JP3203797B2 - Corrosion protection for copper and iron materials - Google Patents
Corrosion protection for copper and iron materialsInfo
- Publication number
- JP3203797B2 JP3203797B2 JP24049192A JP24049192A JP3203797B2 JP 3203797 B2 JP3203797 B2 JP 3203797B2 JP 24049192 A JP24049192 A JP 24049192A JP 24049192 A JP24049192 A JP 24049192A JP 3203797 B2 JP3203797 B2 JP 3203797B2
- Authority
- JP
- Japan
- Prior art keywords
- copper
- based material
- iron
- corrosion
- potential
- 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 - Fee Related
Links
Landscapes
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は銅系材質と鉄系材質の防
食方法に係り、特に、水系に共存する鉄系材質の腐食を
加速することなく、孔食電位以上に電位の上昇した銅系
材質の電位を低下させ、その孔食を有効に防止する銅系
材質と鉄系材質の防食方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing corrosion of a copper-based material and an iron-based material. The present invention relates to an anticorrosion method for a copper-based material and an iron-based material that lowers the potential of a system material and effectively prevents pitting.
【０００２】[0002]
【従来の技術】冷却水系等の各種水系に使用される銅又
は銅合金よりなる配管、その他の部材では、銅（又は銅
合金）の腐食ないしは腐食による孔食が大きな問題とな
っている。2. Description of the Related Art Corrosion of copper (or copper alloy) or pitting corrosion due to corrosion is a serious problem in piping and other members made of copper or copper alloy used in various water systems such as a cooling water system.
【０００３】銅材質の孔食は、孔食発生電位といわれて
いる１９０ｍＶ（飽和銀／塩化銀電極）以上に当該銅材
質の電位が上昇することにより進行する。[0003] Pitting of a copper material proceeds when the potential of the copper material rises to 190 mV (saturated silver / silver chloride electrode) or more, which is said to be the pitting potential.
【０００４】従来、銅材質の腐食防止のために、水系に
防食剤を添加する方法が多く採用されており、防食剤と
してはトリルトリアゾール等が使用されている。Hitherto, in order to prevent corrosion of copper materials, a method of adding an anticorrosive to an aqueous system has been often adopted, and tolyltriazole or the like is used as the anticorrosive.
【０００５】しかしながら、トリルトリアゾール等の従
来の防食剤では、十分な防食効果が得られない場合があ
った。[0005] However, conventional anticorrosive agents such as tolyltriazole sometimes fail to provide a sufficient anticorrosive effect.
【０００６】これに対して、本出願人は、良好な電位低
下作用のあるヒドラジン系の薬剤を併用する方法を提案
した（特願平３−２８９１１３）。On the other hand, the present applicant has proposed a method in which a hydrazine-based drug having a good potential lowering action is used in combination (Japanese Patent Application No. 3-289113).
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、ヒドラ
ジン系薬剤を併用した場合であっても、銅系材質から銅
イオンが溶出し、この溶出銅イオンが、水系に共存する
鉄系材質の腐食に悪影響を及ぼし、鉄系材質の腐食が促
進されるという問題点があった。However, even when a hydrazine-based drug is used in combination, copper ions elute from the copper-based material, and the eluted copper ions adversely affect the corrosion of the iron-based material coexisting in the aqueous system. And the corrosion of the iron-based material is promoted.
【０００８】即ち、ヒドラジン系薬剤は、一旦上昇した
銅系材質の自然電位の低下には有効であるが、低下させ
ることのできる電位が比較的高く、また、上述の如く、
鉄系材質に対する銅イオンの影響を排除する能力がない
などの不具合があった。That is, the hydrazine-based drug is effective in lowering the spontaneous potential of the copper-based material once increased, but has a relatively high potential which can be reduced.
There were problems such as an inability to eliminate the effect of copper ions on iron-based materials.
【０００９】本発明は上記従来の問題点を解決し、銅系
材質と鉄系材質とが共存する、開放又は密閉冷却水系或
いは蓄熱冷温水系において、鉄系材質の腐食を促進させ
ることなく、銅系材質の腐食ないし孔食を有効に防止す
ることができる銅系材質と鉄系材質の防食方法を提供す
ることを目的とする。The present invention solves the above-mentioned conventional problems, and discloses an open or closed cooling water system or a system in which a copper-based material and an iron-based material coexist.
Another object of the present invention is to provide an anticorrosion method for copper-based materials and iron-based materials that can effectively prevent corrosion of copper-based materials or pitting corrosion without accelerating corrosion of iron-based materials in a heat storage cold / hot water system. And
【００１０】[0010]
【課題を解決するための手段】本発明の銅系材質と鉄系
材質の防食方法は、銅系材質と鉄系材質とが共存する、
開放又は密閉冷却水系或いは蓄熱冷温水系に、グルタル
アルデヒドを５〜５００ｍｇ／ｌ間欠的に添加すること
により、銅系材質の自然電位を低下させると共に、銅イ
オンの溶出を防止することを特徴とする。According to the present invention, there is provided a method for preventing corrosion of a copper-based material and an iron-based material, wherein the copper-based material and the iron-based material coexist .
Glutaraldehyde intermittently added to open or closed cooling water system or heat storage cold / hot water system
Reduces the natural potential of copper-based materials and
It is characterized in that ON elution is prevented .
【００１１】以下に本発明を詳細に説明する。Hereinafter, the present invention will be described in detail.
【００１２】本発明の銅系材質と鉄系材質の防食方法に
おいて、銅系材質及び鉄系材質が共存する水系に対する
グルタルアルデヒド（ＯＨＣＣＨ2 ＣＨ2 ＣＨ2 ＣＨ
Ｏ）の添加量が少な過ぎると十分な防食効果が得られな
い。グルタルアルデヒドの添加量は多過ぎても特に問題
はないが、効果に大差はなく、薬剤コストの高騰を招く
ことから、グルタルアルデヒドは、当該水系の保有水に
５〜５００ｍｇ／ｌ、好ましくは１０〜５０ｍｇ／ｌと
なるように、間欠的に添加する。In the method for preventing corrosion of a copper-based material and an iron-based material according to the present invention, glutaraldehyde (OHCCH 2 CH 2 CH 2 CH) is used for an aqueous system in which a copper-based material and an iron-based material coexist.
If the amount of O) is too small, a sufficient anticorrosion effect cannot be obtained. There is no particular problem if the amount of glutaraldehyde added is too large, but there is no significant difference in the effect and the cost of the drug rises. Therefore, glutaraldehyde is added to the water in the aqueous system in an amount of 5 to 500 mg / l, preferably 10 It is added intermittently to be ５０50 mg / l.
【００１３】なお、グルタルアルデヒドの間欠添加の方
法としては特に制限はなく、所定期間毎に一定量を添加
しても良く、また、水系の銅系材質の自然電位を測定
し、その値が所定値以上になった時に一定量のグルタル
アルデヒドを添加するようにしても良い。[0013] The method of intermittent addition of glutaraldehyde is not particularly limited, a fixed amount may be added every predetermined period, and the spontaneous potential of an aqueous copper-based material is measured. A certain amount of glutaraldehyde may be added when the value exceeds the value.
【００１４】所定期間毎に間欠添加する場合、その添加
頻度は、被処理対象水系によっても異なるが、グルタル
アルデヒドは、長期効果持続性に優れることから、３〜
６ヶ月に１回の添加頻度で十分な効果を得ることができ
る。また、銅系材質の自然電位の測定値に基いて間欠添
加する場合には、その値が１５０ｍＶ程度に上昇したと
きに添加するのが良い。In the case of intermittent addition every predetermined period, the frequency of addition varies depending on the water system to be treated.
A sufficient effect can be obtained with an addition frequency of once every six months. In the case of intermittent addition based on the measured value of the natural potential of the copper-based material, the addition is preferably performed when the value increases to about 150 mV.
【００１５】本発明の銅系材質と鉄系材質の防食方法
は、銅系材質と鉄系材質とが共存する、開放又は密閉冷
却水系或いは蓄熱冷温水系の銅管等の腐食ないし孔食防
止に有効である。 The method for preventing corrosion of a copper-based material and an iron-based material according to the present invention is an open or closed cooling method in which a copper-based material and an iron-based material
却水system or Ru effective der corrosion or pitting prevention of copper pipe or the like of the heat storage cold water.
【００１６】[0016]
【作用】本発明の方法において、電位低下剤として用い
るグルタルアルデヒドは、銅系材質の自然電位を著しく
低下させることができ、また、銅イオンの溶出量を大幅
に低減することができる。In the method of the present invention, glutaraldehyde used as a potential lowering agent can significantly lower the natural potential of a copper-based material, and can significantly reduce the amount of copper ions eluted.
【００１７】このため、銅系材質の腐食ないし孔食は確
実に防止されると共に、鉄系材質の溶出銅イオンによる
腐食促進も防止される。[0017] Therefore, corrosion or pitting of the copper-based material is reliably prevented, and corrosion promotion due to eluted copper ions of the iron-based material is also prevented.
【００１８】[0018]
【実施例】以下に実施例及び比較例を挙げて、本発明を
より具体的に説明するが、本発明はその要旨を超えない
限り、以下の実施例に限定されるものではない。EXAMPLES The present invention will be described more specifically with reference to examples and comparative examples below, but the present invention is not limited to the following examples unless it exceeds the gist.
【００１９】実施例１〜３ 図１に示す如く、１リットル容のビーカー１の水中に浸
漬した銅試験片（半割銅管）２と飽和銀／塩化銀電極３
とに電位差計４を接続した試験装置を用い、グルタルア
ルデヒドを表１に示す割合で添加し、銅試験片の電位の
変化を経時的に測定した。結果を表１に示す。Examples 1 to 3 As shown in FIG. 1, a 1-liter beaker 1 was immersed in water in a copper test piece (half copper tube) 2 and a saturated silver / silver chloride electrode 3
Glutaraldehyde was added at the ratio shown in Table 1 using a test device connected to a potentiometer 4 and the change in the potential of the copper test piece was measured over time. Table 1 shows the results.
【００２０】また、鉄系材質に対する銅イオンの影響を
調べるために、実施例３において、７日間の試験終了
後、更に軟鋼試験片をビーカー内に浸漬して、２日間、
３０℃で回転させた。このときの水中の銅イオン濃度と
試験片の腐食減量を測定し、結果を表２に示した。In order to examine the effect of copper ions on the iron-based material, in Example 3, after the test was completed for 7 days, a mild steel test piece was further immersed in a beaker for 2 days.
Rotated at 30 ° C. At this time, the copper ion concentration in water and the corrosion loss of the test piece were measured, and the results are shown in Table 2.
【００２１】比較例１ グルタルアルデヒドを添加しなかったこと以外は実施例
３と同様に行なって、結果を表１及び表２に示した。Comparative Example 1 The procedure of Example 3 was repeated except that no glutaraldehyde was added, and the results are shown in Tables 1 and 2.
【００２２】比較例２ グルタルアルデヒドの代りに、トリルトリアゾール及び
６０％水加ヒドラジンを表１に示す割合で添加したこと
以外は実施例３と同様に行なって、結果を表１及び表２
に示した。Comparative Example 2 The procedure of Example 3 was repeated, except that tolyltriazole and 60% hydrazine hydrate were added in the proportions shown in Table 1 in place of glutaraldehyde.
It was shown to.
【００２３】表１，２より、次のことが明らかである。
本発明の方法によれば、銅系材質の自然電位を孔食発生
電位（１９０ｍＶ）以下に速やかに低下させることがで
き、腐食ないし孔食を有効に防止得る。しかも、溶出銅
イオン量を少なく抑えることができることから、鉄系材
質の腐食を加速することもない。From Tables 1 and 2, the following is clear.
According to the method of the present invention, the spontaneous potential of a copper-based material can be promptly reduced to a pitting potential (190 mV) or less, and corrosion or pitting can be effectively prevented. In addition, since the amount of eluted copper ions can be suppressed to a small value, corrosion of iron-based materials is not accelerated.
【００２４】これに対して、従来のトリルトリアゾール
とヒドラジンとの併用添加では、銅系材質の電位を低下
させることはできるが、溶出銅イオン量が多く、鉄系材
質の腐食速度を加速するため、好ましくない。On the other hand, the conventional combined use of tolyltriazole and hydrazine can lower the potential of the copper-based material, but increases the amount of eluted copper ions and accelerates the corrosion rate of the iron-based material. Is not preferred.
【００２５】[0025]
【表１】 [Table 1]
【００２６】[0026]
【表２】 [Table 2]
【００２７】[0027]
【発明の効果】以上詳述した通り、本発明の銅系材質と
鉄系材質の防食方法によれば、銅系材質及び鉄系材質が
共存する、開放又は密閉冷却水系或いは蓄熱冷温水系に
おいて、鉄系材質の腐食を加速することなく、孔食の進
行している銅系材質の電位を有効に低下させ、孔食によ
る貫通、漏水事故を確実に防止することができる。しか
も、本発明の方法によれば、少ない薬剤使用量にて長期
間効果を持続させることができ、工業的に極めて有利で
ある。As described above in detail, according to the method for preventing corrosion of copper-based material and iron-based material according to the present invention, in an open or closed cooling water system or a thermal storage cold / hot water system in which a copper-based material and an iron-based material coexist, Without accelerating the corrosion of the iron-based material, the potential of the copper-based material in which pitting is progressing can be effectively reduced, and the penetration by the pitting and the water leakage accident can be reliably prevented. Moreover, according to the method of the present invention, the effect can be maintained for a long period of time with a small amount of drug used, which is industrially extremely advantageous.
【図１】実施例及び比較例で用いた試験装置の説明図で
ある。FIG. 1 is an explanatory diagram of a test apparatus used in Examples and Comparative Examples.
１ ビーカー ２ 銅試験片 ３ 飽和銀／塩化銀電極 ４ 電位差計 DESCRIPTION OF SYMBOLS 1 Beaker 2 Copper test piece 3 Saturated silver / silver chloride electrode 4 Potentiometer
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭61−62597（ＪＰ，Ａ) 特開 昭63−99001（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C23F 11/00 - 11/18 C02F 5/10 ＪＩＣＳＴファイル（ＪＯＩＳ)────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-61-62597 (JP, A) JP-A-63-99001 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C23F 11/00-11/18 C02F 5/10 JICST file (JOIS)
Claims (1)
又は密閉冷却水系或いは蓄熱冷温水系に、グルタルアル
デヒドを５〜５００ｍｇ／ｌ間欠的に添加することによ
り、銅系材質の自然電位を低下させると共に、銅イオン
の溶出を防止することを特徴とする銅系材質と鉄系材質
の防食方法。1. An open state in which a copper-based material and an iron-based material coexist .
Alternatively , glutaraldehyde is added intermittently to a closed cooling water system or a heat storage cooling / heating water system in an amount of 5 to 500 mg / l .
Lowers the natural potential of copper-based materials and
Corrosion prevention method for copper-based material and iron-based material, characterized by preventing elution of water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24049192A JP3203797B2 (en) | 1992-09-09 | 1992-09-09 | Corrosion protection for copper and iron materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24049192A JP3203797B2 (en) | 1992-09-09 | 1992-09-09 | Corrosion protection for copper and iron materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0688261A JPH0688261A (en) | 1994-03-29 |
| JP3203797B2 true JP3203797B2 (en) | 2001-08-27 |
Family
ID=17060308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24049192A Expired - Fee Related JP3203797B2 (en) | 1992-09-09 | 1992-09-09 | Corrosion protection for copper and iron materials |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3203797B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105220159B (en) * | 2015-09-29 | 2017-12-15 | 中北大学 | A kind of corrosion inhibiter suitable for iron-based doctor solution |
-
1992
- 1992-09-09 JP JP24049192A patent/JP3203797B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0688261A (en) | 1994-03-29 |
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