JP2012207280A - Basic treatment method of cooling water system - Google Patents
Basic treatment method of cooling water system Download PDFInfo
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- JP2012207280A JP2012207280A JP2011074616A JP2011074616A JP2012207280A JP 2012207280 A JP2012207280 A JP 2012207280A JP 2011074616 A JP2011074616 A JP 2011074616A JP 2011074616 A JP2011074616 A JP 2011074616A JP 2012207280 A JP2012207280 A JP 2012207280A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/105—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances combined with inorganic substances
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
- C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
- C23F11/173—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
- C02F2103/023—Water in cooling circuits
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/08—Corrosion inhibition
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- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
Description
本発明は、冷却水系において水処理を実施する場合に、環境規制などの理由でリンが使用できず、亜鉛を防食成分として使用している冷却水系の運転開始時の基礎処理方法に関する。本発明の冷却水系の基礎処理方法を採用することにより、非リン、亜鉛処理を行う冷却水系における運転中の系内の金属部材の腐食を抑制して、運転効率の向上、装置寿命の延長を図ることができる。 The present invention relates to a basic treatment method at the start of operation of a cooling water system in which phosphorus cannot be used for reasons such as environmental regulations and zinc is used as an anticorrosive component when water treatment is performed in a cooling water system. By adopting the basic treatment method of the cooling water system of the present invention, the corrosion of the metal members in the system during operation in the cooling water system that performs non-phosphorus and zinc treatment is suppressed, thereby improving the operation efficiency and extending the device life. Can be planned.
冷却水系における金属腐食は、製品の生産効率の低下やプラントの緊急停止など経済的に大きな問題を引き起こす。そのため、従来、冷却水系における金属の防食方法については多くの方法が提案されており、金属の腐食を止める方法として、一般的にはリン・亜鉛の高濃度添加が実施されている。
しかし、近年の環境規制の強化により、冷却水系においてリンを使用できない場合が増えてきているため、その対応策として様々な非リン、非亜鉛処理、及び非リン、亜鉛処理が実施されているが、防食効果はリン、亜鉛処理に比べて不十分である場合が多い。
Metal corrosion in the cooling water system causes major economic problems such as reduction in product production efficiency and emergency plant shutdown. For this reason, conventionally, many methods have been proposed for preventing corrosion of metals in a cooling water system, and as a method for stopping corrosion of metals, high concentration of phosphorus / zinc is generally used.
However, in recent years, due to the strengthening of environmental regulations, the number of cases where phosphorus cannot be used in the cooling water system has increased, and various non-phosphorus, non-zinc treatments, and non-phosphorus, zinc treatments have been implemented as countermeasures. In many cases, the anticorrosive effect is insufficient as compared with phosphorus and zinc treatment.
特許文献１には、リン、亜鉛処理を行う冷却水系における腐食防止のための運転開始時の基礎処理方法についての提案がなされているが、非リン、亜鉛処理を行う冷却水系における基礎処理方法については有効な方法が提案されていないのが現状である。 Patent Document 1 proposes a basic treatment method at the start of operation for preventing corrosion in a cooling water system in which phosphorus and zinc treatment is performed, but a basic treatment method in a cooling water system in which non-phosphorus and zinc treatment is performed. Currently, no effective method has been proposed.
本発明は、非リン、亜鉛処理を行う冷却水系において、運転中の系内の金属部材の腐食を防止するための運転開始時の基礎処理方法を提供することを課題とする。 An object of the present invention is to provide a basic treatment method at the start of operation for preventing corrosion of metal members in the system during operation in a cooling water system that performs non-phosphorus and zinc treatment.
本発明者は、上記課題を解決すべく鋭意検討を重ねた結果、非リン、亜鉛処理を行う冷却水系の運転開始に当たり、ｐＨ及びカルシウム硬度を特定の値に調整すると共に、水溶性ポリマーと亜鉛塩を特定の濃度で添加した水を用いて基礎処理を行うことにより、系内の金属部材表面に炭酸カルシウムの防食皮膜を形成させて、運転中の金属部材の腐食を効果的に抑制することができることを知見した。 As a result of intensive studies to solve the above-mentioned problems, the present inventor adjusted pH and calcium hardness to specific values at the start of operation of a cooling water system that performs non-phosphorus and zinc treatment, and also prepared a water-soluble polymer and zinc. By performing basic treatment using water with salt added at a specific concentration, a calcium carbonate anti-corrosion film is formed on the surface of the metal member in the system, effectively inhibiting corrosion of the metal member during operation. I found out that I can do it.
本発明はこのような知見に基いて達成されたものであり、本発明（請求項１）の冷却水系の基礎処理方法は、非リン、亜鉛処理を行う冷却水系の運転開始に当たって、該冷却水系内の水のｐＨを８．４〜８．６．カルシウム硬度を４００〜５００ｍｇ−ＣａＣＯ３／Ｌとすると共に、水溶性ポリマー５〜５０ｍｇ−固形分／Ｌと亜鉛塩１〜５ｍｇ−Ｚｎ／Ｌとを添加して、熱負荷をかけない状態で１日以上該水系内に水を循環させることを特徴とする。 The present invention has been achieved on the basis of such knowledge, and the basic treatment method of the cooling water system of the present invention (Claim 1) is the cooling water system at the start of operation of the cooling water system for performing non-phosphorus and zinc treatment. The pH of the water inside is 8.4 to 8.6. The calcium hardness is set to 400 to 500 mg-CaCO 3 / L, the water-soluble polymer 5 to 50 mg-solid content / L and the zinc salt 1 to 5 mg-Zn / L are added, and 1 is applied without applying a heat load. Water is circulated in the water system for more than a day.
請求項２の冷却水系の基礎処理方法は、請求項１において、前記水溶性ポリマーがアクリル酸とスルホン基含有モノマーとのコポリマーであることを特徴とする。 The basic treatment method for a cooling water system according to claim 2 is characterized in that, in claim 1, the water-soluble polymer is a copolymer of acrylic acid and a sulfone group-containing monomer.
請求項３の冷却水系の基礎処理方法は、請求項１又は２において、前記水系に硝酸カルシウムを添加してカルシウム硬度を調整することを特徴とする。 The basic treatment method for a cooling water system according to claim 3 is characterized in that, in claim 1 or 2, calcium nitrate is adjusted by adding calcium nitrate to the water system.
本発明によれば、非リン、亜鉛処理を行う冷却水系の運転開始に際して、系内の水のｐＨとカルシウム硬度を所定の値に調整すると共に、水溶性ポリマーと亜鉛塩を所定の濃度で添加した水を用いて基礎処理を行うことにより、系内の金属部材の表面に炭酸カルシウムの防食皮膜を形成させて、運転中の金属部材の腐食を効果的に抑制することができる。 According to the present invention, at the start of operation of a cooling water system that performs non-phosphorus and zinc treatment, the pH and calcium hardness of water in the system are adjusted to predetermined values, and a water-soluble polymer and a zinc salt are added at predetermined concentrations. By performing the basic treatment using the water, the corrosion protection film of calcium carbonate can be formed on the surface of the metal member in the system, and the corrosion of the metal member during operation can be effectively suppressed.
本発明によれば、後掲の実施例の結果からも明らかなように、非リン、亜鉛処理において、リン、亜鉛処理の場合と同等の防食効果を得ることができることから、リン不使用の処理により、リン使用の冷却水系におけるようなブロー水の排水時の処理（ブロー水量の調整、他系統へブロー水を貯留するなどの処理）の手間と時間を削減することができる。 According to the present invention, as is apparent from the results of the examples described later, in the non-phosphorus and zinc treatment, the same anticorrosion effect as in the case of phosphorous and zinc treatment can be obtained. Thus, it is possible to reduce the labor and time of the treatment (treatment of adjusting the amount of blow water, storing blow water in another system, etc.) at the time of drainage of blow water as in the cooling water system using phosphorus.
以下に本発明の冷却水系の基礎処理方法の実施の形態を詳細に説明する。 The embodiment of the basic treatment method for a cooling water system of the present invention will be described in detail below.
本発明においては、リンを使用せず、亜鉛を防食成分として用いる冷却水系の運転開始に当たって、該冷却水系内の水のｐＨを８．４〜８．６、カルシウム硬度を４００〜５００ｍｇ−ＣａＣＯ３／Ｌとすると共に、水溶性ポリマー５〜５０ｍｇ−固形分／Ｌと亜鉛塩１〜５ｍｇ−Ｚｎ／Ｌとを添加して、熱負荷をかけない状態で１日以上該水系内の水を循環させる。 In the present invention, at the start of operation of a cooling water system using zinc as an anticorrosive component without using phosphorus, the pH of the water in the cooling water system is 8.4 to 8.6, and the calcium hardness is 400 to 500 mg-CaCO 3. / L, water-soluble polymer 5-50 mg-solid content / L and zinc salt 1-5 mg-Zn / L are added, and the water in the water system is circulated for one day or more without applying a heat load. Let
この運転開始時のｐＨ調整のための酸消費量成分としては特に制限はなく、水酸化ナトリウムや重炭酸ナトリウムなどを用いることができる。
また、カルシウム硬度調整のためのカルシウム硬度成分としても特に制限はないが、腐食性塩類を含まないことから硝酸カルシウムを用いることが好ましい。
There is no restriction | limiting in particular as an acid consumption component for pH adjustment at the time of this operation start, Sodium hydroxide, sodium bicarbonate, etc. can be used.
Moreover, although there is no restriction | limiting in particular as a calcium hardness component for calcium hardness adjustment, it is preferable to use a calcium nitrate from not containing corrosive salt.
亜鉛塩としては特に制限はないが、通常、塩化亜鉛、硫酸亜鉛等の１種又は２種以上が用いられる。 Although there is no restriction | limiting in particular as zinc salt, Usually, 1 type (s) or 2 or more types, such as zinc chloride and zinc sulfate, are used.
水溶性ポリマーとしては特に制限はなく、冷却水系のスケール防止剤として用いられているものをいずれも好適に用いることができる。例えば、アクリル酸、メタアクリル酸、ＨＡＰＳ（２−ヒドロキシ−３−アリルオキシ−１−プロパンスルホン酸）、マレイン酸、ＡＭＰＳ（２−アクリルアミド−２−メチルプロパンスルホン酸）、ＨＥＭＡ（２−ヒドロキシエチルメタアクリレート）、アクリル酸メチル、スチレンスルホン酸、イソブチレンよりなる群から選ばれる１種又は２種以上のモノマーが重合又は共重合した、ホモポリマー又はコポリマー、好ましくはアクリル酸、メタアクリル酸、ＨＡＰＳ、マレイン酸、ＡＭＰＳ、イソブチレンよりなる群から選ばれる１種又は２種以上のモノマーが重合又は共重合した、ホモポリマー又はコポリマーであって、平均分子量が５０００〜５００００の低分子量水溶性ポリマーが挙げられる。 There is no restriction | limiting in particular as a water-soluble polymer, All can be used suitably as what is used as a scale inhibitor of a cooling water system. For example, acrylic acid, methacrylic acid, HAPS (2-hydroxy-3-allyloxy-1-propanesulfonic acid), maleic acid, AMPS (2-acrylamido-2-methylpropanesulfonic acid), HEMA (2-hydroxyethylmeta) Acrylate), methyl acrylate, styrene sulfonic acid, isobutylene, or a homopolymer or copolymer obtained by polymerization or copolymerization, preferably acrylic acid, methacrylic acid, HAPS, maleate. A low molecular weight water-soluble polymer having an average molecular weight of 5000 to 50000, which is a homopolymer or copolymer obtained by polymerization or copolymerization of one or more monomers selected from the group consisting of acid, AMPS, and isobutylene.
低分子水溶性ポリマーとしては、特にマレイン酸又はアクリル酸のホモポリマー或いは、アクリル酸とＨＡＰＳとのモル比２０〜８０：８０〜２０のコポリマー、アクリルアミドとＡＭＰＳとのモル比２０〜８０：８０〜２０のコポリマー、マレイン酸とイソブチレンとのモル比５０〜８０：５０〜２０のコポリマー等が好適である。
これらの水溶性ポリマーは１種を単独で用いても良く、２種以上を併用しても良い。
As the low-molecular water-soluble polymer, a homopolymer of maleic acid or acrylic acid, a copolymer of acrylic acid and HAPS in a molar ratio of 20-80: 80-20, or a molar ratio of acrylamide and AMPS of 20-80: 80- 20 copolymers, copolymers of maleic acid and isobutylene in a molar ratio of 50-80: 50-20, etc. are preferred.
These water-soluble polymers may be used alone or in combination of two or more.
本発明においては、非リン、亜鉛処理の冷却水系における運転開始時に
ｐＨ：８．４〜８．６
カルシウム硬度：４００〜５００ｍｇ−ＣａＣＯ３／Ｌ
水溶性ポリマー濃度：５〜５０ｍｇ−固形分／Ｌ
亜鉛塩濃度：１〜５ｍｇ−Ｚｎ／Ｌ
に調整した水を熱負荷をかけない状態で１日以上系内を循環させる。ｐＨ、カルシウム硬度、水溶性ポリマー濃度、亜鉛塩濃度のいずれか１つでも上記範囲を外れると本発明による効果、即ち、系内の金属部材の表面に炭酸カルシウムの防食皮膜を形成させて、運転中の金属部材の腐食を効果的に抑制する効果を得ることができない。
この循環時間は１日以上であればよく、その上限については特に制限はないが、運転効率の面で通常５日以下である。
In the present invention, pH: 8.4 to 8.6 at the start of operation in a non-phosphorus, zinc-treated cooling water system.
Calcium hardness: 400-500 mg-CaCO 3 / L
Water-soluble polymer concentration: 5 to 50 mg-solid content / L
Zinc salt concentration: 1-5 mg-Zn / L
The adjusted water is circulated in the system for one day or more without applying a heat load. If any one of pH, calcium hardness, water-soluble polymer concentration, and zinc salt concentration is out of the above range, the effect of the present invention, that is, a calcium carbonate anticorrosion film is formed on the surface of the metal member in the system, and the operation is performed. The effect which suppresses corrosion of the inside metal member effectively cannot be acquired.
The circulation time may be one day or longer, and the upper limit thereof is not particularly limited, but is usually 5 days or less in terms of operating efficiency.
このように、運転開始に当たって、所定の水質の水を系内に循環させた後は、系内のブロー水量に応じて補給水を入れて定常運転条件に近づけてゆく。 As described above, at the start of operation, after circulating water of a predetermined water quality in the system, makeup water is added in accordance with the amount of blow water in the system to approach the steady operation conditions.
なお、運転開始後の定常運転時の水系の条件としては、
ｐＨ：８．２〜９．０
カルシウム硬度：３００〜１，０００ｍｇ−ＣａＣＯ３／Ｌ
水溶性ポリマー濃度：５〜２０ｍｇ−固形分／Ｌ
亜鉛塩濃度：１〜３ｍｇ−Ｚｎ／Ｌ
とすることが好ましい。
In addition, as conditions of the water system during steady operation after the start of operation,
pH: 8.2-9.0
Calcium hardness: 300 to 1,000 mg-CaCO 3 / L
Water-soluble polymer concentration: 5 to 20 mg-solid content / L
Zinc salt concentration: 1-3 mg-Zn / L
It is preferable that
以下に実施例を挙げて本発明をより具体的に説明する。 Hereinafter, the present invention will be described more specifically with reference to examples.
［実施例１］
図１に示す試験装置を用いて、以下の手順で基礎処理試験を行った。
図１において、１１は冷却塔、１２は冷却水槽、１４は熱交換器、１５は電気ヒーター、１６は伝熱チューブ（軟鋼チューブ）、Ｐ１，Ｐ２，Ｐ３は薬注ポンプ、Ｐ４はブローポンプ、Ｐ５は循環ポンプであり、冷却水槽１２内の冷却水は、循環ポンプＰ５により熱交換器１４が設けられた循環水系に循環され、熱交換器１４からの循環冷却水は冷却塔１１で冷却された後、冷却水槽１２に戻される。
[Example 1]
Using the test apparatus shown in FIG. 1, a basic treatment test was performed according to the following procedure.
In FIG. 1, 11 is a cooling tower, 12 is a cooling water tank, 14 is a heat exchanger, 15 is an electric heater, 16 is a heat transfer tube (soft steel tube), P 1 , P 2 and P 3 are chemical injection pumps, P 4 blow pump, P 5 is a circulation pump, the cooling water in the cooling water tank 12 is circulated in the circulating water system to the
（１）野木町水（ｐＨ７．８、カルシウム硬度４０ｍｇ−ＣａＣＯ３／Ｌ）を２００Ｌのタンクに入れた。
（２）５重量％重炭酸ナトリウム水溶液を添加してｐＨ８．６に調整した。
（３）アクリル酸／ＨＡＰＳコポリマー（分子量１００００，アクリル酸：ＨＡＰＳ＝８：２（モル比））を１５ｍｇ−固形分／Ｌ添加した。
（４）１０重量％硝酸カルシウム溶液を添加して、カルシウム硬度５００ｍｇ−ＣａＣＯ３／Ｌに調整した。
（５）１０重量％硫酸亜鉛水溶液を２ｍｇ−Ｚｎ／Ｌ添加した。
（６）５重量％重炭酸ナトリウム水溶液でｐＨ８．６に微調整した。
（７）上記（１）〜（６）の調整を行った試験水を冷却水槽１２に入れ、循環ポンプＰ５で軟鋼チューブ１６に２４時間通水した。
（８）２４時間後、系内の水の全ブローを実施し、保持処理水（ｐＨ：８．６、カルシウム硬度：５００ｍｇ−ＣａＣＯ３／Ｌ、アクリル酸／ＨＡＰＳコポリマー：１５ｍｇ−固形分／Ｌ、Ｚｎ：２ｍｇ／Ｌ）に入れ替え、熱負荷を開始した（流速０．５ｍ／ｓ、ΔＴ１０℃）。（なお、流速は循環冷却水の流速であり、ΔＴは、伝熱チューブ１６内を流れる循環冷却水の熱交換器出口温度と入口温度との差である。）
（９）１４日後、軟鋼チューブ１６を引き上げ、錆の付着量を測定し、単位面積当たりの１ヶ月間の錆付着量（錆付着速度）に換算した。
(1) Nogimachi water (pH 7.8, calcium hardness 40 mg-CaCO 3 / L) was placed in a 200 L tank.
(2) A 5 wt% aqueous sodium bicarbonate solution was added to adjust the pH to 8.6.
(3) Acrylic acid / HAPS copolymer (molecular weight 10,000, acrylic acid: HAPS = 8: 2 (molar ratio)) was added at 15 mg-solid content / L.
(4) A 10 wt% calcium nitrate solution was added to adjust the calcium hardness to 500 mg-CaCO 3 / L.
(5) 2 mg-Zn / L of 10 wt% zinc sulfate aqueous solution was added.
(6) Fine adjustment to pH 8.6 with 5 wt% aqueous sodium bicarbonate solution.
(7) above (1) to adjust the test water placed in a cooling water bath 12 was performed in (6), and 24 hours water passage
(8) After 24 hours, all the water in the system was blown, and retained water (pH: 8.6, calcium hardness: 500 mg-CaCO 3 / L, acrylic acid / HAPS copolymer: 15 mg-solid content / L , Zn: 2 mg / L), and the thermal load was started (flow rate 0.5 m / s, ΔT10 ° C.). (Note that the flow rate is the flow rate of the circulating cooling water, and ΔT is the difference between the heat exchanger outlet temperature and the inlet temperature of the circulating cooling water flowing in the heat transfer tube 16).
(9) After 14 days, the
結果を表１に示す。 The results are shown in Table 1.
［比較例１］
実施例１において、基礎処理時に野木町水に更に１００ｍｇ−ＰＯ４／Ｌとなるようにヘキサメタリン酸ソーダを添加し、また亜鉛塩濃度が２０ｍｇ−Ｚｎ／Ｌとなるようにしてリン、亜鉛処理を行ったこと以外は同様の条件で試験を行い、結果を表１に示した。
[Comparative Example 1]
In Example 1, sodium hexametaphosphate was further added to Nogi-cho water at the time of basic treatment so as to be 100 mg-PO 4 / L, and phosphorus and zinc treatment were performed so that the zinc salt concentration was 20 mg-Zn / L. A test was conducted under the same conditions as those described above, and the results are shown in Table 1.
［実施例２、比較例２〜５］
実施例１において、基礎処理時の試験水のカルシウム硬度を表１に示す値としたこと以外は同様の条件で試験を行い、結果を表１に示した。
[Example 2, Comparative Examples 2 to 5]
In Example 1, the test was conducted under the same conditions except that the calcium hardness of the test water at the time of the basic treatment was changed to the value shown in Table 1, and the results are shown in Table 1.
表１より、本発明の基礎処理方法に従ってｐＨとカルシウム硬度を調整すると共に水溶性ポリマーと亜鉛塩を添加して基礎処理を行うことにより、リン、亜鉛基礎処理と同等の防食効果が得られることが分かる。 From Table 1, by adjusting the pH and calcium hardness according to the basic treatment method of the present invention and adding a water-soluble polymer and a zinc salt to perform the basic treatment, an anticorrosive effect equivalent to phosphorus and zinc basic treatment can be obtained. I understand.
１１ 冷却塔
１２ 冷却水槽
１４ 熱交換器
１５ 電気ヒーター
１６ 伝熱チューブ（軟鋼チューブ）
11 Cooling Tower 12
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