JPH059738B2 - - Google Patents
Info
- Publication number
- JPH059738B2 JPH059738B2 JP12091682A JP12091682A JPH059738B2 JP H059738 B2 JPH059738 B2 JP H059738B2 JP 12091682 A JP12091682 A JP 12091682A JP 12091682 A JP12091682 A JP 12091682A JP H059738 B2 JPH059738 B2 JP H059738B2
- Authority
- JP
- Japan
- Prior art keywords
- potential
- cooling water
- tube
- electrode body
- water pipe
- 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 - Lifetime
Links
- 239000000498 cooling water Substances 0.000 claims description 31
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 26
- 239000010936 titanium Substances 0.000 claims description 26
- 229910052719 titanium Inorganic materials 0.000 claims description 26
- 238000005260 corrosion Methods 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 14
- 239000011810 insulating material Substances 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 6
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 12
- 230000007797 corrosion Effects 0.000 description 8
- 238000005259 measurement Methods 0.000 description 7
- 229910000936 Naval brass Inorganic materials 0.000 description 5
- 238000004210 cathodic protection Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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
Description
【発明の詳細な説明】
この発明は、復水器等、各種熱交換器において
腐食を防止しなければならない冷却水管の電位及
びこれに流入する電流量をモニターするための電
極体およびその使用方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention provides an electrode body for monitoring the potential of cooling water pipes and the amount of current flowing therein, which must be prevented from corrosion in various heat exchangers such as condensers, and a method for using the same. It is related to.
例えば、火力発電所等のタービン系において冷
却水として海水を使用しなければならない場合、
復水器などの熱交換器の防食を完全にしないと操
業に重大な支障が生じる。 For example, when seawater must be used as cooling water in a turbine system such as a thermal power plant,
If heat exchangers such as condensers are not completely protected from corrosion, operations will be seriously disrupted.
従来、この種熱交換器の防食に電気防食法を採
用していることは周知のとおりである。 It is well known that the cathodic protection method has conventionally been used to protect this type of heat exchanger from corrosion.
熱交換器における電気防食は、管板や管板で支
持する冷却水管としての金属管の電位を測定し、
この測定結果に基づき、自動定電位式直流電源装
置から適正量の防食電流を供給する方式が一般的
に採用されている。 Cathodic protection in heat exchangers is carried out by measuring the potential of the tube sheet or the metal tube that serves as the cooling water tube supported by the tube sheet.
Based on this measurement result, a method is generally adopted in which an appropriate amount of anticorrosion current is supplied from an automatic potential constant DC power supply.
ところで、最近は復水器等の熱交換器が大形化
する傾向にあり、また、アンモニアアタツクを防
止する目的で、冷却水管に、管板材である銅合金
と材質が全く異る金属で、電位的にも貴なチタン
管（自然電位約＋0.05〜−0.15V）を使用するこ
とが一般化してきている。 By the way, heat exchangers such as condensers have recently become larger in size, and in order to prevent ammonia attack, cooling water pipes are made of a metal whose material is completely different from the copper alloy that makes up the pipe sheets. The use of potentially noble titanium tubes (natural potential of about +0.05 to -0.15V) has become common.
しかし、冷却水管に、チタン管を使用すると、
チタンよりも電位的に卑なネーバル黄銅等の銅合
金（自然電位約−0.18〜−0.3V）製の管板の腐食
が促進する。 However, if titanium pipes are used for cooling water pipes,
Corrosion of tube sheets made of copper alloys such as naval brass, which are more base in potential than titanium (natural potential approximately -0.18 to -0.3V), is accelerated.
ところで、管板に多数の管材を支持し、管板外
側の２つの水室を互いに連通させた水管式熱交換
器では、管材の交換は可能であつても管板の交換
は不可能であり、管板の交換はその熱交換器を完
全に解体することを意味する。 By the way, in a water tube heat exchanger in which a large number of tube materials are supported on a tube sheet and two water chambers on the outside of the tube sheet are communicated with each other, although it is possible to replace the tube materials, it is impossible to replace the tube sheet. , replacing the tubesheet means completely disassembling the heat exchanger.
このため、管板の防食には十分な防食電流を流
すが、過剰な防食電流の供給によつて、逆にチタ
ン管が水素脆化を起こしてしまうことが多くの研
究結果や実機の使用結果として報告されている。 For this reason, a sufficient anti-corrosion current is passed to prevent corrosion of the tube sheet, but many research results and actual machine usage results show that supplying an excessive anti-corrosion current can actually cause hydrogen embrittlement in titanium tubes. It is reported as.
これは、チタンが、電位−0.7Vよりも低い電
位（卑な電位）になると水素脆化を引起こすから
である。 This is because titanium causes hydrogen embrittlement when the potential is lower than -0.7V (base potential).
そこで、特に、チタン管を使用する熱交換器類
では、正確にチタン管の電位を測定し、常に適正
な防食電流を流すことが要求される。 Therefore, especially in heat exchangers using titanium tubes, it is required to accurately measure the potential of the titanium tubes and to always flow an appropriate anti-corrosion current.
ここで、従来の自動定電位制御式電気防食法に
ついて見ると、まず、被測定金属体である冷却水
管の取付位置に接近した管板面に基準電極を取付
けておくが、この基準電極やそのリード線が、冷
却水の乱流等により損傷を受けることなどにより
基準電極のリード線の絶縁被覆が損傷して、銅線
が直接冷却水に接触すると、銅電位（約−0.2V）
の影響により、測定値が不正確となるばかりか、
この測定結果に基づいて流される防食電流が自動
的に減少させられるので、チタン管に対して陽極
となるネーバル黄銅管板の防食を防ぐことができ
なくなつてしまう。 Looking at the conventional automatic constant potential control type cathodic protection method, first, a reference electrode is installed on the tube plate surface close to the installation position of the cooling water pipe, which is the metal object to be measured. If the insulation coating of the reference electrode lead wire is damaged due to the lead wire being damaged by turbulent flow of cooling water, etc., and the copper wire comes into direct contact with the cooling water, the copper potential (approximately -0.2V)
Not only will the measured values be inaccurate due to the influence of
Since the anticorrosion current applied is automatically reduced based on the measurement results, it becomes impossible to prevent corrosion of the naval brass tube sheet that serves as an anode for the titanium tube.
この場合リード線の損傷が発見されたとして
も、これを補修するには火力発電所のタービン系
を止めなければならないことからして、操業中の
補修や交換は一切不可能であり、その間は腐食の
進行を阻止することができない。 In this case, even if damage to the lead wire is discovered, repairing it would require stopping the turbine system of the thermal power plant, so it would be impossible to repair or replace it during operation; Unable to prevent corrosion from progressing.
また、基準電極は、チタン管を多数本取付けた
ネーバル黄銅製の管板に直接取付けられているの
でネーバル黄銅製の管板の自然電位−0.18〜−
0.3Vとチタン製の冷却水管の自然電位＋0.05〜−
0.15Vの合成電位（約−0.2V）を計測してしま
い、正確なチタン管の電位を測定することはでき
ない。 In addition, since the reference electrode is directly attached to a naval brass tube plate to which many titanium tubes are attached, the natural potential of the naval brass tube plate is -0.18 to -.
0.3V and the natural potential of the titanium cooling water pipe +0.05~-
The combined potential of 0.15V (approximately -0.2V) is measured, making it impossible to accurately measure the potential of the titanium tube.
この発明は、上述の観点に基づき、熱交換器の
冷却水管の防食電位のみならず防食電流をも正確
にモニターすることができるとともに交換も容易
な電極体およびその使用方法を提供するもので、
棒状基準電極と、前記棒状基準電極の一端を除い
て被覆する絶縁材層と、前記絶縁材層の外周を覆
う冷却水管と同材質でかつ管板材よりも電位が貴
な金属管と、前記金属管の外周に固着せしめたフ
ランジを有する絶縁材製ボビンとからなる熱交換
器の冷却水管の防食電位と防食電流とをモニター
するための電極体およびその使用方法に特徴を有
するものである。 Based on the above-mentioned viewpoints, the present invention provides an electrode body that can accurately monitor not only the anti-corrosion potential but also the anti-corrosion current of a cooling water pipe of a heat exchanger, and which is easy to replace, and a method for using the same.
a rod-shaped reference electrode, an insulating material layer covering the rod-shaped reference electrode except for one end, a metal tube made of the same material as the cooling water pipe and having a nobler potential than the tube sheet material and covering the outer periphery of the insulating material layer, and the metal tube. The present invention is characterized by an electrode body for monitoring the anti-corrosion potential and anti-corrosion current of a cooling water pipe of a heat exchanger, which comprises an insulating material bobbin having a flange fixed to the outer periphery of the pipe, and a method of using the electrode body.
つぎに、この発明の電極体およびその使用方法
を図面にもとづいて具体的に説明する。 Next, the electrode body of the present invention and its method of use will be specifically explained based on the drawings.
この発明の電極体の一例を第１図に一部切欠し
た断面図で示してあり、電極体１は棒状基準電極
１０と、棒状基準電極１０の一端を除いて被覆す
る絶縁材層９と、絶縁材層９の外周を覆うチタン
管７と、フランジ６Ａ付きボビン６とで構成され
ている。 An example of the electrode body of the present invention is shown in a partially cutaway cross-sectional view in FIG. 1, and the electrode body 1 includes a rod-shaped reference electrode 10, an insulating material layer 9 covering the rod-shaped reference electrode 10 except for one end, It is composed of a titanium tube 7 that covers the outer periphery of an insulating material layer 9 and a bobbin 6 with a flange 6A.
前記棒状基準電極１０は亜鉛棒が使用されるが
その他通常使用されている基準電極棒であるなら
ばいかなる材質のものでも使用可能である。 The rod-shaped reference electrode 10 is made of a zinc rod, but any other material that is commonly used as a reference electrode rod can be used.
また、絶縁材層９用の絶縁材としては、例えば
エポキシ樹脂が適する。 Furthermore, as the insulating material for the insulating material layer 9, for example, epoxy resin is suitable.
この電極体１は、熱交換器の１種である復水器
２の水室３を形成する水室カバー４に取付けた支
持フランジ５に取付けることができるようになつ
ている。そのためにフランジ６Ａを有する絶縁材
製のボビン６内にチタン管７を密に鋳込み成形し
固着してある。 This electrode body 1 can be attached to a support flange 5 attached to a water chamber cover 4 forming a water chamber 3 of a condenser 2, which is a type of heat exchanger. For this purpose, a titanium tube 7 is tightly cast and fixed in a bobbin 6 made of an insulating material and having a flange 6A.
基準電極１０の後端には真鋼製導電片１１を介
し、基準電極リード線１２を引出してある。 A reference electrode lead wire 12 is drawn out from the rear end of the reference electrode 10 via a conductive piece 11 made of true steel.
また、チタン管７の後端には電流計測用のリー
ド線１３と電位計測用のリード線１４をそれぞれ
外部に引出してある。 Further, at the rear end of the titanium tube 7, a lead wire 13 for current measurement and a lead wire 14 for potential measurement are each drawn out to the outside.
なお、水室カバー４への電極体１の取付けは、
ボビン６のフランジ６Ａにおけるテーパ面６ａに
環部材１５のテーバ面１５ａを当接し、ボルト１
６により固定するものとし、支持フランジ５と水
室カバー４の内面にはゴムライニング１７を施し
てある。 In addition, the installation of the electrode body 1 to the water chamber cover 4 is as follows.
The tapered surface 15a of the ring member 15 is brought into contact with the tapered surface 6a of the flange 6A of the bobbin 6, and the bolt 1
6, and a rubber lining 17 is provided on the inner surfaces of the support flange 5 and the water chamber cover 4.
第２図には、代表的な熱交換器の復水器２の断
面概略図と復水器２へ電極体１および不溶性電極
１８を取付けた状態を略示してあり、復水器２の
内部には管板２０が取付けられており、この管板
２０には冷却水管８が取付けられている。この冷
却水管８はチタン管である。 FIG. 2 shows a schematic cross-sectional view of a condenser 2 of a typical heat exchanger, a state in which the electrode body 1 and an insoluble electrode 18 are attached to the condenser 2, and the inside of the condenser 2. A tube plate 20 is attached to the tube plate 20, and a cooling water pipe 8 is attached to this tube plate 20. This cooling water pipe 8 is a titanium pipe.
電極体１は、水室カバー４の管板２０に最も近
い位置に管板２０に接触しないように第１図に示
した構造で取付けられる。 The electrode body 1 is attached to the water chamber cover 4 at a position closest to the tube plate 20 in the structure shown in FIG. 1 so as not to contact the tube plate 20.
一方、不溶性電極１８は所定数を水室カバー４
の蓋板１９に適宜絶縁及び水密構造で取付ける
が、その不溶性電極１８の数は多いほど水室３内
の電位分布が均一となり冷却水管８に均一に防食
電流を流すことができるが、実際には経済性を考
慮した複数個の適正な本数（例えば、４〜８本）
としている。 On the other hand, a predetermined number of insoluble electrodes 18 are connected to the water chamber cover 4.
The larger the number of insoluble electrodes 18, the more uniform the potential distribution in the water chamber 3, and the more uniform the anticorrosion current can be applied to the cooling water pipes 8. is an appropriate number of pieces considering economic efficiency (for example, 4 to 8 pieces)
It is said that
基準電極１０は基準電極リード線１２を介して
直流電圧（電位）計Ｖのプラス端子に接続し、ま
た、チタン管７は電位計測用のリード線１４を介
して前記直流電圧（電位）計Ｖのマイナス端子に
接続しておく。 The reference electrode 10 is connected to the positive terminal of the DC voltage (potential) meter V via a reference electrode lead wire 12, and the titanium tube 7 is connected to the positive terminal of the DC voltage (potential) meter V via a potential measurement lead wire 14. Connect it to the negative terminal of.
さらに、電流計測用のリード線１３は直流電流
計A1を介して復水器２の本体に接続しておく。
一方、自動定電位式直流電源装置Ｅの直流側プラ
ス端子はリード線を介して不溶性電極１８に接続
し、直流側マイナス端子は直流電流計A2を介し
て復水器２の本体に接続する。このようにリード
線を介して接続すると、前記直流電圧（電位）計
Ｖおよび直流電流計A1により基準電極１０の外
周を覆つているチタン管７の防食電位および防食
電流を測定することができ、この測定値にもとづ
いて自動定電位式直流電源装置Ｅから不溶性電極
１８に所要の直流電圧を印加し、不溶性電極１８
から電解質（熱交換器では海水、工業用水等）を
通してチタン製冷却水管８に所要の防食電流が供
給される。 Further, a lead wire 13 for current measurement is connected to the main body of the condenser 2 via a DC ammeter A1 .
On the other hand, the DC side positive terminal of the automatic potential constant DC power supply E is connected to the insoluble electrode 18 via a lead wire, and the DC side negative terminal is connected to the main body of the condenser 2 via a DC ammeter A2 . . When connected via lead wires in this way, the anticorrosive potential and anticorrosive current of the titanium tube 7 covering the outer periphery of the reference electrode 10 can be measured using the DC voltage (potential) meter V and the DC ammeter A1 . , Based on this measured value, a required DC voltage is applied to the insoluble electrode 18 from the automatic potential constant type DC power supply E, and the insoluble electrode 18
A required anticorrosion current is supplied from the titanium cooling water pipe 8 to the titanium cooling water pipe 8 through an electrolyte (sea water, industrial water, etc. in the case of a heat exchanger).
この場合、電極体１は管板２０に接近して取付
けられているために、冷却水管８と電極体１のチ
タン管７とは同電位となるので、電極体１のチタ
ン管７の防食電位と防食電流を測定することによ
り冷却管８の正確な防食電位と防食電流をモニタ
ーすることができるのである。なお、不溶性電極
１８と冷却水管８との距離は極めて遠距離である
ために、いずれの冷却水管８の防食電位及び防食
電流も均一な値となる。 In this case, since the electrode body 1 is installed close to the tube plate 20, the cooling water pipe 8 and the titanium tube 7 of the electrode body 1 are at the same potential, so the corrosion protection potential of the titanium tube 7 of the electrode body 1 is By measuring this and the anticorrosion current, it is possible to accurately monitor the anticorrosion potential and anticorrosion current of the cooling pipe 8. Note that since the distance between the insoluble electrode 18 and the cooling water pipe 8 is extremely long, the anticorrosion potential and anticorrosion current of all the cooling water pipes 8 have uniform values.
この測定結果から適正電位（SEC基準−0.5〜
−0.7V）の範囲内である約−0.6Vに設定するこ
とができる。 From this measurement result, the appropriate potential (SEC standard -0.5 ~
-0.7V) can be set to approximately -0.6V.
また、従来は、基準電極を管板２０に直接取付
けていたので、保守、点検、整備が非常に困難で
あつたが、この発明によると、電極体１を外側か
ら着脱自在に取付けられるので電極体の交換を容
易に行なうことができる。 Furthermore, in the past, the reference electrode was directly attached to the tube sheet 20, making maintenance, inspection, and maintenance extremely difficult. However, according to the present invention, the electrode body 1 can be detachably attached from the outside, so that the electrode body 1 can be detachably attached from the outside. You can easily exchange bodies.
第３図に示した電極体１は、棒状基準電極１０
の先端を所定寸法だけチタン管７の先端から突出
させてある点においてのみ前記第１図に示した電
極体１と異り、他は同じであるため第１図におけ
ると同じ部材、構造には同じ符号を付し、その説
明を省略する。 The electrode body 1 shown in FIG. 3 includes a rod-shaped reference electrode 10
It differs from the electrode body 1 shown in FIG. 1 only in that the tip of the titanium tube 7 is made to protrude from the tip of the titanium tube 7 by a predetermined distance. The same reference numerals are given and the explanation thereof will be omitted.
また、前記実施例において冷却水管８をチタン
管として説明したが、これを、アルミニウム黄銅
管、キユプロニツケル管、ステンレス鋼管その
他、管板材であるネーバル黄銅等よりも電位的に
貴な金属管のいずれにおいてもこの発明は適用さ
れ、その場合、電極体１の基準電極１０の外周を
冷却水管と同材質の金属管で覆えばよい。 In addition, although the cooling water pipe 8 has been described as a titanium pipe in the above embodiment, it may be made of an aluminum brass pipe, a Cypronickel pipe, a stainless steel pipe, or any metal pipe whose potential is more noble than the pipe sheet material such as naval brass. The present invention is also applicable, and in that case, the outer periphery of the reference electrode 10 of the electrode body 1 may be covered with a metal tube made of the same material as the cooling water tube.
以上の説明から明らかなように、この発明の電
極体を用いると、復水器等の熱交換器における冷
却水管の電位及びこれに流れる防食電流を、モニ
ターする電極体で常に正確に測定できるので、こ
の結果に基づき、自動定電位式直流電源装置から
供給する防食電流量を制御すれば、過剰な防食電
流が流れることによる冷却水管への悪影響を確実
に回避でき、また、モニターとなる電極体の交
換、保守、点検等に際しての操業停止時間を著し
く短減できるなど非常に優れた効果がもたらされ
る。 As is clear from the above explanation, when the electrode body of the present invention is used, the potential of the cooling water pipe in a heat exchanger such as a condenser and the anticorrosion current flowing therein can always be accurately measured using the monitoring electrode body. Based on this result, by controlling the amount of anti-corrosion current supplied from the automatic potential constant DC power supply, it is possible to reliably avoid the negative effects on the cooling water pipes due to the flow of excessive anti-corrosion current. This brings about extremely excellent effects, such as significantly reducing downtime during equipment replacement, maintenance, inspection, etc.
第１図はこの発明の電極体の一例を示す一部欠
除した側面図、第２図はこの発明の電極体および
不溶性電極を復水器に取付けた状態を説明する略
示縦断側面図、第３図はこの発明の電極体の変形
例を示す一部を欠除した側面図である。
図面において、１……電位電流検出器、２……
復水器、３……水室、４……水室カバー、５……
支持フランジ、６……ボビン、６Ａ……フラン
ジ、７……チタン管、８……冷却水管、１０……
基準電極、１２……基準電極リード線、１３，１
４……リード線、１８……不溶性電極、１９……
蓋板、２０……管板、Ｖ……電流電圧（電位）
計、A1……直流電流計、Ｅ……自動定電位式直
流電源装置、A2……直流電流計。
FIG. 1 is a partially cutaway side view showing an example of the electrode body of the present invention, and FIG. 2 is a schematic longitudinal sectional side view illustrating the state in which the electrode body and insoluble electrode of the present invention are attached to a condenser. FIG. 3 is a partially cutaway side view showing a modified example of the electrode body of the present invention. In the drawings, 1... potential current detector, 2...
Condenser, 3...Water chamber, 4...Water chamber cover, 5...
Support flange, 6... Bobbin, 6A... Flange, 7... Titanium pipe, 8... Cooling water pipe, 10...
Reference electrode, 12...Reference electrode lead wire, 13,1
4... Lead wire, 18... Insoluble electrode, 19...
Lid plate, 20...Tube plate, V...Current voltage (potential)
A1 ...DC ammeter, E...Automatic constant potential DC power supply, A2 ...DC ammeter.
Claims (1)
除いて被覆する絶縁材層と、前記絶縁材層の外周
を覆う冷却水管と同材質でかつ管板材よりも電位
が貴な金属管と、前記金属管の外周に固着せしめ
たフランジを有する絶縁材製ボビンとからなるこ
とを特徴とする熱交換器の冷却水管の防食電位と
防食電流をモニターするための電極体。 ２ 前記冷却水管と同材質でかつ管板材よりも電
位が貴な金属管はチタン管であることを特徴とす
る特許請求の範囲第１項記載の熱交換器の冷却水
管の防食電位と防食電流をモニターするための電
極体。 ３ 棒状基準電極と、前記棒状基準電極の一端を
除いて被覆する絶縁材層と、前記絶縁材層の外周
を覆う冷却水管と同材質でかつ管板材よりも電位
が貴な金属管と、前記金属管の外周に固着したフ
ランジを有する絶縁材製ボビンとからなる電極体
を、熱交換器の水室カバーの管板外周に最も近い
位置に管板に接触しないように着脱自在に取付け
て熱交換器の冷却水管の防食電位と防食電流をモ
ニターすること特徴とする電極体の使用方法。[Scope of Claims] 1. A rod-shaped reference electrode, an insulating material layer covering all but one end of the rod-shaped reference electrode, and a cooling water pipe covering the outer periphery of the insulating material layer, which are made of the same material and have a higher potential than the tube plate material. 1. An electrode body for monitoring anti-corrosion potential and anti-corrosion current of a cooling water pipe of a heat exchanger, characterized in that the electrode body comprises a metal tube and an insulating bobbin having a flange fixed to the outer periphery of the metal tube. 2. Corrosion-preventing potential and anti-corrosion current of a cooling water pipe of a heat exchanger according to claim 1, wherein the metal pipe made of the same material as the cooling water pipe and having a nobler potential than the tube sheet material is a titanium pipe. Electrode body for monitoring. 3. A rod-shaped reference electrode, an insulating material layer that covers the rod-shaped reference electrode except for one end, a metal tube that is made of the same material as the cooling water pipe and that has a nobler potential than the tube sheet material and that covers the outer periphery of the insulating material layer, and An electrode body consisting of an insulating material bobbin with a flange fixed to the outer periphery of a metal tube is removably attached to the water chamber cover of the heat exchanger at a position closest to the outer periphery of the tube plate without touching the tube plate. A method of using an electrode body characterized by monitoring the anti-corrosion potential and anti-corrosion current of a cooling water pipe of an exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12091682A JPS5912349A (en) | 1982-07-12 | 1982-07-12 | Measuring method of corrosion-proof potential current for heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12091682A JPS5912349A (en) | 1982-07-12 | 1982-07-12 | Measuring method of corrosion-proof potential current for heat exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5912349A JPS5912349A (en) | 1984-01-23 |
| JPH059738B2 true JPH059738B2 (en) | 1993-02-05 |
Family
ID=14798161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12091682A Granted JPS5912349A (en) | 1982-07-12 | 1982-07-12 | Measuring method of corrosion-proof potential current for heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5912349A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5187337B2 (en) * | 2010-03-29 | 2013-04-24 | 株式会社デンソー | Condensation sensor |
| JP2011209012A (en) * | 2010-03-29 | 2011-10-20 | Denso Corp | Condensation sensor |
-
1982
- 1982-07-12 JP JP12091682A patent/JPS5912349A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5912349A (en) | 1984-01-23 |
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