JPH0637709B2 - Corrosion inhibitor - Google Patents
Corrosion inhibitorInfo
- Publication number
- JPH0637709B2 JPH0637709B2 JP25050287A JP25050287A JPH0637709B2 JP H0637709 B2 JPH0637709 B2 JP H0637709B2 JP 25050287 A JP25050287 A JP 25050287A JP 25050287 A JP25050287 A JP 25050287A JP H0637709 B2 JPH0637709 B2 JP H0637709B2
- Authority
- JP
- Japan
- Prior art keywords
- acid
- inhibitor
- iron
- corrosion inhibitor
- corrosion
- 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
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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/04—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors
- C23G1/06—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors
- C23G1/065—Cleaning or pickling metallic material with solutions or molten salts with acid solutions using inhibitors organic inhibitors sulfur-containing compounds
Description
【発明の詳細な説明】 イ）産業上の利用分野 本発明は鉄系金属の腐食抑制剤に関するものであり、更
に詳しくは一般式 ［式中ｍは０〜５，ｎは２〜３である］ で示される化合物による、酸性下における鉄系金属の腐
食抑制剤に関するものである。TECHNICAL FIELD The present invention relates to a corrosion inhibitor for iron-based metals, more specifically a general formula [In the formula, m is 0 to 5, and n is 2 to 3] The present invention relates to a corrosion inhibitor for iron-based metals under acidic conditions.
ロ）従来技術 従来、鉄系金属の酸処理には、鉄やステンレス鋼の製造
時に行われる酸洗いや化学プラント、火力発電用大型ボ
イラー、各種熱交換器等の化学洗浄などが挙げられ、い
ずれも金属に付着したスケールを除去することを目的と
して行われている。使用される酸も、使用場面によって
各種各様で、例えば無機酸としては、塩酸、硫酸、燐
酸、弗酸、スルファミン酸等があり、有機酸としては、
酢酸、クエン酸、乳酸、シュウ酸、コハク酸、酒石酸、
ギ酸、ヒドロキシ酢酸、モノクロル酢酸、リンゴ酸、チ
オリンゴ酸、プロピオン酸、チオグリコール酸、クロル
プロピオン酸、エチレンジアミン四酢酸等が挙げられ
る。B) Conventional technology Conventionally, the acid treatment of iron-based metals includes pickling performed during the production of iron and stainless steel, chemical plants, large boilers for thermal power generation, chemical cleaning of various heat exchangers, etc. Is also carried out for the purpose of removing the scale attached to the metal. There are various kinds of acids to be used depending on the use scene, for example, inorganic acids include hydrochloric acid, sulfuric acid, phosphoric acid, hydrofluoric acid, sulfamic acid, etc., and organic acids include
Acetic acid, citric acid, lactic acid, oxalic acid, succinic acid, tartaric acid,
Formic acid, hydroxyacetic acid, monochloroacetic acid, malic acid, thiomalic acid, propionic acid, thioglycolic acid, chloropropionic acid, ethylenediaminetetraacetic acid and the like can be mentioned.
これらの酸による脱スケールは、スケールのみを溶解さ
せるかまたは、スケールを剥離させ、素地金属の溶解を
最小限にすることが理想でこのために通常、腐食抑制剤
（以下インヒビターと称す）が添加されている。熱処理
した鉄の表面には、α−Ｆｅ2Ｏ3（ヘマタイト）やＦｅ
3Ｏ4（マグネタイト）やＦｅＯ（ビスタイト）といった
鉄酸化物が形成されるため、通常１０〜１５％塩酸下４
０〜５０℃でスケールの溶解除去が行われている。Descaling with these acids ideally dissolves only the scale or exfoliates the scale and minimizes the dissolution of the base metal. For this reason, a corrosion inhibitor (hereinafter referred to as an inhibitor) is usually added. Has been done. On the surface of heat-treated iron, α-Fe 2 O 3 (hematite) and Fe
Since iron oxides such as 3 O 4 (magnetite) and FeO (bistite) are formed, it is usually 10 to 15% under hydrochloric acid.
The scale is dissolved and removed at 0 to 50 ° C.
この際、素地金属の溶解を阻止するためにインヒビター
を酸液に対して０．１〜３％程度添加している。インヒ
ビターの抑制機構としては、有機化合物の窒素、酸素、
リン、イオウなどのヘテロ原子が素地金属のみに吸着
し、スケールには、ほとんど吸着しないことから、脱ス
ケールの速度に影響することなく素地金属の溶解を抑制
すると考えられている。At this time, in order to prevent dissolution of the base metal, an inhibitor is added in an amount of about 0.1 to 3% with respect to the acid solution. As the inhibitor suppression mechanism, organic compounds such as nitrogen, oxygen,
Since heteroatoms such as phosphorus and sulfur are adsorbed only on the base metal and hardly adsorbed on the scale, it is considered that the dissolution of the base metal is suppressed without affecting the rate of descaling.
ハ）発明が解決しようとする問題点 現在使用されているインヒビターとしては、牛脂アミ
ン、ステアリルアミン、ラウリルアミン等のアルキルア
ミン、ジエチルチオウレア、ジブチルチオウレア、ジフ
ェニルチオウレア、エチレンチオウレア等のチオウレア
系化合物、ベンゾチアゾール、２−メルカプトベンゾチ
アゾール等のチアゾール系化合物、エチレンオキサイド
を付加させたポリエチレングリコール型の界面活性剤な
どが挙げられる。C) Problems to be solved by the invention As inhibitors currently used, alkylamines such as beef tallow amine, stearylamine and laurylamine, thiourea compounds such as diethylthiourea, dibutylthiourea, diphenylthiourea and ethylenethiourea, benzo Examples thereof include thiazole compounds such as thiazole and 2-mercaptobenzothiazole, and polyethylene glycol type surfactants to which ethylene oxide is added.
これら脱スケールの全体的な問題として、工程のスピー
ド化が挙げられ、この酸洗いにおいても８０〜１００℃
と高温処理が望まれており、インヒビター性能も、より
高度なものが要求されている。The overall problem of descaling is speeding up of the process, and even in this pickling, the temperature is 80 to 100 ° C.
Therefore, high-temperature treatment is desired, and higher inhibitor performance is required.
ニ）発明の構成 本発明者らは、鋭意研究の結果、ベンゼン環にチオシア
ナートを２〜３残基導入された化合物、またはアルキレ
ンチオシアナートを２〜３残基導入された化合物が、従
来のインヒビターでは、予想され得ない抑制効果を発揮
することを見出し、本発明に至った。本発明の化合物を
例示すると、ｏ−フェニレンビス（メチルチオシアナー
ト）、ｍ−フェニレンビス（メチルチオシアナート）、
ｐ−フェニレンビス（メチルチオシアナート）、ｐ−フ
ェニレンビス（１，２−エタンジイルチオシアナー
ト）、ｐ−フェニレンビス（１，４−ブタンジイルチオ
シアナート）等があげられる。D) Structure of the invention As a result of earnest research, the inventors of the present invention have found that a compound having a thiocyanate of 2 to 3 residues introduced into a benzene ring or a compound having an alkylene thiocyanate of 2 to 3 residues introduced thereinto has a conventional structure. The present inventors have found that an inhibitor exerts an unexpected inhibitory effect, and completed the present invention. Examples of the compound of the present invention include o-phenylene bis (methyl thiocyanate), m-phenylene bis (methyl thiocyanate),
Examples thereof include p-phenylenebis (methylthiocyanate), p-phenylenebis (1,2-ethanediylthiocyanate), p-phenylenebis (1,4-butanediylthiocyanate) and the like.
ホ）作用 本発明の化合物は、酸液に対し、０．０１〜５０重量パ
ーセント、好ましくは、０．０５〜１重量パーセント添
加することにより、低温ではもちろんのこと、高温にお
いても安定に鉄系金属の素地溶解を抑制することができ
るものである。(E) Action The compound of the present invention is added to the acid solution in an amount of 0.01 to 50% by weight, preferably 0.05 to 1% by weight, so that the iron-based compound is stable not only at low temperature but also at high temperature. It is possible to suppress the dissolution of the metal matrix.
本発明のインヒビターは公知のインヒビターと併用して
も差し支えなく、可溶化または製剤化するための必要な
薬剤と混合して使用されることも、なんら差し支えな
い。The inhibitor of the present invention may be used in combination with a known inhibitor, and may be used in admixture with a necessary drug for solubilization or formulation.
ヘ）実施例 以下、実施例を挙げて、本発明の有効性を説明する。F) Examples Hereinafter, the effectiveness of the present invention will be described with reference to examples.
テストピースとして鉄（ＳＰＣＣ）５０×１０×１mmを
使用し、耐水研磨紙＃３２０で研磨後、アセトンで脱
脂、乾燥して使用する。Iron (SPCC) 50 × 10 × 1 mm is used as a test piece, and after polishing with water resistant polishing paper # 320, degreasing with acetone and drying are used.
試験液としては最も広範に使用されている１０％塩酸、
１０％硫酸、１０％酢酸を使用し、８０℃において所定
濃度のインヒビター添加量で実施する。10% hydrochloric acid, which is the most widely used test solution,
It is carried out using 10% sulfuric acid and 10% acetic acid at 80 ° C. with a predetermined concentration of the inhibitor added.
なお、腐食を促進させるため、各酸液には、Ｆｅ2+５０
g／lを添加しておく。In addition, in order to promote corrosion, each acid solution contains Fe 2+ 50
Add g / l.
比較例としては、無添加、ジエチルチオウレア、ジブチ
ルチオウレア、ベンジルチオシアナート、市販のインヒ
ビター（イビット＃７００：住友化学工業株式会社製）
を使用した。As comparative examples, additive-free, diethyl thiourea, dibutyl thiourea, benzyl thiocyanate, commercially available inhibitor (Ibit # 700: manufactured by Sumitomo Chemical Co., Ltd.)
It was used.
腐食抑制率（％）は下記式にて算出した。The corrosion inhibition rate (%) was calculated by the following formula.
腐食抑制率（％）＝（Ａ−Ｂ）／Ａ×１００ Ａ：インヒビター無添加の際の腐食減量 Ｂ：インヒビター添加時の際の腐食減量 ト）発明の効果 以上の実施例、比較例からベンゼン環にチオシアナート
またはアルキレンチオシアナートを２ないし３残基導入
した化合物は、鉄系金属の腐食抑制剤として有用である
ことが判明した。Corrosion inhibition rate (%) = (A−B) / A × 100 A: Corrosion weight loss when inhibitor is not added B: Corrosion weight loss when inhibitor is added G) Effect of the invention From the above Examples and Comparative Examples, it was revealed that the compound in which two or three residues of thiocyanate or alkylene thiocyanate were introduced into the benzene ring was useful as a corrosion inhibitor for iron-based metals.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25050287A JPH0637709B2 (en) | 1987-10-02 | 1987-10-02 | Corrosion inhibitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25050287A JPH0637709B2 (en) | 1987-10-02 | 1987-10-02 | Corrosion inhibitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0192388A JPH0192388A (en) | 1989-04-11 |
| JPH0637709B2 true JPH0637709B2 (en) | 1994-05-18 |
Family
ID=17208834
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25050287A Expired - Lifetime JPH0637709B2 (en) | 1987-10-02 | 1987-10-02 | Corrosion inhibitor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0637709B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6050113B2 (en) * | 2010-06-30 | 2016-12-21 | Ykk株式会社 | Slide fastener and manufacturing method of slide fastener |
-
1987
- 1987-10-02 JP JP25050287A patent/JPH0637709B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6050113B2 (en) * | 2010-06-30 | 2016-12-21 | Ykk株式会社 | Slide fastener and manufacturing method of slide fastener |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0192388A (en) | 1989-04-11 |
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