JPH0348275B2 - - Google Patents
Info
- Publication number
- JPH0348275B2 JPH0348275B2 JP21555884A JP21555884A JPH0348275B2 JP H0348275 B2 JPH0348275 B2 JP H0348275B2 JP 21555884 A JP21555884 A JP 21555884A JP 21555884 A JP21555884 A JP 21555884A JP H0348275 B2 JPH0348275 B2 JP H0348275B2
- Authority
- JP
- Japan
- Prior art keywords
- treatment
- chemical conversion
- aluminum
- conversion treatment
- film
- 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.)
- Expired
Links
- 239000000126 substance Substances 0.000 claims description 31
- 238000006243 chemical reaction Methods 0.000 claims description 30
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 claims description 30
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 25
- 229910052782 aluminium Inorganic materials 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 21
- 229910000831 Steel Inorganic materials 0.000 claims description 20
- 239000010959 steel Substances 0.000 claims description 20
- 238000000576 coating method Methods 0.000 claims description 18
- 239000011248 coating agent Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000010422 painting Methods 0.000 claims description 9
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims description 8
- 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 claims description 8
- 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 claims description 6
- 229910000165 zinc phosphate Inorganic materials 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 description 16
- 239000003973 paint Substances 0.000 description 12
- 239000000047 product Substances 0.000 description 10
- 238000005406 washing Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000004070 electrodeposition Methods 0.000 description 7
- 238000005238 degreasing Methods 0.000 description 6
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 229910052731 fluorine Inorganic materials 0.000 description 4
- 239000011737 fluorine Substances 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 238000010306 acid treatment Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- 125000002091 cationic group Chemical group 0.000 description 2
- 239000013066 combination product Substances 0.000 description 2
- 229940127555 combination product Drugs 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 238000007591 painting process Methods 0.000 description 2
- -1 potassium ferricyanide Chemical compound 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 229910002467 CrFe Inorganic materials 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 1
- XTEGARKTQYYJKE-UHFFFAOYSA-N chloric acid Chemical compound OCl(=O)=O XTEGARKTQYYJKE-UHFFFAOYSA-N 0.000 description 1
- 229940005991 chloric acid Drugs 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000013527 degreasing agent Substances 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 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
- C23C22/73—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 characterised by the process
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)
- Other Surface Treatments For Metallic Materials (AREA)
Description
〔産業上の利用分野〕
本発明は、アルミ材と鋼材が組合された製品の
化成処理方法に関するものである。
〔従来技術〕
従来、鋼板製ワークを電着塗装する場合は、該
ワークをまずフツ素系化成処理液にて化成処理
し、しかる後上記塗装を行なうようにしている。
これは上記化成処理により鋼板の表面にリン酸亜
鉛被膜を形成して防錆効果を向上するとともに、
塗膜の密着性を向上するためである。
一方、アルミ材からなるワークの塗装に際して
は、これをクロム酸を含む処理液に浸漬しクロメ
ート処理することが行なわれており、これは該ワ
ーク表面にクロム酸被膜を形成し、上記鋼板製ワ
ークの場合と同様に塗膜の密着性等を向上するた
めである。
ところでワーク、例えば自動車の車体等には、
鋼材とアルミ材とを組合せてなるものがあり、こ
のような組合せてなる製品を塗装する場合は、従
来、上記鋼板製ワーク、アルミ材製ワークを別々
に被膜形成処理し、しかる後両者を組合せて塗装
するようにしていた。
しかしながら上記組合された製品の中には、上
記被膜形成処理後に両ワークを組合せる組付作業
を設けると、化成処理された鋼板製ワークの下流
側に組付作業を設けることとなり、ゴミの付着
や、各外板に作業者の油などが付着し、電着がう
まく行えなかつたり、電着後のブツブツの突起や
肌あれ等の問題が生じることとなり、塗装工程の
都合上困難なものがあり、このような場合は、ま
ず両ワークを組合せ、しかる後クロメート処理、
化成処理の被膜形成処理を順次行なうことが考え
られるが、このようにすると、鋼板製ワークにも
本来不要のクロメート処理が施こされて不経済で
あるばかりでなく、組合された製品の大きさに応
じたクロメート処理装置が必要となり、装置全体
が大がかりなものとなつてしまう問題が生じる。
また、一方このようなクロメート処理装置の問題
を回避するため、上記組合せ製品をクロメート処
理することなく化成処理することも考えられる
が、このようにすると、アルミ材製ワークの塗膜
の密着性が低下するという問題が生じる。
〔発明の目的〕
本発明は、上記従来の状況においてなされたも
ので、装置が大型化してしまうことなく、アルミ
材ワーク、及び鋼材ワークの塗膜の密着性を向上
できるアルミ材と鋼材が組合された製品の化成処
理方法を提供することを目的としている。
〔発明の構成〕
本発明者は、アルミ材をそのまま化成処理する
とZnFe（PO4）24H2O等の被膜が形成され、この
被膜が塗膜の密着性を阻害するが、アルミ材にク
ロメート処理を施きした後であれば化成処理を施
こしても上記被膜は形成されない点を見い出して
本発明をなしたものであり、即ち本発明は、アル
ミ材と鋼材が組合された製品の化成処理方法にお
いて、アルミ材をクロメート処理した後に鋼材と
組合せ、しかる後該組合せ製品を化成処理するよ
うにしたものであり、これによりアルミ材に上記
塗膜の密着性を阻害する被膜が形成されることな
く、組合せ製品を化成処理できるようにしたもの
である。
〔実施例〕
以下、本発明の実施例を図について説明する。
第１図は本発明の一実施例を説明するための工
程図であり、１は鋼板を用いて、例えば車体にプ
レス成形するための第１プレス工程、２はアルミ
板を用いて、例えばボンネツトにプレス成形する
ための第２プレス工程、３は上記ボンネツトをク
ロメート処理するためのクロメート処理工程、４
は上記第１プレス工程１からの鋼板製車体に上記
クロメート処理が施こされたアルミ板製ボンネツ
トを組付けるための組付工程、５は上記ボンネツ
トが組付けられた車体に化成処理を施こすための
化成処理工程、６はこの化成処理された車体及び
ボンネツトを塗装するための塗装工程である。
第２図は、上記クロメート処理工程３の詳細を
示し、該クロメート処理では、まず、50℃のリン
酸ソーダ、ケイ酸ソーダの１〜３％溶液にて脱脂
３ａが行なわれ、水洗３ｂの次にデオキシジンに
より中和３ｃが行なわれ、さらに水洗３ｄの後ク
ロム酸処理３ｅが行なわれる。このクロム酸処理
３ｅは、クロム酸（CrO3）、フツ化水素（HF）、
及びフエリシアン化カリ（K5Fe（CN）6）の溶液
に浸漬して行なう。そしてこのクロム酸処理３ｅ
の後水洗３ｆ、湯洗３ｇ、及び乾燥３ｈが行なわ
れ、これによりクロメート処理工程３は終了す
る。
第３図は上記化成処理工程５の詳細を示し、該
化成処理では、湯洗５ａ後、上記クロメート処理
工程３の脱脂３ａと同様の処理液にて脱脂５ｂが
行なわれ、ついで水洗５ｃ後上記中和３ｃと同様
にして表面調整５ｄが行なわれ、さらにフツ素系
リン酸亜鉛溶液（フツ酸塩、硝酸塩、塩素酸等を
含有する。）に浸漬するリン酸亜鉛処理５ｅが行
なわれ、そしてこのリン酸亜鉛処理５ｅの後に水
洗５ｆ、及び乾燥５ｇが行なわれ、これにより化
成処理工程５は終了する。
第４図は上記塗装工程６の詳細を示し、この塗
装においては、まず、エポキシ樹脂系塗料を用い
て製品を陰極とするカチオン電着により、主とし
て防錆を目的とする下塗６ａが行なわれ、次にメ
ラミンアルキド樹脂系塗料を用いて静電塗装によ
り、主として下塗のピンホールや凹凸を埋めるた
めの中塗６ｂが行なわれ、さらにこの中塗と略同
様にして、主として美観の付与と環境に対する耐
久性を向上するための上塗６ｃが行なわれる。
このように本実施例方法では、まず、アルミ材
ワークであるボンネツトにクロメート処理を施こ
し、次にこのボンネツトを鋼材ワークである車体
に取付け、両者に化成処理を施こしたので、ボン
ネツトの表面にクロム酸皮膜（CrFe（CN）6・Cr
（OH）3・H2CrO4・4Al2O2・8H2O）が形成され、
該皮膜により、アルミ材をそのまま化成処理した
場合にアルミ材に形成され、塗膜の密着性に有害
な皮膜（ZnFe（PO4）2・4H2O）が形成されるの
を防止でき、ボンネツトへの塗膜の密着性が低下
するのを防止できる。またこの際ボンネツトだけ
をクロメート処理するようにしたので、クロメー
ト処理装置が大型化することもなく、また化成処
理の前に車体とボンネツトとを組合せるようにし
たので、塗装ラインでは組付工程は含まれず、組
合せ時のゴミや油等は化成処理時の脱脂、水洗で
洗い流されているためそのまま電着塗装に流すこ
とができ、従来の化成処理後に組付工程を有する
方法における電着塗装時のゴミ、油等の付着によ
り生じる不具合を解消することができる。
次に、上記実施例方法により形成された塗膜の
密着性試験について説明する。
本密着性試験は、アルミ材にクロメート処理後
化成処理を施こして塗装した場合の塗膜の密着力
が、クロメート処理をすることなく化成処理のみ
施こして塗装した場合の密着力より大きいことを
確認するための試験である。
〔〕 前処理及び塗装条件
(1) 前処理
脱脂…ケイ酸塩、リン酸塩からなるPH11
〜12、45℃のシリケートタイプのアルカリ
脱脂剤浴に２分間浸漬した。
化成処理…45℃のフツ素系リン酸亜鉛溶
液浴に３分間浸漬した。
クロメート処理…クロム酸、フツ化水
素、フエリシアン化カリ溶液浴にクロムが
100mg／m2又は80mg／m2付着する時間浸漬
した。
(2) 塗装
下塗…カチオン電着、膜厚20μｍ
中塗…メラミン系塗料のスプレー、膜厚
35μｍ
上塗…ソリツド系塗料のスプレー、膜厚
35μｍ
〔〕 試験方法
上記化成処理のみを施こしたもの、クロメー
ト処理（クロム量100mg／m2）後化成処理を施
こしたもの、クロメート処理（クロム量80mg／
m2）後化成処理を施こしたものをそれぞれ試験
片Ａ、Ｂ、Ｃとし、各試験片Ａ、Ｂ、Ｃを50℃
の温水に240hr浸漬、しかる後ごばん目試験を
行ない、この場合の塗膜残存率でもつて塗膜の
密着性を評価した。
ここでごばん目試験は、上記試験片に２mm間
隔で上下、左右方向の刃物傷をつけて100個の
ごばん目を形成し、これにセロテープを貼付
け、これを剥離した場合に上記100個のごばん
目のうち何個数が試験片に残存するかを試験す
るもので、勿論この残存したごばん目の数量が
多いほど密着性が高いこととなる。
〔〕 試験結果
[Industrial Application Field] The present invention relates to a chemical conversion treatment method for a product made of a combination of aluminum and steel. [Prior Art] Conventionally, when a workpiece made of a steel plate is subjected to electrodeposition coating, the workpiece is first chemically treated with a fluorine-based chemical conversion treatment liquid, and then the above-mentioned coating is applied.
This is done by forming a zinc phosphate coating on the surface of the steel sheet through the chemical conversion treatment described above, which improves the rust prevention effect.
This is to improve the adhesion of the coating film. On the other hand, when painting workpieces made of aluminum, the workpiece is immersed in a treatment solution containing chromic acid for chromate treatment, which forms a chromate film on the surface of the workpiece and This is to improve the adhesion of the coating film as in the case of . By the way, for workpieces such as car bodies,
Some products are made by combining steel materials and aluminum materials, and when painting products made of such a combination, conventionally, the steel plate workpiece and the aluminum material workpiece are treated to form coatings separately, and then the two are combined. I was trying to paint it. However, in some of the above-mentioned combined products, if an assembly operation is performed to combine both workpieces after the above-mentioned film formation treatment, the assembly operation will be performed downstream of the chemically treated steel plate workpiece, which will cause dust to adhere. In addition, oil from the worker may adhere to each outer panel, making it difficult to perform electrodeposition properly, or causing problems such as uneven protrusions and rough skin after electrodeposition, which may be difficult due to the painting process. Yes, in such a case, first combine both works, then chromate treatment,
It is conceivable to sequentially perform the film forming treatment of chemical conversion treatment, but doing so would not only be uneconomical as unnecessary chromate treatment would also be applied to the steel plate workpiece, but would also reduce the size of the assembled product. A chromate treatment device corresponding to the above is required, which causes the problem that the entire device becomes large-scale.
On the other hand, in order to avoid such problems with the chromate treatment equipment, it is possible to chemically treat the above combination product without chromate treatment, but in this case, the adhesion of the coating film on the aluminum workpiece will be reduced. The problem arises that the amount of energy decreases. [Object of the Invention] The present invention has been made in the above-mentioned conventional situation, and is a combination of aluminum and steel materials that can improve the adhesion of coatings on aluminum workpieces and steel workpieces without increasing the size of the device. The purpose of this research is to provide a method for chemical conversion treatment of manufactured products. [Structure of the Invention] The present inventor has discovered that when aluminum material is subjected to chemical conversion treatment, a film such as ZnFe (PO 4 ) 2 4H 2 O is formed, and this film inhibits the adhesion of the paint film. The present invention was made based on the discovery that the above-mentioned film will not be formed even if a chemical conversion treatment is applied after the treatment. In the treatment method, the aluminum material is subjected to chromate treatment and then combined with steel material, and then the combined product is subjected to chemical conversion treatment, whereby a film is formed on the aluminum material that inhibits the adhesion of the above-mentioned coating film. This makes it possible to chemically treat the combination product without having to do so. [Example] Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a process diagram for explaining one embodiment of the present invention, in which 1 is a first press step for press forming, for example, a car body using a steel plate, and 2 is a process diagram for press forming, for example, a bonnet using an aluminum plate. 3 is a chromate treatment step for chromate treatment of the bonnet; 4 is a chromate treatment step for chromate treatment of the bonnet;
5 is an assembly process for assembling the chromate-treated aluminum plate bonnet to the steel plate car body from the first pressing process 1, and 5 is a chemical conversion treatment for the car body to which the bonnet has been assembled. 6 is a coating process for painting the chemically treated car body and bonnet. FIG. 2 shows the details of the chromate treatment step 3. In the chromate treatment, first, degreasing 3a is performed with a 1-3% solution of sodium phosphate and sodium silicate at 50°C, followed by washing with water 3b. Next, neutralization 3c is performed with deoxydine, and further, after washing with water 3d, chromic acid treatment 3e is performed. This chromic acid treatment 3e consists of chromic acid (CrO 3 ), hydrogen fluoride (HF),
and immersion in a solution of potassium ferricyanide (K 5 Fe(CN) 6 ). And this chromic acid treatment 3e
After that, 3 f of washing with water, 3 g of washing with hot water, and 3 h of drying are performed, thereby completing the chromate treatment step 3. FIG. 3 shows details of the chemical conversion treatment step 5. In the chemical conversion treatment, after hot water washing 5a, degreasing 5b is performed using the same treatment liquid as the degreasing 3a in the chromate treatment step 3, and then after water washing 5c, the above-mentioned degreasing is performed. Surface conditioning 5d is performed in the same manner as neutralization 3c, and zinc phosphate treatment 5e is performed by dipping in a fluorine-based zinc phosphate solution (containing fluorine, nitrate, chloric acid, etc.), and After this zinc phosphate treatment 5e, water washing 5f and drying 5g are performed, thereby completing the chemical conversion treatment step 5. FIG. 4 shows the details of the above-mentioned painting process 6. In this painting, first, an undercoat 6a is applied mainly for the purpose of rust prevention by cationic electrodeposition using an epoxy resin paint with the product as a cathode. Next, an intermediate coat 6b is applied by electrostatic painting using a melamine alkyd resin paint, mainly to fill in the pinholes and unevenness of the undercoat.Furthermore, in almost the same manner as this intermediate coat, the main coating is to give a beautiful appearance and to improve durability against the environment. A top coat 6c is applied to improve the quality. As described above, in the method of this embodiment, the bonnet, which is an aluminum workpiece, is first subjected to chromate treatment, and then this bonnet is attached to the car body, which is a steel workpiece, and the chemical conversion treatment is applied to both, so that the surface of the bonnet is Chromic acid film (CrFe(CN) 6・Cr
(OH) 3・H 2 CrO 4・4Al 2 O 2・8H 2 O) is formed,
This film prevents the formation of a film (ZnFe(PO 4 ) 2 4H 2 O) that is harmful to the adhesion of the paint film, which is formed on the aluminum material when the aluminum material is subjected to chemical conversion treatment. It is possible to prevent the adhesion of the coating film from decreasing. In addition, since only the bonnet was subjected to chromate treatment, the chromate treatment equipment did not need to be enlarged, and since the car body and bonnet were assembled before the chemical treatment, the assembly process on the painting line was simple. It does not contain dirt and oil during assembly, and is washed away by degreasing and washing with water during chemical conversion treatment, so it can be directly applied to electrodeposition coating, and during electrodeposition coating using the conventional method that has an assembly process after chemical conversion treatment. It is possible to eliminate problems caused by adhesion of dirt, oil, etc. Next, an adhesion test of the coating film formed by the method of the above example will be explained. This adhesion test shows that the adhesion of a paint film applied to aluminum after chromate treatment and then chemical conversion treatment is greater than the adhesion force when applied only to chemical conversion treatment without chromate treatment. This is a test to confirm. [] Pre-treatment and painting conditions (1) Pre-treatment Degreasing...PH11 consisting of silicate and phosphate
~12, immersed in a 45°C silicate type alkaline degreaser bath for 2 minutes. Chemical conversion treatment: Immersed in a fluorine-based zinc phosphate solution bath at 45°C for 3 minutes. Chromate treatment...Chromium is present in chromic acid, hydrogen fluoride, and potassium ferricyanide solution baths.
It was immersed for a time of 100mg/ m2 or 80mg/ m2 . (2) Painting Undercoating...Cationic electrodeposition, film thickness 20μm Intermediate coating...Melamine paint spray, film thickness
35μm Top coat...Solid paint spray, film thickness
35μm [] Test method: Those subjected to the above chemical conversion treatment only, those subjected to chemical conversion treatment after chromate treatment (chromium amount 100 mg/m 2 ), chromate treatment (chromium amount 80 mg/m 2 )
m2 ) Test pieces A, B, and C were subjected to post-chemical conversion treatment, and each test piece A, B, and C were heated at 50°C.
The film was immersed in hot water for 240 hours, and then a second eye test was conducted, and the adhesion of the paint film was evaluated based on the paint film residual rate in this case. Here, in the cross-cut test, 100 cross-cuts are made by making knife scratches in the vertical and horizontal directions at 2 mm intervals on the above test piece, and Sellotape is attached to this, and when this is peeled off, the above 100 scratches are This is a test to determine how many of the squares remain on the test piece, and of course, the greater the number of remaining squares, the higher the adhesion. 〔〕 Test results
以上のように本発明に係るアルミ材と鋼材が組
合された製品の化成処理方法によれば、アルミ材
をクロメート処理した後鋼材と組合せ、しかる後
両者を化成処理するようにしたので、化成処理に
よる塗膜密着性に有害な皮膜がアルミ材に形成さ
れるのを防止でき、塗膜のアルミ材への密着性を
大きく向上できる効果がある。
As described above, according to the chemical conversion treatment method for a product in which aluminum and steel materials are combined according to the present invention, the aluminum material is chromate-treated and then combined with the steel material, and then both are subjected to chemical conversion treatment. This has the effect of preventing the formation of a film on aluminum material that is harmful to the adhesion of the paint film, and greatly improving the adhesion of the paint film to the aluminum material.
第１図は本発明の一実施例によるアルミ材と鋼
材が組合された製品の化成処理方法の工程図、第
２図はそのクロメート処理部分の詳細工程図、第
３図はその化成処理部分の詳細工程図、第４図は
その塗装部分の詳細工程図である。
３……クロメート処理工程、４……組付工程、
５……化成処理工程。
Figure 1 is a process diagram of a chemical conversion treatment method for a product combining aluminum and steel materials according to an embodiment of the present invention, Figure 2 is a detailed process diagram of the chromate treatment part, and Figure 3 is a process diagram of the chemical conversion treatment part. Detailed process diagram, Figure 4 is a detailed process diagram of the painted part. 3... Chromate treatment process, 4... Assembly process,
5...Chemical conversion treatment step.
Claims (1)
被膜処理する方法であつて、アルミ材を脱脂、水
洗後クロム酸を含む処理液にてクロメート処理
し、該クロメート処理されたアルミ材を鋼材と組
合せ、該組合された製品の状態で化成処理液で化
成処理を行ない鋼材にリン酸亜鉛被膜が形成され
るようにしたことを特徴とするアルミ材と鋼材が
組合された製品の化成処理方法。1 A method of coating a product made of aluminum and steel before painting, in which the aluminum is degreased and washed with water, then chromate treated with a treatment solution containing chromic acid, and the chromate-treated aluminum is applied to the steel. A method for chemical conversion treatment of a product made of aluminum and steel, characterized in that the combined product is subjected to chemical conversion treatment with a chemical conversion treatment liquid so that a zinc phosphate coating is formed on the steel. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21555884A JPS6196074A (en) | 1984-10-15 | 1984-10-15 | Chemical conversion treatment of product consisting of combined aluminum material and steel material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21555884A JPS6196074A (en) | 1984-10-15 | 1984-10-15 | Chemical conversion treatment of product consisting of combined aluminum material and steel material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6196074A JPS6196074A (en) | 1986-05-14 |
| JPH0348275B2 true JPH0348275B2 (en) | 1991-07-23 |
Family
ID=16674415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21555884A Granted JPS6196074A (en) | 1984-10-15 | 1984-10-15 | Chemical conversion treatment of product consisting of combined aluminum material and steel material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6196074A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0759755B2 (en) * | 1988-05-02 | 1995-06-28 | スカイアルミニウム株式会社 | Method for manufacturing A-l alloy coated plate for automobiles having excellent system rust resistance |
| JP2787478B2 (en) * | 1989-07-27 | 1998-08-20 | 旭テック株式会社 | Surface structure of chemical conversion coating on aluminum alloy workpiece |
| JPH0361384A (en) * | 1989-07-27 | 1991-03-18 | Asahi Tec Corp | Structure of surface part of chemical conversion film in material to be coated which is made of aluminum alloy |
| JP2713809B2 (en) * | 1990-08-27 | 1998-02-16 | 日本パーカライジング株式会社 | Method of forming electrodeposition base coat |
| US5645706A (en) * | 1992-04-30 | 1997-07-08 | Nippondenso Co., Ltd. | Phosphate chemical treatment method |
| JP4648058B2 (en) * | 2005-04-01 | 2011-03-09 | 日本パーカライジング株式会社 | Phosphate treatment method and electrodeposition coating treatment method for automobile body |
-
1984
- 1984-10-15 JP JP21555884A patent/JPS6196074A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6196074A (en) | 1986-05-14 |
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