として、白金、金、銀等の箔状、棒状からなって
いる。さらに電位検出手段は、電位計もしくはレコーダ
であり、測定電位の出力インピーダンスが１ｃｍ2 あた
り１Ω〜１ＫΩからなっている。The present invention has been made by paying attention to the above, and a method for evaluating corrosion resistance of plating for achieving the above object is to provide a test piece and a reference electrode, which are plated on a base material having electrical conductivity. Is immersed in an electrolytic solution, and the corrosion resistance of the test piece is evaluated from the change over time in the potential difference between the two members. And the apparatus, the opening is liquid-tightly closed by the test piece plated on the base material having electrical conductivity, and an insulating container having an electrolytic solution and a reference electrode inside, and the above-mentioned reference It is composed of an electrode and a potential detecting means for measuring the potential between the base material of the test piece. The plating material is a substance different from the base material and includes dry and wet plating, vapor deposition, coating, and paint. As an electrolyte constituting the electrolytic solution, at least containing sodium chloride,
Its concentration is 0.01-40%. The reference electrode is made of foil such as platinum, gold, silver, or rod. Further, the potential detecting means is an electrometer or a recorder, and the output impedance of the measured potential is 1Ω to 1KΩ per cm 2 .
【０００８】[0008]
【作 用】基準電極と母材間の電圧は、基準電極とめ
っき層間の電位か、またはめっき層にマイクロクラック
が存在し、これが母材に貫通していれば基準電極と母材
間のその物質特有の相対電位が測定できる。[Operation] The voltage between the reference electrode and the base material is the potential between the reference electrode and the plating layer, or if there is a microcrack in the plating layer and this penetrates the base material, the voltage between the reference electrode and the base material The relative electric potential peculiar to a substance can be measured.
【０００９】[0009]
【実 施 例】本発明の実施例を図１から図１０に基づ
いて説明する。図１は本発明の原理を示すもので、塩水
３％濃度の電解溶液１に白金にて構成された基準電極２
との局部電池を構成してその相対電位を電位計３にて測
定することにより、めっき層４の電位か、またはメッキ
層４のマイクロクラックを貫通した母材５の電位かが判
断できる。これにより母材５へ貫通しているか否かが分
かり、短時間でしかも非破壊検査により実施でき、部品
及び、製品の耐食性を評価することが可能になる。EXAMPLE An example of the present invention will be described with reference to FIGS. FIG. 1 shows the principle of the present invention. A reference electrode 2 made of platinum in an electrolytic solution 1 having a salt water concentration of 3%.
It is possible to determine whether the potential of the plating layer 4 or the potential of the base material 5 that has penetrated the microcracks of the plating layer 4 by configuring the local battery and the relative potential of the local battery with the electrometer 3. This makes it possible to know whether or not the base material 5 has been penetrated, and it can be carried out in a short time and by non-destructive inspection, and it becomes possible to evaluate the corrosion resistance of parts and products.
【００１０】図２，図３は上記基本原理に基づいて、ク
ロムめっきを施した被試験片６（シリンダロッド）の耐
食性を評価する装置の一例を示すものであり、被試験片
６にて開口部が閉じられるようにしてこの被試験片６に
絶縁性を有する容器７をあってがい、その中に濃度３％
の食塩水８を満たす。またこの容器７には電位測定用の
基準電極（白金）２を固定している。そして被試験片６
のリード端子９は、クロムめっきが施されている被試験
片６の母材（Ｆｅ）６ａにスポット溶接にて固定する。
基準電極２及び被試験片６からのリード線は抵抗１０を
並列に結線し、ペン書きレコーダ１１に結線し測定す
る。上記抵抗１０は局部電池を形成する際の電流調節を
するためのものであり、被試験片６の種類等に応じて変
えることができるようになっている。2 and 3 show an example of an apparatus for evaluating the corrosion resistance of a chromium-plated test piece 6 (cylinder rod) based on the above-mentioned basic principle. The test piece 6 was placed in such a manner that the test piece 6 was closed, and the container 7 having an insulating property was put on the test piece 6 and the concentration of
8 of saline solution. Further, a reference electrode (platinum) 2 for measuring potential is fixed to the container 7. And the test piece 6
The lead terminal 9 is fixed by spot welding to the base material (Fe) 6a of the test piece 6 that is plated with chromium.
A lead wire from the reference electrode 2 and the test piece 6 is connected to a resistor 10 in parallel and connected to a pen writing recorder 11 for measurement. The resistor 10 is for adjusting the current when forming a local battery, and can be changed according to the type of the test piece 6 and the like.
【００１１】上記基準電極２と被試験片６間の電圧は、
基準電極２とクロムめっき層１２間の電位か、またはク
ロームめっき層１２にマイクロクラックが存在し、それ
が母材６ａへ貫通していれば、基準電極２と母材６ａ間
の、その物質特有の相対電位が測定できる。The voltage between the reference electrode 2 and the test piece 6 is
If there is a potential between the reference electrode 2 and the chrome plating layer 12 or if there is a microcrack in the chrome plating layer 12 and it penetrates into the base material 6a, it is peculiar to the substance between the reference electrode 2 and the base material 6a. The relative potential of can be measured.
【００１２】実施例１ 図２，図３に示す方法により被試験片６が、クロム単体
の場合、及び、Ｆｅの場合についてそれぞれの電位差を
測定した。その結果を表１に示す。Example 1 According to the method shown in FIGS. 2 and 3, the potential difference between each of the test pieces 6 made of chromium alone and Fe was measured. The results are shown in Table 1.
【００１３】[0013]
【表１】 [Table 1]
【００１４】クロムは、２０ｍｖ、Ｆｅについては２０
０ｍｖであり、その測定電位より物質を判断することは
可能である。Chromium is 20 mv, Fe is 20
It is 0 mv, and it is possible to judge the substance from the measured potential.
【００１５】図４にシリンダロッドにおけるクロムめっ
き層の１個の正常品Ａと３個の不具合品Ｂ1 ，Ｂ2 ，Ｂ
3 における経時的電位差の推移を示す。この図で明らか
なように、各被試験片の電位測定では正常品Ａは経時的
には減少し、不具合Ｂ1 ，Ｂ2 ，Ｂ3 のそれぞれの電位
は急激に上昇し、これにより、クロムめっき層に存在す
るマイクロクラックが母材６ａに貫通しているか否かを
経時的電位差の推移を調べることにより容易に判断する
ことができる。FIG. 4 shows one normal product A of the chromium plating layer of the cylinder rod and three defective products B 1 , B 2 , B.
The change in potential difference over time in 3 is shown. As is apparent from this figure, in the measurement of the potential of each test piece, the normal product A decreases with time, and the potentials of the defects B 1 , B 2 , and B 3 rise sharply. Whether or not the microcracks existing in the plating layer penetrate the base material 6a can be easily determined by examining the transition of the potential difference over time.
【００１６】実施例２ 本発明における評価方法が耐食性試験結果とどの程度相
関があるかを調べた。すなわち、上記測定電位は、電気
化学的反応に基づくものであり、これをＦｅ2+イオン反
応の有無で確認した。このときの試薬は、フェリシアン
化カリウムを使用しＦｅ2+イオンが存在すればその部位
が青色を呈することを利用した。それを食塩３％溶液に
混ぜ、食塩１３％溶液が入った容器７に数ミリリットル
滴下し、数分程度放置した。これによる上記実施例１に
用いた被試験片Ａ，Ｂ1 ，Ｂ2 ，Ｂ3 のそれぞれの耐食
試験前におけるＦｅ2+イオン反応部位と反応点数を調べ
た結果図５の（ａ），（ｂ），（ｃ），（ｄ）に示すよ
うになった。すなわち、正常品Ａは図５（ａ）に示すよ
うにＦｅ2+イオンの反応はなかった。また不具合品
Ｂ1 ，Ｂ2 ，Ｂ3 はそれぞれ図５（ｂ），（ｃ），
（ｄ）に示されるような反応点数があった。Example 2 The correlation between the evaluation method of the present invention and the corrosion resistance test results was examined. That is, the measured potential was based on an electrochemical reaction, which was confirmed by the presence or absence of Fe 2+ ion reaction. As the reagent at this time, potassium ferricyanide was used, and it was utilized that if Fe 2+ ions were present, that site exhibited a blue color. It was mixed with a 3% sodium chloride solution, a few milliliters of the solution was dropped into a container 7 containing a 13% sodium chloride solution, and the mixture was left for several minutes. As a result of examining the Fe 2+ ion reaction site and the number of reaction points before the corrosion resistance test of each of the test pieces A, B 1 , B 2 , and B 3 used in the above Example 1 by this, (a) of FIG. As shown in b), (c), and (d). That is, the normal product A did not react with Fe 2+ ions as shown in FIG. The defective products B 1 , B 2 and B 3 are shown in FIGS.
There were reaction scores as shown in (d).
【００１７】次にこれと同一の試験片を耐食性試験にか
けた。この耐食性試験の条件は、温度８０℃、相対湿度
９０％、試験時間１００時間であり、この試験の実施後
の発錆部位と発錆点数を調べた結果は図６（ａ），
（ｂ），（ｃ），（ｄ）に示すようになった。図５と図
６の各図はそれぞれ対応するもので、正常品Ａは図６
（ａ）に示すように発錆はなく、また不具合品Ｂ1 ，Ｂ
2 ，Ｂ3 はそれぞれ（ｂ），（ｃ），（ｄ）に示すよう
に発錆した。これにより、Ｆｅ2+イオン反応が見られる
ものは殆どが発錆していることがわかる。しかし、その
Ｆｅ2+イオン反応が見られても発錆したい所も見られ
た。Next, the same test piece was subjected to a corrosion resistance test. The conditions of this corrosion resistance test were a temperature of 80 ° C., a relative humidity of 90%, and a test time of 100 hours. The results of examining the rusting site and the rusting score after carrying out this test are shown in FIG.
As shown in (b), (c) and (d). 5 and 6 correspond to each other, and the normal product A is shown in FIG.
As shown in (a), there is no rust and defective products B 1 and B
2 and B 3 rusted as shown in (b), (c), and (d), respectively. As a result, it can be seen that most of those showing the Fe 2+ ion reaction have rusted. However, even if the Fe 2+ ion reaction was observed, there were some places where rusting was desired.
【００１８】図７に耐食性試験前に求めたＦｅ2+イオン
反応点数と試験後の発錆点数をプロットしたものであ
り、相関分析を実施した結果、危険率１％で有意差あり
と判断され、両間には強い相関があることがわかった。FIG. 7 is a plot of Fe 2+ ion reaction points obtained before the corrosion resistance test and rusting points after the test. As a result of correlation analysis, it was judged that there was a significant difference at a risk rate of 1%. , It turned out that there is a strong correlation between the two.
【００１９】実施例３ 図８，図９に具体的に実機のクロムめっきを施したシリ
ンダロッド１３における耐食性評価装置１４を示す。こ
れの構成は、シリンダロッド１３をはさみ込むようにし
た半割り状のケース１５をボルト１６にてシリンダロッ
ド１３を囲繞して組立てる。これの中に電解溶液である
３％の食塩水１７を給排水口１８より充満させる。１９
は漏れ止めの０リングである。金属電極２には白金板を
用い、シリンダロッド１３より１０ｍｍ離れた位置のケ
ース１５の内面全周に取付け、取出し口２０よりこれの
リード線２１を引き出す。またシリンダロッド１３側の
リード線２２は、ロッド母材部よりスポット溶接して引
き出す。両リード線２０，２１間には、４９５Ωの抵抗
を並列に接続し、レコーダで電圧を測定した。電圧測定
後、塩水噴霧試験を実施し、測定電圧と発錆ロッドとの
相関を確認した。その電位測定結果及び、塩水噴霧試験
結果を図１０に示す。測定電圧は、一義的に初期電圧と
測定に際しての変動電位（△Ｖ）とで決定し、母材へ貫
通するクラック数が多ければ初期電圧は、よりＦｅロッ
ド（めっき未処理）に近い電位を示す。また仕上げバフ
を施し、母材へ貫通するクラックが非常に少ないロッド
については、よりゼロＶに近い初期電位を示す。変動電
位は、白金電極と母材（Ｆｅ）との反応有無を推定で
き、プラス側はクラックまたは、ピンホールを介して母
材との反応が進みゼロＶよりマイナス側はそれが起こっ
ていないことが表１に示す測定電圧より判断できる。ま
た、図１０において、塩水噴霧試験結果、発錆したロッ
ドを白抜き丸で示す。これにより、反応が起きているロ
ッド（△Ｖがプラス側にあるロッド）の殆どが発錆して
おり、両者で強い相関があることがわかった。Embodiment 3 FIGS. 8 and 9 specifically show a corrosion resistance evaluation apparatus 14 for a chrome-plated cylinder rod 13 of an actual machine. With this configuration, a half-divided case 15 in which the cylinder rod 13 is sandwiched is assembled by surrounding the cylinder rod 13 with bolts 16. A 3% saline solution 17 which is an electrolytic solution is filled in this through a water supply / drain port 18. 19
Is a leak-proof O-ring. A platinum plate is used as the metal electrode 2 and is attached to the entire inner surface of the case 15 at a position 10 mm away from the cylinder rod 13, and a lead wire 21 of the metal electrode 2 is pulled out from the outlet 20. The lead wire 22 on the cylinder rod 13 side is spot-welded and pulled out from the rod base material. A resistance of 495Ω was connected in parallel between both lead wires 20 and 21, and the voltage was measured with a recorder. After measuring the voltage, a salt spray test was performed to confirm the correlation between the measured voltage and the rust-forming rod. The potential measurement result and the salt spray test result are shown in FIG. The measurement voltage is uniquely determined by the initial voltage and the fluctuating potential (ΔV) at the time of measurement. If the number of cracks penetrating the base material is large, the initial voltage is closer to that of the Fe rod (unplated). Show. Further, the rod subjected to finishing buffing and having very few cracks penetrating into the base material exhibits an initial potential closer to zero V. The fluctuating potential can be estimated whether or not the platinum electrode reacts with the base material (Fe), and the positive side is cracked or the reaction with the base material progresses through the pinhole and the negative side from zero V does not occur. Can be judged from the measured voltage shown in Table 1. Further, in FIG. 10, the salt spray test results, the rods that rusted are indicated by white circles. As a result, it was found that most of the rods in which the reaction occurred (rods with ΔV on the plus side) rusted, and there was a strong correlation between the two.
【００２０】上記各実施例において、めっき材料は母材
質と異なる物質で乾式及び湿質めっき、または、蒸着、
コーティング、塗料等がある。また電解溶液を構成する
電解質としては、少なくとも塩化ナトリウムを含み、そ
の濃度は０．０１〜４０％が適当である。さらに基準電
極に白金以外に、金、銀等の箔状及び棒状のものが用い
られる。そしてさらに、電位検出手段としては電位計や
レコーダがある。また測定電位の出力インピーダレスが
１ｃｍ2 あたり１Ω〜１ＫΩとなるように抵抗を選択す
る。In each of the above embodiments, the plating material is a substance different from the base material, dry and wet plating, or vapor deposition,
There are coatings and paints. The electrolyte that constitutes the electrolytic solution contains at least sodium chloride, and its concentration is preferably 0.01 to 40%. In addition to platinum, a foil-shaped or rod-shaped reference electrode made of gold, silver or the like is used as the reference electrode. Further, as the potential detecting means, there are an electrometer and a recorder. The resistance is selected so that the output impedance of the measured potential is 1Ω to 1KΩ per cm 2 .
【００２１】[0021]
【発明の効果】本発明によれば、非破壊試験で、かつ短
時間に部品レベル及び、製品レベル（または現場）の主
要部位の耐食性がわかり、さらに、出荷段階で、全数試
験を実施することにより、製品の品質保証ができ、発錆
不具合にかかわるクレームを低減できる。According to the present invention, it is possible to know the corrosion resistance of the main parts at the component level and the product level (or on-site) in a short time in a non-destructive test, and further, to perform a 100% test at the shipping stage. As a result, product quality can be guaranteed, and complaints related to rusting defects can be reduced.
【図１】本発明の基本原理を示す説明図である。FIG. 1 is an explanatory diagram showing the basic principle of the present invention.
【図２】本発明の実施例を示す縦断側面図である。FIG. 2 is a vertical sectional side view showing an embodiment of the present invention.
【図３】本発明の実施例を示す縦断正面図である。FIG. 3 is a vertical sectional front view showing an embodiment of the present invention.
【図４】測定時間に対する発生電圧を示す線図である。FIG. 4 is a diagram showing generated voltage with respect to measurement time.
【図５】（ａ），（ｂ），（ｃ），（ｄ）は電位測定の
Ｆｅ2+イオン反応部位と反応点数を示す説明図である。5 (a), (b), (c), and (d) are explanatory views showing Fe 2+ ion reaction sites and reaction points in potential measurement.
【図６】（ａ），（ｂ），（ｃ），（ｄ）はＦｅ2+イオ
ン反応と耐食性試験後の発錆部位を示す説明図である。6 (a), (b), (c) and (d) are explanatory views showing a rusted portion after Fe 2+ ion reaction and a corrosion resistance test.
【図７】Ｆｅ2+イオン反応数（試験前）と耐食性試験後
の発錆部との相関を示す線図である。FIG. 7 is a diagram showing the correlation between the number of Fe 2+ ion reactions (before the test) and the rusted portion after the corrosion resistance test.
【図８】本発明の具体的な実施例を示す縦断正面図であ
る。FIG. 8 is a vertical sectional front view showing a specific example of the present invention.
【図９】本発明の具体的な実施例を示す縦断側面図であ
る。FIG. 9 is a vertical sectional side view showing a specific example of the present invention.
【図１０】本発明の具体的な実施例における電位測定結
果及び塩水噴霧試験結果を示す線図である。FIG. 10 is a diagram showing potential measurement results and salt spray test results in specific examples of the present invention.
【図１１】電解溶液中に金属を浸漬したときの界面に電
位が生じることを示す説明図である。FIG. 11 is an explanatory diagram showing that a potential is generated at the interface when a metal is immersed in an electrolytic solution.
１…電解溶液、２…基準電極、３…電位計、４…めっき
層、５…母材、６…被試験片、６ａ…母材、７…ブラケ
ット、８…食塩水、９…リード端子、１０…抵抗、１１
…レコーダ、１２…クロムめっき層、１３…シリンダロ
ッド、１５…ケース、１６…ボルト、１８…給排水口、
１９…０リング、２０…取出し口、２１，２２…リード
線。DESCRIPTION OF SYMBOLS 1 ... Electrolyte solution, 2 ... Reference electrode, 3 ... Electrometer, 4 ... Plating layer, 5 ... Base material, 6 ... Test piece, 6a ... Base material, 7 ... Bracket, 8 ... Saline solution, 9 ... Lead terminal, 10 ... Resistance, 11
... recorder, 12 ... chrome plating layer, 13 ... cylinder rod, 15 ... case, 16 ... bolt, 18 ... water supply / drainage port,
19 ... O-ring, 20 ... Ejection port 21, 22 ... Lead wire.
フロントページの続き (72)発明者 中西 広幸 神奈川県平塚市万田1200 株式会社小松製 作所研究所内Front page continued (72) Inventor Hiroyuki Nakanishi 1200 Manda, Hiratsuka-shi, Kanagawa Komatsu Ltd. Research Laboratory
Claims (6)
試験片と基準電極とを電解溶液中に浸漬し、この両部材
間の電位差の経時変化から上記被試験片の耐食性を評価
するようにしたことを特徴とするめっきの耐食性評価方
法。1. A test piece plated with a conductive base material and a reference electrode are immersed in an electrolytic solution, and the corrosion resistance of the test piece is evaluated from the change with time in the potential difference between the two members. A corrosion resistance evaluation method for plating, which is characterized by the above.
試験片にて開口部が液密に閉じられ、かつ内部に電解溶
液と基準電極を内装した絶縁性を有する容器と、上記基
準電極と被試験片の母材間の電位を測定する電位検出手
段とからなっていることを特徴とするめっきの耐食性評
価装置。2. An insulative container in which an opening is liquid-tightly closed by a test piece plated with a conductive base material and an electrolytic solution and a reference electrode are internally provided, and the above-mentioned reference. An apparatus for evaluating corrosion resistance of plating, comprising: an electric potential detecting means for measuring an electric potential between an electrode and a base material of a test piece.
式及び湿式めっき、または蒸着、コーティング、塗料か
らなるものであることを特徴とする請求項１，２記載の
めっきの耐食性評価方法及びその装置。3. The method for evaluating corrosion resistance of plating according to claim 1, wherein the plating material is a substance different from the base material, and is dry or wet plating, or vapor deposition, coating, or paint. apparatus.
くとも塩化ナトリウムを含み、その濃度は、０．０１〜
４０％であることを特徴とする請求項１，２記載のめっ
きの耐食性評価方法及びその装置。4. An electrolyte that comprises at least sodium chloride as an electrolyte constituting the electrolytic solution, and has a concentration of 0.01 to
It is 40%, The corrosion resistance evaluation method of plating of Claim 1, 2 and its apparatus.
の箔状、棒状となっていることを特徴とする請求項１，
２記載のめっきの耐食性評価方法及びその装置。5. The material of the reference electrode is a foil or rod of platinum, gold, silver or the like.
2. The method for evaluating corrosion resistance of plating according to 2 and its apparatus.
ダであり、測定電位の出力インピーダンスが１ｃｍ2 あ
たり１Ω〜１ＫΩからなっていることを特徴とする請求
項２記載のめっきの耐食性評価装置。6. The plating corrosion resistance evaluation apparatus according to claim 2, wherein the potential detecting means is an electrometer or a recorder, and the output impedance of the measured potential is 1 Ω to 1 KΩ per cm 2 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7323192A JPH05232072A (en) | 1992-02-25 | 1992-02-25 | Method and device for evaluating anticorrosion of plating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7323192A JPH05232072A (en) | 1992-02-25 | 1992-02-25 | Method and device for evaluating anticorrosion of plating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05232072A true JPH05232072A (en) | 1993-09-07 |
Family
ID=13512208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7323192A Pending JPH05232072A (en) | 1992-02-25 | 1992-02-25 | Method and device for evaluating anticorrosion of plating |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05232072A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU670738B3 (en) * | 1996-02-14 | 1996-07-25 | Ameron, Inc. | Detection of potential for corrosion of steel reinforced composite pipe |
| JP2013072647A (en) * | 2011-09-26 | 2013-04-22 | Idemitsu Kosan Co Ltd | Method and device for evaluating performance of protective film |
| AU2010280757B2 (en) * | 2009-08-04 | 2013-10-17 | Ball Europe Gmbh | Device and method for surface processing having a test station |
| KR101878564B1 (en) * | 2016-10-18 | 2018-07-13 | 한국에너지기술연구원 | Coating QC device for the electrical conductive cable and the operation thereof |
| CN111145839A (en) * | 2019-12-26 | 2020-05-12 | 一汽解放汽车有限公司 | Medium for simulating part corrosion under cold condition and simulation method thereof |
| CN114324139A (en) * | 2020-09-29 | 2022-04-12 | 马自达汽车株式会社 | Corrosion resistance test method for clad metal material and aqueous material used for the method |
-
1992
- 1992-02-25 JP JP7323192A patent/JPH05232072A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU670738B3 (en) * | 1996-02-14 | 1996-07-25 | Ameron, Inc. | Detection of potential for corrosion of steel reinforced composite pipe |
| AU2010280757B2 (en) * | 2009-08-04 | 2013-10-17 | Ball Europe Gmbh | Device and method for surface processing having a test station |
| US9644938B2 (en) | 2009-08-04 | 2017-05-09 | Ball Packaging Europe Gmbh | Device and method for surface processing having a test station |
| JP2013072647A (en) * | 2011-09-26 | 2013-04-22 | Idemitsu Kosan Co Ltd | Method and device for evaluating performance of protective film |
| KR101878564B1 (en) * | 2016-10-18 | 2018-07-13 | 한국에너지기술연구원 | Coating QC device for the electrical conductive cable and the operation thereof |
| CN111145839A (en) * | 2019-12-26 | 2020-05-12 | 一汽解放汽车有限公司 | Medium for simulating part corrosion under cold condition and simulation method thereof |
| CN114324139A (en) * | 2020-09-29 | 2022-04-12 | 马自达汽车株式会社 | Corrosion resistance test method for clad metal material and aqueous material used for the method |
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