JPH09297116A - Corrosion measuring device for metallic material - Google Patents
Corrosion measuring device for metallic materialInfo
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- JPH09297116A JPH09297116A JP8132675A JP13267596A JPH09297116A JP H09297116 A JPH09297116 A JP H09297116A JP 8132675 A JP8132675 A JP 8132675A JP 13267596 A JP13267596 A JP 13267596A JP H09297116 A JPH09297116 A JP H09297116A
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- sample test
- test piece
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、金属材質の腐食測
定に適用される腐食測定装置に関し、さらに詳しくは、
金属材質の腐食測定方法としての重量減測定法と電気化
学的測定法との双方を同時に実施可能にした金属材質の
腐食測定装置に係るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring corrosion of metal materials, and more particularly, to an apparatus for measuring corrosion.
The present invention relates to a metal material corrosion measuring device capable of simultaneously performing both a weight loss measuring method and an electrochemical measuring method as a metal material corrosion measuring method.
【０００２】[0002]
【従来の技術および発明が解決しようとする課題】一般
に、この種の金属材質の腐食速度評価方法としては、従
来からよく知られているように、重量減少測定法（クー
ポン法または浸漬試験法）と電気化学的測定法（電気抵
抗法、直流分極抵抗法、インピーダンス法、電気化学雑
音法）とがある。ここで、これらの各測定法におけるそ
れぞれの概要と作用の得失との詳細を次に述べる。2. Description of the Related Art Generally, as a method for evaluating the corrosion rate of a metal material of this type, as is well known in the art, a weight loss measuring method (coupon method or immersion test method) is used. And electrochemical measurement methods (electric resistance method, direct current polarization resistance method, impedance method, electrochemical noise method). Here, the outline of each of these measuring methods and details of advantages and disadvantages of the action will be described below.
【０００３】前記クーポン法（浸漬試験法）は、絶縁保
持した試料試験片（クーポン）を回収可能に試料溶液中
へ浸漬して放置するか、あるいは試料ガス雰囲気中に放
置して腐食を進行（該腐食に伴って試料試験片自体の重
量が減少する）させ、所定期間（通常の場合、３０日〜
９０日程度）経過毎に回収して、該試料試験片の経過期
間内での腐食による累積損失量、ここでは重量減少を測
定し、該測定重量値から実際の試料試験片の腐食率を類
推して評価する手段である。In the coupon method (immersion test method), a sample test piece (coupon) held by insulation is dipped in a sample solution so that it can be recovered, or left in a sample gas atmosphere for corrosion ( The weight of the sample test piece itself is reduced along with the corrosion, and the sample test piece itself is kept for a predetermined period (usually 30 days to
About 90 days), the accumulated loss due to corrosion within the elapsed period of the sample test piece, here the weight loss is measured, and the actual corrosion rate of the sample test piece is estimated from the measured weight value. It is a means to evaluate.
【０００４】本クーポン法では、（ａ）試料試験片の腐
食速度をリアルタイムで測定できないこと、（ｂ）試験
開始前における試料試験片の重量測定と試験終了後にお
ける腐食生成物の影響を受けた重量測定とに測定エラー
を生じ易く、該測定操作に十分な熟練が必要であるこ
と、（ｃ）試料試験片の局部的な腐食を測定できないこ
となどの問題点がある。In the present coupon method, (a) the corrosion rate of the sample test piece cannot be measured in real time, and (b) the weight measurement of the sample test piece before the start of the test and the corrosion products after the test were affected. There are problems that a measurement error is likely to occur in the weight measurement, sufficient skill is required for the measurement operation, and (c) local corrosion of the sample test piece cannot be measured.
【０００５】前記電気抵抗法は、試料試験片を試料溶液
中へ浸漬させたままの状態に維持するか、あるいは試料
ガス雰囲気中に保持させたままの状態に維持して腐食を
進行（該腐食に伴う試料試験片自体の断面積の減少に対
応して、その電気抵抗値が増加する）させ、ここでも所
定時間（通常の場合、数時間〜数日間程度）毎に該試料
試験片の電気抵抗値を測定してグラフ上にプロットし、
該測定抵抗値勾配から該当時間における試料試験片の平
均腐食速度を求めて評価する手段である。In the electric resistance method, the sample test piece is maintained in the state of being immersed in the sample solution or in the state of being kept in the sample gas atmosphere to proceed with the corrosion (the corrosion). The electrical resistance value of the sample test piece increases in response to the decrease in the cross-sectional area of the sample test piece itself, and the electrical conductivity of the sample test piece is again measured at predetermined intervals (usually, several hours to several days). Measure the resistance value and plot it on the graph,
It is a means for obtaining and evaluating the average corrosion rate of the sample test piece at the relevant time from the measured resistance gradient.
【０００６】本電気抵抗法においても、（ａ）試料試験
片の腐食速度をリアルタイムで測定できないこと、
（ｂ）測定感度が低くて温度の影響も大きく、また、高
感度では測定プローブの耐用寿命が短く、温度ノイズの
補正ができないこと、（ｃ）試料試験片の局部的な腐食
を測定できないことなどの問題点がある。Also in the present electric resistance method, (a) the corrosion rate of the sample test piece cannot be measured in real time,
(B) The measurement sensitivity is low and the influence of temperature is large, and the high sensitivity has a short useful life of the measurement probe and cannot correct temperature noise, and (c) cannot measure the local corrosion of the sample test piece. There are problems such as.
【０００７】前記直流分極抵抗法は、同一材質および大
きさによる一組の試料試験片を導電性試料溶液中へ浸漬
させたままの状態に維持して腐食を進行（この場合、試
料試験片の化学的腐食は金属原子の酸化に起因して発生
する）させ、ここでは二つの等質金属間に微少電圧を印
加したときに流れる直流電流から腐食電流を測定し得る
というSTEARN-GEARYの下記式In the DC polarization resistance method, a set of sample test pieces of the same material and size are kept immersed in the conductive sample solution to proceed with corrosion (in this case, Chemical corrosion occurs due to the oxidation of metal atoms), and here the corrosion current can be measured from the direct current that flows when a minute voltage is applied between two homogeneous metals.
【式１】 を用い、該各試料試験片の相互間に印加される微少電位
差（１０ｍＶ程度）によって生ずる直流電流を測定し、
該測定電流値から試料試験片の全面腐食速度を求めて評
価する手段である。(Equation 1) Is used to measure a direct current generated by a minute potential difference (about 10 mV) applied between the respective sample test pieces,
This is a means for obtaining and evaluating the general corrosion rate of the sample test piece from the measured current value.
【０００８】本直流分極抵抗法では、利点として試料試
験片の腐食速度をリアルタイムで測定できはするが、一
方において、（ａ）試料試験片の腐食試験が導電性試料
溶液中での測定にのみ限定され、試料ガス雰囲気中での
測定ができないこと、（ｂ）測定結果が導電性試料溶液
内に生ずる堆積物の影響を受けること、（ｃ）測定に際
しての温度の影響が大（温度ノイズ）であって、温度補
正ができないこと、（ｄ）試料試験片の局部的な腐食を
測定できないことなどの問題点がある。In the DC polarization resistance method, the corrosion rate of the sample test piece can be measured in real time as an advantage, but on the other hand, (a) the corrosion test of the sample test piece can be performed only in the conductive sample solution. Limited, measurement in a sample gas atmosphere is not possible, (b) measurement results are affected by the deposits generated in the conductive sample solution, (c) temperature influence during measurement is large (temperature noise) However, there are problems that the temperature cannot be corrected, and (d) the local corrosion of the sample test piece cannot be measured.
【０００９】前記インピーダンス法は、ＬＰＲＭ（Line
ar Polarization Resistance）において、試料試験片を
導電性試料溶液中へ浸漬させたままの状態に維持して腐
食を進行させ、高周波電源による摂動法により、導電性
試料溶液の電気抵抗と分極抵抗とを区分して測定し、該
分極抵抗の測定精度を高めて試料試験片の腐食速度を求
める評価手段である。The impedance method is based on LPRM (Line
ar Polarization Resistance), the sample test piece is kept immersed in the conductive sample solution to promote corrosion, and the electrical resistance and polarization resistance of the conductive sample solution are measured by the perturbation method using a high frequency power source. This is an evaluation means for measuring the corrosion resistance of the sample test piece by measuring it separately and increasing the measurement accuracy of the polarization resistance.
【００１０】本インピーダンス法では、利点として試料
試験片の腐食速度をリアルタイムで測定でき（但し、デ
ータ処理に相応の時間が必要）ると共に、併せて、測定
精度を向上させ得るのであるが、一方において、（ａ）
ここでも、試料試験片の腐食試験が導電性試料溶液中で
の測定にのみ限定され、試料ガス雰囲気中での測定がで
きないこと、（ｂ）測定結果が導電性試料溶液内に生ず
る堆積物の影響を受けること、（ｃ）測定に際して温度
の影響が大（温度ノイズ）であって、温度補正ができな
いこと、（ｄ）試料試験片の局部的な腐食を測定できな
いことなどの問題点がある。This impedance method has the advantage that the corrosion rate of the sample test piece can be measured in real time (however, it takes time to process the data), and at the same time, the measurement accuracy can be improved. In (a)
Here again, the corrosion test of the sample test piece is limited to the measurement in the conductive sample solution, and the measurement in the sample gas atmosphere cannot be performed. (B) The measurement result shows the deposits generated in the conductive sample solution. There are problems such as being affected, (c) temperature effect is large at the time of measurement (temperature noise), temperature correction is not possible, and (d) local corrosion of sample test piece cannot be measured. .
【００１１】前記電気化学雑音法は、同一材質および大
きさによる三つの試料試験片を導電性試料溶液中へ浸漬
させたままの状態に維持するか、あるいは試料ガス雰囲
気中に放置させたままの状態に維持して腐食を進行さ
せ、自然電位での状態で、第１の試料試験片と第２の試
料試験片間の微少電位差（電気化学雑音電位）および第
２の試料試験片と第３の試料試験片間の微少電流差（電
気化学雑音電流）の変動をリアルタイムで測定すると共
に、所定時間毎にデータ処理を行なって、その平均電流
から試料試験片の全面腐食速度を、Ｒn ＝Ｖn ／Ｉn の
二乗平均値から試料試験片の局部腐食速度をそれぞれに
測定して評価する手段であり、ここで、前記Ｖn はｍＶ
以下（１Ｈｚ以下）、Ｉn はμＡ以下である。In the electrochemical noise method, three sample test pieces of the same material and size are maintained in a state of being immersed in a conductive sample solution, or left in a sample gas atmosphere. In the state of natural potential, the micropotential difference (electrochemical noise potential) between the first sample test piece and the second sample test piece and the second sample test piece and the third sample The fluctuation of the minute current difference (electrochemical noise current) between the sample test pieces is measured in real time, and data processing is performed at every predetermined time, and the average corrosion rate of the sample test piece is calculated as R n = It is a means for measuring and evaluating the local corrosion rate of each sample test piece from the root mean square value of V n / I n , where V n is mV.
Below (1 Hz or less), I n is below μA.
【００１２】そして、この場合、前記腐食の識別は、次
のようになされる。全面腐食については、電気化学的な
腐食反応がミクロな領域内で均一に発生するから、ここ
では測定結果がランダムな信号の重畳（統計的な処理）
となり、該全面腐食がある範囲内のベース信号となる。
即ち、Ｖｍｅａｎ1 、Ｉｍｅａｎ0 である。また、局部
腐食については、これがある程度広い領域内で不均一に
発生し、このためにランダムな信号となり、且つこのラ
ンダムな信号は、腐食の過渡現象を表わしているので、
その信号波形によって腐食速度の識別が可能になる。In this case, the corrosion is identified as follows. For general corrosion, the electrochemical corrosion reaction occurs uniformly in the microscopic area, so the measurement results here are random signals superimposed (statistical processing).
And becomes a base signal within the range where the general corrosion occurs.
That is, Vmean 1 and Imean 0 . Further, with respect to local corrosion, this occurs nonuniformly in a wide area to some extent, which results in a random signal, and since this random signal represents a transient phenomenon of corrosion,
The signal waveform makes it possible to identify the corrosion rate.
【００１３】従って、本電気化学雑音法では、（ａ）試
料試験片の自然電位における腐食モニターが可能である
こと、（ｂ）試料試験片の腐食速度をリアルタイムで測
定できること、（ｃ）非導電性媒体（試料溶液またはガ
ス）中での試料試験片の腐食速度の測定が可能であるこ
と、（ｄ）測定結果が試料溶液内に生ずる堆積物の影響
を受けないこと、（ｅ）試料試験片の局部的な腐食の測
定が可能であること、（ｆ）試料試験片の高温腐食の測
定が可能であることなどの利点を有しているという反面
で、前記クーポン法（浸漬試験法）におけるように、腐
食に伴う試料試験片自体の重量減少から腐食速度を定量
化するという最も基本的な手段を講じ得ないものであっ
た。Therefore, in the present electrochemical noise method, (a) it is possible to monitor the corrosion of the sample test piece at the natural potential, (b) it is possible to measure the corrosion rate of the sample test piece in real time, and (c) it is non-conductive. It is possible to measure the corrosion rate of the sample test piece in the volatile medium (sample solution or gas), (d) the measurement result is not affected by the deposits generated in the sample solution, (e) the sample test The coupon method (immersion test method), on the other hand, has the advantages of being able to measure the local corrosion of the piece and (f) being capable of measuring the high temperature corrosion of the sample test piece. As in the above, the most basic means of quantifying the corrosion rate cannot be taken from the weight loss of the sample test piece itself due to corrosion.
【００１４】以上の各測定法を要約して比較すると、次
の第１表のようになる。When the above measuring methods are summarized and compared, the results are shown in Table 1 below.
【表１】 [Table 1]
【００１５】以上のように、従来の場合は、金属材質の
腐食測定を行なうために、上記した重量減少測定法また
は電気化学的測定法の何れか一方を適用し、それぞれの
各測定法を個々に単独で用いて測定する手段しか知られ
ておらず、しかも、これらの各測定法は、目的に応じて
それぞれに得失を有しており、必ずしも効果的な測定結
果ないしは評価をなし得ないものであった。As described above, in the conventional case, in order to measure the corrosion of the metal material, either one of the weight loss measuring method and the electrochemical measuring method described above is applied, and each measuring method is individually applied. There are only known means for measuring by itself, and each of these measuring methods has its own advantages and disadvantages depending on the purpose, and it is not always possible to make effective measurement results or evaluation. Met.
【００１６】本発明は、このような従来の実情に鑑み、
これらの問題点を解消するためになされたもので、その
目的とするところは、重量減少測定法と電気化学的測定
法との各測定法の双方を同時に適用して所期通りの測定
評価を行ない得るようにした金属材質の腐食測定装置を
提供することである。The present invention has been made in view of such conventional circumstances.
It was made to solve these problems, and the purpose is to apply both the weight loss measurement method and the electrochemical measurement method at the same time to perform the measurement evaluation as expected. (EN) Provided is a corrosion measuring device for metallic materials, which can be performed.
【００１７】[0017]
【課題を解決するための手段】前記目的を達成するため
に、本発明に係る請求項１に記載の発明は、金属材質の
腐食測定に適用する腐食測定装置であって、測定対象の
金属を整形して得た複数個の試料試験片および該各試料
試験片を各別に保持して電気的に接続されたそれぞれの
各電極端子と、腐食作用を得る試料溶液を収容した試験
容器とを設け、前記試験容器の上方開口部に前記各電極
端子を配置すると共に、該各電極端子に保持された前記
各試料試験片を前記試料溶液中に浸漬させて構成し、前
記複数個の電極端子または選択された各電極端子を介し
前記各試料試験片を測定回路装置に接続させて、前記試
料溶液への浸漬による任意時間経過中の各試料試験片の
腐食変化の状態および／または所定時間経過後の各試料
試験片の腐食程度を電気化学的測定法によって測定可能
とし、併せて、前記試料溶液による所定時間経過後の各
試料試験片の腐食に伴う重量減少ひいては腐食程度を重
量減少測定法によって測定可能とし、これらの各腐食測
定によって前記試料試験片の腐食速度を評価し得るよう
にしたことを特徴とする金属材質の腐食測定装置であ
る。In order to achieve the above object, the invention according to claim 1 of the present invention is a corrosion measuring apparatus applied to the corrosion measurement of a metal material, wherein the metal to be measured is Providing a plurality of sample test pieces obtained by shaping and each electrode terminal electrically connected by holding each of the sample test pieces separately, and a test container containing a sample solution that exerts a corrosive action , The electrode terminals are arranged in the upper opening of the test container, and the sample test pieces held by the electrode terminals are immersed in the sample solution to form the plurality of electrode terminals. By connecting each of the sample test pieces to the measurement circuit device through each of the selected electrode terminals, the state of the corrosion change of each sample test piece during the elapse of an arbitrary time by immersion in the sample solution and / or after the elapse of a predetermined time Degree of corrosion of each sample test piece It is possible to measure by an electrochemical measurement method, and at the same time, it is possible to measure the weight loss due to the corrosion of each sample test piece after the lapse of a predetermined time by the sample solution and thus the degree of corrosion by the weight loss measurement method. A corrosion measuring apparatus for a metal material, characterized in that the corrosion rate of the sample test piece can be evaluated by the above.
【００１８】従って、本発明装置では、同一の装置構成
によって金属材質の腐食測定に電気化学的測定法および
重量減少測定法のそれぞれを同時に適用でき、これらの
各測定法のもつそれぞれの利点を最大限に活用した腐食
測定を同時に効果的且つ容易に実現し得るもので、前記
従来の各問題点が全て解消される。Therefore, in the apparatus of the present invention, the electrochemical measurement method and the weight loss measurement method can be simultaneously applied to the corrosion measurement of the metal material by the same apparatus configuration, and the respective advantages of these measurement methods can be maximized. It is possible to simultaneously and effectively realize the corrosion measurement that has been utilized as much as possible, and all of the above-mentioned conventional problems can be solved.
【００１９】[0019]
【発明の実施の形態】以下、本発明に係る金属材質の腐
食測定装置の実施形態例につき、図１ないし図６を参照
して詳細に説明する。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a metal material corrosion measuring apparatus according to the present invention will be described below in detail with reference to FIGS.
【００２０】図１（ａ）、（ｂ）は、本実施形態例を適
用した腐食測定装置の測定手段を除く全体構成の概要を
示す外観正面図（同図（ａ））および平面図（同図
（ｂ））であり、また、図２は、同上図１（ｂ）におけ
るＡ−Ａ線部の縦断面図、図３は、同上要部の分解斜視
図である。FIGS. 1 (a) and 1 (b) are an external front view (FIG. 1 (a)) and a plan view (same as FIG. 1) showing the outline of the entire configuration of the corrosion measuring apparatus to which the present embodiment is applied, excluding the measuring means. 2 (b)), FIG. 2 is a vertical cross-sectional view taken along the line AA in FIG. 1 (b), and FIG. 3 is an exploded perspective view of the main part of the same.
【００２１】これらの図１ないし図３に示す装置構成に
おいて、本実施形態例による腐食測定装置は、主体とな
る試験容器１１と、測定対象の金属を所要形状に整形加
工して得た複数個、ここでは３個の試料試験片２１およ
び各試料試験片２１を各別に保持した状態で電気的に接
続された各電極端子３１とを有している。In the apparatus configuration shown in FIGS. 1 to 3, the corrosion measuring apparatus according to the present embodiment is composed of a test container 11 as a main body and a plurality of pieces obtained by shaping a metal to be measured into a required shape. Here, it has three sample test pieces 21 and each electrode terminal 31 electrically connected in a state of holding each sample test piece 21 separately.
【００２２】前記試験容器１１は、この場合、実質的に
耐腐食性の上方が開口されたガラス瓶からなっており、
該上方開口部には、蓋部材１２が密に被嵌して締着され
ると共に、内部に腐食作用を得るための試料溶液１３を
収容してある。The test container 11 in this case consists of a glass bottle with a substantially corrosion-resistant upper opening,
The lid member 12 is tightly fitted and tightened in the upper opening, and a sample solution 13 for obtaining a corrosive action is accommodated therein.
【００２３】前記３個の各試料試験片２１は、この場
合、実質的に所要直径および所要長さの丸棒形状に加工
され、且つ加工履歴を排除するための所要の事後処理を
施したもので、該各試料試験片２１については、耐腐食
材としてのテフロン管３２で被覆されたネジ棒などから
なる同数の前記各電極端子３１によって螺合保持されて
おり、ここでは該各電極端子３１の上端部を前記蓋部材
１２に所定間隔を隔てて列状に開穿した個々の各支持孔
１４に挿通した後に、該上端部を支持ナット３３で締着
することにより、各試料試験片２１が前記試料溶液１３
中に浸漬されるようになっている。In this case, each of the three sample test pieces 21 is processed into a round bar shape having substantially the required diameter and the required length, and is subjected to the required post-treatment for eliminating the processing history. Each sample test piece 21 is screwed and held by the same number of the electrode terminals 31 made of a screw rod covered with a Teflon tube 32 as a corrosion resistant material. After inserting the upper end portion of each of the support holes 14 into each of the support holes 14 formed in a row at a predetermined interval in the lid member 12, the upper end portion is fastened with a support nut 33, so that each sample test piece 21 Is the sample solution 13
It is immersed inside.
【００２４】また、前記蓋部材１２には、別に１組の注
入口が開穿され、一方の注入口に対しては、前記試験容
器１１内に試料溶液１３を注入するための注入嘴１５を
螺着し、他方の注入口に対しては、前記試料溶液１３を
注入した後の内部を脱酸素雰囲気に維持する脱酸素ガス
を注入するための同様に注入嘴１６を螺着して構成す
る。A separate set of inlets is opened in the lid member 12, and an inlet beak 15 for injecting the sample solution 13 into the test container 11 is provided for one inlet. An injection beak 16 is similarly screwed into the other injection port for injecting a deoxidized gas that maintains the inside of the sample solution 13 in a deoxygenated atmosphere after injecting the sample solution 13. .
【００２５】続いて、上記実施態様例による装置構成を
用い、先に述べた重量減少測定法と電気化学的測定法と
による腐食測定を実行する場合の数例を挙げる。Next, several examples will be given in the case where the apparatus configuration according to the above-mentioned embodiment is used to perform the corrosion measurement by the weight loss measuring method and the electrochemical measuring method described above.
【００２６】図４は、本腐食測定装置によって前記クー
ポン法と直流分極抵抗計測またはインピーダンス計測と
を同時に実施する場合の接続例を示すブロック図であ
り、この場合には、２本の各試料試験片２１にポテンシ
ョスタット４１を接続して所期通りの腐食測定を実行す
る。また、図５は、同様にクーポン法と電気化学雑音計
測とを同時に実施する場合の接続例を示すブロック図で
あり、この場合には、３本の各試料試験片２１に電気化
学雑音測定装置４２を接続して所期通りの腐食測定を実
行する。さらに、図６は、同様にクーポン法と腐食電位
計測とを同時に実施する場合の接続例を示すブロック図
であり、この場合には、別に公知の如く照合電極５１お
よび選択された１本の試料試験片２１に先端部を対向さ
せたルギン管５２を用意すると共に、３本の各試料試験
片２１および照合電極５１にデジタルマルチメーター４
３を接続して所期通りの腐食測定を実行する。FIG. 4 is a block diagram showing a connection example when the coupon method and the DC polarization resistance measurement or the impedance measurement are simultaneously performed by the present corrosion measuring apparatus. In this case, two sample tests are performed. The potentiostat 41 is connected to the piece 21 and a desired corrosion measurement is performed. Further, FIG. 5 is a block diagram showing a connection example when the coupon method and the electrochemical noise measurement are simultaneously performed in the same manner. In this case, the electrochemical noise measuring device is attached to each of the three sample test pieces 21. Connect 42 to perform the desired corrosion measurements. Further, FIG. 6 is a block diagram showing a connection example in the case where the coupon method and the corrosion potential measurement are simultaneously performed in the same manner. In this case, the reference electrode 51 and one selected sample are separately known as well. A Luggin tube 52 having its tip end opposed to the test piece 21 is prepared, and the digital multimeter 4 is attached to each of the three sample test pieces 21 and the reference electrode 51.
Connect 3 to perform the desired corrosion measurement.
【００２７】これらの各実施形態において、前記重量減
少測定法としては、試験開始前に特定される試験試料片
の重量を秤量しておき、所定期間経過後に該当試験試料
片を取り出して再度秤量し、両秤量結果を比較すること
で、先に述べた如く腐食に伴う減肉量を求めて所期通り
の腐食測定を行なうのであり、また、前記電気化学的測
定法としては、上記重量減少測定の実施中にあって、同
時に先に述べた電気化学的測定を実施することで、ここ
でもまた同様に所期通りの腐食測定を行なうのである。
即ち、このようにして本腐食測定装置では、重量減少測
定法と電気化学的測定法との各測定手段の双方を同時に
行なって腐食速度を効果的に評価し得るのである。In each of these embodiments, the weight reduction measuring method is as follows. The weight of the test sample piece specified before the test is started is weighed, and after a predetermined period of time, the test sample piece is taken out and weighed again. By comparing the weighing results, the amount of metal loss due to corrosion is obtained as described above, and the corrosion measurement is performed as expected, and the electrochemical measurement method is the weight loss measurement described above. By carrying out the electrochemical measurement described above at the same time during the execution of the above, the corrosion measurement as expected is again performed here.
That is, in this way, in the present corrosion measuring apparatus, both the weight loss measuring method and the electrochemical measuring method can be simultaneously performed to effectively evaluate the corrosion rate.
【００２８】[0028]
【発明の効果】以上、実施態様例によって詳述したよう
に、本発明によれば、金属材質の腐食測定に適用する腐
食測定装置において、複数個の試料試験片および該各試
料試験片を各別に保持して電気的に接続された各電極端
子と、腐食作用を得る試料溶液を収容した試験容器とを
設け、試験容器の上方開口部に各電極端子を配置した状
態で、各電極端子に保持された各試料試験片を試料溶液
中にそれぞれ浸漬させるようにし、各電極端子または選
択された各電極端子を介して各試料試験片を測定回路装
置に接続させ、試料溶液への浸漬による任意時間経過中
の各試料試験片の腐食変化の状態および／または所定時
間経過後の各試料試験片の腐食程度を電気化学的測定法
によって測定可能にし、併せて、試料溶液による所定時
間経過後の各試料試験片の腐食に伴う重量減少ひいては
腐食程度を重量減少測定法によって測定可能にしたか
ら、同一の装置構成によって金属材質の腐食測定に電気
化学的測定法および重量減少測定法のそれぞれを同時に
適用できるのであり、これらの各測定法のもつそれぞれ
の利点を最大限に活用した腐食測定を効果的且つ容易に
実現できて従来の各問題点を解消し得るのであり、構造
的にも極めて簡単で容易に実施できるなどの実用上有益
な特長がある。As described above in detail with reference to the embodiments, according to the present invention, a plurality of sample test pieces and each of the sample test pieces are provided in the corrosion measuring apparatus applied to the corrosion measurement of the metal material. Each electrode terminal that is separately held and electrically connected, and a test container that contains a sample solution that exerts a corrosive action are provided, and each electrode terminal is placed in the upper opening of the test container. Each retained sample test piece is immersed in the sample solution, and each sample test piece is connected to the measurement circuit device through each electrode terminal or each selected electrode terminal, and the sample solution is immersed in the sample solution. The state of corrosion change of each sample test piece over time and / or the degree of corrosion of each sample test piece after elapse of a predetermined time can be measured by an electrochemical measurement method. Each sample Since the weight loss due to corrosion of the test piece and hence the degree of corrosion can be measured by the weight loss measuring method, the electrochemical measuring method and the weight reducing measuring method can be simultaneously applied to the corrosion measurement of the metal material with the same apparatus configuration. Therefore, it is possible to effectively and easily perform corrosion measurement that makes the best use of the respective advantages of each of these measurement methods, and solve each of the conventional problems, and it is extremely simple and easy in terms of structure. It has practically useful features such as being able to be implemented.
【図１】本発明の実施形態例を適用した腐食測定装置の
測定手段を除く全体構成の概要を示す外観正面図（同図
（ａ））および平面図（同図（ｂ））である。FIG. 1 is an external front view (FIG. (A)) and a plan view (FIG. (B)) showing an outline of the entire configuration of a corrosion measuring apparatus to which an embodiment of the present invention is applied, excluding a measuring unit.
【図２】同上図１（ｂ）におけるＡ−Ａ線部の縦断面図
である。FIG. 2 is a vertical sectional view taken along the line AA in FIG. 1 (b).
【図３】同上要部の分解斜視図である。FIG. 3 is an exploded perspective view of a main part of the same.
【図４】同上実施形態例による腐食測定装置を用いて重
量減少測定法としてのクーポン法（浸漬試験法）と電気
化学的測定法としての直流分極抵抗計測またはインピー
ダンス計測とを同時に実施する場合の接続例を示すブロ
ック図である。FIG. 4 shows a case where a coupon method (immersion test method) as a weight loss measuring method and a DC polarization resistance measurement or an impedance measurement as an electrochemical measuring method are simultaneously performed using the corrosion measuring apparatus according to the above embodiment. It is a block diagram showing an example of connection.
【図５】同上実施形態例による腐食測定装置を用いて重
量減少測定法としてのクーポン法（浸漬試験法）と電気
化学的測定法としての電気化学雑音計測とを同時に実施
する場合の接続例を示すブロック図である。FIG. 5 is a connection example in which a coupon method (immersion test method) as a weight loss measuring method and an electrochemical noise measurement as an electrochemical measuring method are simultaneously performed using the corrosion measuring apparatus according to the embodiment. It is a block diagram shown.
【図６】同上実施形態例による腐食測定装置を用いて重
量減少測定法としてのクーポン法（浸漬試験法）と電気
化学的測定法としての腐食電位計測とを同時に実施する
場合の接続例を示すブロック図である。FIG. 6 shows a connection example in which a coupon method (immersion test method) as a weight loss measuring method and a corrosion potential measurement as an electrochemical measuring method are simultaneously performed using the corrosion measuring apparatus according to the above embodiment. It is a block diagram.
１１ 試験容器 １２ 蓋部材 １３ 試料溶液 １４ 支持孔 １５、１６ 注入嘴 ２１ 試料試験片 ３１ 試料試験片の電極端子 ３２ テフロン管 ３３ 支持ナット ４１ ポテンショスタット（測定回路装置） ４２ 電気化学雑音測定装置（測定回路装置） ４３ デジタルマルチメーター（測定回路装置） ５１ 照合電極 ５２ ルギン管 11 Test Container 12 Lid Member 13 Sample Solution 14 Support Hole 15, 16 Injection Beak 21 Sample Test Piece 31 Sample Test Piece Electrode Terminal 32 Teflon Tube 33 Support Nut 41 Potentiostat (Measuring Circuit Device) 42 Electrochemical Noise Measuring Device (Measurement) Circuit device) 43 Digital multimeter (measurement circuit device) 51 Reference electrode 52 Luggin tube
Claims (1)
装置であって、 測定対象の金属を整形して得た複数個の試料試験片およ
び該各試料試験片を各別に保持して電気的に接続された
それぞれの各電極端子と、腐食作用を得る試料溶液を収
容した試験容器とを設け、前記試験容器の上方開口部に
前記各電極端子を配置すると共に、該各電極端子に保持
された前記各試料試験片を前記試料溶液中に浸漬させて
構成し、 前記複数個の電極端子または選択された各電極端子を介
し前記各試料試験片を測定回路装置に接続させて、前記
試料溶液への浸漬による任意時間経過中の各試料試験片
の腐食変化の状態および／または所定時間経過後の各試
料試験片の腐食程度を電気化学的測定法によって測定可
能とし、併せて、前記試料溶液による所定時間経過後の
各試料試験片の腐食に伴う重量減少ひいては腐食程度を
重量減少測定法によって測定可能とし、これらの各腐食
測定によって前記試料試験片の腐食速度を評価し得るよ
うにしたことを特徴とする金属材質の腐食測定装置。1. A corrosion measuring apparatus applied to the corrosion measurement of a metallic material, comprising a plurality of sample test pieces obtained by shaping a metal to be measured and each of the sample test pieces held separately and electrically. Each electrode terminal connected to, and a test container containing a sample solution that exerts a corrosive action are provided, and each electrode terminal is arranged in the upper opening of the test container and is held by each electrode terminal. Each of the sample test pieces is formed by immersing the sample solution in the sample solution, and the sample solution is connected to the measurement circuit device via the plurality of electrode terminals or each selected electrode terminal, It is possible to measure the state of corrosion change of each sample test piece during the lapse of an arbitrary time by immersion in water and / or the degree of corrosion of each sample test piece after the lapse of a predetermined time by an electrochemical measurement method. After a predetermined time It is characterized in that it is possible to measure the weight loss due to the corrosion of each subsequent sample test piece and thus the degree of corrosion by a weight loss measurement method, and to evaluate the corrosion rate of the sample test piece by each of these corrosion measurements. Corrosion measuring device for metallic materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8132675A JPH09297116A (en) | 1996-04-30 | 1996-04-30 | Corrosion measuring device for metallic material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8132675A JPH09297116A (en) | 1996-04-30 | 1996-04-30 | Corrosion measuring device for metallic material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09297116A true JPH09297116A (en) | 1997-11-18 |
Family
ID=15086882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8132675A Pending JPH09297116A (en) | 1996-04-30 | 1996-04-30 | Corrosion measuring device for metallic material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09297116A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007327787A (en) * | 2006-06-06 | 2007-12-20 | Fujitsu Ltd | Method of testing metal corrosiveness of insulating material |
| CN102830058A (en) * | 2012-09-04 | 2012-12-19 | 奥瑞金包装股份有限公司 | Metal can and electrochemical device for detecting corrosion strength of same |
| JP2015141171A (en) * | 2014-01-30 | 2015-08-03 | 三菱電機株式会社 | Moisture resistance evaluation method of electrode and evaluation device used for the same |
| KR20160077275A (en) * | 2014-12-22 | 2016-07-04 | 재단법인 포항산업과학연구원 | Method for manufacturing of sample for measuring corrosion rate of a metal |
-
1996
- 1996-04-30 JP JP8132675A patent/JPH09297116A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007327787A (en) * | 2006-06-06 | 2007-12-20 | Fujitsu Ltd | Method of testing metal corrosiveness of insulating material |
| CN102830058A (en) * | 2012-09-04 | 2012-12-19 | 奥瑞金包装股份有限公司 | Metal can and electrochemical device for detecting corrosion strength of same |
| JP2015141171A (en) * | 2014-01-30 | 2015-08-03 | 三菱電機株式会社 | Moisture resistance evaluation method of electrode and evaluation device used for the same |
| KR20160077275A (en) * | 2014-12-22 | 2016-07-04 | 재단법인 포항산업과학연구원 | Method for manufacturing of sample for measuring corrosion rate of a metal |
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