JPH0428882A - Aluminum alloy material having superior treatability with zinc phosphate - Google Patents
Aluminum alloy material having superior treatability with zinc phosphateInfo
- Publication number
- JPH0428882A JPH0428882A JP13568190A JP13568190A JPH0428882A JP H0428882 A JPH0428882 A JP H0428882A JP 13568190 A JP13568190 A JP 13568190A JP 13568190 A JP13568190 A JP 13568190A JP H0428882 A JPH0428882 A JP H0428882A
- Authority
- JP
- Japan
- Prior art keywords
- zinc phosphate
- alloy material
- colloidal silica
- treatment
- aluminum alloy
- 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
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 title claims abstract description 37
- 229910000165 zinc phosphate Inorganic materials 0.000 title claims abstract description 37
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 20
- 239000000956 alloy Substances 0.000 title claims abstract description 14
- 238000011282 treatment Methods 0.000 claims abstract description 30
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000008119 colloidal silica Substances 0.000 claims abstract description 16
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 19
- 239000011248 coating agent Substances 0.000 abstract description 12
- 238000000576 coating method Methods 0.000 abstract description 12
- 239000013078 crystal Substances 0.000 abstract description 3
- 238000000151 deposition Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract 2
- 238000005260 corrosion Methods 0.000 abstract 2
- 238000001556 precipitation Methods 0.000 description 15
- 239000000463 material Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 239000003973 paint Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 125000002091 cationic group Chemical group 0.000 description 4
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 4
- 238000004070 electrodeposition Methods 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000005238 degreasing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 230000001376 precipitating effect Effects 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 208000009205 Tinnitus Diseases 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- KHEMNHQQEMAABL-UHFFFAOYSA-J dihydroxy(dioxo)chromium Chemical compound O[Cr](O)(=O)=O.O[Cr](O)(=O)=O KHEMNHQQEMAABL-UHFFFAOYSA-J 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 231100000886 tinnitus Toxicity 0.000 description 1
Landscapes
- Chemical Treatment Of Metals (AREA)
Abstract
Description
（産業上の利用分野）
本発明はリン酸亜鈴処理性に優れるアルミニウム合金材
料に関するものであり、特に塗装下地として使用する場
合、優れた塗膜密着性と耐糸錆性が得られ、自動車パネ
ル等の用途に適している。
（従来の技術）
近年、アルミニウム合金は、軽量化を目的として自動車
の部品に採用されつつあるが、パネル材のように耐糸錆
性が要求される用途においては、クロム酸クロメート等
の塗装下地処理が必要とされていた。しかし、通常の自
動車塗装ラインの下地処理はリン酸亜鉛処理が採用され
ており、このような下地処理では耐糸錆性の点で充分な
効果が現状では得られていない。
（発明が解決しようとする課題）
このように、従来技術においては、例えばクロム酸クロ
メート処理の場合には耐糸錆性は向上できるが、更に以
下に示す工程が必要であり、また専用の処理設備が必要
で、且つ排水処理等を含めた処理コストが高くなるとい
う問題がある。
〔クロム酸クロメート処理工程〕
洗浄→水洗→水洗→クロム酸りロメート→水洗（注）→
水洗→乾燥。
（注）クローズドシステムによる排水処理が必要）
一方、素材のまま、従来の自動車塗装下地処理（リン酸
亜鉛処理）を施した場合には、カチオン電着後の塗膜密
着力が不充分となり、耐糸錆性の点で充分な性能が得ら
れ難い。
本発明は、上記従来技術の問題点を解決して、リン酸処
理を施した場合にリン酸亜鉛処理性に優れると共に充分
な耐糸錆性が得られる表面処理アルミニウム合金材料を
低コストで提供することを目的とするものである。
（課題を解決するための手段）
前記課題を解決するため、本発明者らは、低コストで耐
糸錆性に優れる塗装下地処理方法の開発について鋭意研
究を重ねた結果５アルミニウム合金の表面にリン酸亜鉛
を均一微細に析出させることにより、塗装後の耐糸錆性
向上に著しい改善効果が得られることを見い出した。
そのためには、アルミニウム合金材料の表面にコロイダ
ルシリカを析出させ、リン酸亜鉛析出の核として作用さ
せると、リン酸亜鉛の析出を均一微細化し、リン酸亜鉛
皮膜の改質を行うことができ、耐糸錆性の向上が可能で
あることを見い出し、ここに本発明をなしたものである
。
すなわち、本発明は、アルミニウム合金表面に０．１〜
２ｇ１０＋２のコロイダルシリカを析出させたことを特
徴とするリン酸亜鉛処理性に優れるアルミニウム合金材
料を要旨とするものである。
以下に本発明を更に詳述する。
（作用）
前述の如く、本発明においてアルミニウム合金表面に析
出させたコロイダルシリカは、リン酸亜鉛処理浴中でリ
ン酸亜鉛析出の核として作用し、均一微細なリン酸亜鉛
の結晶となる。
アルミニウム合金のリン酸亜鉛処理においては。
リン酸亜鉛浴浸漬初期は、アルミニウムの溶解のみが進
行し、リン酸亜鉛の析出が生じない誘導期間があるが、
析出核を増加することにより誘導期間を短くすることが
でき、析出量も増加させることが判明した６したがって
、本発明によれば、均一微細で、塗装仕上がり性、耐糸
錆性向上に必要充分な析出量が確保できるので、リン酸
亜鉛処理→カチオン電着→中塗装、上塗袋された、例え
ば自動車パネル材の表面性状や耐糸錆性を著しく向上で
きる。
コロイダルシリカの析出は、前述の通り、リン酸亜鉛浴
中でのリン酸亜鉛析出核として必要な量があればよく、
それ以上の析出は、塗装下地にコロイダルシリカが残留
するため好ましくない。すなわち、コロイダルシリカの
析出量がＯ，１ｇ／ｍ２未満では、リン酸亜鉛処理前の
脱脂洗浄工程での脱落等でリン酸亜鈴浴中の必要量が残
存しない場合が考えられるため、０．１ｇ／ｍ２を下限
値とする。
なお、析出状況やリン酸亜鉛処理工程によっては更に少
量でもよい。
コロイダルシリカの析出量の上限としては、リン酸亜鉛
処理後においてコロイダルシリカが層として存在しない
範囲であればよく、通常１ｇ／ｍ”が上限となるが、コ
ロイダルシリカの析出形態によっては、更に析出量を増
加させても問題はないため、本発明では２ｇ、７ｍ２を
上限とする。
アルミニウム合金材料表面にコロイダルシリカを析出さ
せる方法としては、単に浸漬→乾燥、或いはロールコー
タ−による塗布等、種々の方法が適用できる。析出量の
コントロールは、溶液中のコロイダルシリカ濃度を変更
することにより容易にできる。
本発明に係るアルミニウム合金材料を自動車パネルとし
て使用した場合、鉄との同時処理を行う必要上、リン酸
亜鉛処理が一般に施され、その後カチオン電着、中塗り
、上塗りが施されるが、その場合、リン酸亜鉛の析出量
が多く、且つ均一微細に析出するので、リン酸亜鉛処理
によって耐糸錆性が向上するため、耐糸錆性向上に関す
るユーザーニーズに充分応えることができる。
本発明で対象とするアルミニウム合金の成分系及び組成
は特に１ｉｌＪ限されるものではない。
以下に本発明の実施例を示す。
（実施例）
まず、素材としてＪＩＳ５１８２−０材の圧延板（１ｍ
ｍＸ ７５ｍｍＸ １５０ｍｍ）を準備した。
去１漬り。
上記５１８２合金板に第１表に示す種々の表面処理を施
した。得られた表面処理材を市販のりン酸亜鉛浴中で処
理し、析出量及び析出形態を調査した。その結果を第２
表に示す。
尖嵐衝又
実施例１で得られた表面処理材に自動車用パネル材と同
様の脱脂及び下地処理を行った後、カチオン電着塗装（
膜厚２５μｍ）を施し、表面仕上がり性と耐糸錆性の評
価を行った。下地処理はけい酸塩系脱脂洗浄→表面活性
化処理→リン酸亜鉛処理を採用した。耐糸錆性は、５サ
イクル後の耐糸錆性で評価した。それらの結果を第２表
に示す。
第２表より、本発明例は、いずれも、リン酸亜鉛処理性
に優れると共に、耐糸錆性及び表面仕上がり性（鮮映性
）も優れていることがわかる。(Industrial Application Field) The present invention relates to an aluminum alloy material that is highly resistant to tinnitus phosphate treatment, and particularly when used as a paint base, it provides excellent paint film adhesion and thread rust resistance, and is suitable for automobile panels. Suitable for applications such as (Prior art) In recent years, aluminum alloys have been used in automobile parts for the purpose of reducing weight, but in applications that require string rust resistance, such as panel materials, it is necessary to use a coating base such as chromate chromate. processing was required. However, zinc phosphate treatment is used as the base treatment for ordinary automobile painting lines, and such base treatment does not currently provide sufficient effects in terms of thread rust resistance. (Problems to be Solved by the Invention) As described above, in the conventional technology, for example, in the case of chromate treatment, thread rust resistance can be improved, but the following steps are additionally required, and a special treatment is required. There are problems in that it requires equipment and increases treatment costs including wastewater treatment. [Chromic acid chromate treatment process] Washing → Water washing → Water washing → Chromic acid chromate → Water washing (Note) →
Wash with water → dry. (Note: Wastewater treatment using a closed system is required.) On the other hand, if the material is subjected to conventional automotive paint base treatment (zinc phosphate treatment), the adhesion of the paint film after cationic electrodeposition will be insufficient. It is difficult to obtain sufficient performance in terms of thread rust resistance. The present invention solves the above-mentioned problems of the prior art and provides a surface-treated aluminum alloy material at a low cost that exhibits excellent zinc phosphate treatment properties and sufficient string rust resistance when subjected to phosphoric acid treatment. The purpose is to (Means for Solving the Problems) In order to solve the above problems, the present inventors have conducted extensive research on the development of a coating base treatment method that is low cost and has excellent thread rust resistance. It has been found that by uniformly and finely precipitating zinc phosphate, a remarkable improvement in thread rust resistance after painting can be obtained. To this end, colloidal silica is precipitated on the surface of the aluminum alloy material and acts as a nucleus for zinc phosphate precipitation, thereby making the zinc phosphate precipitation uniform and fine and improving the zinc phosphate film. It was discovered that thread rust resistance can be improved, and the present invention was developed based on this discovery. That is, in the present invention, the aluminum alloy surface has a
The gist of this invention is an aluminum alloy material that is characterized by precipitating 2g10+2 colloidal silica and has excellent zinc phosphate processability. The present invention will be explained in further detail below. (Function) As described above, in the present invention, the colloidal silica deposited on the aluminum alloy surface acts as a nucleus for zinc phosphate precipitation in the zinc phosphate treatment bath, and becomes uniform and fine crystals of zinc phosphate. In zinc phosphate treatment of aluminum alloys. At the initial stage of immersion in the zinc phosphate bath, there is an induction period in which only the dissolution of aluminum progresses and no precipitation of zinc phosphate occurs.
It has been found that by increasing the number of precipitation nuclei, the induction period can be shortened and the amount of precipitation can also be increased. Since a sufficient amount of precipitation can be ensured, the surface quality and thread rust resistance of, for example, automobile panel materials that have been subjected to zinc phosphate treatment, cationic electrodeposition, intermediate coating, and top coating can be significantly improved. As mentioned above, colloidal silica can be precipitated as long as the amount necessary as zinc phosphate precipitation nuclei in a zinc phosphate bath is sufficient.
Further precipitation is undesirable because colloidal silica remains on the coating base. In other words, if the amount of colloidal silica precipitated is less than 0.1 g/m2, the necessary amount may not remain in the dumbbell phosphate bath due to falling off during the degreasing and cleaning process before zinc phosphate treatment, so 0.1 g. /m2 is the lower limit. Note that an even smaller amount may be used depending on the precipitation situation and the zinc phosphate treatment process. The upper limit of the amount of colloidal silica precipitated is a range in which colloidal silica does not exist as a layer after zinc phosphate treatment, and the upper limit is usually 1 g/m, but depending on the form of colloidal silica precipitation, further precipitation may occur. In the present invention, there is no problem even if the amount is increased, so the upper limit is set at 2g and 7m2.There are various methods for depositing colloidal silica on the surface of the aluminum alloy material, such as simply dipping → drying, or coating with a roll coater. The method described above can be applied. The amount of precipitation can be easily controlled by changing the colloidal silica concentration in the solution. When the aluminum alloy material according to the present invention is used as an automobile panel, it is necessary to perform simultaneous treatment with iron. Above, zinc phosphate treatment is generally applied, followed by cationic electrodeposition, intermediate coating, and top coating, but in that case, the amount of zinc phosphate deposited is large and is uniformly finely deposited, so zinc phosphate treatment is performed. Since the thread rust resistance is improved by the above, it is possible to fully meet the user's needs regarding improvement of the thread rust resistance.The component system and composition of the aluminum alloy targeted by the present invention are not particularly limited to 1ilJ. Examples of the present invention will be described. (Example) First, a rolled plate of JIS5182-0 material (1 m
(mX 75mmX 150mm) was prepared. Pickled in the past. The 5182 alloy plate described above was subjected to various surface treatments shown in Table 1. The obtained surface-treated material was treated in a commercially available zinc phosphate bath, and the amount and form of precipitation were investigated. The result is the second
Shown in the table. The surface-treated material obtained in Example 1 was subjected to degreasing and base treatment similar to that used for automobile panel materials, and then cationic electrodeposition coating (
A film thickness of 25 μm) was applied, and the surface finish and thread rust resistance were evaluated. The base treatment was silicate-based degreasing cleaning → surface activation treatment → zinc phosphate treatment. The thread rust resistance was evaluated by the thread rust resistance after 5 cycles. The results are shown in Table 2. From Table 2, it can be seen that all of the examples of the present invention have excellent zinc phosphate treatment properties, as well as thread rust resistance and surface finish properties (image clarity).
（発明の効果）
以上詳述したように、本発明によれば、リン酸亜鉛の析
出量、形態が著しく向上でき、優れたリン酸亜鉛処理性
が得られるため、塗装仕上がり性、耐糸錆性が大幅に改
善できる。特に、自動車のパネル材として適用した場合
には、現在使用されている表面処理ライン（鉄用）で直
接処理が可能となり低コストであり、しかもリン酸亜鉛
処理で従来から最大の問題点であった耐糸錆性の問題が
解決できるので、その効果は顕著である。
特許出願人 株式会社神戸製鋼所
代理人弁理士 中 村 尚(Effects of the Invention) As detailed above, according to the present invention, the precipitation amount and form of zinc phosphate can be significantly improved, and excellent zinc phosphate treatment properties can be obtained, resulting in improved paint finish and thread rust resistance. performance can be significantly improved. In particular, when applied to automobile panel materials, it can be directly treated on currently used surface treatment lines (for iron), resulting in low cost, and it also eliminates the traditional problem of zinc phosphate treatment. The effect is remarkable because the problem of thread rust resistance can be solved. Patent applicant Hisashi Nakamura, patent attorney representing Kobe Steel, Ltd.
Claims (2)
コロイダルシリカを析出させたことを特徴とするリン酸
亜鉛処理性に優れるアルミニウム合金材料。(1) An aluminum alloy material with excellent zinc phosphate processability, characterized by having 0.1 to 2 g/m^2 of colloidal silica deposited on the surface of the aluminum alloy.
に記載のリン酸亜鉛処理性及び耐糸錆性に優れるアルミ
ニウム合金材料。(2) Claim 1 which is used for automobile panels
An aluminum alloy material having excellent zinc phosphate treatment properties and thread rust resistance as described in .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13568190A JPH0428882A (en) | 1990-05-25 | 1990-05-25 | Aluminum alloy material having superior treatability with zinc phosphate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13568190A JPH0428882A (en) | 1990-05-25 | 1990-05-25 | Aluminum alloy material having superior treatability with zinc phosphate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0428882A true JPH0428882A (en) | 1992-01-31 |
Family
ID=15157438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13568190A Pending JPH0428882A (en) | 1990-05-25 | 1990-05-25 | Aluminum alloy material having superior treatability with zinc phosphate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0428882A (en) |
-
1990
- 1990-05-25 JP JP13568190A patent/JPH0428882A/en active Pending
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