JPH0446640B2 - - Google Patents
Info
- Publication number
- JPH0446640B2 JPH0446640B2 JP17787989A JP17787989A JPH0446640B2 JP H0446640 B2 JPH0446640 B2 JP H0446640B2 JP 17787989 A JP17787989 A JP 17787989A JP 17787989 A JP17787989 A JP 17787989A JP H0446640 B2 JPH0446640 B2 JP H0446640B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- cooling water
- water treatment
- hydrazine
- circulating cooling
- 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
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
- 239000000498 cooling water Substances 0.000 claims description 23
- 150000002429 hydrazines Chemical class 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 238000005260 corrosion Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 3
- 239000003112 inhibitor Substances 0.000 claims description 3
- 239000002455 scale inhibitor Substances 0.000 claims 1
- 239000000126 substance Substances 0.000 description 8
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 239000008399 tap water Substances 0.000 description 4
- 235000020679 tap water Nutrition 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- YXIWHUQXZSMYRE-UHFFFAOYSA-N 1,3-benzothiazole-2-thiol Chemical compound C1=CC=C2SC(S)=NC2=C1 YXIWHUQXZSMYRE-UHFFFAOYSA-N 0.000 description 2
- GUUULVAMQJLDSY-UHFFFAOYSA-N 4,5-dihydro-1,2-thiazole Chemical compound C1CC=NS1 GUUULVAMQJLDSY-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- NWZSZGALRFJKBT-KNIFDHDWSA-N (2s)-2,6-diaminohexanoic acid;(2s)-2-hydroxybutanedioic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O.NCCCC[C@H](N)C(O)=O NWZSZGALRFJKBT-KNIFDHDWSA-N 0.000 description 1
- FUSNOPLQVRUIIM-UHFFFAOYSA-N 4-amino-2-(4,4-dimethyl-2-oxoimidazolidin-1-yl)-n-[3-(trifluoromethyl)phenyl]pyrimidine-5-carboxamide Chemical compound O=C1NC(C)(C)CN1C(N=C1N)=NC=C1C(=O)NC1=CC=CC(C(F)(F)F)=C1 FUSNOPLQVRUIIM-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- BIVUUOPIAYRCAP-UHFFFAOYSA-N aminoazanium;chloride Chemical compound Cl.NN BIVUUOPIAYRCAP-UHFFFAOYSA-N 0.000 description 1
- VFTOLAKHPLTCIF-UHFFFAOYSA-N aminoazanium;dihydrogen phosphate Chemical compound NN.OP(O)(O)=O VFTOLAKHPLTCIF-UHFFFAOYSA-N 0.000 description 1
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 1
- 239000012964 benzotriazole Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- PTYMQUSHTAONGW-UHFFFAOYSA-N carbonic acid;hydrazine Chemical compound NN.OC(O)=O PTYMQUSHTAONGW-UHFFFAOYSA-N 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine monohydrate Substances O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 description 1
- 229910000377 hydrazine sulfate Inorganic materials 0.000 description 1
- 239000012493 hydrazine sulfate Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- -1 organic acid salts Chemical class 0.000 description 1
- 230000021962 pH elevation Effects 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920001444 polymaleic acid Polymers 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
Description
〔産業上の利用分野〕
本発明は開放系循環冷却水を処理する方法に関
し、とくに高濃縮循環冷却水系に発生する各種障
害を防止する方法およびこれに用いる水処理用の
薬剤に関する。
〔従来の技術〕
近年、ビル等における空調設備の普及にともな
い、一般産業用における冷却媒体としての水の利
用と同様に、冷却水を循環使用することが多くな
つてきている。
かかる冷却用の水としては水道水や井戸水など
が利用されることが多いが、冷凍装置などで熱を
受け取つて温まつた水は、冷却塔などにおいて空
気と接触させて一部を蒸発することにより熱を放
出し、冷却した後再び冷却水として循環使用され
る。このようにして循環使用される冷却水中の塩
類は、次第に濃縮されて高濃度となり、スケール
の発生やスライムの発生等による熱交換効率の低
下、設備や配管内部の腐食などの障害を引き起こ
すこととなる。従つて循環冷却水は、蒸発して減
少した水を補給するとともに濃縮水の一部を時々
排出して、塩類濃度の調整を行なうことが必要で
あり、さらにまた上記のような障害の発生を防止
するために種々の水処理用薬剤を添加することが
行われている。
このような水処理用薬剤としては、腐食防止用
としてたとえばメルカプトベンゾチアゾール、ベ
ンゾトリアゾールなど、スケール防止用としてた
とえばポリアクリル酸やポリマレイン酸の塩な
ど、スライム防止用として次亜塩素酸ナトリウ
ム、イソチアゾリン、水加ヒドラジンなどが知ら
れており、これらは単独にまたは配合した薬剤と
して使用される。こうした水処理用薬剤は、取扱
い上の簡便さから、各種の薬剤を配合して液状と
したもので利用されることが多いが、更に使い勝
手や安全性の点から、PHを中性ないしややアルカ
リ性としたものが好まれている。
〔発明が解決しようとする課題〕
このような循環冷却水系の運転に際して、水資
源の節約という観点から高濃縮度運転をする傾向
が強まつており、その結果冷却水系のPHが著しく
アルカリ側に偏り、時にはPH９ないしそれ以上と
なる場合が多くなつてきている。
このような冷却水のPHの上昇は、スケール成分
である炭酸カルシウムの生成を促進するばかりで
なく、排出水による下水道等の汚染を防ぐために
排出水をPH９未満とくに8.6未満まで中和処理す
るか、または高濃縮度運転を諦めて早目に水の排
出・補給を行なうなどで対処していた。
そこで本発明は、このような循環冷却水のアル
カリ性化を防止し、高濃縮度運転を可能とする水
処理方法を提供することを目的とした。
〔課題を解決するための手段〕
上記のような本発明の目的は、循環冷却水中に
ヒドラジン塩を添加することを特徴とする冷却水
の処理方法によつて達成される。
さらに、本発明の処理方法を実施するために用
いられる好適な水処理薬剤として、腐食防止剤、
スケール防止剤、あるいはスライム防止剤の少な
くともいずれかひとつを含む薬剤であつて、ヒド
ラジン塩を含有しているものが提供される。
本発明におけるヒドラジン塩とは、塩酸ヒドラ
ジン、硫酸ヒドラジン、炭酸ヒドラジン、燐酸ヒ
ドラジンなどの無機酸塩または有機酸塩などであ
つて、通常用いられる水処理用の薬剤などととも
に水に溶解しさらに水酸化ナトリウムや水酸化カ
リウムなどを用いてPHを調整して、たとえば一液
型の液剤とされる。
循環冷却水に対するヒドラジン塩の添加量が多
いときはPHを酸性側に移動させる力が強く、また
少ないときは弱いから、ヒドラジン塩の添加量は
循環冷却水系の運転状況に対応して、それぞれの
場合ごとに決定することが好ましい。
〔作用〕
本発明に従つてヒドラジン塩が添加された循環
冷却水は、最初はアルカリ性であつても次第に酸
性に移る。そして、循環使用により塩類の濃縮が
起つても、ヒドラジンが分解消失することによつ
て放出された酸が系のアルカリ性化を阻止するよ
うに働くものである。
実施例 １
第１表に示すような水処理薬剤を１ml添加した
試験水（東京都水道水）1000mlを開放容器に入
れ、面積0.52dm2の鋼片を浸漬し、室温で撹拌を
継続しながらPHの経時変化を調べた。
その結果は、水処理薬剤を添加しないブランク
試験の結果とともに第２表に示した。
[Industrial Field of Application] The present invention relates to a method for treating open circulating cooling water, and more particularly to a method for preventing various disorders occurring in a highly concentrated circulating cooling water system, and a water treatment agent used therein. [Prior Art] In recent years, with the spread of air conditioning equipment in buildings and the like, cooling water has become increasingly used in circulation, similar to the use of water as a cooling medium in general industry. Tap water, well water, etc. are often used as water for such cooling, but once the water is warmed by receiving heat from a refrigeration system, it is brought into contact with air in a cooling tower, etc., and a portion of it evaporates. After the water is cooled, it releases heat and is recycled again as cooling water. The salts in the cooling water that is circulated in this way gradually becomes concentrated and becomes highly concentrated, causing problems such as a decrease in heat exchange efficiency due to the formation of scale and slime, and corrosion inside equipment and piping. Become. Therefore, in circulating cooling water, it is necessary to replenish the water that has decreased due to evaporation and to occasionally discharge a portion of the concentrated water to adjust the salt concentration. In order to prevent this, various water treatment chemicals have been added. Such water treatment agents include mercaptobenzothiazole and benzotriazole for corrosion prevention, polyacrylic acid and polymaleic acid salts for scale prevention, and sodium hypochlorite, isothiazoline, isothiazoline, etc. for slime prevention. Hydrazine hydrate and the like are known, and these are used alone or as a combination of drugs. These water treatment chemicals are often used in liquid form, which is a combination of various chemicals, for ease of handling. People prefer things that are. [Problem to be solved by the invention] When operating such a circulating cooling water system, there is a growing tendency to operate at a high concentration from the perspective of saving water resources, and as a result, the PH of the cooling water system becomes significantly alkaline. It is becoming more and more common for people to have a PH of 9 or even higher. Such an increase in the pH of cooling water not only promotes the formation of calcium carbonate, which is a scale component, but also requires neutralization treatment of the wastewater to a pH of less than 9, especially less than 8.6, in order to prevent wastewater from contaminating sewers, etc. Or, the solution was to give up on high-concentration operation and drain and replenish water as soon as possible. Therefore, an object of the present invention is to provide a water treatment method that prevents such alkalinization of circulating cooling water and enables highly concentrated operation. [Means for Solving the Problems] The objects of the present invention as described above are achieved by a cooling water treatment method characterized by adding a hydrazine salt to circulating cooling water. Furthermore, suitable water treatment agents used to carry out the treatment method of the present invention include corrosion inhibitors,
A drug containing at least one of an anti-scaling agent and an anti-slime agent and containing a hydrazine salt is provided. In the present invention, hydrazine salts are inorganic or organic acid salts such as hydrazine hydrochloride, hydrazine sulfate, hydrazine carbonate, and hydrazine phosphate, and are dissolved in water together with commonly used water treatment agents and then hydroxylated. The pH is adjusted using sodium, potassium hydroxide, etc., and it is made into a one-component solution, for example. When the amount of hydrazine salt added to the circulating cooling water is large, the force to move the PH toward the acidic side is strong, and when it is small, the force is weak. It is preferable to decide on a case-by-case basis. [Operation] Although the circulating cooling water to which hydrazine salt has been added according to the present invention is initially alkaline, it gradually becomes acidic. Even if the salts are concentrated due to cyclic use, the acid released by the decomposition and disappearance of hydrazine acts to prevent the system from becoming alkaline. Example 1 1000 ml of test water (Tokyo tap water) containing 1 ml of the water treatment chemicals shown in Table 1 was placed in an open container, a steel piece with an area of 0.52 dm 2 was immersed, and the mixture was heated at room temperature while stirring. We investigated changes in PH over time. The results are shown in Table 2 along with the results of a blank test in which no water treatment chemicals were added.
【表】
＊ 対照例
[Table] * Control example
【表】
＊ 対照例
この結果から、ヒドラジン塩が水のPHを低下さ
せる能力を有していることがわかる。
実施例 ２
第３表に示すような水処理薬剤を0.6ml添加し
た試験水（東京都水道水）1000mlを解放容器に入
れ、面積0.52dm2の鋼片と同じく面積0.52dm2の銅
片とを浸漬し、30℃で撹拌をわながらPHの経日変
化を調べた。その結果は、水処理薬剤を添加しな
いブランク試験の結果とともに第４表に示した。[Table] * Control example This result shows that hydrazine salt has the ability to lower the pH of water. Example 2 1000 ml of test water (Tokyo tap water) containing 0.6 ml of water treatment chemicals as shown in Table 3 was put into an open container, and a steel piece with an area of 0.52 dm 2 and a copper piece with an area of 0.52 dm 2 were added. was immersed in water and stirred at 30°C to examine changes in pH over time. The results are shown in Table 4 along with the results of a blank test in which no water treatment chemicals were added.
【表】【table】
【表】【table】
【表】
＊ 対照例
この結果から、ヒドラジン塩は水のPHをアルカ
リ側から酸性側に向つて変化させることがわか
る。
実施例 ３
能力１冷凍トンの試験用冷却塔を用い、循環水
量0.8m3／Hr、入口水温38℃、出口水温35℃の条
件で、冷却水の循環運転を行なつた。
補給水としては、導電率130μS／cm、PH7.6の工
業用水道水に第５表に示すような水処理薬剤を
50ppm混入したものを使用し、強制ブローは取り
付けた導電率計の信号によつて自動的に実施し
た。
このようにして運転を継続し、定常状態となつ
たときのブロー水、すなわち循環冷却水の水質を
調べた結果を第６表に示した。
この結果を見ると、ヒドラジン塩を添加した本
発明においては循環冷却水のPHが高くならず高濃
縮度運転ができるのに対して、水加ヒドラジンを
添加した系では濃縮度５〜６倍という低濃縮度運
転でもPHが制限値ぎりぎりまで上昇していること
がわかる。[Table] * Control example This result shows that hydrazine salt changes the pH of water from the alkaline side to the acidic side. Example 3 A test cooling tower with a capacity of 1 refrigeration ton was used to circulate cooling water under conditions of a circulating water flow rate of 0.8 m 3 /Hr, an inlet water temperature of 38°C, and an outlet water temperature of 35°C. As make-up water, industrial tap water with a conductivity of 130 μS/cm and a pH of 7.6 is treated with water treatment chemicals as shown in Table 5.
A mixture containing 50 ppm was used, and forced blowing was performed automatically based on the signal from the attached conductivity meter. Table 6 shows the results of examining the quality of the blow water, that is, the circulating cooling water, when the operation continued in this manner and a steady state was reached. Looking at these results, in the present invention in which hydrazine salt is added, the pH of the circulating cooling water does not increase and high concentration operation is possible, whereas in the system in which hydrated hydrazine is added, the concentration is 5 to 6 times higher. It can be seen that even in low concentration operation, the PH rises to just above the limit value.
【表】
＊ 対照例
[Table] * Control example
【表】
＊ 対照例
〔発明の効果〕
本発明の冷却水の処理方法によれば、冷却水の
PHが温度に上昇することなしに運転することがで
きるから、ブロー排水による環境汚染の心配なく
高濃縮度運転が可能であり、高度の節水ができる
ばかりでなく経済的でもある。[Table] * Control example
[Effect of the invention] According to the cooling water treatment method of the present invention, cooling water
Since it can be operated without the pH rising to temperature, it is possible to operate at a high concentration without worrying about environmental pollution due to blow waste water, which not only allows for a high degree of water conservation but is also economical.
Claims (1)
を特徴とする冷却水の処理方法。 ２ 循環冷却水中にヒドラジン塩を含有する水処
理用薬剤を添加することを特徴とする冷却水の処
理方法。 ３ 腐食防止剤、スケール防止剤、あるいはスラ
イム防止剤の少なくともいずれかひとつを含む薬
剤であつて、ヒドラジン塩を含有していることを
特徴とする水処理薬剤。[Claims] 1. A cooling water treatment method characterized by adding a hydrazine salt to circulating cooling water. 2. A cooling water treatment method characterized by adding a water treatment agent containing a hydrazine salt to circulating cooling water. 3. A water treatment agent containing at least one of a corrosion inhibitor, a scale inhibitor, or a slime inhibitor, and which is characterized by containing a hydrazine salt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17787989A JPH0347593A (en) | 1989-07-12 | 1989-07-12 | Treatment of cooling water and water treatment agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17787989A JPH0347593A (en) | 1989-07-12 | 1989-07-12 | Treatment of cooling water and water treatment agent |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0347593A JPH0347593A (en) | 1991-02-28 |
| JPH0446640B2 true JPH0446640B2 (en) | 1992-07-30 |
Family
ID=16038655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17787989A Granted JPH0347593A (en) | 1989-07-12 | 1989-07-12 | Treatment of cooling water and water treatment agent |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0347593A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103865581A (en) * | 2012-12-11 | 2014-06-18 | 中国石油化工集团公司 | Scale inhibitor for inhibiting scale formation on flue gas turbine blade |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5990726B2 (en) * | 2011-03-29 | 2016-09-14 | ナルコジャパン合同会社 | Method for stabilizing water treatment chemicals |
| CN109516575A (en) * | 2017-09-18 | 2019-03-26 | 中国石油化工股份有限公司 | A kind of processing method of high iron circulation cooling water |
| CN109516577A (en) * | 2017-09-18 | 2019-03-26 | 中国石油化工股份有限公司 | A kind of processing method of high iron circulation cooling water |
| CN109516576A (en) * | 2017-09-18 | 2019-03-26 | 中国石油化工股份有限公司 | A kind of processing method of high iron circulation cooling water |
| JP2023527312A (en) | 2020-05-28 | 2023-06-28 | エコラボ ユーエスエー インコーポレイティド | Closed-loop cooling water corrosion inhibition using polymaleate and non-borate buffers |
-
1989
- 1989-07-12 JP JP17787989A patent/JPH0347593A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103865581A (en) * | 2012-12-11 | 2014-06-18 | 中国石油化工集团公司 | Scale inhibitor for inhibiting scale formation on flue gas turbine blade |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0347593A (en) | 1991-02-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3383441B2 (en) | Method for preventing corrosion of closed cooling system, scale and corrosion inhibiting composition | |
| US3766077A (en) | Compositions and method for inhibiting scaling in aqueous systems | |
| JPH0994598A (en) | Anti-corrosion / scale prevention method for open circulating cooling water system | |
| JP5128839B2 (en) | Water treatment method for open circulation type cooling water system and water treatment agent for open circulation type cooling water system | |
| JP3663634B2 (en) | Operation method of circulating cooling water system | |
| JPH0446640B2 (en) | ||
| JPH05230676A (en) | Synergistic combination of sodium silicate and orthophosphate for corrosion inhibition of carbon steel | |
| JP2008006369A (en) | Scale prevention method | |
| JPH07109585A (en) | Circulating water treatment method | |
| JP4934896B2 (en) | Multifunctional water treatment agent | |
| JP4682273B2 (en) | Water treatment method for circulating cooling water system | |
| WO2021082305A1 (en) | Circulating cooling water treatment device and circulating cooling water treatment method | |
| JPH04311583A (en) | Cooling water treating agent | |
| JP7363875B2 (en) | Water-based metal corrosion protection treatment method | |
| JP3287284B2 (en) | Boiler water treatment chemical | |
| JPH09176872A (en) | Method for inhibiting corrosion of aqueous metal and inhibiting silica scale | |
| US5232629A (en) | Synergistic combination of sodium silicate and ortho-phosphate for controlling carbon steel corrosion | |
| JPH02227193A (en) | Method for preventing generation of rust and/or scale in water channel | |
| JP2009299161A (en) | Metal corrosion suppression method of water system | |
| JPH02122898A (en) | Treatment of cooling-water | |
| JPH0557040B2 (en) | ||
| JP2013166092A (en) | Scale adhesion preventing method, and scale adhesion inhibitor | |
| JP2004132636A (en) | Corrosion inhibition method of iron-based metal | |
| JP5824841B2 (en) | Method for inhibiting corrosion of copper-based parts | |
| JP2002193707A (en) | Multifunctional water treatment agent |