JP4865293B2 - Anticorrosive used for aluminum, etc. - Google Patents
Anticorrosive used for aluminum, etc. Download PDFInfo
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- JP4865293B2 JP4865293B2 JP2005306555A JP2005306555A JP4865293B2 JP 4865293 B2 JP4865293 B2 JP 4865293B2 JP 2005306555 A JP2005306555 A JP 2005306555A JP 2005306555 A JP2005306555 A JP 2005306555A JP 4865293 B2 JP4865293 B2 JP 4865293B2
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- tetrazole
- nitrite
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 17
- 229910052782 aluminium Inorganic materials 0.000 title claims description 17
- 229910000838 Al alloy Inorganic materials 0.000 claims description 17
- 239000003795 chemical substances by application Substances 0.000 claims description 14
- 238000005260 corrosion Methods 0.000 claims description 13
- 150000003536 tetrazoles Chemical class 0.000 claims description 13
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims description 10
- 239000007864 aqueous solution Substances 0.000 claims description 9
- -1 tetrazole compound Chemical class 0.000 claims description 8
- KJUGUADJHNHALS-UHFFFAOYSA-N 1H-tetrazole Chemical compound C=1N=NNN=1 KJUGUADJHNHALS-UHFFFAOYSA-N 0.000 claims description 7
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical group [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 4
- 229910018505 Ni—Mg Inorganic materials 0.000 claims description 3
- 229910018594 Si-Cu Inorganic materials 0.000 claims description 3
- 229910008465 Si—Cu Inorganic materials 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 235000010288 sodium nitrite Nutrition 0.000 claims description 3
- ULRPISSMEBPJLN-UHFFFAOYSA-N 2h-tetrazol-5-amine Chemical compound NC1=NN=NN1 ULRPISSMEBPJLN-UHFFFAOYSA-N 0.000 claims description 2
- 229910018134 Al-Mg Inorganic materials 0.000 claims description 2
- 229910018125 Al-Si Inorganic materials 0.000 claims description 2
- 229910018182 Al—Cu Inorganic materials 0.000 claims description 2
- 229910018467 Al—Mg Inorganic materials 0.000 claims description 2
- 229910018520 Al—Si Inorganic materials 0.000 claims description 2
- 229910018566 Al—Si—Mg Inorganic materials 0.000 claims description 2
- 229910017758 Cu-Si Inorganic materials 0.000 claims description 2
- 229910017931 Cu—Si Inorganic materials 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- JAAIPIWKKXCNOC-UHFFFAOYSA-N 1h-tetrazol-1-ium-5-thiolate Chemical compound SC1=NN=NN1 JAAIPIWKKXCNOC-UHFFFAOYSA-N 0.000 claims 1
- 229910017818 Cu—Mg Inorganic materials 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 230000007797 corrosion Effects 0.000 description 9
- YXIWHUQXZSMYRE-UHFFFAOYSA-N 1,3-benzothiazole-2-thiol Chemical compound C1=CC=C2SC(S)=NC2=C1 YXIWHUQXZSMYRE-UHFFFAOYSA-N 0.000 description 8
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 6
- 239000002244 precipitate Substances 0.000 description 6
- 159000000000 sodium salts Chemical class 0.000 description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical compound NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000003949 liquefied natural gas Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000012488 sample solution Substances 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 239000008399 tap water Substances 0.000 description 3
- 235000020679 tap water Nutrition 0.000 description 3
- DHMQDGOQFOQNFH-UHFFFAOYSA-N Glycine Chemical compound NCC(O)=O DHMQDGOQFOQNFH-UHFFFAOYSA-N 0.000 description 2
- 239000005708 Sodium hypochlorite Substances 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 2
- IOSUZWIAKSMOPH-UHFFFAOYSA-N 1h-tetrazol-1-ium;nitrite Chemical class [O-]N=O.[NH2+]1C=NN=N1 IOSUZWIAKSMOPH-UHFFFAOYSA-N 0.000 description 1
- IVLXQGJVBGMLRR-UHFFFAOYSA-N 2-aminoacetic acid;hydron;chloride Chemical compound Cl.NCC(O)=O IVLXQGJVBGMLRR-UHFFFAOYSA-N 0.000 description 1
- 241001163841 Albugo ipomoeae-panduratae Species 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 239000004471 Glycine Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 229960002449 glycine Drugs 0.000 description 1
- 229960001269 glycine hydrochloride Drugs 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Description
本発明は、無公害で安定性に優れた防食剤であって、特にアルミニウムまたはアルミニウム合金に使用するのに適したものに関する。 The present invention relates to a pollution-free and anti-corrosive anticorrosive agent, particularly suitable for use in aluminum or aluminum alloys.
液化ガス、液化天然ガス運搬船の貯蔵タンクは、アルミニウムまたはアルミニウム合金（以下、アルミニウム等と略称することがある）が使用される。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、密封性等の検査を行っている。液化天然ガス等を貯蔵するタンクは巨大なものが多く、水による試験を行う場合、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、タンクに注水、排水する時間も含めて水がアルミニウム等と接している時間も長く数週間を要することもある。 A storage tank of a liquefied gas or liquefied natural gas carrier ship uses aluminum or an aluminum alloy (hereinafter sometimes abbreviated as aluminum or the like). These tanks are inspected for structure, foundation, balance, sealability, etc. by completing a water pressure test or a water load test when completed. Many tanks that store liquefied natural gas, etc. are huge, and when conducting tests with water, water amounts from thousands to tens of thousands of tons may be used. Therefore, the time for which the water is in contact with the aluminum or the like, including the time for pouring and draining water into the tank, may be long and may require several weeks.
アルミニウム等は酸、アルカリによる表面皮膜の溶解度が大きいため、酸性水またはアルカリ性水に接触した全面に腐食を発生する。中性域においては比較的、表面皮膜は安定であるが、局部的に孔食を発生することが多い。アルミニウム等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には、特に腐食が発生しやすく、いわゆる白錆（アルミニウム水酸化物）が析出する。 Aluminum or the like has high surface film solubility due to acid or alkali, and therefore, corrosion occurs on the entire surface in contact with acidic water or alkaline water. In the neutral range, the surface film is relatively stable, but pitting corrosion often occurs locally. When tap water and industrial water are used as they are for various tests such as aluminum, corrosion is particularly likely to occur, so-called white rust (aluminum hydroxide) is deposited.
これらの腐食は、水質、水との接触時間、水温等によって程度の相違があり、腐食によって構造上重大な影響を与えるということは一概にいえないが、品質管理のうえから重要である。特に液化天然ガスが貯蔵されるタンクにあっては、これらの腐食部に析出したアルミニウム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ので、殆んど不可能である。そのため、防食対策はタンク内清浄化のうえから必要である。 These corrosions vary in degree depending on the water quality, contact time with water, water temperature, etc., and it cannot be generally said that the corrosion has a significant structural influence, but it is important for quality control. Especially in tanks where liquefied natural gas is stored, the aluminum hydroxide deposited on these corroded parts is peeled off, causing serious problems such as clogging of the pump that transfers the liquefied gas and seizure of the pump. Has been pointed out to give. In a large-capacity tank, it is almost impossible to repair and clean the inside of the tank after draining the water used for the water pressure or water load test because it requires enormous facilities and man-hours. Therefore, anti-corrosion measures are necessary after cleaning the tank.
従来、水と接触するアルミニウム等のタンク内の防食として、例えば特許文献１にメルカプトベンゾチアゾールとアルミン酸塩との併用水溶液が開示されている。また、特許文献２には、ナトリウムアルキルジアミノエチルグリシン、塩酸アルキルジアミノエチルグリシン、塩酸アルキルポリアミノエチルグリシン及びジシアンジアミドのホルマリン縮合物の防食剤が記載されている。 Conventionally, for example, Patent Document 1 discloses a combined aqueous solution of mercaptobenzothiazole and aluminate as anticorrosion in a tank of aluminum or the like that comes into contact with water. Patent Document 2 describes an anticorrosive agent for a formalin condensate of sodium alkyldiaminoethylglycine, alkyldiaminoethylglycine hydrochloride, alkylpolyaminoethylglycine hydrochloride and dicyandiamide.
ところが、特許文献１に記載されたメルカプトベンゾチアゾールは、使用時に溶存酸素や水道水中に含まれる残留塩素による酸化反応により析出物が生じる。また、特許文献２に記載されたナトリウムアルキルジアミノエチルグリシン、塩酸アルキルジアミノエチルグリシン、塩酸アルキルポリアミノエチルグリシン及びジシアンジアミドのホルマリン縮合物は、原因は不明であるが、使用時に経時変化により析出物が生じる事がある。そのため、防食剤を排出した後のタンク内手直し、清掃を行うことが必要となり莫大な設備と工数を要するという問題があった。 However, the mercaptobenzothiazole described in Patent Document 1 produces precipitates by oxidation reaction with dissolved oxygen or residual chlorine contained in tap water during use. The cause of the formalin condensate of sodium alkyl diaminoethyl glycine, alkyl diaminoethyl glycine hydrochloride, alkyl polyaminoethyl glycine hydrochloride and dicyandiamide described in Patent Document 2 is unknown, but precipitates are formed due to changes over time during use. There is a thing. Therefore, there is a problem that it is necessary to repair and clean the inside of the tank after discharging the anticorrosive agent, and enormous facilities and man-hours are required.
本発明は前記の課題を解決するためになされたもので、安定性に優れて使用後に後処理の必要のない、アルミニウム等に使用するのに適し、しかも無公害の防食剤を提供することを目的とする。 The present invention has been made to solve the above-mentioned problems, and provides a corrosion-free anticorrosive agent that is excellent in stability and does not require post-treatment after use, and is suitable for use in aluminum or the like. Objective.
前記の目的を達成するためになされた、特許請求の範囲の請求項１に記載された発明は、１H−テトラゾール、５−アミノテトラゾール、１−フェニル−５メルカプト−１，２，３，４−テトラゾールから選ばれる少なくとも何れかのテトラゾール類、および前記テトラゾール類の塩から選ばれる少なくとも１種のテトラゾール化合物と、亜硝酸塩とからなる防食性の化合物を溶解した水溶液を含み、
前記水溶液中、前記テトラゾール化合物が５〜３０ｐｐｍ、前記亜硝酸塩が３０〜１５０ｐｐｍであることを特徴とするアルミニウムまたはアルミニウム合金用の防食剤である。
In order to achieve the above object, the invention described in claim 1 of claim 1 includes 1H-tetrazole, 5-aminotetrazole, 1-phenyl-5 mercapto-1,2,3,4- At least one of tetrazole selected from tetrazole, and at least one tetrazole compound selected from a salt of the tetrazole, looking containing an aqueous solution prepared by dissolving anti-corrosion compound consisting of nitrite,
In the aqueous solution, the tetrazole compound is 5 to 30 ppm, and the nitrite is 30 to 150 ppm . An anticorrosive for aluminum or aluminum alloy.
同じく請求項２に記載された発明は、前記した亜硝酸塩が、亜硝酸ナトリウムであることを特徴とする請求項１に記載の防食剤である。 Similarly, the invention described in claim 2 is the anticorrosive agent according to claim 1, wherein the nitrite is sodium nitrite .
請求項３に記載された発明は、前記したテトラゾール化合物と、亜硝酸塩との重量比率が１：１〜１：３０であることを特徴とする請求項１に記載の防食剤である。 The invention described in claim 3 is the anticorrosive agent according to claim 1, wherein the weight ratio of the tetrazole compound and nitrite is 1: 1 to 1:30.
請求項４に記載された発明は、アルミニウム合金が、Al-Cu系、Al-Cu-Si系、Al-Si系、Al-Si-Mg系、Al-Si-Cu系、Al-Si-Cu-Mg系、Al-Cu-Ni-Mg系、Al-Mg系、およびAl-Si-Cu-Ni-Mg系から選ばれる合金であることを特徴とする請求項１に記載の防食剤である。 In the invention described in claim 4, the aluminum alloy is Al-Cu, Al-Cu-Si, Al-Si, Al-Si-Mg, Al-Si-Cu, Al-Si-Cu. The anticorrosive agent according to claim 1, which is an alloy selected from the group consisting of -Mg, Al-Cu-Ni-Mg, Al-Mg, and Al-Si-Cu-Ni-Mg. .
尚、これらのアルミニウム合金は、JIS H 4000に1085, 1080, 1070, 1050, 1100, 1200, 1N00, 1N30, 2014, ,2017, 2219, 2024, 3003, 3203, 3004, 3104, 3105, 5005, 5052, 5652, 5652, 5154, 5254, 5454, 5082, 5083, 5086, 5N01, 6061, 7075, 7N01として規定されるアルミニウム及びアルミニウム合金の板及び条の材質である。またJIS H5202にAC1A, AC1B, AC2A, AC2B, AC3A, AC4A, AC4B, AC4C, AC4CH, AC4D, AC5A, AC7A, AC7B, AC8A, AC8B, AC8C, AC9A, AC9Bとして規定されるアルミニウム合金鋳物の材質である。 These aluminum alloys are JIS H 4000 according to 1085, 1080, 1070, 1050, 1100, 1200, 1N00, 1N30, 2014,, 2017, 2219, 2024, 3003, 3203, 3004, 3104, 3105, 5005, 5052 , 5652, 5652, 5154, 5254, 5454, 5082, 5083, 5086, 5N01, 6061, 7075, 7N01, and aluminum and aluminum alloy plates and strips. Also, it is a material of aluminum alloy casting specified in JIS H5202 as AC1A, AC1B, AC2A, AC2B, AC3A, AC4A, AC4B, AC4C, AC4CH, AC4D, AC5A, AC7A, AC7B, AC8A, AC8B, AC8C, AC9A, AC9B .
請求項５に記載された発明は、前記アルミニウムまたはアルミニウム合金が、液または／およびガスの貯蔵タンクの構造体であることを特徴とする請求項１に記載の防食剤である。 The invention described in claim 5 is the anticorrosive agent according to claim 1, wherein the aluminum or aluminum alloy is a structure of a liquid or / and gas storage tank.
本発明の防食剤は、テトラゾール等と、亜硝酸塩との両方を溶解した水溶液としたことにより、アルミニウムまたはアルミニウム合金用の防食剤として極めて優れた性能を示す。 The anticorrosive agent of the present invention exhibits extremely excellent performance as an anticorrosive agent for aluminum or aluminum alloy by using an aqueous solution in which both tetrazole and the like and nitrite are dissolved.
テトラゾール類またはその塩は、単独でもアルミニウムまたはアルミニウム合金に対しある程度の防食性を示すが、不十分である。亜硝酸塩はほとんど防食性を示さない。本発明ではこれらを混合したことで、低濃度でほぼ完全にアルミニウムまたはアルミニウム合金の腐食を抑制することができる。また安定性においても非常に優れているため、使用後の後処理も極めて簡単に済ませることができる。 Tetrazoles or salts thereof, exhibit a certain degree of corrosion resistance to aluminum and aluminum alloys alone are insufficient. Nitrite shows little anticorrosion. In the present invention, by mixing these, corrosion of aluminum or aluminum alloy can be suppressed almost completely at a low concentration. Moreover, since it is very excellent in stability, post-treatment after use can be completed very easily.
以下、本発明の実施例を詳細に説明するが、本発明の範囲はこれらの実施例に限定されるものではない。 Examples of the present invention will be described in detail below, but the scope of the present invention is not limited to these examples.
（防食性能評価）
上水道水500ｍｌに、表１に示すテトラゾール類のナトリウム塩および亜硝酸塩として亜硝酸ナトリウムを添加して撹拌し、防錆剤の試料液を調製した。#４００ペーパーで磨いたA5083（50×60×12ｍｍ中央に溶接線を有するもの）を各防錆剤の試料液に浸漬し、25〜30℃で30日間浸漬した。試料液からアルミニウム合金を取り出し、腐食減量及び表面状態（孔食性、変色性）の有無を目視によって調べた。
(Anti-corrosion performance evaluation)
In tap water 500 ml, and stirred sodium nitrite was added as a sodium salt and nitrite tetrazoles shown in Table 1 to prepare a sample solution of rust inhibitor. A5083 (having a weld line in the center of 50 × 60 × 12 mm) polished with # 400 paper was immersed in a sample solution of each rust inhibitor and immersed at 25-30 ° C. for 30 days. The aluminum alloy was taken out from the sample solution, and the presence or absence of corrosion weight loss and surface condition (pitting corrosion, discoloration) was examined visually.
それらの結果を表１に併せて示す。 The results are also shown in Table 1.
（耐酸化性について従来品との比較評価）
テトラゾール類のナトリウム塩各１％水溶液(テトラゾール類としての濃度)300mlに次亜塩素酸ソーダ濃度が1％となるように加えた後の外観を目視によって調べた。比較のため、メルカプトベンゾチアゾールのナトリウム塩１％（特許文献１に開示の仕様）水溶液300mlに次亜塩素酸ソーダ濃度が1％となるように加えた後の外観を目視によって調べた。
(Oxidation resistance compared with conventional products)
Sodium hypochlorite concentration in 300 ml (concentration as tetrazoles) each 1% aqueous solution of tetrazole was examined by visual appearance after the addition to be 1%. For comparison, the appearance after adding a sodium hypochlorite concentration of 1% to 300 ml of a 1% aqueous solution of sodium salt of mercaptobenzothiazole (specifications disclosed in Patent Document 1) was visually examined.
その結果、テトラゾール類のナトリウム塩では析出物が無かったが、メルカプトベンゾチアゾールのナトリウム塩では析出物があった。 As a result, there was no precipitate in the sodium salt of tetrazole , but there was a precipitate in the sodium salt of mercaptobenzothiazole.
（長期間サイクルにおける安定性について従来品との比較の評価）
テトラゾール類のナトリウム塩各300ppm水溶液(テトラゾール類としての濃度)400mlにA5083（50×60×12ｍｍ中央に溶接線を有するもの）を浸漬し10℃、50℃の12時間サイクルで30日間静置した場合の液外観を目視によって調べた。比較のため、ナトリウムアルキルジアミノエチルグリシン、塩酸アルキルジアミノエチルグリシン、塩酸アルキルポリアミノエチルグリシン及びジシアンジアミドのホルマリン縮合物の300ppm水溶液400ml（特許文献２に開示の仕様）に、同一のアルミニウム合金を浸漬し上記と同一サイクルで静置した場合の液外観を目視によって調べた。
(Evaluation of comparison with conventional products for stability in long-term cycle)
A5083 in 400 ml (concentration as tetrazoles) sodium salt respective 300ppm aqueous tetrazoles (50 × 60 × having a 12mm central to the welding line) dipped 10 ° C. and allowed to stand for 30 days at 12 hour cycle of 50 ° C. The liquid appearance in each case was examined visually. For comparison, the same aluminum alloy is immersed in 400 ml of a 300 ppm aqueous solution of formalin condensate of sodium alkyldiaminoethylglycine hydrochloride, alkyldiaminoethylglycine hydrochloride, alkylpolyaminoethylglycine hydrochloride and dicyandiamide (specifications disclosed in Patent Document 2). The liquid appearance when left in the same cycle was visually examined.
その結果、テトラゾール類のナトリウム塩では析出物が無かったが、比較物ではアルミニウム合金の中央の溶接線に析出物があった。 As a result, the precipitate was not a sodium salt of tetrazole, the comparative product had precipitate the weld line in the center of the aluminum alloy.
Claims (5)
前記水溶液中、前記テトラゾール化合物が５〜３０ｐｐｍ、前記亜硝酸塩が３０〜１５０ｐｐｍであることを特徴とするアルミニウムまたはアルミニウム合金用の防食剤。 1H- tetrazole, 5-aminotetrazole, 1-phenyl-5 at least one of tetrazole selected from mercapto-1,2,3,4-tetrazole, and at least one tetrazole compound selected from a salt of the tetrazole When, seen containing an aqueous solution prepared by dissolving anti-corrosion compound consisting of nitrite,
An anticorrosive for aluminum or aluminum alloy , wherein the tetrazole compound is 5 to 30 ppm and the nitrite is 30 to 150 ppm in the aqueous solution .
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