JP3202489B2 - Metal rust inhibitor - Google Patents
Metal rust inhibitorInfo
- Publication number
- JP3202489B2 JP3202489B2 JP17064094A JP17064094A JP3202489B2 JP 3202489 B2 JP3202489 B2 JP 3202489B2 JP 17064094 A JP17064094 A JP 17064094A JP 17064094 A JP17064094 A JP 17064094A JP 3202489 B2 JP3202489 B2 JP 3202489B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- rust
- rust inhibitor
- phosphoric acid
- aqueous solution
- 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
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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は淡水中における鉄鋼や亜
鉛等の金属の腐食を効果的に抑制するための金属防錆剤
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal rust inhibitor for effectively suppressing corrosion of metals such as steel and zinc in fresh water.
【０００２】[0002]
【従来の技術】液化プロパンガス運搬船の貯蔵タンクに
は鉄鋼材が使用されており、これらのタンクは完成時に
水圧試験あるいは水荷重試験を行って構造、基礎、バラ
ンス等の検査を行っている。液化プロパンガスを貯蔵す
るタンクは巨大なものが多く、水圧試験あるいは水荷重
試験を行う場合、数千トンから数万トンにも及ぶ水量を
使用することがある。したがって鉄鋼タンクに注水、排
水する時間も含めて水が鉄鋼と接している時間も長く数
週間を要することもある。2. Description of the Related Art Steel tanks are used for storage tanks of liquefied propane gas carriers. When completed, these tanks are subjected to a hydraulic test or a water load test to inspect the structure, foundation, balance and the like. Many tanks for storing liquefied propane gas are enormous, and when a hydraulic test or a water load test is performed, an amount of water ranging from thousands to tens of thousands of tons may be used. Therefore, the time during which water is in contact with steel, including the time to inject and drain water into the steel tank, may be long, requiring several weeks.
【０００３】鉄鋼タンクの各種試験に上水道水、工業用
水をそのまま使用した場合、タンク全面が腐食して赤錆
を発生するが、特に水線部や溶接線近傍の腐食は激しく
なる。これらの腐食程度は水質、水との接触時間、水温
等によっても異なるが、局部腐食等によって侵食した場
合、構造上重大な影響を与えるので品質管理上からも重
要である。また液化プロパンガスが貯蔵されるタンクに
あっては、腐食によって生成した鉄水酸化物が剥落する
ことによって液化ガスを移送するポンプのフィルタ目詰
り及びポンプの焼付等の重大な障害を与えることが指摘
されている。大容量のタンクにおいては、水圧あるいは
水荷重試験に使用した水を排出した後のタンク内手直
し、清掃を行うことは莫大な設備と工数を要するため、
殆んど不可能に近いといわれており、この工程における
防食対策はタンク内清浄化の上から重要な問題である。When tap water or industrial water is used as it is for various tests on steel tanks, the entire surface of the tank is corroded and red rust is generated. In particular, corrosion near the water line and the weld line becomes severe. The degree of these corrosions varies depending on water quality, contact time with water, water temperature, and the like. However, when eroded by local corrosion or the like, it has a significant structural effect and is important from the viewpoint of quality control. Also, in the tank where liquefied propane gas is stored, the iron hydroxide generated by the corrosion may fall off, causing serious obstacles such as clogging of the filter for transferring the liquefied gas and burning of the pump. It is pointed out. In large-capacity tanks, repairing and cleaning the tank after draining water used for water pressure or water load tests requires enormous equipment and man-hours,
It is said that it is almost impossible, and anticorrosion measures in this process are an important problem from the viewpoint of cleaning the inside of the tank.
【０００４】従来、水と接触する鉄鋼タンク内の防錆に
は燐酸三ナトリウム、１５％ポリ燐酸及び燐酸との配合
水溶液や、その他重合燐酸塩を主体とした種々の水溶性
防錆剤が使用されているが、何れも３０日間以上長期に
水と接触していると防錆液が濁り沈積してくるため、排
出した後の清掃を必要とする欠点があった。Conventionally, an aqueous solution containing trisodium phosphate, 15% polyphosphoric acid and phosphoric acid, and various other water-soluble rust inhibitors mainly composed of polymerized phosphate have been used for rust prevention in a steel tank which comes into contact with water. However, any of them has a drawback that when they are in contact with water for 30 days or more, the rust preventive liquid becomes turbid and deposits, so that cleaning after discharging is required.
【０００５】[0005]
【発明が解決しようとする課題】本発明は以上の諸点に
鑑み、長期防錆性に富み、かつ防錆液の透明度を維持す
る鉄鋼や亜鉛等の金属用防錆剤を提供しようとするもの
である。SUMMARY OF THE INVENTION In view of the above problems, the present invention is to provide a rust preventive agent for metals such as steel and zinc, which is rich in long-term rust prevention and maintains the transparency of rust prevention liquid. It is.
【０００６】[0006]
【課題を解決するための手段】本発明は金属面に接触す
る水溶液に添加する金属防錆剤であって、燐酸三ナトリ
ウム（無水）：１０〜２０ｗ／ｖ％、重合燐酸塩：５〜
１５ｗ／ｖ％及び１−ヒドロキシエチリデン−１，１−
ジホスホン酸：１０〜１５ｗ／ｖ％の水溶液に、燐酸を
加えてｐＨ：５〜７に調整してなることを特徴とする金
属防錆剤である。SUMMARY OF THE INVENTION The present invention relates to a metal rust inhibitor to be added to an aqueous solution which comes into contact with a metal surface. The metal rust inhibitor is trisodium phosphate (anhydrous): 10 to 20 w / v%, and polymerized phosphate: 5 to 5%.
15% w / v and 1-hydroxyethylidene-1,1-
Diphosphonic acid: a metal rust inhibitor characterized by being adjusted to pH 5 to 7 by adding phosphoric acid to an aqueous solution of 10 to 15 w / v%.
【０００７】本発明でいう重合燐酸塩としてはピロ燐酸
カリウム、トリポリ燐酸ナトリウム、トリポリ燐酸カリ
ウム、テトラポリ燐酸ナトリウム、テトラポリ燐酸カリ
ウム、ヘキサポリ燐酸ナトリウム、ヘキサポリ燐酸カリ
ウム、ヘキサメタ燐酸ナトリウム、ヘキサメタ燐酸カリ
ウム、ウルトラ燐酸ナトリウム等が使用できる。The polymerized phosphates referred to in the present invention include potassium pyrophosphate, sodium tripolyphosphate, potassium tripolyphosphate, sodium tetrapolyphosphate, potassium tetrapolyphosphate, sodium hexapolyphosphate, potassium hexapolyphosphate, sodium hexametaphosphate, potassium hexametaphosphate, and ultraphosphate. Sodium or the like can be used.
【０００８】防食剤の配合比は燐酸三ナトリウム（無
水）：１０〜２０ｗ／ｖ％、重合燐酸塩：５〜１５ｗ／
ｖ％及び１−ヒドロキシエチリデン−１，１−ジホスホ
ン酸：１０〜１５ｗ／ｖ％の範囲内で配合した水溶液に
燐酸を加えてｐＨ５〜７になるよう調合する。このよう
に配合及び調合された防錆用溶液を１００％溶液とみな
し、金属面に接触する水溶液中に２００〜５００ｍｇ／
リットルの濃度で添加して防食を行う。添加濃度が２０
０ｍｇ／リットル未満では長期間の防錆時に防食液が濁
るなどして効果が期待できないし、５００ｍｇ／リット
ルを越えると無駄になるが悪影響はない。The compounding ratio of the anticorrosive is as follows: trisodium phosphate (anhydrous): 10 to 20 w / v%, polymerized phosphate: 5 to 15 w / v
v% and 1-hydroxyethylidene-1,1-diphosphonic acid: Phosphoric acid is added to an aqueous solution blended in the range of 10 to 15 w / v% to make a pH of 5 to 7. The rust preventive solution thus formulated and prepared is regarded as a 100% solution, and 200 to 500 mg /
It is added at a concentration of 1 liter to prevent corrosion. Addition concentration is 20
If the amount is less than 0 mg / liter, the anticorrosive solution becomes turbid during long-term rust prevention, so that no effect can be expected. If it exceeds 500 mg / liter, there is no waste but no adverse effect.
【０００９】[0009]
【作用】本発明の防錆剤を金属面と接触する水溶液に添
加すると、金属面に不動態化された安定な燐酸皮膜を形
成し、該皮膜が金属面の腐食を防止、抑制する。また燐
酸三ナトリウム、重合燐酸塩、１−ヒドロキシエチリデ
ン−１，１−ジホスホン酸、燐酸のそれぞれ単独では防
錆機能をほとんど期待できないが、燐酸三ナトリウム、
重合燐酸塩及び１−ヒドロキシエチリデン−１，１−ホ
スホン酸と適量配合した水溶液に燐酸を加えてｐＨ調整
することで、燐酸皮膜形成に必要最適な遊離燐酸を維持
し、燐酸皮膜の形成を助長、促進する。また重合燐酸塩
と有機キレート化合物である１−ヒドロキシエチリデン
−１，１−ジホスホン酸との相乗効果で溶出金属イオン
のキレート化、皮膜形成時の沈殿防止、微粉体の分散及
び多くのカチオンを効果的にキレート化するので金属面
には緻密で防食性に富んだ安定な皮膜が形成され、長期
間にわたって発錆を抑制するばかりでなく、防錆液の濁
りも抑制される。When the rust inhibitor of the present invention is added to an aqueous solution that comes into contact with a metal surface, a stable passivated phosphoric acid film is formed on the metal surface, and the film prevents and suppresses corrosion of the metal surface. In addition, trisodium phosphate, polymerized phosphate, 1-hydroxyethylidene-1,1-diphosphonic acid, and phosphoric acid alone can hardly be expected to have a rust preventive function, but trisodium phosphate,
By adjusting the pH by adding phosphoric acid to an aqueous solution in which an appropriate amount of the polymerized phosphate and 1-hydroxyethylidene-1,1-phosphonic acid are blended, the optimum free phosphoric acid necessary for forming the phosphoric acid film is maintained and the formation of the phosphoric acid film is promoted. ,Facilitate. In addition, the synergistic effect of polymerized phosphate and 1-hydroxyethylidene-1,1-diphosphonic acid, an organic chelating compound, is effective for chelating eluting metal ions, preventing precipitation during film formation, dispersing fine powder, and effecting many cations. As a result, a stable film having a dense and rich anticorrosion property is formed on the metal surface, and not only rust generation is suppressed for a long period of time, but also turbidity of the rust preventive liquid is suppressed.
【００１０】[0010]
【実施例】上水道水５００ｍｌに、下記表１に示す燐酸
三ナトリウム、重合燐酸塩及び１−ヒドロキシエチリデ
ン−１，１−ジホスホン酸の水溶液に燐酸を加えてｐＨ
調整してなる防錆剤を添加し、表面を研磨した試験片
（材質：ＳＳ４１鋼板，寸法：１００×５０×１ｍｍ）
を浸漬して開放、常温状態で３０日間放置した後の錆発
生、表面状況及び防錆液の濁り状況を目視判定し、表１
の如き結果を得た。（防錆剤無添加につき同条件で行っ
た試験結果を併記する。）EXAMPLE To 500 ml of tap water, phosphoric acid was added to an aqueous solution of trisodium phosphate, polymerized phosphate and 1-hydroxyethylidene-1,1-diphosphonic acid shown in Table 1 below to obtain a pH.
A test piece (Material: SS41 steel plate, dimensions: 100 × 50 × 1 mm) to which the adjusted rust inhibitor was added and the surface was polished
After immersion and opening, standing at room temperature for 30 days, rust generation, surface condition and turbidity of the rust preventive liquid were visually judged.
The following results were obtained. (The results of a test performed under the same conditions without the addition of a rust inhibitor are also shown.)
【００１１】[0011]
【表１】 [Table 1]
【００１２】[0012]
【発明の効果】本発明の防錆剤は鉄鋼や亜鉛等の金属に
対し長期防錆性に富み、かつ防錆液の透明度を維持する
ことができるので、金属面に防錆剤が析出したり、浮遊
物などが付着することもない。The rust preventive of the present invention is rich in long-term rust preventive properties against metals such as steel and zinc and can maintain the transparency of the rust preventive liquid. Also, there is no attachment of floating substances.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭53−57148（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C23F 11/167 C23F 11/18 102 B65D 90/00,90/22 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-53-57148 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C23F 11/167 C23F 11/18 102 B65D 90 / 00,90 / 22
Claims (1)
防錆剤であって、燐酸三ナトリウム（無水）：１０〜２
０ｗ／ｖ％、重合燐酸塩：５〜１５ｗ／ｖ％及び１−ヒ
ドロキシエチリデン−１，１−ジホスホン酸：１０〜１
５ｗ／ｖ％の水溶液に、燐酸を加えてｐＨ：５〜７に調
整してなることを特徴とする金属防錆剤。1. A metal rust inhibitor to be added to an aqueous solution in contact with a metal surface, comprising trisodium phosphate (anhydrous): 10 to 2
0 w / v%, polymerized phosphate: 5 to 15 w / v%, and 1-hydroxyethylidene-1,1-diphosphonic acid: 10 to 1
A metal rust preventive, which is prepared by adding phosphoric acid to a 5 w / v% aqueous solution to adjust the pH to 5 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17064094A JP3202489B2 (en) | 1994-07-22 | 1994-07-22 | Metal rust inhibitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17064094A JP3202489B2 (en) | 1994-07-22 | 1994-07-22 | Metal rust inhibitor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0835084A JPH0835084A (en) | 1996-02-06 |
| JP3202489B2 true JP3202489B2 (en) | 2001-08-27 |
Family
ID=15908628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17064094A Expired - Fee Related JP3202489B2 (en) | 1994-07-22 | 1994-07-22 | Metal rust inhibitor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3202489B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113667984B (en) * | 2020-05-13 | 2023-08-22 | 上海蓝浦清洗技术有限公司 | Corrosion inhibitor and pipeline corrosion inhibitor film coating device |
-
1994
- 1994-07-22 JP JP17064094A patent/JP3202489B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0835084A (en) | 1996-02-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20010522 |
|
| LAPS | Cancellation because of no payment of annual fees |