JPS644144B2 - - Google Patents
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- Publication number
- JPS644144B2 JPS644144B2 JP9178382A JP9178382A JPS644144B2 JP S644144 B2 JPS644144 B2 JP S644144B2 JP 9178382 A JP9178382 A JP 9178382A JP 9178382 A JP9178382 A JP 9178382A JP S644144 B2 JPS644144 B2 JP S644144B2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- soil
- corrosion
- measuring device
- probe
- 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.)
- Expired
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
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- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental & Geological Engineering (AREA)
- Environmental Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Description
【発明の詳細な説明】
本発明は土壌の腐食性を測定するための装置に
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for measuring the corrosivity of soil.
ガス、水道等の金属製導管類を土壌中に埋設す
る場合、この腐食防止対策が必要である。ガス導
管の腐食防止対策としては、防食電流を導管に流
す方法、導管をプラスチツク等の防食材で被覆す
る方法等が公知であるが、このような腐食防止対
策を行う場合、一番問題となるのは埋設土壌の腐
食性の問題である。即ち、土壌の腐食性は場所に
よつて非常に異なり、もし完全な腐食防止対策を
行うとなれば、埋設管路全般に亘つて土壌の腐食
性を測定し、これに適合した対策を採らなければ
ならない。 When burying metal conduits for gas, water, etc. in the soil, it is necessary to take measures to prevent corrosion. As measures to prevent corrosion of gas pipes, methods such as passing an anti-corrosion current through the pipes and coating the pipes with anti-corrosive material such as plastic are known, but when taking such corrosion prevention measures, the biggest problem is The problem is the corrosivity of the buried soil. In other words, the corrosiveness of soil varies greatly depending on the location, and if complete corrosion prevention measures are to be taken, the corrosiveness of the soil must be measured throughout the entire buried pipeline and appropriate countermeasures must be taken. Must be.
現在土壌の腐食性を判断する場合、土壌中の腐
食電位を測定する方法、土壌比抵抗を測定する方
法、腐食速度を測定する方法などがあり、これら
の方法は単独で或いは組み合わせて使用されてい
る。土壌の腐食性を判断する場合、最も好ましい
例は前記測定三方法全部を実施することである
が、前記のとおり管路全般に亘つてこの方法を実
施すると、その測定に大くの時間と労力を費やす
必要が生じてくる。又、このような三方法を実施
する場合、プローブが夫々異なるため、同一地点
で同時に三方法の値を求め、土壌の腐食性を判断
するということは不可能である。又、従来の測定
方法中土壌比抵抗を測定する場合、土壌杖とオー
ムメータとを併用し、オームメータからの発信音
をイヤホーンで聴き、この音が聴こえなくなつた
とき（このときブリツジ平衡が保たれる）のオー
ムメータの値を読み取つて土壌比抵抗を求めるも
のであることから、個人差の問題、熟練度の問
題、作業環境の問題等不確定要素が多く、信頼性
に欠ける問題がある。 Currently, there are methods to determine the corrosivity of soil, such as measuring the corrosion potential in the soil, measuring the soil resistivity, and measuring the corrosion rate.These methods are used alone or in combination. There is. When determining the corrosiveness of soil, the most preferable example is to perform all three measurement methods, but as mentioned above, if this method is applied to all pipes, the measurement will take a lot of time and effort. It becomes necessary to spend . Furthermore, when implementing these three methods, since the probes are different, it is impossible to determine the values of the three methods at the same time at the same point and judge the corrosiveness of the soil. In addition, when measuring soil resistivity using the conventional measurement method, a soil wand and an ohmmeter are used together, and the sound emitted from the ohmmeter is listened to through earphones, and when the sound is no longer audible (at this time, bridge equilibrium is Since soil resistivity is determined by reading the value of an ohmmeter (maintained), there are many uncertainties such as individual differences, skill levels, and working environment issues, resulting in unreliable problems. be.
本発明は斯かる点から、同一地点で同時に前記
三方法の測定を行うことができ、測定結果には高
度の信頼性が持たれ、然も時間的にも労力的にも
極めて経済的な測定装置を提案するのが目的であ
る。 From this point of view, the present invention enables measurement by the three methods described above at the same point at the same time, provides a high degree of reliability in the measurement results, and is extremely economical in terms of time and labor. The purpose is to propose a device.
斯かる目的のもとに提案される本発明の構成は
先端に軟鋼製の試料極を、この試料極の上部には
絶縁材を挾んで軟鋼製の対極を、更にこの対極の
上部には絶縁材を挾んで飽和硫酸銅溶液を満た
し、この溶液中に銅棒を浸漬すると共に飽和硫酸
銅溶液は液絡材を介して土壌と液絡するように構
成した銅−硫酸銅照合極を、一本の棒状に構成し
て成るプローブと、前記プローブの試料極と照合
極間の電位差を測定する腐食電位測定装置と、前
記プローブの試料極と対極間に高周波の定電流を
印加し、そのときの試料極の電位応答を銅−硫酸
銅照合極に対して測定する土壌比抵抗測定装置
と、前記プローブの試料極と対極間に低周波の定
電流を印加し、これにより求まるインピーダンス
から腐食反応抵抗を演算し、得られた値から鋼の
腐食速度を演算する鋼の腐食速度測定装置と、か
ら成るものである。 The configuration of the present invention proposed for this purpose includes a sample electrode made of mild steel at the tip, a counter electrode made of mild steel with an insulating material sandwiched between the sample electrode, and an insulating material placed above the counter electrode. A copper-copper sulfate reference electrode, which is constructed by sandwiching the wood and filling it with a saturated copper sulfate solution, immersing a copper rod in this solution and connecting the saturated copper sulfate solution to the soil via a junction material, is placed in one place. a corrosion potential measuring device that measures the potential difference between the sample electrode and the reference electrode of the probe; and a high-frequency constant current that is applied between the sample electrode and the counter electrode of the probe; A soil resistivity measurement device that measures the potential response of a sample electrode with respect to a copper-copper sulfate reference electrode, and a low-frequency constant current is applied between the sample electrode and the counter electrode of the probe, and the corrosion reaction is determined from the impedance determined by this. It consists of a steel corrosion rate measuring device that calculates the resistance and calculates the corrosion rate of the steel from the obtained value.
以下実施例図に基づいて本発明実施の一例を詳
記すると、第１図に於いて、１は棒状（杖状）の
プローブにして、このプローブ１は先端に位置し
た円錐状軟鋼製試料極２（表面積12.8cm2）と、こ
の試料極２の上部にテフロン（登録商標）製の絶
縁材４を挾んで構成した対極３と、この対極３の
上部にテフロン製の絶縁材９を挾んで構成した銅
−硫酸銅照合極５と、から成つている。銅−硫酸
銅照合極５は飽和硫酸銅溶液７中に銅棒（電極）
６を浸漬すると共に周囲に液絡材としてのラワン
材８を介して飽和硫酸銅溶液７が土壌と液絡する
ように構成してある。 An example of the implementation of the present invention will be described in detail below based on the embodiment drawings. In FIG. 2 (surface area 12.8 cm 2 ), a counter electrode 3 consisting of a Teflon (registered trademark) insulating material 4 sandwiched between the sample electrode 2 and a Teflon insulating material 9 sandwiched above the counter electrode 3. It consists of a copper-copper sulfate reference electrode 5. Copper-copper sulfate reference electrode 5 is a copper rod (electrode) in saturated copper sulfate solution 7.
6 is immersed in the soil, and a saturated copper sulfate solution 7 is connected to the soil via a lauan material 8 as a liquid connecting material.
１０は定電流電源にして、前記試料極２、対極
３、銅棒６とはライン１１，１２，１３を介して
夫々接続されている。 Reference numeral 10 denotes a constant current power source, which is connected to the sample electrode 2, counter electrode 3, and copper rod 6 via lines 11, 12, and 13, respectively.
１４は電位差計にして、試料極２と銅棒６とは
ライン１５，１６を介して接続されている。 14 is a potentiometer, and the sample electrode 2 and the copper rod 6 are connected via lines 15 and 16.
１７は土壌比抵抗測定装置にして、この装置に
於いては試料極２と対極３間に高周波の定電流を
印加し、そのときの試料極２の電位応答を銅−硫
酸銅照合極５に対して測定することにより土壌比
抵抗を求めるものである。 Reference numeral 17 denotes a soil resistivity measuring device, in which a high-frequency constant current is applied between the sample electrode 2 and the counter electrode 3, and the potential response of the sample electrode 2 at that time is transmitted to the copper-copper sulfate reference electrode 5. The soil resistivity is determined by measuring the soil resistance.
１８は腐食速度測定装置にして、前記プローブ
１の試料極２と対極３間に低周波の定電流パルス
を印加し、これにより求まるインピーダンスから
腐食反応抵抗を演算し、得られた値から鋼の腐食
速度を演算するものである。 18 is a corrosion rate measuring device, which applies a low frequency constant current pulse between the sample electrode 2 and counter electrode 3 of the probe 1, calculates the corrosion reaction resistance from the impedance found by this, and calculates the corrosion reaction resistance of the steel from the obtained value. This is to calculate the corrosion rate.
１９は関数発生器、２０はデジタル表示器にし
て、上記夫々の装置からのデータはこのデジタル
表示器によりデジタル表示される。なお、実施例
に於けるデジタル表示方式は切替え方式である
が、三つのデータを同時に表示する同時表示方式
であつてもよい。 19 is a function generator, 20 is a digital display, and the data from each of the above devices is digitally displayed by this digital display. Although the digital display method in the embodiment is a switching method, it may also be a simultaneous display method that displays three pieces of data at the same time.
本発明に係る装置は以上の如き構成から成り、
測定に際してはプローブ１を測定土壌中に埋め込
むか挿し込む。そして、先ず腐食電位を測定する
には測定チヤンネルを電位差計１４側に切り替
え、試料極２の銅−硫酸銅照合極５に対する電位
差を電位差計１４で読みとり、これをデジタル表
示器２０に表示する。 The device according to the present invention has the above configuration,
During measurement, the probe 1 is embedded or inserted into the soil to be measured. First, to measure the corrosion potential, the measurement channel is switched to the potentiometer 14 side, the potential difference between the sample electrode 2 and the copper-copper sulfate reference electrode 5 is read by the potentiometer 14, and this is displayed on the digital display 20.
次に土壌比抵抗を求めるには測定チヤンネルを
切り替え、試料極２と対極３との間に高周波の定
電流を印加し、そのときの試料極２の電位応答を
銅−硫酸銅照合極５に対して測定することにより
求める。具体的には、プローブを土壌中に埋め込
んだ直後の試料極２の腐食系を電気等価回路を用
いて表わすと第２図のようになる。測定チヤンネ
ルを比抵抗測定側にセツトすると、第１図に示す
関数発生器１９により試料極２と対極３との間に
高周波（1KHz）の正負対称な微小定電流が印加
される。第２図に於いて、コンデンサー成分であ
るCd1は高周波電流に対して抵抗がゼロとなるの
でCd1の両端が短絡されたことになりRs、すなわ
ち土壌抵抗が求まる。Rs（Ω）から比抵抗ρ（Ω
cm）を求めるにはつぎのようにする。あらかじめ
JISで規格化された比抵抗既知な溶液（たとえば
Ｎ／10KCl溶液）中にこのプローブを浸漬しRs
を測定する。いま用いたJIS規格の比抵抗をρと
するとRs／ρよりセルコンスタントＣ（cm-1）が
求まる。このセルコンスタントＣはプローブの幾
何学的形状で一義的に定まり、また高周波電流で
求められた土壌抵抗Rs（Ω）をRs／Ｃの演算によ
つて比抵抗ρ（Ωcm）に変換させるのに必要な値
である。比抵抗測定装置１７では、Rs／Ｃの演
算処理をくみ込み比抵抗ρ（Ωcm）を得、これが
デジタル表示器２０に表示される。 Next, to obtain the soil resistivity, switch the measurement channel, apply a high-frequency constant current between the sample electrode 2 and the counter electrode 3, and record the potential response of the sample electrode 2 at that time to the copper-copper sulfate reference electrode 5. It is determined by measuring against the Specifically, the corrosion system of the sample pole 2 immediately after the probe is embedded in the soil is shown in FIG. 2 using an electrical equivalent circuit. When the measurement channel is set to the resistivity measurement side, a small constant current of high frequency (1 KHz) with positive and negative symmetry is applied between the sample electrode 2 and the counter electrode 3 by the function generator 19 shown in FIG. In Figure 2, the capacitor component C d1 has zero resistance to high frequency current, so both ends of C d1 are shorted, so Rs, that is, the soil resistance can be found. From Rs (Ω) to specific resistance ρ (Ω
cm), do the following: in advance
Immerse this probe in a solution with a known resistivity standardized by JIS (for example, N/10KCl solution), and the
Measure. Letting ρ be the specific resistance of the JIS standard used just now, the cell constant C (cm -1 ) can be found from Rs/ρ. This cell constant C is uniquely determined by the geometrical shape of the probe, and the soil resistance Rs (Ω) determined by high-frequency current is converted into specific resistance ρ (Ωcm) by calculating Rs/C. This is the required value. The resistivity measuring device 17 incorporates the arithmetic processing of Rs/C to obtain the resistivity ρ (Ωcm), which is displayed on the digital display 20.
次に鋼の腐食速度を求めるには測定チヤンネル
を腐食速度側に切り替える。ところで、前記第２
図の腐食反応抵抗Rpは腐食速度に直接関係する
値である。すなわち、Rpが小さいほど腐食速度
が大きくなる。そこで、本発明の場合には鋼の腐
食速度ｄはRpの測定値から、この値をもとに腐
食速度測定装置１８にて演算処理し、これをデジ
タル表示器２０に表示している。 Next, to determine the corrosion rate of steel, switch the measurement channel to the corrosion rate side. By the way, the second
The corrosion reaction resistance Rp in the figure is a value directly related to the corrosion rate. That is, the smaller Rp is, the higher the corrosion rate is. Therefore, in the case of the present invention, the corrosion rate d of steel is calculated from the measured value of Rp by the corrosion rate measuring device 18 based on this value, and this is displayed on the digital display 20.
更に詳しく実施例の測定法を説明すると、測定
チヤンネルをセツトすると、第１図に示す関数発
生器１９により、プローブ１の試料極２と対極３
との間に低周波（0.01Hz）の正負対称な微小定電
流が印加される。このときコンデンサー成分であ
るCd1は低周波電流に対して抵抗が無限大となる
ので電位応答よりRp＋Rsが求まる。つぎに第１
図に示すように先に比抵抗の測定で求まつたRs
の値を減算器で処理させることによりRpが求ま
る。このRpはプローブ１先端の軟鋼（試料極２）
の腐食反応抵抗であるが、いかにしてRp（Ω）か
ら腐食速度ｄ（mm／yr）に変換するかが問題とな
る。本発明の場合、過去約１年間にわたりできる
だけ広範に軟鋼を種々のタイプの土壌中に埋設し
た試験結果からRpの値にプローブ１の試料極２
の表面積12.8cm2を乗じ、ｄ（mm／yr）＝
6310／（12.8Rp）15の演算から鋼の腐食速度を求めるの
が妥当であると判断し、これをデジタル表示器２
０に表示するようにしている。 To explain the measurement method of the embodiment in more detail, when the measurement channel is set, the function generator 19 shown in FIG.
A low-frequency (0.01Hz) minute constant current with positive and negative symmetry is applied between the two. At this time, since the capacitor component C d1 has infinite resistance against low frequency current, Rp + Rs can be found from the potential response. Next, the first
As shown in the figure, Rs obtained by measuring the specific resistance
Rp is found by processing the value of with a subtracter. This Rp is the mild steel at the tip of probe 1 (sample pole 2)
The problem is how to convert Rp (Ω) to corrosion rate d (mm/yr). In the case of the present invention, the value of Rp was determined from test results in which mild steel was buried as widely as possible in various types of soil over the past approximately one year.
Multiply by the surface area of 12.8 cm 2 , d (mm/yr) =
6310/(12.8Rp) It was determined that it was appropriate to obtain the corrosion rate of steel from the calculation in step 15 , and this was calculated on the digital display 2.
I am trying to display it as 0.
本発明は以上のように試料極２及び対極３並び
に銅−硫酸銅照合極５を一本のプローブ１にまと
め、このプローブ１を測定土壌中に埋め込んで同
一ポイントでの腐食電位、比抵抗、腐食速度を同
時に求めることができるので、土壌腐食性を能率
よく、正確に測定することができる。 As described above, the present invention combines the sample electrode 2, the counter electrode 3, and the copper-copper sulfate reference electrode 5 into one probe 1, and embeds this probe 1 in the soil to be measured. Since the corrosion rate can be determined at the same time, soil corrosivity can be measured efficiently and accurately.
次に、一本のプローブ１を用い、各データを
夫々の測定装置に於いて演算処理し、これをデジ
タル表示器２０に表示するものであるから、従来
のように測定値に個人差、測定環境条件差があら
われる心配がなく、又測定に熟練を要するという
ことも特にない。 Next, using one probe 1, each data is processed in each measuring device and displayed on the digital display 20, so there is no possibility of individual differences and measurement differences in the measured values as in the past. There is no need to worry about differences in environmental conditions, and no special skill is required for measurement.
第１図は本発明の実施例を示す装置の概略図、
第２図は試料極と対極間に高周波定電流を印加し
ているときの電気等価回路図である。
１……プローブ、２……試料極、３……対極、
４，９……絶縁材、５……銅−硫酸銅照合極、７
……銅棒、１０……定電流電源、１４……電位差
計、１７……比抵抗測定装置、１８……腐食速度
測定装置、１９……関数発生器、２０……デジタ
ル表示器。
FIG. 1 is a schematic diagram of an apparatus showing an embodiment of the present invention;
FIG. 2 is an electrical equivalent circuit diagram when a high frequency constant current is applied between the sample electrode and the counter electrode. 1...Probe, 2...Sample electrode, 3...Counter electrode,
4, 9...Insulating material, 5...Copper-copper sulfate reference electrode, 7
...Copper rod, 10... Constant current power source, 14... Potentiometer, 17... Specific resistance measuring device, 18... Corrosion rate measuring device, 19... Function generator, 20... Digital display.
Claims (1)
には絶縁材を挟んで軟鋼製の対極を、更にこの対
極の上部には絶縁材を挟んで飽和硫酸銅溶液を満
たし、この溶液中に銅棒を浸漬すると共に飽和硫
酸銅溶液は液絡材を介して土壌と液絡するように
構成した銅−硫酸銅照合極を、一本の棒状に構成
して成るプロープと、 前記プロープの試料極と照合極間の電位差を測
定する腐食電位測定装置と、 前記プロープの試料極と対極間に高周波の定電
流を印加し、そのときの試料極の電位応答を銅−
硫酸銅照合極に対して測定する土壌比抵抗測定装
置と、 前記プロープの試料極と対極間に低周波の定電
流を印加し、これにより求まるインピーダンスか
ら腐食反応抵抗を演算し、得られた値から鋼の腐
食速度を演算する鋼の腐食速度測定装置と、 から成る土壌腐食測定装置。[Claims] 1. A sample electrode made of mild steel at the tip, a counter electrode made of mild steel with an insulating material sandwiched between the sample electrode, and a saturated copper sulfate solution placed on the top of this counter electrode with an insulating material sandwiched therebetween. A copper-copper sulfate reference electrode is constructed in the form of a single rod, and the copper rod is immersed in this solution, and the saturated copper sulfate solution is connected to the soil via a liquid junction material. a corrosion potential measuring device for measuring the potential difference between a sample electrode and a reference electrode of the probe; a high-frequency constant current applied between the sample electrode and the counter electrode of the probe; −
A low-frequency constant current is applied between the soil resistivity measuring device that measures against the copper sulfate reference electrode, and the sample electrode and counter electrode of the probe, and the corrosion reaction resistance is calculated from the impedance found by this, and the value obtained is A soil corrosion measuring device consisting of a steel corrosion rate measuring device that calculates the corrosion rate of steel from , and a soil corrosion measuring device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9178382A JPS58208654A (en) | 1982-05-28 | 1982-05-28 | Apparatus for measuring corrosion in soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9178382A JPS58208654A (en) | 1982-05-28 | 1982-05-28 | Apparatus for measuring corrosion in soil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58208654A JPS58208654A (en) | 1983-12-05 |
| JPS644144B2 true JPS644144B2 (en) | 1989-01-24 |
Family
ID=14036188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9178382A Granted JPS58208654A (en) | 1982-05-28 | 1982-05-28 | Apparatus for measuring corrosion in soil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58208654A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998339A (en) * | 2012-12-03 | 2013-03-27 | 太原理工大学 | Indoor compaction soil corrosivity evaluation device and using method thereof |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS637352U (en) * | 1986-07-02 | 1988-01-19 | ||
| JP3632877B2 (en) * | 1997-02-21 | 2005-03-23 | 東京瓦斯株式会社 | AC corrosion degree measuring method and apparatus under natural potential and cathodic protection |
| JP6370701B2 (en) * | 2014-12-17 | 2018-08-08 | 株式会社ベンチャー・アカデミア | Soil corrosion evaluation method |
| ITUB20154873A1 (en) * | 2015-10-29 | 2017-04-29 | Cescor Srl | NEW PROBE FOR THE PERFORMANCE OF RESISTIVITY MEASUREMENTS IN THE INSPECTION OF SUBMARINE CONDUCT AND THE VERIFICATION OF THEIR STATUS OF CATHODIC PROTECTION AND FURTHER INNOVATIONS IN THE FIELD OF INSPECTION OF SUBMARINE CONDUCT |
| DK3163288T3 (en) * | 2015-10-29 | 2018-11-12 | Cescor Srl | New probes and devices for the inspection of cathodic protection of subsea pipelines |
-
1982
- 1982-05-28 JP JP9178382A patent/JPS58208654A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998339A (en) * | 2012-12-03 | 2013-03-27 | 太原理工大学 | Indoor compaction soil corrosivity evaluation device and using method thereof |
| CN102998339B (en) * | 2012-12-03 | 2014-10-22 | 太原理工大学 | Indoor compaction soil corrosivity evaluation device and using method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58208654A (en) | 1983-12-05 |
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