JPS58224181A - Corrosion inhibiting lithium bromide composition - Google Patents
Corrosion inhibiting lithium bromide compositionInfo
- Publication number
- JPS58224181A JPS58224181A JP10529082A JP10529082A JPS58224181A JP S58224181 A JPS58224181 A JP S58224181A JP 10529082 A JP10529082 A JP 10529082A JP 10529082 A JP10529082 A JP 10529082A JP S58224181 A JPS58224181 A JP S58224181A
- Authority
- JP
- Japan
- Prior art keywords
- soln
- lioh
- lithium
- contg
- lithium bromide
- 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
- 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
- C23F11/18—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 inorganic inhibitors
- C23F11/182—Sulfur, boron or silicon containing compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は水酸化リチウム含有臭化リチウム水溶液組成物
、特に吸収式冷凍機等に用いられる水酸化リチウム含有
臭化リチウム水溶液の金属腐蝕性を効果的に抑止する添
加物と水酸化リチウム含有臭化リチウム水溶液とよりな
る新規な腐蝕抑止性臭化リチウム組成物に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention provides an additive that effectively inhibits metal corrosion of lithium bromide aqueous solution compositions containing lithium hydroxide, particularly lithium bromide aqueous solutions containing lithium hydroxide used in absorption refrigerators, etc. and a lithium bromide aqueous solution containing lithium hydroxide.
臭化リチウム水溶液は軟鋼、銅、黄銅等に対する腐蝕性
を持つことは良く知られており、これら金属材料が吸収
式冷凍機に用いられ、その吸収液として臭化リチウム水
溶液が使用される場合はその腐蝕抑止剤として各種のも
のが提案され、そのうちいくつかのものは実際の使用に
供されている。例えばモリブデン酸リチウム、クロム酸
リチウム、硝酸リチウム等の硝酸塩、リン酸リチウム、
ホウ酸リチウム、過塩素酸リチウム、タングステン酸リ
チウム１、バナジン酸リチウム、チオシアン酸リチウム
、ケイフッ化リチウム、亜硝酸リチウム、ジフェニルグ
アニジン、メルカプトベンゾチアゾール、ベンゾトリア
ゾール、ベンゾトリアゾールとモリブデン酸塩、アルカ
ノールアミンもしくは硝酸塩との混合物の他、これらの
うちのある種のものに更に水酸化リチウムが加えられた
もの等が列挙される。It is well known that lithium bromide aqueous solution is corrosive to mild steel, copper, brass, etc., and when these metal materials are used in absorption refrigerators and lithium bromide aqueous solution is used as the absorption liquid, Various types of corrosion inhibitors have been proposed, some of which are in actual use. For example, nitrates such as lithium molybdate, lithium chromate, lithium nitrate, lithium phosphate,
Lithium borate, lithium perchlorate, lithium tungstate 1, lithium vanadate, lithium thiocyanate, lithium fluorosilicate, lithium nitrite, diphenylguanidine, mercaptobenzothiazole, benzotriazole, benzotriazole and molybdate, alkanolamine or In addition to mixtures with nitrates, certain types of these to which lithium hydroxide is further added are listed.
しかし従来のこれらの添加剤は臭化リチウム水溶液の全
面腐蝕防止の点では効果があるものの、種々の欠点を有
している。例えば、クロム酸塩、モリブデン酸塩、硝酸
塩、亜硝酸リチウム等は隙間腐蝕現象を起こす他それ自
体、還元されて消耗がはげしいので管理が煩雑であり、
ベンゾトリアゾールは臭化リチウム水溶液への溶解性に
難があり、ベンゾトリアゾール又はその誘導体とモリブ
デン酸塩と水酸化リチウムとの混合物を添加した場合は
高温での防蝕性に欠ける。水酸化リチウムの添加も防蝕
性は不十分である。However, although these conventional additives are effective in preventing general corrosion of lithium bromide aqueous solutions, they have various drawbacks. For example, chromates, molybdates, nitrates, lithium nitrite, etc. cause crevice corrosion and are themselves reduced and are rapidly consumed, making management complicated.
Benzotriazole has poor solubility in an aqueous lithium bromide solution, and when a mixture of benzotriazole or its derivative, molybdate, and lithium hydroxide is added, it lacks corrosion protection at high temperatures. Addition of lithium hydroxide also provides insufficient corrosion protection.
本発明者等はこれらの欠点を解決すべく検討した結果、
水酸化リチウム含有臭化リチウム水溶液に亜硝酸ソーダ
を添加した組成物が好適であること、更に該亜硝酸ソー
ダを水酸化リチウム含有臭化リチウム水溶液に対して０
．００１〜０．０５重量％添加した組成物が特に秀れて
いることを見出し、本発明を完成した。As a result of the inventors' studies to solve these drawbacks,
A composition in which sodium nitrite is added to a lithium bromide aqueous solution containing lithium hydroxide is suitable, and furthermore, the sodium nitrite is added at 0% to the lithium bromide aqueous solution containing lithium hydroxide.
．． It was discovered that a composition containing 0.001 to 0.05% by weight was particularly excellent, and the present invention was completed.
以下、本発明を更に詳しく説明する。The present invention will be explained in more detail below.
１ 本発明に係る組成物を構成する水酸
化リチウム含有臭化リチウム水溶液は通常用いられてい
る５３〜５５重量％臭化リチウム水溶液に水酸化リチウ
ムが加えられ０．Ｏ１〜０．３０重量％の水酸化リチウ
ム濃度に調整される。1. The lithium bromide aqueous solution containing lithium hydroxide constituting the composition according to the present invention is obtained by adding lithium hydroxide to a commonly used 53 to 55% by weight aqueous lithium bromide solution. The lithium hydroxide concentration is adjusted to 1 to 0.30% by weight.
また、他の構成々分である亜硝酸ソーダは、少なくとも
常温ないし４０°Ｃ近辺で水酸化リチウム含有臭化リチ
ウム水溶液に溶解性があるので、吸収液の商品としての
流通時の取扱い易さの点で便利である。In addition, the other component, sodium nitrite, is soluble in an aqueous lithium bromide solution containing lithium hydroxide at least at room temperature to around 40°C, making it easier to handle when distributing the absorption liquid as a product. It is convenient in many ways.
亜硝酸ソーダの濃度は特に限定されるものではないが、
水酸化リチウム含有臭化リチウム水溶液に対して微量に
過ぎては効果は期待できなく、少なくとも０．００１重
量％添加することが好ましい。また逆に多すぎる場合は
隙間腐蝕を促進する傾向にあり、０．０５重量％を越え
ないことが好ましい。Although the concentration of sodium nitrite is not particularly limited,
If the amount is too small for the lithium bromide aqueous solution containing lithium hydroxide, no effect can be expected, and it is preferable to add at least 0.001% by weight. On the other hand, if the content is too large, it tends to promote crevice corrosion, so it is preferable that the content does not exceed 0.05% by weight.
本発明におけるごとく水酸化リチウムを含有させた場合
の効果が臭化リチウムのみの場合に比べて秀れているこ
とは従来から知られている通りであるが、本発明におい
ては、前記のごとく臭化リチウム５３〜５５重量％の水
溶液に水酸化リチウムを０．０１〜０３重量％添加にな
る水酸化リチウム含有臭化リチウム水溶液が用いられて
いる。It has been known that the effects of containing lithium hydroxide as in the present invention are superior to those of lithium bromide alone; A lithium bromide aqueous solution containing lithium hydroxide is used, in which 0.01 to 03% by weight of lithium hydroxide is added to an aqueous solution containing 53 to 55% by weight of lithium hydroxide.
次に本発明に係る組成物を用いた実施例について説明す
る。Next, examples using the composition according to the present invention will be described.
実施例１〜３、比較例１〜４
実施の効果は、腐蝕減量及び隙間腐蝕の有無の測定によ
り判断した。Examples 1 to 3, Comparative Examples 1 to 4 The effects of the implementation were determined by measuring the corrosion weight loss and the presence or absence of crevice corrosion.
これらの具体的測定方法について説明する。These specific measurement methods will be explained.
腐蝕減量は水酸化リチウムを０１重量％、臭化リチウム
を５５重量％含有する水溶液に亜硝酸よこ） ３．０Ｃ
ＩＩＬＸ （厚み） ０．２ｃ／ＩＬ（７）２３．２ｇ
（７）Ｓ ５４１ｖＪで、吊り下げ用孔を持つ平板をエ
メリー紙でよく研磨し、且つ脱脂処理をした２枚を隔離
して吊り下げ、１ｏｏｏ時間の煮沸処理をし、その重量
減により判断した。The corrosion weight loss is calculated by adding nitrite to an aqueous solution containing 0.1% by weight of lithium hydroxide and 55% by weight of lithium bromide) 3.0C
IILX (thickness) 0.2c/IL(7) 23.2g
(7) Using S541vJ, the two flat plates with holes for hanging were polished well with emery paper and degreased, then hung separately, boiled for 100 hours, and judged based on the weight loss. .
また隙間腐蝕の発生の有無は、前記腐蝕減量測定に供し
たものと同組成の水溶液を、同様のフラスコ中に入れ、
（たて） ３．０ＣｒＩｌＸ （よこ）２、ＯＣｍＸ（
厚み）０．２ｃｍの５Ｓ４１材平板でエメリー紙でよく
研磨し、脱脂処理をしたものにシリコーンゴム製輪ゴム
（巾０．５ｃｍ、折り径１５ＣＩｒＬ）をよこ方向に２
本掛けたものを浸漬し１０００時間煮沸処理をして後、
輪ゴムで被覆されていた部分の表面腐蝕の発生の有無に
より判定した。In addition, the presence or absence of crevice corrosion can be determined by placing an aqueous solution with the same composition as that used for the corrosion weight loss measurement in the same flask.
(Vertical) 3.0CrIlX (Horizontal) 2, OCmX (
A silicone rubber band (width 0.5 cm, fold diameter 15 CIrL) was placed on a 5S41 flat plate (thickness) 0.2 cm, well polished with emery paper and degreased in the horizontal direction.
After soaking and boiling for 1000 hours,
Judgment was made based on the presence or absence of surface corrosion of the area covered with the rubber band.
第１表には水溶液組成と、測定した本発明の効果を示し
た。Table 1 shows the aqueous solution composition and the measured effects of the present invention.
第１表
（ｘｌ）実施例では５５重量％ＬｉＢｒ水溶液にＬｉＯ
Ｈを０．１重量％添加した水溶液に対する添加量、比較
例では５５重量％Ｌｉ Ｂｒ水溶液に対する添加量
以上の結果から明らかなごとく亜硝酸ソーダと水酸化リ
チウムの添加は臭化リチウム水溶液の防蝕性に非常に効
果的である。しかも亜硝酸ソーダはきわめて微量でもよ
いことがわかる。Table 1 (xl) In the example, LiO was added to a 55% by weight LiBr aqueous solution.
It is clear from the results that the amount added to an aqueous solution containing 0.1% by weight of H, and the amount added to a 55% by weight Li Br aqueous solution in the comparative example, the addition of sodium nitrite and lithium hydroxide improves the corrosion resistance of the lithium bromide aqueous solution. very effective. Furthermore, it can be seen that a very small amount of sodium nitrite is sufficient.
特許出願人 昭和電工株式会社 代理人 菊地精− ４４Patent applicant: Showa Denko Co., Ltd. Agent Sei Kikuchi 44
Claims (2)
ソーダを添加してなる腐蝕抑止性臭化リチウム組成物(1) Corrosion inhibiting lithium bromide composition obtained by adding sodium nitrite to a lithium bromide aqueous solution containing lithium hydroxide
水溶液に対して０．００１〜０．０５重量％添加してな
る、特許請求の範囲第１項記載の腐蝕抑止性臭化リチウ
ム組成物(2) The corrosion-inhibiting lithium bromide composition according to claim 1, which comprises adding 0.001 to 0.05% by weight of sodium nitrite to a lithium bromide aqueous solution containing lithium hydroxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10529082A JPS58224181A (en) | 1982-06-21 | 1982-06-21 | Corrosion inhibiting lithium bromide composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10529082A JPS58224181A (en) | 1982-06-21 | 1982-06-21 | Corrosion inhibiting lithium bromide composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58224181A true JPS58224181A (en) | 1983-12-26 |
Family
ID=14403549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10529082A Pending JPS58224181A (en) | 1982-06-21 | 1982-06-21 | Corrosion inhibiting lithium bromide composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58224181A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63273767A (en) * | 1987-05-06 | 1988-11-10 | 三洋電機株式会社 | Plate type heat exchanger for absorption type water heater and chiller |
-
1982
- 1982-06-21 JP JP10529082A patent/JPS58224181A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63273767A (en) * | 1987-05-06 | 1988-11-10 | 三洋電機株式会社 | Plate type heat exchanger for absorption type water heater and chiller |
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