JPS5828348B2 - Metal corrosion prevention method - Google Patents
Metal corrosion prevention methodInfo
- Publication number
- JPS5828348B2 JPS5828348B2 JP51157786A JP15778676A JPS5828348B2 JP S5828348 B2 JPS5828348 B2 JP S5828348B2 JP 51157786 A JP51157786 A JP 51157786A JP 15778676 A JP15778676 A JP 15778676A JP S5828348 B2 JPS5828348 B2 JP S5828348B2
- Authority
- JP
- Japan
- Prior art keywords
- corrosion
- metal corrosion
- corrosion prevention
- prevention method
- cooling water
- 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
Classifications
-
- 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
Description
【発明の詳細な説明】
本発明は冷却水系の水と接触する金属とくに鉄鋼の腐食
防止方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing corrosion of metals, particularly steel, that come into contact with water in a cooling water system.
従来、開放循環式冷却水系もしくは密閉式冷却水系など
では、水と接触する金属の腐食を防止するために、水溶
性腐食防止剤としてクロム酸塩、亜硝酸塩、リン酸塩、
亜鉛塩等を単独または組合せて使用してきた。Conventionally, in open circulation cooling water systems or closed cooling water systems, water-soluble corrosion inhibitors such as chromates, nitrites, phosphates, etc. have been used to prevent corrosion of metals that come into contact with water.
Zinc salts and the like have been used alone or in combination.
しかし、近年、クロム酸塩、亜硝酸塩、亜鉛塩等は毒性
を有するために、またリン酸塩は赤潮発生の原因物質と
して、それらの使用が制限されてきている。However, in recent years, the use of chromates, nitrites, zinc salts, etc. has been restricted because they are toxic, and phosphates are a causative agent of red tide.
また、低毒性の有機系腐食防止剤であるオキシカルボン
酸やザルコシンなどは、微生物により容易に分解され腐
食防止効果を持続させ難い。Furthermore, low toxicity organic corrosion inhibitors such as oxycarboxylic acid and sarcosine are easily decomposed by microorganisms, making it difficult to maintain their corrosion inhibiting effect.
現在、それらにかわる無公害の腐食防止剤が強く要望さ
れている。Currently, there is a strong demand for non-polluting corrosion inhibitors to replace them.
本発明者らは、ポリアクリル酸塩が低毒性でかつ生分解
性の低いことに着目し、ポリアクリル酸塩の腐食防止作
用を検討したところ分子量が腐食防止作用に重要な影響
をもたらすことを見出し、本発明を完成した。The present inventors focused on the low toxicity and low biodegradability of polyacrylates, and investigated the corrosion-inhibiting effect of polyacrylates, and found that the molecular weight has an important effect on the corrosion-inhibiting effect. The present invention has been completed.
すなわち、本発明は前記従来の腐食防止剤のうち、特に
望ましくない物質であるクロムまたはリンを含む化合物
を使用することなく、冷却水系の水と接触する金属の腐
食防止を行う方法を提案することを目的とし、分子量が
１０００以下のポリアクリル酸またはその水溶性塩を冷
却水系にｌＯＯ淋以上添加し、クロムまたはリンを含む
化合物を添加することなく腐食防止を行うことを特徴と
する金属腐食防止方法を要旨とするものである。That is, the present invention proposes a method for preventing corrosion of metals that come into contact with water in a cooling water system without using compounds containing chromium or phosphorus, which are particularly undesirable substances among the conventional corrosion inhibitors. A method for preventing metal corrosion, which is characterized by adding polyacrylic acid or a water-soluble salt thereof having a molecular weight of 1000 or less to a cooling water system to prevent corrosion without adding compounds containing chromium or phosphorus. The gist is the method.
本発明に使用するポリアクリル酸の分子量は１０００以
下、好ましくは約５００〜９００であり、この範囲で優
れた防食効果を示す。The molecular weight of the polyacrylic acid used in the present invention is 1000 or less, preferably about 500 to 900, and exhibits excellent anticorrosion effects within this range.
分子量が１０００より大きいポリアクリル酸は通常スケ
ール防止剤として知られているが、このような分子量に
なると防食効果は著しく低下し、特にスケール防止剤と
して実用化されている分子量５０００〜１００００のポ
リアクリル酸では防食効果は悪い。Polyacrylic acid with a molecular weight larger than 1000 is usually known as a scale inhibitor, but when it reaches such a molecular weight, the anticorrosive effect is significantly reduced. Acid has poor anticorrosion effect.
また、アクリル酸モノマーは防食効果を殆ど示さない。Furthermore, acrylic acid monomers exhibit almost no anticorrosion effect.
本発明のポリアクリル酸はそのままでも使用できるが、
より溶解性のよい水溶性塩の形で使用するＤが好ましく
、例えばナトリウム、カリウムまたはアンモニウム塩で
使用する。Although the polyacrylic acid of the present invention can be used as it is,
D is preferably used in the form of a water-soluble salt with better solubility, for example as a sodium, potassium or ammonium salt.
このようなポリアクリル酸またはその水溶性塩を冷却水
系に１００−以上添加し、クロムまたはリンを含む化合
物を添加することなく、冷却水系の水と接触する金属の
腐食防止を行う。By adding 100% or more of such polyacrylic acid or a water-soluble salt thereof to a cooling water system, corrosion of metals that come into contact with water in the cooling water system can be prevented without adding compounds containing chromium or phosphorus.
クロムまたはリンを含む化合物としてはクロム酸（塩）
、リン酸（塩）、ホスホン酸（塩）などがあるが、これ
らの化合物以外の化合物は必要により併用することがで
きる。Chromic acid (salt) as a compound containing chromium or phosphorus
, phosphoric acid (salt), phosphonic acid (salt), etc., but compounds other than these compounds can be used in combination if necessary.
例えば防食効果をより改善する目的でモリブデン酸塩、
亜鉛塩、ニッケル塩などの無機防食剤やアミン類、アミ
ド類などの有機防食剤を併用することができるし、また
防食すべき系が種々の金属からなっているときには特定
金属の防食剤を併用でき、例えば鋼材が存在する系では
ベンゾトリアゾール、ベンゾチアゾールなどの防食剤を
併用することができる。For example, molybdate for the purpose of further improving the anticorrosion effect.
Inorganic anticorrosive agents such as zinc salts and nickel salts and organic anticorrosive agents such as amines and amides can be used together, and when the system to be protected against corrosion is made up of various metals, anticorrosive agents for specific metals can be used in combination. For example, in systems where steel materials are present, anticorrosive agents such as benzotriazole and benzothiazole can be used in combination.
さらに、ポリアクリル酸とともにスライムコントロール
剤、スケール防止剤なども併用することができる。Furthermore, slime control agents, scale inhibitors, and the like can be used together with polyacrylic acid.
以上の本発明による金属腐食防止方法は防食効果が優れ
ていて、クロムまたはリンを含む化合物を使用しなくて
も、ポリアクリル酸またはその水溶性塩の単独添加で、
十分冷却水系の腐食防止を行うことができ、しかも添加
されるポリアクリル酸またはその水溶性塩は生分解性が
低く防食作用が持続し、かつ低毒性である特長を持って
いる。The above-described method for preventing metal corrosion according to the present invention has an excellent corrosion-preventing effect, and can be achieved by adding polyacrylic acid or its water-soluble salt alone without using compounds containing chromium or phosphorus.
It can sufficiently prevent corrosion of the cooling water system, and the added polyacrylic acid or its water-soluble salt has low biodegradability, long-lasting anticorrosive action, and low toxicity.
以下に本発明の実施例を示す。Examples of the present invention are shown below.
実施例
各種分子量のポリアクリル酸塩を固形分濃度として１０
０ｐＩｎまたは２００ｐｐｆｆｉ添加した浴底に、軟鋼
試験片を浸漬し、２０時間後の腐食量を測定した。Examples Polyacrylates of various molecular weights with a solid concentration of 10
A mild steel test piece was immersed in the bath bottom to which 0 pIn or 200 ppffi had been added, and the amount of corrosion after 20 hours was measured.
この結果から腐食抑制率を求めて表＝１に示した。From this result, the corrosion inhibition rate was determined and shown in Table 1.
ここで腐食抑制率とは、薬剤を添加しない場合の腐食量
（９ｚｍｙ／３ｓｉ）から薬剤を添加した場合の腐食量
を引いた値を薬剤を添加しない場合の腐食量で除し、１
００倍したものである。Here, the corrosion inhibition rate is the value obtained by subtracting the amount of corrosion when adding a chemical from the amount of corrosion when adding no chemical (9zmy/3si), divided by the amount of corrosion when adding no chemical, and 1
It is multiplied by 00.
また、アクリル酸モノマーを５００ ｐｐｍ添加して同
様に防食試験をしたところ腐食抑制率は８％であり、さ
らに分子量１ｏｏｏ以下のポリアクリル酸塩を５０ｐＦ
添加して同条件で試験したところ、腐食抑制率は一３９
％であり、いずれも腐食防止効果は認められなかった。In addition, when 500 ppm of acrylic acid monomer was added and a similar corrosion prevention test was conducted, the corrosion inhibition rate was 8%, and furthermore, polyacrylate with a molecular weight of 100 or less was added to 50 pF.
When added and tested under the same conditions, the corrosion inhibition rate was -39.
%, and no corrosion prevention effect was observed in either case.
Claims (1)
水溶性塩を冷却水系に１００−以上添加し、クロムまた
はリンを含む化合物を添加することなく腐食防止を行う
ことを特徴とする金属腐食防止方法。1. A method for preventing metal corrosion, which comprises adding polyacrylic acid or a water-soluble salt thereof having a molecular weight of 100 or less to a cooling water system to prevent corrosion without adding a compound containing chromium or phosphorus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP51157786A JPS5828348B2 (en) | 1976-12-27 | 1976-12-27 | Metal corrosion prevention method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP51157786A JPS5828348B2 (en) | 1976-12-27 | 1976-12-27 | Metal corrosion prevention method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5386653A JPS5386653A (en) | 1978-07-31 |
| JPS5828348B2 true JPS5828348B2 (en) | 1983-06-15 |
Family
ID=15657255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP51157786A Expired JPS5828348B2 (en) | 1976-12-27 | 1976-12-27 | Metal corrosion prevention method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5828348B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002371387A (en) * | 2001-06-15 | 2002-12-26 | Aquas Corp | Composition for preventing corrosion |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5884099A (en) * | 1981-11-05 | 1983-05-20 | ナルコ・ケミカル・カンパニ− | Carboxylate polymer for scale control agent of interior in boiler system |
| JPS59222588A (en) * | 1983-05-31 | 1984-12-14 | Nippon Nohyaku Co Ltd | Water treating agent |
| US6379587B1 (en) | 1999-05-03 | 2002-04-30 | Betzdearborn Inc. | Inhibition of corrosion in aqueous systems |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5021951A (en) * | 1973-06-04 | 1975-03-08 |
-
1976
- 1976-12-27 JP JP51157786A patent/JPS5828348B2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5021951A (en) * | 1973-06-04 | 1975-03-08 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002371387A (en) * | 2001-06-15 | 2002-12-26 | Aquas Corp | Composition for preventing corrosion |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5386653A (en) | 1978-07-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4246030A (en) | Corrosion inhibiting compositions and the process for using same | |
| US4138353A (en) | Corrosion inhibiting composition and process of using same | |
| US3933427A (en) | Process for preventing corrosion and the formation of scale in water circulating system | |
| CA1222749A (en) | Process of inhibiting corrosion of metal surfaces and/or deposition of scale thereon | |
| US4184991A (en) | Corrosion inhibiting composition for ferrous metals and method of treating with same | |
| US4018701A (en) | Phosphorous acid and zinc corrosion inhibiting compositions and methods for using same | |
| US4664884A (en) | Corrosion inhibitor | |
| US4057511A (en) | Process for preventing corrosion and the formation of scale in water circulating system | |
| CA1309854C (en) | Inhibiting corrosion of iron base metals | |
| US4502978A (en) | Method of improving inhibitor efficiency in hard waters | |
| JPS5937750B2 (en) | metal corrosion inhibitor | |
| JPS5828348B2 (en) | Metal corrosion prevention method | |
| US4806310A (en) | Corrosion inhibitor | |
| JPS58189380A (en) | Treatment for aqueous systems | |
| KR100310168B1 (en) | Antiscaling agent and method for treating water using the same | |
| JPS589832B2 (en) | metal corrosion inhibitor | |
| US20010022947A1 (en) | Corrosion inhibition method suitable for use in potable water | |
| JPH0125825B2 (en) | ||
| US5068059A (en) | Corrosion inhibitor | |
| US4329250A (en) | Low level chromate-based corrosion inhibition in aqueous mediums | |
| JPS59222589A (en) | Corrosion inhibitor of metals | |
| US4297317A (en) | Low level chromate-based corrosion inhibition in aqueous mediums | |
| JP2730740B2 (en) | Corrosion inhibitor for circulating water piping system for cooling | |
| JP3169505B2 (en) | Metal anticorrosive and metal anticorrosion method | |
| JPS5839233B2 (en) | Corrosion prevention method for steel surfaces underwater |