JPH0250198B2 - - Google Patents
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- Publication number
- JPH0250198B2 JPH0250198B2 JP57175679A JP17567982A JPH0250198B2 JP H0250198 B2 JPH0250198 B2 JP H0250198B2 JP 57175679 A JP57175679 A JP 57175679A JP 17567982 A JP17567982 A JP 17567982A JP H0250198 B2 JPH0250198 B2 JP H0250198B2
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- JP
- Japan
- Prior art keywords
- iron
- electrode
- electrolytic
- electrodes
- protection method
- 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
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- Preventing Corrosion Or Incrustation Of Metals (AREA)
Description
【発明の詳細な説明】
本発明は冷却水として海水を使用する発電プラ
ント等の海水使用機器における銅合金部材の腐食
を防止する鉄電解防食方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an iron electrolytic corrosion protection method for preventing corrosion of copper alloy members in seawater-using equipment such as power plants that use seawater as cooling water.
発電プラントの復水器等の海水使用機器におけ
るアルミニウム黄銅管のような銅合金部材の腐食
を防止する手段として、従来の硫酸第一鉄溶液を
冷却水中に添加する防食法に代つて、最近では鉄
材を電解することによつて溶出する鉄イオンを冷
却水中に供給して銅合金部材表面に安定な防食性
酸化鉄皮膜を形成させる防食法が一般に行われて
いる。 As a means of preventing corrosion of copper alloy parts such as aluminum brass pipes in seawater-using equipment such as condensers of power plants, recently, instead of the conventional corrosion prevention method of adding ferrous sulfate solution to cooling water, A corrosion prevention method is generally practiced in which iron ions eluted by electrolyzing an iron material are supplied into cooling water to form a stable corrosion-resistant iron oxide film on the surface of a copper alloy member.
このような鉄電解防食法においては、初期皮膜
形成時と、安定皮膜形成後の皮膜維持時とにおけ
る鉄イオン濃度を異ならしめるのが好ましい。す
なわち、初期皮膜形成時においては比較的大量の
鉄イオンを供給することが必要であるが、安定皮
膜形成後にはこれら皮膜形成時よりも少量の鉄イ
オンを供給すれば足り、換言すれば冷却水中に供
給される鉄イオン濃度は低くても安定皮膜が維持
し得るものである。 In such an iron electrolytic corrosion protection method, it is preferable to make the iron ion concentration different during initial film formation and during film maintenance after stable film formation. In other words, it is necessary to supply a relatively large amount of iron ions during the initial film formation, but after the stable film is formed, it is sufficient to supply a smaller amount of iron ions than during the film formation. A stable film can be maintained even if the iron ion concentration supplied is low.
このようなことから、本発明の出願人らは、初
期に大量の鉄イオンを供給するための電解式鉄イ
オン発生装置を冷却水取水路中に設置し、それと
ともに熱交換器の水入口側水室内に皮膜維持に必
要な少量の鉄イオンを供給するための溶解性鉄電
極装置を別途に設置し、冷却管の防食皮膜の形成
状態に応じてこれら別途に設置した鉄イオン発生
装置を作動させるようにした熱交換器の防食方法
を提案し、出願した（特開昭55−23857号）。 For this reason, the applicants of the present invention installed an electrolytic iron ion generator in the cooling water intake channel to initially supply a large amount of iron ions, and at the same time installed an electrolytic iron ion generator at the water inlet of the heat exchanger. A soluble iron electrode device is installed separately in the water chamber to supply a small amount of iron ions necessary to maintain the film, and the separately installed iron ion generator is activated depending on the state of the anti-corrosion film formation on the cooling pipe. He proposed and filed an application for a method for preventing corrosion of heat exchangers (Japanese Patent Laid-Open No. 55-23857).
しかしながら、鉄イオン発生装置を用途に応じ
て複数基設置することは設置の費用、手数のみな
らず、保守管理等において明らかに不利とならざ
るを得ない。 However, installing a plurality of iron ion generators depending on the purpose is clearly disadvantageous not only in terms of installation cost and labor, but also in terms of maintenance and management.
本発明は一基の鉄イオン発生装置により初期皮
膜形成時および安定皮膜維持時の各場合に応じ得
る鉄電解防食法を提供することを目的とするもの
である。 The object of the present invention is to provide an iron electrolytic corrosion protection method that can be applied to both initial film formation and stable film maintenance using a single iron ion generator.
一般に鉄イオンを冷却水中に供給して海水使用
機器における銅合金部材表面に酸化鉄皮膜を形成
するに際し、初期皮膜形成時に必要とされる鉄イ
オン濃度は0.01〜0.5ppm程度であり、また安定
皮膜形成後には0.001〜0.01ppm程度の鉄イオン
濃度でこれら安定皮膜が充分に維持されるもので
ある。 Generally, when iron ions are supplied into cooling water to form an iron oxide film on the surface of a copper alloy member in equipment using seawater, the iron ion concentration required at the initial stage of film formation is approximately 0.01 to 0.5 ppm, and a stable film is required. After formation, these stable films are sufficiently maintained at an iron ion concentration of about 0.001 to 0.01 ppm.
今、一基の鉄イオン発生装置により、上記した
初期皮膜形成に必要な鉄イオン濃度範囲の比較的
大量の鉄イオンを冷却水中に供給して安定な防食
皮膜を形成した後、鉄イオン発生装置の出力を低
下させて安定皮膜維持のために少量の鉄イオンを
供給する場合、鉄電極の電流密度は必然的に低下
する。 Now, after forming a stable anti-corrosion film by supplying a relatively large amount of iron ions in the iron ion concentration range necessary for the above-mentioned initial film formation into the cooling water using one iron ion generator, the iron ion generator If a small amount of iron ions are supplied to maintain a stable film by reducing the output of the iron electrode, the current density of the iron electrode will inevitably decrease.
本発明者らはこのような低電流密度で電解を続
けたところ、陰極面で付着生成するMg（OH）2＋
CaCO3からなるスケールのうち緻密なCaCO3の
割合が多くなり、これが陰極面に堆積して電解効
率を低下させるとともに長期に亘る安定した鉄イ
オン供給を行うことが困難となることを見出し
た。そして、これら低電流密度とすることによる
問題点を克服するために種々検討したところ、上
記問題点を生じない適正な範囲の電解電流密度で
鉄イオン濃度を所望値に減少させ得るためには鉄
電流表面の一部を頂部に平板状部を有する断面Ｔ
字型の遮弊材を使用すればよく、これにより効果
的な電解特性が得られることを見出した。 When the present inventors continued electrolysis at such a low current density, Mg(OH) 2 + deposited and generated on the cathode surface.
It was found that the proportion of dense CaCO 3 in the scale consisting of CaCO 3 increases, and this deposits on the cathode surface, lowering the electrolytic efficiency and making it difficult to stably supply iron ions over a long period of time. In order to overcome the problems caused by using a low current density, we conducted various studies and found that in order to reduce the iron ion concentration to the desired value at an appropriate electrolytic current density that does not cause the above problems, we found that A cross section T with a flat plate-like part on top of a part of the current surface
It has been found that effective electrolytic properties can be obtained by using a shape-shaped shielding material.
本発明はこれら知見に基づいてなされたもので
あり、防食皮膜の生成状態に応じて効果的な電解
効率により常に適正な量の鉄イオンを供給するこ
とにより海水使用機器における銅合金部材の防食
を図るものである。 The present invention was made based on these findings, and aims to prevent corrosion of copper alloy members in equipment using seawater by constantly supplying an appropriate amount of iron ions with effective electrolytic efficiency depending on the state of formation of an anticorrosive film. This is what we aim to do.
すなわち本発明は板状の鉄電極を適宜な間隔を
おいて積層し、これら鉄電極群に直流電流を通電
して発生した鉄イオンを海水中に供給し、海水使
用機器の銅合金部材表面に防食皮膜を形成する鉄
電解防食方法において、比較的高濃度の鉄イオン
を供給して前記部材表面に安定防食皮膜を形成し
た後、この防食皮膜を低濃度の鉄イオンの供給に
より維持するに際し、前記電極表面の一部を頂部
に平板状部を有する断面Ｔ字型に形成した遮弊材
の平板状部により電極間隔の一部を閉鎖するとと
もに垂下部により電極の一部を遮弊することによ
つて電極の電解電流密度を常に適正な範囲に維持
するようにすることを特徴とするものである。 In other words, the present invention stacks plate-shaped iron electrodes at appropriate intervals, supplies iron ions generated by passing a direct current through these iron electrodes into seawater, and deposits them on the surface of copper alloy members of equipment using seawater. In an iron electrolytic corrosion protection method for forming an anti-corrosion film, after a relatively high concentration of iron ions is supplied to form a stable anti-corrosion film on the surface of the member, when this anti-corrosion film is maintained by supplying a low concentration of iron ions, A part of the electrode interval is closed by a flat plate-shaped part of the shielding material formed in a T-shaped cross section with a flat plate-shaped part at the top of a part of the electrode surface, and a part of the electrode is shielded by the hanging part. This feature is characterized in that the electrolytic current density of the electrode is always maintained within an appropriate range.
本発明において、遮弊材は電気絶縁性の板状体
例えば塩化ビニル樹脂、ポリエチレン樹脂、ポリ
プロピレン樹脂、ポリスチレン樹脂、ポリエステ
ル樹脂等の合成樹脂により板状体に成形するのが
好ましい。これら鉄電極の一部遮弊を行う場合、
遮弊部分の表面積は遮弊しない場合の電極有効表
面積の1/2未満では遮弊表面積が小さくなるにつ
れて遮弊材の遮弊位置を移動させる頻度が多くな
るので管理上繁雑になり、また遮弊部分の表面積
が遮弊しない場合の電極有効表面積の1/2を越え
るにつれて鉄電極の溶解残りが多くなつて不経済
になるので、鉄電極表面の遮弊部分は遮弊しない
場合の鉄電極有効表面積の1/2程度とするのが最
適である。 In the present invention, it is preferable that the shielding material is formed into an electrically insulating plate-shaped body using a synthetic resin such as vinyl chloride resin, polyethylene resin, polypropylene resin, polystyrene resin, or polyester resin. When partially shielding these iron electrodes,
If the surface area of the shielding part is less than 1/2 of the effective surface area of the electrode without shielding, as the shielding surface area decreases, the shielding position of the shielding material will have to be moved more frequently, which will make management complicated, and As the surface area of the iron electrode exceeds 1/2 of the effective surface area of the electrode without shielding, the amount of undissolved iron electrode increases and becomes uneconomical. It is optimal to set it to about 1/2 of the effective surface area.
本発明において、遮弊材はその頂部、すなわち
冷却水入口側端部に対応する部分に平板状部を有
する断面Ｔ字型に形成し、このような遮弊材によ
り電極間〓の一部を閉鎖するように設置してある
から、電極間の冷却水流速が大きくなり、陰極ス
ケールの離脱及び電極面における電解作用の安定
化が図れることになり、鉄イオン発生効率の向上
も期待できるので長期連続運用上極めて好ましい
効果が得られる。 In the present invention, the shielding material is formed into a T-shaped cross section with a flat plate portion at its top, that is, the portion corresponding to the end on the cooling water inlet side, and the shielding material partially blocks the gap between the electrodes. Because it is installed in a closed manner, the flow rate of cooling water between the electrodes increases, allowing the removal of cathode scale and stabilizing the electrolytic action on the electrode surface, which can also be expected to improve iron ion generation efficiency, so it can be used for a long time. Extremely favorable effects can be obtained in continuous operation.
このような遮弊材による鉄電極表面の一部遮弊
により、初期皮膜形成時および安定皮膜維持時に
おける電解電流密度を適正な範囲、すなわち10〜
500A／m2に維持することが可能となる。 By partially shielding the surface of the iron electrode with such shielding material, the electrolytic current density during initial film formation and stable film maintenance can be kept within an appropriate range, that is, 10~
It becomes possible to maintain the current at 500A/ m2 .
なお、本発明では皮膜の生成状態に拘らず、一
基の鉄イオン発生装置を設置し、この装置により
溶出した鉄イオンを冷却水中に供給するものであ
り、従つてこの鉄イオン発生装置は被防食皮膜形
成部材である銅合金部材よりも上流側の例えば冷
却水取水路中に没水設置し、あるいは取水路と分
枝させた管路途中に設けられた電解槽内に設置し
てもよい。しかし、初期皮膜形成後に鉄電極表面
の一部を一旦遮弊すれば、通常そのまま安定皮膜
維持を長期に亘つて継続的に行えばよいが、初期
皮膜形成後の遮弊材の取付けを容易にするために
は、鉄イオン発生装置は取水路の分枝管途中の電
解槽内に設けることが好ましい。 In addition, in the present invention, regardless of the state of film formation, one iron ion generator is installed and the iron ions eluted by this device are supplied to the cooling water. It may be installed submerged in the cooling water intake channel, for example, on the upstream side of the copper alloy member that is the anticorrosion film forming member, or it may be installed in an electrolytic cell provided in the middle of a pipe branching from the intake channel. . However, once a part of the iron electrode surface is shielded after the initial film is formed, it is usually sufficient to maintain a stable film continuously over a long period of time. In order to achieve this, it is preferable to install the iron ion generator in an electrolytic cell in the middle of a branch pipe of the intake channel.
第１図は鉄イオン発生装置を電解槽内に設置
し、鉄電極に遮弊材を取付けた場合の部分平面図
であり、第２図および第３図はそれぞれ第１図の
Ａ−Ａ断面図およびＢ−Ｂ断面図である。図にお
いて、鉄電極２は適宜の間隔をもつて複数枚積層
されて鉄電極群を構成し、この鉄電極２の側端部
には断面コ字状の縦溝を有する１対のFRP等の
絶縁性合成樹脂板１が所定の間隔で且つ平行に配
置され、この絶縁性合成樹脂板１の縦溝に鉄電極
２の側端部に嵌合されている。これら鉄電極２は
２個の不溶性の帯状結線材３によつてボルトで並
列に接続され、これら結線材３はそれぞれ図示し
ていない外部の自動極性変換器付の直流電源装置
に接続されている。そして、これら２個の結線材
３により隣り合う鉄電極２が交互に結線されるこ
とにより、一方の鉄電極２が陽極とされる場合に
はその鉄電極２と隣り合う鉄電極２が陰極とな
り、これらが交互に陽極および陰極に切り換わる
ようになつている。 Figure 1 is a partial plan view when the iron ion generator is installed in an electrolytic cell and a shielding material is attached to the iron electrode, and Figures 2 and 3 are cross sections A-A in Figure 1. It is a figure and a BB sectional view. In the figure, a plurality of iron electrodes 2 are laminated at appropriate intervals to form an iron electrode group, and the side ends of the iron electrodes 2 are made of a pair of FRP or the like having vertical grooves with a U-shaped cross section. Insulating synthetic resin plates 1 are arranged parallel to each other at predetermined intervals, and the side ends of the iron electrodes 2 are fitted into the vertical grooves of the insulating synthetic resin plates 1. These iron electrodes 2 are connected in parallel with bolts by two insoluble strip-shaped wire connections 3, and each of these wire connections 3 is connected to an external DC power supply device with an automatic polarity converter (not shown). . Adjacent iron electrodes 2 are alternately connected by these two connecting materials 3, so that when one iron electrode 2 is used as an anode, the iron electrode 2 adjacent to that iron electrode 2 becomes a cathode. , these are arranged to alternately switch to an anode and a cathode.
このような鉄電極２の表面の一部にはPVC等
の合成樹脂で形成した絶縁性の遮弊材４がボルト
５により取り付けられている。この遮弊材４によ
り鉄電極２の表面の一部が遮弊され、鉄電極２か
らの鉄イオンの溶出が抑制され、電解電流密度が
所定範囲にされつつ冷却水中に供給される鉄イオ
ン濃度が低くなる。この遮弊材４の冷却水入口側
端部に当接する部分には平板状部６が設けられ、
この平板状部６は遮弊材４と同材料で、好ましく
は一体に形成され、遮弊材が平板状部６を有する
断面Ｔ字型とされている。そしてこの平板状部６
により電極間〓を部分的に閉鎖することにより電
極間の有効電極面の冷却水流速度が大きくなる。 An insulating shielding material 4 made of synthetic resin such as PVC is attached to a part of the surface of the iron electrode 2 with bolts 5. This shielding material 4 shields a part of the surface of the iron electrode 2, suppresses the elution of iron ions from the iron electrode 2, and keeps the electrolytic current density within a predetermined range, while the iron ion concentration is supplied into the cooling water. becomes lower. A flat plate-shaped portion 6 is provided at a portion of the shielding material 4 that comes into contact with the end portion on the cooling water inlet side.
The flat plate-shaped portion 6 is made of the same material as the shielding member 4, and is preferably integrally formed, and the shielding member has a T-shaped cross section with the flat plate-shaped portion 6. And this flat part 6
By partially closing the space between the electrodes, the cooling water flow velocity on the effective electrode surface between the electrodes is increased.
なお、上述のようた鉄電極群からなる鉄イオン
発生装置は冷却水としての海水が第２図および第
３図の上方から下方に通流するように設置する
が、図示した位置関係は電解槽内に鉄電極群を設
ける場合であり、冷却水の取水路中に没水設置す
る場合には第２図および第３図の上方が取水路の
上流側に位置するように鉄電極群を横向きに設置
すればよい。 Note that the iron ion generator consisting of the iron electrode group described above is installed so that the seawater as cooling water flows from the top to the bottom in Figures 2 and 3, but the illustrated positional relationship is that of the electrolytic tank. If the iron electrode group is installed inside the cooling water intake channel, and if it is installed submerged in the cooling water intake channel, the iron electrode group should be oriented horizontally so that the upper part of Figures 2 and 3 is located on the upstream side of the intake channel. It should be installed in .
次に、このような鉄電極群を設けた電解槽およ
びモデルコンデンサを使用した実施例を示す。 Next, an example using an electrolytic cell provided with such an iron electrode group and a model capacitor will be shown.
実施例
鉄電極に遮弊材を設けない状態で電解し、
0.03ppmの鉄イオン濃度の海水を30日間供給して
アルミニウム黄銅管内面に防食性の酸化鉄皮膜を
形成した。このときの電解電流値は150A、電極
の電流密度は500A／m2であつた。Example Electrolysis is carried out without a shielding material on the iron electrode,
Seawater with an iron ion concentration of 0.03 ppm was supplied for 30 days to form an anticorrosive iron oxide film on the inner surface of the aluminum brass tube. The electrolytic current value at this time was 150 A, and the current density of the electrode was 500 A/m 2 .
その後、図示されるように平板状部を有する遮
弊材により鉄電極の有効表面積の1/2を遮弊する
とともに鉄イオン濃度を0.003ppmに落して通電
を300日間続けた。このときの電解電流値は15A、
電極の電流密度は100A／m2、また遮弊材の移動
頻度は１回であつた。 Thereafter, as shown in the figure, 1/2 of the effective surface area of the iron electrode was shielded by a shielding material having a flat plate-like portion, and the iron ion concentration was lowered to 0.003 ppm, and electricity was continued for 300 days. The electrolytic current value at this time is 15A,
The current density of the electrode was 100 A/m 2 , and the frequency of movement of the shielding material was once.
試験後、電解槽を開放して内部点検した結果、
電解スケールの付着および堆積はほとんど認めら
れず、また各電極有効部の消耗状況はいずれも均
一で滑らかな消耗状態を示し、電流効率も平均90
％以上と極めて良好であつた。また、コンデンサ
内面には良質の鉄皮膜の形成が認められるととも
に熱貫流率の低下も平均10％程度とわずかであつ
た。 After the test, we opened the electrolytic cell and inspected the inside, and found that
Almost no electrolytic scale adhesion or accumulation was observed, and the wear status of the effective parts of each electrode was uniform and smooth, and the current efficiency was 90% on average.
% or more, which was extremely good. In addition, the formation of a high-quality iron film on the inner surface of the capacitor was observed, and the decrease in heat transmission coefficient was slight, averaging about 10%.
第１図は鉄イオン発生装置を電解槽内に設置
し、鉄電極に遮弊材を取付けた場合の部分平面図
であり、第２図および第３図はそれぞれ第１図の
Ａ−Ａ断面図およびＢ−Ｂ断面図である。
１……絶縁性合成樹脂板、２……鉄電極、３…
…帯状結線材、４……遮弊材、５……ボルト、６
……平板状部。
Figure 1 is a partial plan view when the iron ion generator is installed in an electrolytic cell and a shielding material is attached to the iron electrode, and Figures 2 and 3 are cross sections taken along line A-A in Figure 1. FIG. 2 is a diagram and a BB sectional view. 1... Insulating synthetic resin plate, 2... Iron electrode, 3...
... Band-shaped wire connection material, 4 ... Shielding material, 5 ... Bolt, 6
...Tabular part.
Claims (1)
これら鉄電極群に直流電流を通電して発生した鉄
イオンを海水中に供給し、海水使用機器の銅合金
部材表面に防食被膜を形成する鉄電解防食方法に
おいて、鉄イオンを供給して前記部材表面に安定
防食被膜を形成した後、この防食皮膜を低濃度の
鉄イオンの供給により維持するに際し、前記電極
表面の一部を頂部に平板状部を有する断面Ｔ字型
に形成した遮弊材の平板状部により電極間隔の一
部を閉鎖するとともに垂下部により電極の一部を
遮弊することによつて電極の電解電流密度を常に
適正な範囲に維持するようにすることを特徴とす
る鉄電解防食方法。 ２ 遮弊材が合成樹脂である特許請求の範囲第１
項記載の鉄電解防食方法。 ３ 電極の電解電流密度を10〜500A／m2とする
特許請求の範囲第１又は第２項記載の鉄電解防食
方法。[Claims] 1. Platy iron electrodes are stacked at appropriate intervals,
In the iron electrolytic corrosion protection method, iron ions generated by passing a direct current through these iron electrode groups are supplied into seawater to form an anticorrosion coating on the surface of a copper alloy member of equipment using seawater. After forming a stable anti-corrosion film on the surface, when this anti-corrosion film is maintained by supplying iron ions at a low concentration, a shielding material is provided in which a part of the electrode surface is formed into a T-shaped cross section with a flat plate portion at the top. The electrolytic current density of the electrodes is always maintained within an appropriate range by closing part of the electrode gap by the flat plate-like part and blocking part of the electrodes by the hanging parts. Iron electrolytic corrosion protection method. 2 Claim 1 in which the shielding material is a synthetic resin
Iron electrolytic corrosion protection method described in section. 3. The iron electrolytic corrosion protection method according to claim 1 or 2 , wherein the electrolytic current density of the electrode is 10 to 500 A/m2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57175679A JPS5967376A (en) | 1982-10-06 | 1982-10-06 | Preventing method for electrolytic corrosion of iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57175679A JPS5967376A (en) | 1982-10-06 | 1982-10-06 | Preventing method for electrolytic corrosion of iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5967376A JPS5967376A (en) | 1984-04-17 |
| JPH0250198B2 true JPH0250198B2 (en) | 1990-11-01 |
Family
ID=16000333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57175679A Granted JPS5967376A (en) | 1982-10-06 | 1982-10-06 | Preventing method for electrolytic corrosion of iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5967376A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0642816A (en) * | 1992-01-17 | 1994-02-18 | Nepon Kk | Method and apparatus for damping sound in hot air heater |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100187600B1 (en) * | 1991-07-24 | 1999-06-01 | 쿠니야스 테루히사 | Method for preventing coloring of aquatic organisms and apparatus |
| CN106222567B (en) * | 2016-10-24 | 2018-08-28 | 青岛双瑞海洋环境工程股份有限公司 | Electrolysis copper-iron alloy composite anode materials, electrode assembly and electrolysis unit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5844200B2 (en) * | 1978-08-08 | 1983-10-01 | 中川防蝕工業株式会社 | Corrosion prevention method for heat exchangers |
-
1982
- 1982-10-06 JP JP57175679A patent/JPS5967376A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0642816A (en) * | 1992-01-17 | 1994-02-18 | Nepon Kk | Method and apparatus for damping sound in hot air heater |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5967376A (en) | 1984-04-17 |
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