【発明の詳細な説明】[Detailed description of the invention]
（産業上の利用分野）
この発明は、りん酸塩処理性に優れたAlまた
はAl合金板、特に、表面にめつき層を備えたAl
またはAl合金板（以下、「Al板」と総称する）に
関する。
（従来の技術）
近年、自動車用鋼板には寒冷地における凍結防
止剤散布による腐食対策および燃費向上のための
軽量化対策の要求がますます強くなつてきてお
り、これに対応して各自動車メーカーは例えば、
Zn，Zn系合金めつき等の金属めつきを表面に施
した表面処理鋼板、あるいは薄くて強度の高い高
張力鋼板の自動車のボデイーパネル等への適用を
進めている。
しかし、今だ十分なる耐腐食性、軽量化は実現
されているとは言い難いのが実情である。
一方、従来用いられている冷延鋼板に代わり、
ボデイーパネル等へ軽くて腐食にも強いAlもし
くはAl合金からなるAl板を適用すれば前記要求
を飛躍的に向上させ得ることは可能であるが、か
かるAl板も、後述するりん酸塩処理性および塗
装の鮮映性の問題から極一部で使用されているに
すぎない。
（発明が解決すべき問題点）
ところで、自動車製造ラインでは一般に各パー
ツからボデイーを組み立てた後リン酸塩処理工程
に入る。このとき、ボデイーに鋼板から作られた
パーツとAl板から作られたパーツとが並用され
ればりん酸塩皮膜の形成、塗装後の鮮映性に問題
が生じることが知られている。
すなわち、りん酸塩処理浴でAl板を処理すれ
ば、りん酸塩処理浴中でAl表面が溶解し、その
ためりん酸塩浴中のAlイオンの蓄積が生じ、処
理しようとする全ての金属へのりん酸塩皮膜形成
が阻害されてしまう。この理由は、未だに解明さ
れてはいないが、浴中にわずかに数ppm以上の溶
存Alイオンが存在するだけで、金属上へのりん
酸塩皮膜の形成は、ほとんど行われないことが実
験的にも確認されている。
元来、高耐食性であるAl板製のパーツにおい
ては、りん酸塩皮膜の形成が行われなくとも耐食
性に関しては問題はあまりない。しかし、冷延鋼
板製のパーツにおいては、りん酸塩皮膜がない場
合、塗装後の耐食性が著しく劣つてくるため極め
て大きな問題となつてくる。つまり、りん酸塩処
理は不可欠である。
また、Al板をりん酸塩処理しても極めて少量
のりん酸塩皮膜しか生成されず、一方、十分なり
ん酸塩皮膜が形成された冷延鋼板との間に、表面
抵抗の差が生じ、塗装後の塗膜の光沢および鮮映
性に差が生じ、外観を損なうという困難がある。
そして、かかる困難はボデイーにAl板と鋼板
から作られたパーツが併用されている限り、不可
避というべきである。
従来、かかる問題の解決法として、りん酸塩浴
中にK+，F-イオンを添加する方法が知られてい
る。
K+，F-の添加は
Al3＋2K+＋Na+＋6F-→K2NaAlF6（沈澱物）
なる反応を利用してAlイオンを沈澱させて溶存
Alイオンを除去することにある。また同時にF-
の添加によりAl板上へのりん酸塩皮膜の形成を
可能とし上記問題の解消を図らんとするものであ
る。
ところが、Al板と鋼板を同時処理する場合、
両者の被処理面積の比によつて液組成および補給
量が異なり、同一のりん酸塩処理ラインで何種類
もの車種の製造を行う工場の場合、車種によつて
上記面積の比が異なり、実質上、適正範囲に処理
液成分を管理することは不可能に近い。
ここに、この発明はかかる問題を解消すること
を目的として、鋼板とAl板から作られたパーツ
を有するボデイーを同一のりん酸塩処理ラインで
処理することを可能とするのであつて、鋼板と同
程度のりん酸塩皮膜の形成および鮮映性が得られ
るようになしたりん酸塩処理性に優れたAl板を
提供するものである。
（問題点を解決するための手段）
発明者らは以上の問題を解決すべく鋭意検討を
続けたところ、Alの溶出を完全に阻止すべく適
宜金属でめつきをするとともに、当該金属として
りん酸塩処理化成性のすぐれた金属を選ぶことに
より、すぐれた効果が得られることを知り、本発
明を完成した。
ここにこの発明の要旨とするところは、鋼板と
Al板とを同一のりん酸塩処理ラインでりん酸塩
処理する際に使用するAl板であつて、表面にZn
めつき層、Zn系合金めつき層、またはFe系合金
めつき層のうちいずれかのめつき層を1g／m2以
上の付着量で有することを特徴とするりん酸塩処
理性に優れたAl板である。
すでに述べたようにAl板にりん酸塩処理を施
すには多くの困難があり、一方、Al板に直接塗
装を施すと塗膜の鮮映性が十分でない。しかしな
がら、上述のように、この発明にしたがつて、一
旦、めつき層を設けてから通常の冷延鋼板と同様
のりん酸延処理を行えば、従来のようにF-イオ
ンの共存を必要とせずにりん酸延処理が行え、し
かも得られる塗装性は冷延鋼板のそれと比較して
遜色ないものが得られるのである。
すなわち、この発明にかかるりん酸塩処理性に
優れたAl板は、表面に1g／m2以上のZnめつき層、
Zn系合金めつき層、Fe系合金めつき層のいずれ
かのめつき層を備えたものであり、素地を形成す
るAl板としては純Al板はもとより各種Al合金板
をも包含する。Al合金板の代表例としては、今
日自動車用として多く使われるAl−Mg系、Al−
Cu系、Al−Zn系の高力圧延材が挙げられる。
この発明において、上記Al板上に形成するめ
つき層としては、Znめつき層、Zn系合金めつき
層例えばZn−Fe，Zn−Co，Zn−Ni等、Fe系合
金めつき層例えばFe−Sb等があり、それらのい
ずれかを公知の電気めつきあるいは浸漬めつき法
により上記Al板上に形成する。したがつて、め
つき条件、めつき組成は特に制限されず、発明者
らの実験によればそれらのいずれについても通常
のめつき条件、めつき組成で満足のゆく結果が得
られた。
このように、この発明にあつてAl板上にめつ
き層を形成する理由は、すでに述べたようにめつ
き層にてりん酸塩処理液中でのAlの溶解を防ぐ
ためであり、またその皮膜組成をZn，Zn系合金、
Fe系合金とすることにより、Al板上にもりん酸
塩皮膜の形成が行えるのである。すなわち冷延鋼
板と同程度のりん酸塩比較の形成が行えるのであ
る。したがつて、その場合、そのめつき付着量を
1g／m2以上としたのは、めつき付着量が1g／m2
未満では母材のAl溶解を防止することができず、
めつき付着量以上にAl溶解が生じ浴中のAlイオ
ン濃度が上がり鋼板表面へのりん酸塩皮膜の形成
が損なわれるばかりでなく、Al板へのりん酸塩
皮膜の形成が阻止されるからである。一方、この
発明では、めつき付着量の上限は特に規定しない
が、余り厚いと加工性が損なわれるので、コスト
等の点から考えてその上限は通常5g／m2以下が
好ましい。
かくして、以上のようにAl板上にめつき層を
形成することにより、りん酸塩処理液中でのAl
の溶解が効果的に防止され且つめつき皮膜自体が
溶解し、冷延鋼板と同様のりん酸塩皮膜の形成が
行えるのである。
したがつて、この発明によれば、同一ラインで
同一処理液成分の処理液でAl板と冷延鋼板を並
用した製品、部分のりん酸塩処理が行え、塗装後
の塗膜の鮮映性も両者差のないものが得られる。
次に、この発明を実施例によつてさらに詳述す
る。
実施例
第１表に示す供試材Ａ（No.１〜３、No.５〜８は
Al単体板、No.４はAl99％−Mg1％のAl合金板、
No.９はC0.05％−Mn0.25％の冷延鋼板）を用い、
試験No.１のAl板およびNo.９の冷延鋼板の供試材
はめつきを行わず裸仕様のまま、No.２〜８の供試
材には、同表に示すめつき浴組成（硫酸塩浴）、
浴PH、めつき電流密度でZnめつき、Zn系合金め
つきおよびFe系合金めつきの各電気めつきを行
つてその表面に同表左欄に示すめつき層組成のめ
つきを施した。試験No.２のAl板供試材にはこの
発明の範囲外であるめつき付着量0.5g／m2のめつ
きを、試験No.３のAl板供試材には、この発明の
範囲内であるめつき付着量1.5g／m2のめつきを、
試験No.４のAl−MgのAl合金板の供試材にはめつ
き付着量5g／m2のめつきを、試験No.５〜８のAl
板供試材にはめつき付着量3g／m2のめつきをそ
れぞれ形成せしめ後、市販のりん酸塩処理用薬剤
（商品名“グラノジンク”、日本ペイント社製）を
用い標準的条件でそれぞれの供試材を２分間浸漬
してりん酸塩処理を行つた。得られた結果を第２
表にまとめて示す。第２表左欄には、処理液建浴
直後に第１表に示す各供試材Ａをりん酸塩処理し
たときのその表面に形成されたりん酸塩付着量
を、また同表右欄にはそれぞれの供試材を処理液
1l当たり0.5m2の割合で連続して処理したときそ
の表面に形成されたりん酸塩付着量とその時の処
理液中におけるAlイオン濃度を示す。
なお、試験No.１〜８のAl板もしくはAl合金板
を連続して処理したものではさらにその処理液で
冷延鋼板（第１表のNo.９の供試材と同じ）を処理
したところ、表中に供試材Ｂとして示す量のりん
酸付着量が得られた。この発明の場合、連続して
次々に供試材を処理してもりん酸塩付着量に実質
上差違がみられなかつた。つまり、本発明例の場
合、溶出Alイオン量は1ppm以下となり、りん酸
塩処理性に何ら影響を及ぼさない。
第３表は、前記建浴直後りん酸塩処理した供試
材Ａと0.5m2／ｌ処理したときの供試材Ａおよび
前述の供試材Ｂに対して市販の日本ペイント社製
パワートツプＵ−30を20μm厚にカチオン電着し、
その上面に同社製OTO 4810グレーを25μm厚に
中塗、さらに同社製OTO 626 白を30μm厚に上
塗した後の塗膜の鮮映性を調べた結果を示す。
ここに、「鮮映性」は鮮明度光沢度計（東京電
工(株)PGD−21−7794）を使つて測定した。
(Industrial Application Field) This invention relates to an Al or Al alloy plate with excellent phosphating properties, especially an Al plate with a plating layer on the surface.
Or related to Al alloy plates (hereinafter collectively referred to as "Al plates"). (Conventional technology) In recent years, there has been an increasing demand for automotive steel plates to take anti-corrosion measures by spraying antifreeze agents in cold regions, and to reduce weight to improve fuel efficiency. For example,
We are proceeding with the application of surface-treated steel sheets with metal plating such as Zn or Zn-based alloy plating, or thin, high-strength high-tensile steel sheets to automobile body panels. However, the reality is that it is still difficult to say that sufficient corrosion resistance and weight reduction have been achieved. On the other hand, instead of the conventionally used cold-rolled steel sheet,
It is possible to dramatically improve the above requirements by applying an Al plate made of lightweight and corrosion-resistant Al or Al alloy to body panels, etc., but such an Al plate also has the phosphate treatment property described below. However, due to problems with the clarity of the paint, it is only used in a small number of cases. (Problems to be Solved by the Invention) Incidentally, in an automobile manufacturing line, generally after a body is assembled from each part, a phosphate treatment process is started. At this time, it is known that if parts made from steel plates and parts made from aluminum plates are used together in the body, problems will occur due to the formation of a phosphate film and the sharpness of the image after painting. In other words, if an Al plate is treated in a phosphate bath, the Al surface will dissolve in the phosphate bath, resulting in the accumulation of Al ions in the phosphate bath, which will affect all the metals being treated. phosphate film formation is inhibited. The reason for this has not yet been elucidated, but it has been experimentally shown that the presence of only a few ppm or more of dissolved Al ions in the bath hardly forms a phosphate film on the metal. has also been confirmed. For parts made of Al plates, which are inherently highly corrosion resistant, there are not many problems with corrosion resistance even if a phosphate film is not formed. However, in the case of parts made of cold-rolled steel sheets, if there is no phosphate coating, the corrosion resistance after painting will be significantly degraded, which will become an extremely serious problem. In other words, phosphate treatment is essential. In addition, even if an Al plate is treated with phosphate, only a very small amount of phosphate film is generated, and on the other hand, a difference in surface resistance occurs between it and a cold-rolled steel sheet on which a sufficient phosphate film has been formed. However, there is a problem in that the gloss and sharpness of the coating film after painting differs, which impairs the appearance. Such difficulties are unavoidable as long as parts made of aluminum plates and steel plates are used together in the body. Conventionally, a method of adding K + and F - ions to the phosphate bath has been known as a solution to this problem. The addition of K + and F - uses the reaction Al 3 +2K + +Na + +6F - →K 2 NaAlF 6 (precipitate) to precipitate and dissolve Al ions.
The purpose is to remove Al ions. Also at the same time F -
The purpose is to make it possible to form a phosphate film on the Al plate by adding , and to solve the above problem. However, when processing Al plates and steel plates at the same time,
The liquid composition and replenishment amount vary depending on the ratio of the areas to be treated, and in the case of a factory that manufactures many types of cars on the same phosphate treatment line, the ratio of the areas mentioned above will differ depending on the car type, and the actual Moreover, it is nearly impossible to control the processing liquid components within an appropriate range. In order to solve this problem, the present invention makes it possible to process a body having parts made of a steel plate and an Al plate in the same phosphate treatment line. The object of the present invention is to provide an Al plate with excellent phosphate treatment properties that allows formation of a phosphate film and image clarity to the same level. (Means for Solving the Problems) The inventors continued to study intensively to solve the above problems, and found that they plated with appropriate metals to completely prevent the elution of Al, and also used phosphorus as the metal. The present invention was completed based on the knowledge that superior effects can be obtained by selecting metals with excellent acid salt treatment properties. The gist of this invention is that steel plates and
This is an Al plate used when phosphate treatment is performed on the same phosphate treatment line as Al plate, and the surface has Zn.
Excellent phosphate treatment properties characterized by having a plating layer, a Zn-based alloy plating layer, or an Fe-based alloy plating layer with an adhesion amount of 1 g/m 2 or more. It is an Al plate. As already mentioned, there are many difficulties in applying phosphate treatment to Al plates, and on the other hand, when painting directly on Al plates, the sharpness of the paint film is not sufficient. However, as mentioned above, according to the present invention, once a plating layer is provided and a phosphate rolling treatment is performed in the same way as for ordinary cold-rolled steel sheets, the coexistence of F - ions is required as in the conventional method. The phosphoric acid rolling treatment can be carried out without any oxidation, and the resulting paintability is comparable to that of cold-rolled steel sheets. That is, the Al plate with excellent phosphate treatment properties according to the present invention has a Zn plating layer of 1 g/m 2 or more on the surface,
It is equipped with either a Zn-based alloy plating layer or an Fe-based alloy plating layer, and the Al plate forming the base includes not only pure Al plate but also various Al alloy plates. Typical examples of Al alloy plates include Al-Mg type, Al-Mg type, which is often used in automobiles today.
Examples include Cu-based and Al-Zn-based high-strength rolled materials. In this invention, the plating layer formed on the Al plate includes a Zn plating layer, a Zn alloy plating layer such as Zn-Fe, Zn-Co, and Zn-Ni, and an Fe-based alloy plating layer such as Fe- Sb and the like are formed on the Al plate by a known electroplating or dip plating method. Therefore, the plating conditions and plating composition are not particularly limited, and according to experiments conducted by the inventors, satisfactory results were obtained under normal plating conditions and plating compositions. In this way, the reason for forming the plating layer on the Al plate in this invention is to prevent the dissolution of Al in the phosphate treatment solution by the plating layer, as mentioned above, and also to prevent the dissolution of Al in the phosphate treatment solution. The film composition is Zn, Zn-based alloy,
By using an Fe-based alloy, a phosphate film can also be formed on the Al plate. In other words, it is possible to form a phosphate comparison comparable to that of cold-rolled steel sheets. Therefore, in that case, the amount of plating
1g/m 2 or more means that the plating amount is 1g/m 2
If it is less than that, it is not possible to prevent Al dissolution in the base material,
This is because Al dissolution occurs in excess of the amount of plating deposited, increasing the Al ion concentration in the bath, which not only impairs the formation of a phosphate film on the steel plate surface, but also prevents the formation of a phosphate film on the Al plate. It is. On the other hand, in the present invention, the upper limit of the amount of plating is not particularly specified, but if it is too thick, workability will be impaired, so from the viewpoint of cost etc., the upper limit is usually preferably 5 g/m 2 or less. Thus, by forming a plating layer on the Al plate as described above, Al
This effectively prevents the dissolution of the plating film and dissolves the nail film itself, allowing the formation of a phosphate film similar to that of cold-rolled steel sheets. Therefore, according to the present invention, it is possible to perform phosphate treatment on products and parts of aluminum plates and cold-rolled steel plates using a treatment liquid with the same treatment liquid components on the same line, and the sharpness of the coating film after painting can be improved. You can also get the same results with both. Next, the present invention will be explained in further detail with reference to Examples. Example Sample material A shown in Table 1 (Nos. 1 to 3, Nos. 5 to 8 are
Al single plate, No. 4 is Al 99%-Mg1% Al alloy plate,
No. 9 uses cold-rolled steel plate (C0.05%-Mn0.25%),
Test No. 1 Al plate and No. 9 cold-rolled steel sheet specimens were left bare without plating, and test materials No. 2 to 8 were coated with the plating bath composition ( sulfate bath),
Electroplating of Zn plating, Zn-based alloy plating, and Fe-based alloy plating was performed at bath PH and plating current density, and the surface was plated with the plating layer composition shown in the left column of the same table. The Al plate sample material in Test No. 2 was plated with a plating amount of 0.5 g/ m2 , which is outside the scope of this invention, and the Al plate sample material in Test No. 3 was plated with a plating amount of 0.5 g/m2, which is outside the scope of this invention. The plating amount is 1.5g/ m2 , which is within
The test No. 4 Al-Mg Al alloy plate specimen was plated with a plating amount of 5 g/ m2 , and the test No. 5 to 8 Al
After forming a plating layer with a coating weight of 3 g/ m2 on each board sample, each plate was coated under standard conditions using a commercially available phosphate treatment agent (trade name "Granozinc", manufactured by Nippon Paint Co., Ltd.). The test material was immersed for 2 minutes to perform phosphate treatment. The obtained results are shown in the second
They are summarized in the table. The left column of Table 2 shows the amount of phosphate deposited on the surface of each sample material A shown in Table 1 that was phosphate treated immediately after preparation of the treatment solution, and the right column of the same table For each sample material, treat the treatment solution.
It shows the amount of phosphate deposited on the surface when treated continuously at a rate of 0.5 m 2 per liter and the Al ion concentration in the treated solution at that time. In addition, when the Al plates or Al alloy plates of Test Nos. 1 to 8 were continuously treated, a cold rolled steel plate (same as the sample material of No. 9 in Table 1) was further treated with the treatment solution. The amount of phosphoric acid deposited was obtained as shown in the table as Sample B. In the case of this invention, there was virtually no difference in the amount of phosphate deposited even when the test materials were treated one after another. In other words, in the case of the example of the present invention, the amount of eluted Al ions is 1 ppm or less, and does not affect the phosphate treatability in any way. Table 3 shows sample material A that was phosphate treated immediately after bath preparation, sample material A that was treated with 0.5 m 2 /l, and sample material B that was commercially available from Nippon Paint Co., Ltd. Power Top U. -30 was cationically electrodeposited to a thickness of 20 μm,
The results of examining the image clarity of the coating after the top surface was coated with OTO 4810 gray (made by the company) to a thickness of 25 μm and then OTO 626 white made by the company made to a thickness of 30 μm were applied as a top coat. Here, "sharpness" was measured using a sharpness gloss meter (Tokyo Denko Corporation PGD-21-7794).
【表】【table】
【表】【table】
【表】【table】
【表】
(注) ○：りん酸処理性良、×：不良
[Table] (Note) ○: Good phosphoric acid treatment property, ×: Poor
【表】
以上、第２表および第３表に示す結果より比較
例である試験No.１の供試材即ちめつきを施さずに
りん酸塩処理を行つたAl単体板の場合、建浴直
後、0.5m2／ｌ処理後でもりん酸塩付着量は共に
0.1g／m2とりん酸塩結晶はほとんど生成されずか
えつてその処理中にAlが溶解し0.5m2／ｌ処理後
においては液中に50ppmのAlイオンが溶存し、
このためこの処理液で、本来十分なりん酸塩結晶
が生成されるはずの冷延鋼板を処理してもAlイ
オン濃度が高いためその表面に形成されるりん酸
塩付着量は0.5g／m2と十分なりん酸塩結晶が生成
されていない。したがつて、いずれも塗装後の鮮
映性は悪い。
比較例である試験No.２の供試材、即ちAl板上
に0.5g／m2Fe−Znめつきを施したものは、Alイ
オン濃度が低い建浴直後ではめつき層の効果によ
りある程度のりん酸塩結晶が生成され塗装後の鮮
映性も悪くない。しかし、Alの溶解を完全に防
止することができず処理量に応じてAlイオン濃
度が高くなりりん酸塩処理性は低下する。0.5
m2／ｌ処理後では8ppmのAlイオンが溶存し、こ
のため前記と同様冷延鋼板には十分なりん酸塩結
晶が生成されず塗装後の鮮映性も悪くなる。
これに対して、本発明例である試験No.３〜No.８
の供試材、即ちAl板もしくはAl合金板上に1g／
m2以上のめつきを施したものは、そのめつき効果
によりAlの溶解が防止されると共に十分な量の
りん酸塩皮膜が生成され易くなり、0.5m2／ｌ処
理後においてもりん酸塩処理性は低下せず、その
Alイオン濃度は建浴後と同様1ppm以下であり、
またAl板またはAl合金板を0.5m2／ｌ処理したそ
の液で処理した冷延鋼板にもAl板もしくはAl合
金板の場合とほぼ同様の量のりん酸塩結晶が生成
されている。これは比較例である試験No.９の冷延
鋼板を連続処理したものと同程度である。したが
つて、塗装後の鮮映性についてもすぐれており、
またAl板もしくはAl合金板および冷延鋼板とも
に差が発生しない。
なお、第１表ないし第３表を通じて試験No.は同
一のものである。[Table] From the results shown in Tables 2 and 3 above, in the case of the test No. 1 sample material, which is a comparative example, that is, the Al single plate treated with phosphate without plating, the bathing Even after treatment with 0.5 m 2 /l, the amount of phosphate deposited remains the same.
At 0.1 g/m 2 , almost no phosphate crystals were formed, and on the contrary, Al was dissolved during the treatment, and after the 0.5 m 2 /l treatment, 50 ppm of Al ions were dissolved in the liquid.
Therefore, even if this treatment solution is used to treat a cold-rolled steel sheet, which should originally generate sufficient phosphate crystals, the amount of phosphate deposited on the surface is 0.5 g/m due to the high concentration of Al ions. 2 and not enough phosphate crystals are generated. Therefore, the image clarity after painting is poor in both cases. The sample material of Test No. 2, which is a comparative example, that is, 0.5 g/m 2 Fe-Zn plating on an Al plate, has a low Al ion concentration immediately after bath construction due to the effect of the plating layer. Phosphate crystals are formed, and the image clarity after painting is not bad. However, dissolution of Al cannot be completely prevented, and the Al ion concentration increases depending on the amount of treatment, resulting in a decrease in phosphate treatment properties. 0.5
After the m 2 /l treatment, 8 ppm of Al ions are dissolved, and therefore, as in the case described above, sufficient phosphate crystals are not formed in the cold rolled steel sheet, resulting in poor image clarity after painting. In contrast, Tests No. 3 to No. 8, which are examples of the present invention,
1g/ on the test material, i.e. Al plate or Al alloy plate.
When plated with a thickness of m 2 or more, the plating effect prevents the dissolution of Al and makes it easier to generate a sufficient amount of phosphate film, so that even after 0.5 m 2 /l treatment, phosphoric acid Salt treatability does not decrease;
The Al ion concentration is less than 1 ppm, same as after bath preparation.
In addition, phosphate crystals are formed in almost the same amount as in the case of the Al plate or Al alloy plate in the cold rolled steel plate treated with the solution obtained by treating the Al plate or Al alloy plate at a rate of 0.5 m 2 /l. This is comparable to that of the cold-rolled steel sheet of Test No. 9, which is a comparative example, and which was subjected to continuous treatment. Therefore, it has excellent image clarity after painting,
Further, no difference occurs between Al plate or Al alloy plate and cold rolled steel plate. Note that the test numbers are the same throughout Tables 1 to 3.
【特許請求の範囲】[Claims]
１ 合成樹脂もしくは合成樹脂をマトリツクスと
する複合材料成形物の表面に、表面に突状物を有
する樹枝状金属粉体と接着機能を有する合成樹脂
との配合物を、導電性を保有する如く塗布し、硬
化せしめ、金属粉体の一部が露出した状態で無電
解又は直接電解メツキ処理を施すことを特徴とす
る成形物の金属表面被覆処理方法。
1. A mixture of a dendritic metal powder having protrusions on the surface and a synthetic resin having an adhesive function is applied to the surface of a synthetic resin or a composite material molded product having a synthetic resin as a matrix so as to maintain conductivity. A method for coating a metal surface of a molded article, which comprises curing the metal powder and subjecting it to electroless or direct electrolytic plating with a portion of the metal powder exposed.