JPH01240674A - Chemical conversion treatment for forming silicate film excellent in whitening resistance - Google Patents
Chemical conversion treatment for forming silicate film excellent in whitening resistanceInfo
- Publication number
- JPH01240674A JPH01240674A JP6390888A JP6390888A JPH01240674A JP H01240674 A JPH01240674 A JP H01240674A JP 6390888 A JP6390888 A JP 6390888A JP 6390888 A JP6390888 A JP 6390888A JP H01240674 A JPH01240674 A JP H01240674A
- Authority
- JP
- Japan
- Prior art keywords
- treatment
- whitening resistance
- film
- chemical conversion
- aluminum
- 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
- 238000011282 treatment Methods 0.000 title claims abstract description 35
- 230000002087 whitening effect Effects 0.000 title claims abstract description 15
- 239000000126 substance Substances 0.000 title claims description 11
- 238000006243 chemical reaction Methods 0.000 title claims description 9
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 title abstract 4
- 229910052910 alkali metal silicate Inorganic materials 0.000 claims abstract description 17
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 11
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 5
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 5
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 4
- 150000001340 alkali metals Chemical class 0.000 claims abstract description 4
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 4
- 229910052700 potassium Inorganic materials 0.000 claims abstract description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 19
- 229910052782 aluminium Inorganic materials 0.000 abstract description 19
- 239000000463 material Substances 0.000 abstract description 18
- 239000007864 aqueous solution Substances 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 8
- 238000001035 drying Methods 0.000 abstract description 6
- 238000005406 washing Methods 0.000 abstract description 4
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 238000005260 corrosion Methods 0.000 description 10
- 230000007797 corrosion Effects 0.000 description 10
- 239000000243 solution Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 238000004381 surface treatment Methods 0.000 description 4
- 238000010306 acid treatment Methods 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 235000013361 beverage Nutrition 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 150000001447 alkali salts Chemical class 0.000 description 2
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 2
- 241001163841 Albugo ipomoeae-panduratae Species 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007739 conversion coating Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 210000003454 tympanic membrane Anatomy 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/82—After-treatment
- C23C22/83—Chemical after-treatment
-
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/60—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using alkaline aqueous solutions with pH greater than 8
- C23C22/66—Treatment of aluminium or alloys based thereon
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、アルミニウム及びアルミニウム合金（以下、
単にアルミニウムと云う）の水環境乃至は水蒸気に対す
る耐食性表面処理法に係り、更に詳しくは、エアコン用
等のフィン材や飲料缶用等の各種アルミニウム材料の耐
白変性の向上を目的とした化成処理法に関するものであ
る。Detailed Description of the Invention (Industrial Application Field) The present invention relates to aluminum and aluminum alloys (hereinafter referred to as
It relates to a surface treatment method for corrosion resistance of aluminum (simply referred to as aluminum) against water environments or water vapor, and more specifically, chemical conversion treatment aimed at improving the whitening resistance of various aluminum materials such as fin materials for air conditioners and beverage cans. It is about law.
（従来の技術及び解決しようとする課題）アルミニウム
材料は、軽量で成形性及び耐食性が優れているため、エ
アコン用のフィン材等に多用されており、また飲料缶、
飲食缶などの缶ボディ材や缶蓋材等にも利用されている
。(Prior art and problems to be solved) Aluminum materials are lightweight and have excellent formability and corrosion resistance, so they are often used for fin materials for air conditioners, etc., and are also used for beverage cans,
It is also used as can body material and can lid material for food and beverage cans.
しかし、アルミニウムは耐食性・が優れているとはいえ
、通常の大気雰囲気中においては腐食の問題はないもの
の、特に高温において水或いは水蒸気と接触した場合に
は、アルミニウム表面が変色しく通常、白変と称されて
いる）、白錆の発生に到る場合がある。However, although aluminum has excellent corrosion resistance, there is no problem with corrosion in normal atmospheric conditions, but when it comes into contact with water or steam, especially at high temperatures, the aluminum surface usually changes color and turns white. ), which may lead to the formation of white rust.
そのため、従来より、アルミニウム表面にクロメート処
理を施すことが一般的に行われているが、クロメート系
化成処理浴にはクロム、フッ素等が含まれているため、
人体に対して有害となる問題があり、そのために排水処
理設偉を設置する必要がある。For this reason, it has been common practice to perform chromate treatment on aluminum surfaces, but since chromate-based chemical conversion baths contain chromium, fluorine, etc.
There is a problem that it is harmful to the human body, so it is necessary to install wastewater treatment facilities.
このような公害、衛生面の改善策として、特公昭５７−
４３６３４号や特公昭５３−４８１７７号に開示された
アルカリ硅酸塩処理による方法がある。いずれの方法も
アルカリ硅酸塩溶液をアルミニウム材料に塗布、焼付け
する工程を採用することにより、より一層の防食機能を
持たせると共に、併せて公害等の問題の解決をしようと
するものである。As a measure to improve such pollution and hygiene,
There is a method using alkali silicate treatment disclosed in Japanese Patent Publication No. 43634 and Japanese Patent Publication No. 53-48177. Both methods employ a step of applying an alkali silicate solution to the aluminum material and baking it, thereby providing an even greater anticorrosive function and at the same time attempting to solve problems such as pollution.
具体的には、前者（特公昭５７−４３６３４号）−の方
法は照明器具の反射体等の用途に適する方法であり、耐
フッ酸等に対する耐食性が良好であるというものである
。また、後者（特公昭５３−４８１７７号）の方法は熱
交換器用等の用途に適する方法であり、９５％相対湿度
、５０℃で１００時間暴露した場合に良好な耐食性が得
られるというものである。Specifically, the former method (Japanese Patent Publication No. 57-43634) is suitable for use as a reflector for lighting equipment, and has good corrosion resistance to hydrofluoric acid and the like. Furthermore, the latter method (Japanese Patent Publication No. 53-48177) is suitable for applications such as heat exchangers, and provides good corrosion resistance when exposed at 95% relative humidity and 50°C for 100 hours. .
しかし乍ら、前者の方法は複雑な工程からなると共に処
理時間が長いという問題があり、更にはいずれの方法も
、より一層の高温多湿の厳しい腐食環境での耐食性の点
では必ずしも充分な性能が得られるとは云えない。However, the former method has the problem of complicated processes and long processing times, and furthermore, both methods do not necessarily have sufficient performance in terms of corrosion resistance in harsh corrosive environments of high temperature and humidity. I can't say that I can get it.
本発明は、か−る状況のもとでなされたものであって、
特に高温多湿環境においても耐白変機能を保持するとか
でき、しかもこのような表面処理を短時間の処理工程で
可能とし、アルミニウムコイル材の連続的処理への適用
を可能とするアルミニウム表面処理法を提供することを
目的とするものである。The present invention was made under such circumstances, and
An aluminum surface treatment method that maintains whitening resistance even in high-temperature and high-humidity environments, and that enables this type of surface treatment in a short treatment process, making it possible to apply it to continuous treatment of aluminum coil materials. The purpose is to provide the following.
（課題を解決するための手段）
前記目的を達成するため、本件出願人の提案に係る前記
特公昭５３−４８１７７号によるアルミニウム化成処理
方法を改善して、更に厳しい腐食環境下で優れた耐食性
を発揮し得る方法を見い出すべく鋭意研究を重ねた・
その結果、先の提案による化成処理をベースとするが、
得られる化成皮膜中にアルカリ塩が残存することに起因
して厳しい環境中での耐食性が劣化することに鑑みて、
脱アルカリ処理を施すこととし、しかし、その際、前工
程の条件の規制と共に特定の酸処理が耐白変性向上に非
常に効果的であることが判明し、ここに本発明をなした
ものである。(Means for Solving the Problems) In order to achieve the above object, the aluminum chemical conversion treatment method proposed by the applicant in the above-mentioned Japanese Patent Publication No. 53-48177 was improved to provide even more excellent corrosion resistance in a severe corrosive environment. We conducted extensive research to find a method that could be effective. As a result, we decided to use the chemical conversion treatment proposed earlier.
In view of the fact that corrosion resistance in harsh environments deteriorates due to residual alkali salts in the resulting chemical conversion coating,
However, it was found that a specific acid treatment along with regulating the conditions of the previous process is very effective in improving whitening resistance, and the present invention was created here. be.
すなわち、本発明に係る耐白変性に優れた化成処理法は
、アルミニウム及びアルミニウム合金をＳ ｉ Ｑ 、
／ Ｍ ２０比（但し、ＭはＬｉ、Ｎａ、に等のアル
カリ金属である）が１以上のアルカリ珪酸塩で処理した
後、２００〜３００℃の温度にて１分〜５秒間焼付けし
、次いで硝酸水溶液により脱アルカリ処理をすることを
特徴とするものである６以下に本発明を更に詳細に説明
する。That is, the chemical conversion treatment method excellent in whitening resistance according to the present invention is to treat aluminum and aluminum alloys with S i Q ,
/ M20 ratio (where M is an alkali metal such as Li, Na, etc.) is treated with an alkali silicate of 1 or more, then baked at a temperature of 200 to 300°C for 1 minute to 5 seconds, and then The present invention, which is characterized by dealkalization treatment using an aqueous nitric acid solution, will be explained in further detail below.
まず、化成処理剤としては、有害物質を含有しないアル
カリ珪酸塩を用いるが、ＳｉＯ□／Ｍ２０比（但し、Ｍ
はＬｉ、Ｎａ、に等のアルカリ金属である）が１未満の
場合は、アルカリ成分のためにアルミニウムの侵食が増
大するので好ましくなく、したがって、Ｓ ｘ Ｏ２／
Ｍ ２０比を１以上とする必要があり、３以上とする
のが好ましい。First, as a chemical conversion treatment agent, an alkali silicate containing no harmful substances is used, but the SiO□/M20 ratio (however, M
is an alkali metal such as Li, Na, etc.) is less than 1, it is undesirable because corrosion of aluminum increases due to the alkali component.
The M20 ratio must be 1 or more, preferably 3 or more.
この所定のＳｉ○２／Ｍ２０比を有するアルカリ珪酸塩
の水溶液をアルミニウムに塗布した後、乾燥することな
く、焼付ける。塗布法はロールコータ、ハケ或いは浸漬
等のいずれの方法も可能である。焼付けは、２００〜３
００℃の温度にて１分〜５秒の範囲の条件とする必要が
ある。本条件よす小さい熱エネルギーで処理した場合は
、生成されるアルカリ珪酸塩皮膜の硬化（キュアー）が
充分でなく、また逆に本条件で示された熱エネルギーよ
り大きい場合は１次工程の硝酸水溶液による脱アルカリ
処理が効果的に行われず、皮膜中にアルカリ塩が残存し
、所望の皮膜が得られないので、好ましくない。なお、
３００℃×１分処理はこの点で避けるのが望ましい。After applying this aqueous solution of alkali silicate having a predetermined Si○2/M20 ratio to aluminum, it is baked without drying. Any method such as a roll coater, a brush, or a dipping method can be used as the coating method. Baking is 200-3
It is necessary to set the conditions in the range of 1 minute to 5 seconds at a temperature of 00°C. If the heat energy is smaller than this condition, the resulting alkali silicate film will not be cured sufficiently, and if the heat energy is greater than the heat energy shown in the conditions, the nitric acid This is not preferable because dealkalization treatment with an aqueous solution is not carried out effectively, and alkali salts remain in the film, making it impossible to obtain the desired film. In addition,
From this point of view, it is desirable to avoid processing at 300°C for 1 minute.
次に、硝酸水溶液にて脱アルカリ処理し、アルカリ珪酸
塩皮膜中のアルカリ成分を除去し、且つ皮膜を安定化す
る。硝酸溶液の濃度は特に限定されないが、１０〜３０
％が取扱い上好ましい。また、より効果的に脱アルカリ
処理をするために硝酸溶液を加温してもよい。Next, dealkalization treatment is performed with an aqueous nitric acid solution to remove the alkali components in the alkali silicate film and stabilize the film. The concentration of the nitric acid solution is not particularly limited, but is 10 to 30
% is preferable for handling. Furthermore, the nitric acid solution may be heated in order to carry out the dealkalization treatment more effectively.
その後、直ちに水洗、乾燥して本発明の化成処理法は終
了する。Thereafter, the chemical conversion treatment method of the present invention is completed by immediately washing with water and drying.
なお、アルカリ珪酸塩皮膜の脱アルカリ処理のために塩
酸、硫酸等の酸水溶液の使用が考えられるが、このよう
な酸水溶液を使用した場合、脱アルカリは達成されるも
のの、厳しい腐食環境下での耐白変性の向上効果は小さ
いか或いは全くなく、適当でない。In addition, it is possible to use an acid aqueous solution such as hydrochloric acid or sulfuric acid for dealkalization treatment of an alkali silicate film, but when such an acid aqueous solution is used, dealkalization can be achieved, but it will not work in a severe corrosive environment. The effect of improving whitening fastness is small or not at all, which is not appropriate.
このことは、本発明におけるアルカリ珪酸塩皮膜の硝酸
水溶液処理は、単に脱アルカリのみでなく、該皮膜を一
層安定化する効果があることを示している。この点、前
述の特公昭５７−４３６３４号の方法でアルカリ珪酸塩
処理後、乾燥し、酸処理を行っているが、この酸処理は
皮膜表面に無数の微細孔を形成して次工程でのアルカリ
珪酸塩処理による微細孔充填に備えるためのものであっ
て、本発明における硝酸水溶液による脱アルカリ処理と
は基本的に目的及び作用効果が相違しているものである
。This shows that the nitric acid aqueous solution treatment of the alkali silicate film in the present invention not only deals with dealkalization, but also has the effect of further stabilizing the film. In this regard, the above-mentioned Japanese Patent Publication No. 57-43634 uses alkali silicate treatment followed by drying and acid treatment, but this acid treatment creates numerous micropores on the surface of the film, making it difficult to use in the next process. This treatment is to prepare for micropore filling by alkali silicate treatment, and is fundamentally different in purpose and effect from the dealkalization treatment with a nitric acid aqueous solution in the present invention.
次に本発明の実施例を示す。Next, examples of the present invention will be shown.
（実施例）
アルミニウム条（ＪＩＳ１１００Ｈ２６，５１８２Ｈ２
６相当）を常法に従って脱脂、水洗した後、第１表に示
すＳｉＯ２／Ｍ２０比のアルカリ珪酸塩水溶液（１００
ｇ／Ｑ）をロールコータで塗布し、同表に示す条件にて
焼付けた。引き続き、同表に示す条件にて脱アルカリ処
理した後、水洗、乾燥した。(Example) Aluminum strip (JIS1100H26, 5182H2
After degreasing and washing with water according to a conventional method, an aqueous alkali silicate solution (equivalent to 100
g/Q) was applied using a roll coater and baked under the conditions shown in the table. Subsequently, the product was subjected to dealkalization treatment under the conditions shown in the same table, followed by washing with water and drying.
得られた試料について、皮膜中のアルカリ成分を調べる
と共に耐白変性を評価した。その結果を第１表に併記す
る。The obtained samples were examined for alkaline components in the film and evaluated for whitening resistance. The results are also listed in Table 1.
なお、最終表面処理皮膜中のアルカリ成分（Ｎａ、Ｋ等
）はニス力により分析した。また耐白変性は、５０℃、
９８％相対湿度（ＲＨ）中に２０日間保持した後の外観
、及び１２０℃レトルト（水蒸気中）処理６０分後の外
観により、Ｏ（良）、Δ、×（悪）を付して評価した。Incidentally, the alkaline components (Na, K, etc.) in the final surface treatment film were analyzed by varnish strength. In addition, the white resistance is 50℃,
The appearance after being kept in 98% relative humidity (RH) for 20 days and the appearance after 60 minutes of 120°C retort treatment (in water vapor) was evaluated by assigning O (good), Δ, and × (bad). .
第１表より明らかなとおり、本発明材はいずれも耐白変
性が良好である。これに対し、アルカリ珪酸塩のＳｉＯ
□／Ｍ２０比が１未満の比較材Ｎα６は皮膜中にアルカ
リ成分がないが、耐白変性が不十分であり、焼付けの熱
エネルギーが多い比較材Ｈａ７は鼓膜中にアルカリ成分
が残存し、やはり耐白変性が不十分である。脱アルカリ
処理をしない比較材Ｎα８は皮膜中にアルカリ成分が残
存し、耐白変性が劣っている。焼付けの熱エネルギーが
少ない場合（比較材Ｎα８、Ｈａ ９ ）は、脱アルカ
リ処理の有無に拘わらす耐白変性が劣っている。なお、
塩酸による脱アルカリ処理（比較材Ｎα１０）では、皮
膜中にアルカリ成分は残存しないものの、耐白変性の向
上効果が小さい。As is clear from Table 1, all of the materials of the present invention have good resistance to whitening. On the other hand, the alkali silicate SiO
Comparative material Nα6, which has a □/M20 ratio of less than 1, has no alkaline components in the film, but has insufficient whitening resistance, and comparative material Ha7, which requires a lot of thermal energy for baking, has alkaline components remaining in the eardrum, and is still Insufficient white fastness. Comparative material Nα8, which was not subjected to alkalization treatment, had an alkali component remaining in the film and was inferior in whitening resistance. When the thermal energy of baking is low (comparative materials Nα8 and Ha 9 ), the whitening resistance is poor regardless of whether or not dealkalization treatment is performed. In addition,
In dealkalization treatment with hydrochloric acid (comparative material Nα10), although no alkaline component remains in the film, the effect of improving whitening resistance is small.
ｒ以下余白】
（発明の効果）
以上詳述したように、本発明によれば、アルミニウム材
に対してアルカリ珪酸塩による処理、焼付け、硝酸水溶
液による脱アルカリ処理を適用し、しかもこれらの処理
を相互に関連させて特定の条件で行うので、より厳しい
高温多湿の腐食環境下で、憂れた耐白変性を有するアル
ミニウム材を得ることができ、特にエアコン用フィン材
等に好適である。また、処理時間が短時間であるので経
済的でちり、連続的処理への適用も可能となる等の利点
がある。[Blank below r] (Effects of the invention) As detailed above, according to the present invention, treatment with an alkali silicate, baking, and dealkalization treatment with an aqueous nitric acid solution are applied to an aluminum material, and these treatments are Since the processes are carried out under specific conditions in relation to each other, it is possible to obtain an aluminum material with poor resistance to white discoloration in a more severe corrosive environment of high temperature and humidity, and it is particularly suitable for fin materials for air conditioners. Furthermore, since the processing time is short, it is economical, dust-free, and can be applied to continuous processing.
特許出願人 株式会社神戸製鋼所 代理人弁理士 中 村 尚Patent applicant: Kobe Steel, Ltd. Representative Patent Attorney Takashi Nakamura
Claims (1)
２Ｏ比（但し、ＭはＬｉ、Ｎａ、Ｋ等のアルカリ金属で
ある）が１以上のアルカリ珪酸塩で処理した後、２００
〜３００℃の温度にて１分〜５秒間焼付けし、次いで硝
酸水溶液により脱アルカリ処理を施すことを特徴とする
耐白変性に優れた化成処理法。Aluminum and aluminum alloys are SiO_2/M_
After treatment with an alkali silicate having a 2O ratio (where M is an alkali metal such as Li, Na, K, etc.) of 1 or more, 200
A chemical conversion treatment method with excellent whitening resistance, characterized by baking at a temperature of ~300°C for 1 minute to 5 seconds, followed by dealkalization treatment with an aqueous nitric acid solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6390888A JPH01240674A (en) | 1988-03-16 | 1988-03-16 | Chemical conversion treatment for forming silicate film excellent in whitening resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6390888A JPH01240674A (en) | 1988-03-16 | 1988-03-16 | Chemical conversion treatment for forming silicate film excellent in whitening resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01240674A true JPH01240674A (en) | 1989-09-26 |
Family
ID=13242900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6390888A Pending JPH01240674A (en) | 1988-03-16 | 1988-03-16 | Chemical conversion treatment for forming silicate film excellent in whitening resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01240674A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0585365A1 (en) * | 1991-05-22 | 1994-03-09 | Dancor, Inc. | Process for protecting metallic surfaces using silicate compounds |
| EP0701489A4 (en) * | 1992-11-20 | 1995-10-12 | Dancor Inc | Process for protecting a surface using silicate compounds |
| US6322687B1 (en) | 1997-01-31 | 2001-11-27 | Elisha Technologies Co Llc | Electrolytic process for forming a mineral |
| US6358616B1 (en) | 2000-02-18 | 2002-03-19 | Dancor, Inc. | Protective coating for metals |
-
1988
- 1988-03-16 JP JP6390888A patent/JPH01240674A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0585365A1 (en) * | 1991-05-22 | 1994-03-09 | Dancor, Inc. | Process for protecting metallic surfaces using silicate compounds |
| EP0585365A4 (en) * | 1991-05-22 | 1995-11-29 | Dancor Inc | Process for protecting metallic and wood surfaces using silicate compounds |
| EP0701489A4 (en) * | 1992-11-20 | 1995-10-12 | Dancor Inc | Process for protecting a surface using silicate compounds |
| EP0701489A1 (en) * | 1992-11-20 | 1996-03-20 | Dancor, Inc. | Process for protecting a surface using silicate compounds |
| US6322687B1 (en) | 1997-01-31 | 2001-11-27 | Elisha Technologies Co Llc | Electrolytic process for forming a mineral |
| US6358616B1 (en) | 2000-02-18 | 2002-03-19 | Dancor, Inc. | Protective coating for metals |
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