JPS60262984A - Chemical cleaning liquid for titanium heat exchanger - Google Patents
Chemical cleaning liquid for titanium heat exchangerInfo
- Publication number
- JPS60262984A JPS60262984A JP11818084A JP11818084A JPS60262984A JP S60262984 A JPS60262984 A JP S60262984A JP 11818084 A JP11818084 A JP 11818084A JP 11818084 A JP11818084 A JP 11818084A JP S60262984 A JPS60262984 A JP S60262984A
- Authority
- JP
- Japan
- Prior art keywords
- chemical cleaning
- acid
- titanium
- oxidizing
- heat exchanger
- 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.)
- Pending
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
- C23G1/10—Other heavy metals
- C23G1/106—Other heavy metals refractory metals
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、チタン製熱交換器用の化学洗浄液に関する。[Detailed description of the invention] Industrial applications The present invention relates to a chemical cleaning solution for titanium heat exchangers.
従来の技術
復水器等淡水、半潜水又は海水と接触する熱交換器の材
質としては、銅又は銅合金が使用されているが、近年、
耐食性、耐エロージヨン性、汚損に対する抵抗性、すぐ
れた比強度、り１７−プ特性等からチタンが多く使用さ
れる傾向にある。チタン製熱交換器の場合、材料強度が
大きい反面、高価で且つ熱伝導率が銅合金に比較して小
さいことから、銅合金製熱交換器の６０〜７０チの薄肉
になシ、腐食しろも小さくなる。Conventional Technology Copper or copper alloys are used as the material for heat exchangers such as condensers that come into contact with freshwater, semi-submersible water, or seawater.
Titanium tends to be widely used because of its corrosion resistance, erosion resistance, resistance to staining, excellent specific strength, rip properties, etc. In the case of titanium heat exchangers, although the material strength is high, they are expensive and have lower thermal conductivity than copper alloys. will also become smaller.
カルシウムやマグネシウムを多く含む（所謂、硬度の高
い）海水や淡水で冷却されている熱交換器においては、
冷却水の流通の不良や、軟化処理の不適、循環水のブロ
ー不足、ｐＨ調整不良等によって、伝熱面に炭酸カルシ
ウムや水酸化マグネシウムのスケールが析出し、伝熱を
阻害する。銅合金製熱交換器の場合は、３〜７９６程度
の塩酸や、２〜３−程度の希硫酸によって析出し九スケ
ールは、比較的容易に除去し得る。In heat exchangers that are cooled with seawater or fresh water that contains a lot of calcium and magnesium (high hardness),
Due to poor circulation of cooling water, inappropriate softening treatment, insufficient blowing of circulating water, poor pH adjustment, etc., scales of calcium carbonate and magnesium hydroxide precipitate on heat transfer surfaces, inhibiting heat transfer. In the case of a copper alloy heat exchanger, the nine scales precipitated can be removed relatively easily by using about 3 to 796 dilute hydrochloric acid or about 2 to 3 dilute sulfuric acid.
しかしながら、チタン製熱交換器の場合、塩酸や硫酸の
ような非酸化性酸に対する耐食性が悪いため（特Ｋ、温
度が高くなると著しく耐食性低下する）、塩酸や硫酸は
化学洗浄に使用できず、塩酸、硫酸に比して取扱いがよ
り危険であり、入手もより困難で且つ高価な硝酸等に依
る洗浄が必要である。However, in the case of titanium heat exchangers, hydrochloric acid and sulfuric acid cannot be used for chemical cleaning because they have poor corrosion resistance to non-oxidizing acids such as hydrochloric acid and sulfuric acid. It is more dangerous to handle than hydrochloric acid or sulfuric acid, and requires cleaning with nitric acid, which is more difficult to obtain and expensive.
発明が解決しようとする問題点
本発明の目的は、上記のような欠点を解消し、非酸化性
酸によるチタンの腐食を低減し、付着した硬度スケール
の洗浄除去の信頼性を高めた化学洗浄液を提供する本の
である。Problems to be Solved by the Invention The purpose of the present invention is to provide a chemical cleaning solution that eliminates the above-mentioned drawbacks, reduces corrosion of titanium by non-oxidizing acids, and improves the reliability of cleaning and removing attached hardness scale. This is a book that provides.
問題点を解決するための手段
本発明は、非酸化性酸液中に少なくとも１種以上の酸化
性イオンを添加したことをｊ［ｋとするチタン製熱交換
器の化学洗浄液に関する。Means for Solving the Problems The present invention relates to a chemical cleaning solution for titanium heat exchangers, where j[k is defined as the addition of at least one oxidizing ion to a non-oxidizing acid solution.
作用
本発明の化学洗浄液は、非酸化性酸中に、酸化性イオン
を添加することによって調製される酸化性イオンの添加
によシ、硬度スケールの溶解性を損うことなく、チタン
材質の腐食量を低減することができる。The chemical cleaning solution of the present invention is prepared by adding oxidizing ions to a non-oxidizing acid.The chemical cleaning solution of the present invention is prepared by adding oxidizing ions to a non-oxidizing acid. amount can be reduced.
非酸化性酸溶液中で酸化性イオンの添加によ）耐食性が
向上するのは、酸化性イオン添加により、チタンが活性
溶解の電位域から不働態の電位域ヘシフトする為と考え
られる。The reason why corrosion resistance is improved by the addition of oxidizing ions in a non-oxidizing acid solution is thought to be that the addition of oxidizing ions causes titanium to shift from the active dissolution potential range to the passive potential range.
本発明で使用される耐食性を向上させる酸化性イオンと
して杜、（ｕ”、 Ｆ＠ζ ８意ｏｓトの他、Ｃ＠４
＋１日ｎ”、Ｏｒ藝＋（０ｒ０４”” 、 ０ｒｌＯｙ
’−）があり、これ等は、単独でもまた２種以上の混合
でも使用できる。これ等の酸化性イオンは、塩化物、硫
酸塩、酸化物、水酸化物等いずれでも使用でき、Ｏｒ”
Ｋついては０ｙ０４” 、０ｒ１０７”−のＮａ、に
塩、ＳｓＯ，Ｘ−についてはＮａ、 Ｋ、 ＮＨ４塩等
で使用できる。酸化性イオンの添加濃度は（Ｌ ｊ ｗ
ｔ％以上とすることが好ましい。The oxidizing ions used in the present invention to improve corrosion resistance include C@4
+1 day n”, Orei+(0r04””, 0rlOy
'-), which can be used alone or in combination of two or more. These oxidizing ions can be used as chlorides, sulfates, oxides, hydroxides, etc.
For K, 0y04'' and 0r107''-Na salts can be used, and for SsO and X-, Na, K, NH4 salts, etc. can be used. The concentration of oxidizing ions added is (L j w
It is preferable to set it as t% or more.
また、非酸化性酸としては、塩酸や硫酸等の酸を使用す
ることができる。酸濃度は、高くて、も上記酸化性イオ
ンの添加は効果的であるが、実用上は取扱いの面から１
０−以下の濃度とすることが好ましい。特に硫酸の場合
は濃度が高いとＯａ Ｂ ０４の沈殿が生成するため５
〜５チ程度が好ましい。Furthermore, as the non-oxidizing acid, acids such as hydrochloric acid and sulfuric acid can be used. Addition of the above-mentioned oxidizing ions is effective even if the acid concentration is high, but in practical terms it is difficult to
The concentration is preferably 0- or less. Especially in the case of sulfuric acid, if the concentration is high, a precipitate of Oa B 04 will be formed.
About 5 inches is preferable.
以下に１本発明の実施例を示す。An example of the present invention is shown below.
実、施例１
炭酸カルシウム及び水酸化マグネシウムを１０〜１５メ
ツシユの大きさに調整し、５％塩酸が５０〇−人ったビ
ーカーにそれぞれを３ｔと２ｆ投入し、と九にチタン管
試片［２ａ４ｍ（内径）×１７−（厚み）×５０園（長
さ）〕１本を浸漬し、と九に塩化第二銅を添加し、４０
℃に液温を保持しながら５時間電磁攪拌した。溶解した
チタン濃度を測定し、腐食量をめたａ仁の結果＆１１１
表に示すように、（３１１Ｚ＋イオンには腐食抑制効果
がある事がわかった。Example 1 Calcium carbonate and magnesium hydroxide were adjusted to a size of 10 to 15 meshes, and 3 tons and 2 tons of each were added to a beaker containing 500 tons of 5% hydrochloric acid, and titanium tube specimens were placed in a beaker containing 500 tons of 5% hydrochloric acid. [2a4m (inner diameter) x 17- (thickness) x 50mm (length)] Soak one piece, add cupric chloride to
The mixture was stirred electromagnetically for 5 hours while maintaining the liquid temperature at ℃. The results of measuring the dissolved titanium concentration and calculating the amount of corrosion &111
As shown in the table, it was found that (311Z+ ion has a corrosion inhibiting effect.
また、スケールは、完全に溶解した。Moreover, the scale was completely dissolved.
第 １ 表
実施例２
実施例１と同条件で塩化第二銅の代夛に塩化第二鉄を添
加した場合の試験結果を、第２表に示す。第２表より、
Ｆｅ”＋ イオ／も耐食性向上に効果あるととがわかる
。Ｆａ’→−イオンの添加は、スケールの溶解罠は伺ら
影響なかった。Table 1 Example 2 Table 2 shows the test results when ferric chloride was added to the cupric chloride substitute under the same conditions as in Example 1. From Table 2,
It can be seen that Fe''+ io/ is also effective in improving corrosion resistance.The addition of Fa'→- ions had no effect on scale dissolution traps.
第 ２ 表
実施例５
ＳＯＣの３９６＠ｊｌｉ５００Ｍｔに、実施例１と同様
のチタン試片を浸漬し、これに過硫酸アンそニウムを添
加して、５時間電磁攪拌器で攪拌し、チタンの腐食量を
めた。その結果を第３表に示す。第３表よシ、過硫酸ア
ンモニウムの添加も、腐食抑制に極めて効果的であるこ
とがわかる。Table 2 Example 5 A titanium specimen similar to that in Example 1 was immersed in SOC 396@jli500Mt, ammonium persulfate was added thereto, and the mixture was stirred with a magnetic stirrer for 5 hours to prevent corrosion of titanium. I measured the amount. The results are shown in Table 3. Table 3 shows that the addition of ammonium persulfate is also extremely effective in inhibiting corrosion.
第３表
発明の効果
本発明の化学洗浄液により、非酸化性酸によるチタンの
腐食を低減し、付着した硬度スケールの洗浄除去の信頼
性を高めることができる。Table 3 Effects of the Invention The chemical cleaning solution of the present invention can reduce the corrosion of titanium caused by non-oxidizing acids and improve the reliability of cleaning and removal of attached hardness scale.
また、本発明の化学洗浄液は、取扱いに危険が少なく、
また容易に入手ができ、且つ安価である。In addition, the chemical cleaning solution of the present invention is less dangerous to handle.
It is also easily available and inexpensive.
復代理人 内 １） 明 復代理人 爺 原 亮 −Among the sub-agents: 1) Akira Sub-agent Ryo Hara -
Claims (1)
添加したことを特徴とするチタン製熱交換器の化学洗浄
液。A chemical cleaning solution for a titanium heat exchanger, characterized in that at least one kind of oxidizing ion is added to a non-oxidizing acid solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11818084A JPS60262984A (en) | 1984-06-11 | 1984-06-11 | Chemical cleaning liquid for titanium heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11818084A JPS60262984A (en) | 1984-06-11 | 1984-06-11 | Chemical cleaning liquid for titanium heat exchanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60262984A true JPS60262984A (en) | 1985-12-26 |
Family
ID=14730119
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11818084A Pending JPS60262984A (en) | 1984-06-11 | 1984-06-11 | Chemical cleaning liquid for titanium heat exchanger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60262984A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2002066385A1 (en) * | 2001-02-21 | 2004-06-17 | 株式会社セイワ・プロ | Scale remover attached to titanium material |
| JP2017186611A (en) * | 2016-04-05 | 2017-10-12 | 住友金属鉱山株式会社 | Removing method of scale of heat exchanger |
-
1984
- 1984-06-11 JP JP11818084A patent/JPS60262984A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2002066385A1 (en) * | 2001-02-21 | 2004-06-17 | 株式会社セイワ・プロ | Scale remover attached to titanium material |
| JP2017186611A (en) * | 2016-04-05 | 2017-10-12 | 住友金属鉱山株式会社 | Removing method of scale of heat exchanger |
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