JP2007254866A - Plating pretreatment method for aluminum or aluminum alloy raw material - Google Patents
Plating pretreatment method for aluminum or aluminum alloy raw material Download PDFInfo
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Abstract
Description
本発明は、アルミニウムまたはアルミニウム合金素材のめっき前処理方法に関し、特に、アルミニウムまたはアルミニウム合金素材にニッケルめっき皮膜などのめっき皮膜を形成する前に素材とめっき皮膜の密着性を向上させるために行うめっき前処理方法に関する。 The present invention relates to a plating pretreatment method for aluminum or an aluminum alloy material, and in particular, plating performed to improve the adhesion between the material and the plating film before forming a plating film such as a nickel plating film on the aluminum or aluminum alloy material. It relates to a pretreatment method.
アルミニウムは表面に酸化皮膜を形成し易いため、通常のめっき工程では、アルミニウム基材上に十分な密着性のめっき皮膜を形成するのが困難である。そのため、従来では、アルミニウム基材にめっきを施す前に、ジンケート処理と呼ばれる前処理が行われている。このジンケート処理は、脱脂処理およびエッチング処理を施したアルミニウム基材の表面に亜鉛の置換皮膜を形成する処理であり、この置換亜鉛皮膜上に通常のめっきが施されている。しかし、このようなジンケート処理を行ってもアルミニウム基材とめっき皮膜の密着性が十分でないため、一般にダブルジンケート処理と呼ばれる前処理が行われている（例えば、非特許文献１参照）。このダブルジンケート処理は、第１回目のジンケート処理によって形成された置換亜鉛皮膜を硝酸で溶解し、再度ジンケート処理を行って置換亜鉛皮膜を形成する方法である。この第２回目のジンケート処理によって形成された置換亜鉛皮膜は、第１回目のジンケート処理後の置換亜鉛皮膜よりも緻密で均一であり、アルミニウム基材とめっき皮膜の密着性を向上させることができる。 Since aluminum easily forms an oxide film on the surface, it is difficult to form a sufficiently adherent plating film on an aluminum substrate in a normal plating process. Therefore, conventionally, a pretreatment called a zincate treatment is performed before plating the aluminum substrate. This zincate treatment is a treatment for forming a zinc replacement film on the surface of an aluminum base material that has been subjected to a degreasing process and an etching process, and normal plating is applied on the replacement zinc film. However, even if such a zincate treatment is performed, the adhesion between the aluminum substrate and the plating film is not sufficient, and thus a pretreatment generally called a double zincate treatment is performed (for example, see Non-Patent Document 1). This double zincate treatment is a method in which the substituted zinc coating formed by the first zincate treatment is dissolved with nitric acid, and the zincate treatment is performed again to form a substituted zinc coating. The substituted zinc film formed by the second zincate treatment is denser and more uniform than the substituted zinc film after the first zincate treatment, and can improve the adhesion between the aluminum substrate and the plating film. .
しかし、ダブルジンケート処理を行っても、アルミニウムまたはアルミニウム合金素材とめっき皮膜の密着性を向上させることができるものの、めっき皮膜の耐食性は十分に満足することができなかった。 However, even if the double zincate treatment is performed, the adhesion between the aluminum or aluminum alloy material and the plating film can be improved, but the corrosion resistance of the plating film cannot be fully satisfied.
したがって、本発明は、このような従来の問題点に鑑み、アルミニウムまたはアルミニウム合金素材とめっき皮膜の密着性を良好に維持しながら、めっき皮膜の耐食性を向上させることができる、アルミニウムまたはアルミニウム合金素材のめっき前処理方法を提供することを目的とする。 Therefore, in view of such conventional problems, the present invention provides an aluminum or aluminum alloy material that can improve the corrosion resistance of the plating film while maintaining good adhesion between the aluminum or aluminum alloy material and the plating film. An object of the present invention is to provide a plating pretreatment method.
本発明者らは、上記課題を解決するために鋭意研究した結果、アルミニウムまたはアルミニウム合金素材にダブルジンケート処理を施した後に、さらに第３回目の硝酸浸漬処理とジンケート処理を施すことにより、ダブルジンケート処理を施した場合と同様にアルミニウムまたはアルミニウム合金素材とめっき皮膜の密着性を良好に維持しながら、ダブルジンケート処理を施した場合と比較して非常に優れた耐食性のめっき皮膜を得ることができることを見出し、本発明を完成するに至った。 As a result of diligent research to solve the above problems, the present inventors have performed double zincate treatment on an aluminum or aluminum alloy material, and then performed a third nitric acid dipping treatment and zincate treatment to obtain a double zincate. It is possible to obtain a plating film with extremely superior corrosion resistance compared to the case where double zincate treatment is performed while maintaining good adhesion between the aluminum or aluminum alloy material and the plating film as in the case where the treatment is performed. As a result, the present invention has been completed.
すなわち、本発明によるアルミニウムまたはアルミニウム合金素材のめっき前処理方法は、アルミニウムまたはアルミニウム合金素材に脱脂処理およびエッチング処理を施した後、素材を硝酸溶液に浸漬して第１回目の硝酸浸漬処理を行った後にジンケート処理液に浸漬して第１回目のジンケート処理を行い、その後、素材を硝酸溶液に浸漬して第２回目の硝酸浸漬処理を行った後にジンケート処理液に浸漬して第２回目のジンケート処理を行い、その後、素材を硝酸溶液に浸漬して第３回目の硝酸浸漬処理を行った後にジンケート処理液に浸漬して第３回目のジンケート処理を行うことを特徴とする。このアルミニウムまたはアルミニウム合金素材のめっき前処理方法において、脱脂処理の後に素材を水洗するとともに、エッチング処理の後に素材を水洗するのが好ましい。 That is, according to the pretreatment method for plating an aluminum or aluminum alloy material according to the present invention, after degreasing and etching the aluminum or aluminum alloy material, the material is immersed in a nitric acid solution and the first nitric acid immersion treatment is performed. After that, the first zincate treatment is performed by immersing in the zincate treatment solution, and then the material is immersed in the nitric acid solution to perform the second nitric acid immersion treatment, and then immersed in the zincate treatment solution for the second time. A zincate treatment is performed, and then the material is immersed in a nitric acid solution to perform a third nitric acid immersion treatment, and then immersed in a zincate treatment solution to perform a third zincate treatment. In the pre-plating method for aluminum or aluminum alloy material, it is preferable that the material is washed with water after the degreasing treatment and the material is washed with water after the etching treatment.
本発明によれば、アルミニウムまたはアルミニウム合金素材にダブルジンケート処理を施した後に、さらに第３回目の硝酸浸漬処理とジンケート処理を施すことにより、ダブルジンケート処理を施した場合と同様にアルミニウムまたはアルミニウム合金素材とめっき皮膜の密着性を良好に維持しながら、ダブルジンケート処理を施した場合と比較して非常に優れた耐食性のめっき皮膜を得ることができる。 According to the present invention, after the double zincate treatment is applied to the aluminum or aluminum alloy material, the third nitric acid immersion treatment and the zincate treatment are further performed, so that the aluminum or aluminum alloy is treated in the same manner as the double zincate treatment. While maintaining good adhesion between the material and the plating film, an extremely corrosion-resistant plating film can be obtained as compared with the case where the double zincate treatment is performed.
本発明によるアルミニウムまたはアルミニウム合金素材のめっき前処理方法の実施の形態では、アルミニウムまたはアルミニウム合金素材に脱脂処理およびエッチング処理を施した後、素材を硝酸溶液に浸漬して第１回目の硝酸浸漬処理を行った後にジンケート処理液に浸漬して第１回目のジンケート処理を行い、その後、素材を硝酸溶液に浸漬して第２回目の硝酸浸漬処理を行った後にジンケート処理液に浸漬して第２回目のジンケート処理を行い、その後、素材を硝酸溶液に浸漬して第３回目の硝酸浸漬処理を行った後にジンケート処理液に浸漬して第３回目のジンケート処理を行う。 In the embodiment of the plating pretreatment method for an aluminum or aluminum alloy material according to the present invention, after degreasing and etching the aluminum or aluminum alloy material, the material is immersed in a nitric acid solution and the first nitric acid immersion treatment is performed. After performing the first zincate treatment by immersing in the zincate treatment solution, and then immersing the material in the nitric acid solution and performing the second nitric acid immersion treatment, and then immersing in the zincate treatment solution, the second A third zincate treatment is performed, and then the material is immersed in a nitric acid solution to perform a third nitric acid immersion treatment and then immersed in a zincate treatment solution to perform a third zincate treatment.
本実施の形態のアルミニウムまたはアルミニウム合金素材のめっき前処理方法では、まず、アルミニウムまたはアルミニウム合金素材に対して、通常の脱脂処理およびエッチング処理を施す。 In the pretreatment method for plating aluminum or aluminum alloy material according to the present embodiment, first, normal degreasing treatment and etching treatment are performed on the aluminum or aluminum alloy material.
次に、従来のジンケート処理と同様に、素材を硝酸溶液に浸漬して第１回目の硝酸浸漬処理を行うことによって素材の表面を活性化した後に、素材をジンケート処理液に浸漬して第１回目のジンケート処理を行うことによって、素材の表面に亜鉛を置換析出させて置換亜鉛皮膜を形成する。 Next, similarly to the conventional zincate treatment, after activating the surface of the material by immersing the material in a nitric acid solution and performing the first nitric acid dipping treatment, the material is dipped in a zincate treatment solution to obtain the first. By performing the second zincate treatment, zinc is substituted and deposited on the surface of the material to form a substituted zinc film.
次に、従来のダブルジンケート処理と同様に、素材を再度硝酸溶液に浸漬して第２回目の硝酸浸漬処理を行うことによって素材の表面の亜鉛皮膜を溶解剥離させた後に、素材を再度ジンケート処理液に浸漬して第２回目のジンケート処理を行うことによって、素材の表面に亜鉛を置換析出させて、第１回目のジンケート処理後の置換亜鉛皮膜よりも緻密で均一な置換亜鉛皮膜を形成する。 Next, in the same way as the conventional double zincate treatment, after the material is again immersed in a nitric acid solution and the second nitric acid immersion treatment is performed, the zinc film on the surface of the material is dissolved and peeled off, and then the material is zincated again. By immersing in the solution and performing the second zincate treatment, zinc is deposited on the surface of the material to form a denser and more uniform substituted zinc coating than the substituted zinc coating after the first zincate treatment. .
次に、素材を再度硝酸溶液に浸漬して第３回目の硝酸浸漬処理を行うことによって素材の正面の亜鉛皮膜を溶解剥離させた後に、素材を再度ジンケート処理液に浸漬して第３回目のジンケート処理を行うことによって、素材の表面に亜鉛を置換析出させて、第２回目のジンケート処理後の置換亜鉛皮膜よりも非常に平滑な置換亜鉛皮膜を形成する。 Next, after immersing the material again in the nitric acid solution and performing a third nitric acid dipping treatment to dissolve and peel the zinc coating on the front surface of the material, the material is again dipped in the zincate treatment solution and the third time. By performing zincate treatment, zinc is substituted and deposited on the surface of the material to form a substituted zinc coating that is much smoother than the substituted zinc coating after the second zincate treatment.
このようなめっき前処理を施した素材に銅またはニッケルストライクめっきを施し、その後、所望のめっきを施すことができる。 Copper or nickel strike plating can be applied to the material subjected to such plating pretreatment, and then desired plating can be performed.
第１回目と第２回目のジンケート処理時間（素材をジンケート処理液に浸漬する時間）については、従来のダブルジンケート処理と同様に、第１回目のジンケート処理時間は１０〜６０秒程度、第２回目のジンケート処理時間は１０〜３０秒程度でよい。また、第３回目のジンケート処理時間は第２回目と同程度の時間でよく、１０〜３０秒程度の処理時間で十分な効果が得られる。なお、これらの処理時間の幅は、素材の種類や表面状態による。 Regarding the first and second zincate treatment times (the time for immersing the material in the zincate treatment solution), the first zincate treatment time is about 10 to 60 seconds, as in the conventional double zincate treatment. The time for the second zincate treatment may be about 10 to 30 seconds. Further, the third zincate treatment time may be the same as the second time, and a sufficient effect can be obtained with a treatment time of about 10 to 30 seconds. Note that the width of these treatment times depends on the type of material and the surface condition.
本実施の形態のアルミニウムまたはアルミニウム合金素材のめっき前処理方法では、第３回目のジンケート処理によって非常に平滑な置換亜鉛皮膜（ジンケート皮膜）を形成することができることがわかった。このように非常に平滑なジンケート皮膜を形成することができるため、従来のダブルジンケート処理を行った後のジンケート皮膜上に析出させるめっき皮膜中のピンホール数と比べて、ジンケート皮膜上に析出させるめっき皮膜中のピンホール数（このピンホールの発生数は下地の状態に大きく影響され、下地が平滑である方がピンホール発生数が少ない）を非常に少なくすることができ、非常に優れた耐食性のめっき皮膜を得ることができる。 In the pretreatment method for plating aluminum or aluminum alloy material according to the present embodiment, it was found that a very smooth substituted zinc film (zincate film) can be formed by the third zincate process. Since a very smooth zincate film can be formed in this way, it is deposited on the zincate film compared to the number of pinholes in the plating film deposited on the zincate film after the conventional double zincate treatment. The number of pinholes in the plating film (the number of pinholes is greatly affected by the condition of the base, and the number of pinholes generated when the base is smooth is very small). A corrosion-resistant plating film can be obtained.
以下、本発明によるアルミニウムのめっき前処理方法の実施例について詳細に説明する。
［実施例１］
Hereinafter, examples of the pretreatment method for plating aluminum according to the present invention will be described in detail.
[Example 1]
まず、炭酸ナトリウム（２５ｇ／Ｌ）と第三リン酸ナトリウム（２５ｇ／Ｌ）と表面活性剤（１ｇ／Ｌ）とからなる組成の脱脂液を６０℃に保持し、この脱脂液にアルミニウム基材（表面粗さＲａ=０．０５μｍで５０ｍｍ×５０ｍｍ×０．０５ｍｍの大きさの東海アルミ箔（株）製のアルミニウム基板）を１５秒間浸漬することにより、アルミニウム基材の表面の脱脂処理を行った後、アルミニウム基材を水洗して脱脂液を洗い流した。次に、ＮａＯＨ（３０ｇ／Ｌ）溶液からなるエッチング液を４０℃に保持し、このエッチング液にアルミニウム基材を３０秒間浸漬してエッチング処理を行った後、アルミニウム基板を水洗してエッチング液を洗い流した。次に、硝酸（５０％）溶液を２５℃に保持し、この硝酸溶液にアルミニウム基材を３０秒間浸漬して、第１回目の硝酸浸漬処理を行った。次に、ジンケート処理液（上村工業製のＡＺ−３０１−３Ｘ）（４００ｍＬ／Ｌ）を２５℃に保持し、このジンケート処理液にアルミニウム基材を１５秒間浸漬して、第１回目のジンケート処理を行った。 First, a degreasing liquid having a composition comprising sodium carbonate (25 g / L), trisodium phosphate (25 g / L) and a surfactant (1 g / L) is maintained at 60 ° C., and an aluminum base material is added to the degreasing liquid. (The surface roughness Ra = 0.05 μm and 50 mm × 50 mm × 0.05 mm aluminum substrate manufactured by Tokai Aluminum Foil Co., Ltd.) is immersed for 15 seconds to degrease the surface of the aluminum base. After that, the aluminum substrate was washed with water to wash away the degreasing solution. Next, an etching solution composed of a NaOH (30 g / L) solution is kept at 40 ° C., an aluminum substrate is immersed in this etching solution for 30 seconds to perform etching, and then the aluminum substrate is washed with water to remove the etching solution. Washed away. Next, the nitric acid (50%) solution was kept at 25 ° C., and the aluminum base material was immersed in the nitric acid solution for 30 seconds to perform the first nitric acid immersion treatment. Next, a zincate treatment solution (AZ-301-3X manufactured by Uemura Kogyo Co., Ltd.) (400 mL / L) is maintained at 25 ° C., and the aluminum base material is immersed in this zincate treatment solution for 15 seconds, so that the first zincate treatment is performed. Went.
次に、第１回目の硝酸浸漬処理と同じ硝酸溶液（２５℃に保持した５０％硝酸溶液）にアルミニウム基材を１０秒間浸漬して、第２回目の硝酸浸漬処理を行った後、第１回目のジンケート処理と同じジンケート処理液（２５℃に保持した上村工業製のＡＺ−３０１−３Ｘ（４００ｍＬ／Ｌ））にアルミニウム基材を１５秒間浸漬して、第２回目のジンケート処理を行った。 Next, the aluminum base material is immersed for 10 seconds in the same nitric acid solution (50% nitric acid solution maintained at 25 ° C.) as in the first nitric acid immersion treatment, and then the second nitric acid immersion treatment is performed. The second zincate treatment was performed by immersing the aluminum substrate in the same zincate treatment solution as the second zincate treatment (AZ-301-3X (400 mL / L) manufactured by Uemura Kogyo, maintained at 25 ° C.) for 15 seconds. .
次に、第１回目の硝酸浸漬処理と同じ硝酸溶液（２５℃に保持した５０％硝酸溶液）にアルミニウム基材を１０秒間浸漬して、第３回目の硝酸浸漬処理を行った後、第１回目のジンケート処理と同じジンケート処理液（２５℃に保持した上村工業製のＡＺ−３０１−３Ｘ（４００ｍＬ／Ｌ））にアルミニウム基材を１５秒間浸漬して、第３回目のジンケート処理を行った。 Next, after the aluminum substrate was immersed for 10 seconds in the same nitric acid solution (50% nitric acid solution maintained at 25 ° C.) as in the first nitric acid immersion treatment, the first nitric acid immersion treatment was performed, and then the first A third zincate treatment was performed by immersing the aluminum substrate in the same zincate treatment solution as the first zincate treatment (AZ-301-3X (400 mL / L) manufactured by Uemura Kogyo, maintained at 25 ° C.) for 15 seconds. .
このようにしてめっき前処理を行ったアルミニウム基材に対して、以下のようにＮｉストライクめっきを施した後、Ｎｉ本めっきを施した。 After the Ni strike plating was performed as described below on the aluminum base material subjected to the plating pretreatment in this manner, Ni main plating was performed.
まず、硫酸ニッケル六水和物（２４０ｇ／Ｌ）と塩化ニッケル（４５ｇ／Ｌ）とホウ酸（３５ｇ／Ｌ）とからなるめっき浴（ワット浴）を５０℃に保持し、このめっき浴中にアルミニウム基材とＮｉ電極板を浸漬し、アルミニウム基材を負極、Ｎｉ電極板を正極に接続し、電流密度を６．０Ａ／ｄｍ２に設定して通電し、アルミニウム基材上に厚さ０．５μｍのＮｉストライク皮膜を成膜した。なお、通常のＮｉストライクめっきでは、めっき浴としてｐＨが低いウッド浴が使用されているが、アルミニウム基材にめっきする場合、ｐＨが低いことによりアルミニウム基材自体が溶解してしまうため、ウッド浴を使用することができない。一方、ワット浴ではｐＨ４程度であるので、アルミニウム基材への影響はない。 First, a plating bath (watt bath) composed of nickel sulfate hexahydrate (240 g / L), nickel chloride (45 g / L) and boric acid (35 g / L) is maintained at 50 ° C., and the plating bath The aluminum substrate and Ni electrode plate are immersed, the aluminum substrate is connected to the negative electrode, the Ni electrode plate is connected to the positive electrode, the current density is set to 6.0 A / dm 2 , and the thickness is 0 on the aluminum substrate. A Ni strike film having a thickness of 5 μm was formed. In general Ni strike plating, a wood bath having a low pH is used as a plating bath. However, when plating on an aluminum substrate, the aluminum substrate itself dissolves due to the low pH, so the wood bath Can not be used. On the other hand, since the pH is about 4 in the Watt bath, there is no influence on the aluminum substrate.
次に、スルファミン酸ニッケル（４５０ｇ／Ｌ）と塩化ニッケル（２０ｇ／Ｌ）とホウ酸（４０ｇ／Ｌ）からなるめっき浴（スルファミン酸無光沢浴、ｐＨ４）を５０℃に保持し、このめっき浴中にＮｉストライクめっきを施したアルミニウム基材とＮｉ電極板を浸漬して、アルミニウム基材を負極、Ｎｉ電極板を正極に接続し、電流密度を６．０Ａ／ｄｍ２に設定して通電し、Ｎｉストライク皮膜上に厚さ１．０μｍのＮｉ皮膜を成膜した。 Next, a plating bath (sulfamic acid matte bath, pH 4) composed of nickel sulfamate (450 g / L), nickel chloride (20 g / L) and boric acid (40 g / L) is maintained at 50 ° C. An aluminum base plate and Ni electrode plate subjected to Ni strike plating are immersed therein, the aluminum base material is connected to the negative electrode, the Ni electrode plate is connected to the positive electrode, and the current density is set to 6.0 A / dm 2 to energize. A Ni film having a thickness of 1.0 μm was formed on the Ni strike film.
このように、めっき前処理を施したアルミニウム基材にＮｉストライクめっきとＮｉ本めっきを順次施してＮｉめっき部材を作製した。 In this manner, Ni strike plating and Ni main plating were sequentially applied to the aluminum base material that had been subjected to the plating pretreatment to produce a Ni plated member.
［実施例２］
Ｎｉ本めっきを施さなかった以外は実施例１と同じ方法によりＮｉめっき部材を作製した。
[Example 2]
A Ni plated member was produced by the same method as in Example 1 except that the Ni main plating was not performed.
［実施例３］
Ｎｉ本めっきによるＮｉ皮膜の厚さを０．５μｍにした以外は実施例１と同じ方法によりＮｉめっき部材を作製した。
[Example 3]
A Ni plated member was produced by the same method as in Example 1 except that the thickness of the Ni film formed by Ni main plating was changed to 0.5 μm.
［実施例４］
アルミニウム基材として表面粗さＲａ＝０．２μｍのアルミニウム基板を使用した以外は実施例１と同じ方法によりＮｉめっき部材を作製した。
[Example 4]
A Ni-plated member was prepared by the same method as in Example 1 except that an aluminum substrate having a surface roughness Ra = 0.2 μm was used as the aluminum base material.
［比較例１〜４］
第３回目の硝酸浸漬処理と第３回目のジンケート処理を行わなかった以外は、それぞれ実施例１〜４と同じ方法によりＮｉめっき部材を作製した。
[Comparative Examples 1-4]
A Ni-plated member was produced in the same manner as in Examples 1 to 4, except that the third nitric acid immersion treatment and the third zincate treatment were not performed.
上記の実施例１〜４および比較例１〜４で作製したＮｉめっき部材のめっきの耐食性を評価するために、ＪＩＳ Ｈ８５０２に準拠した中性塩水噴霧試験（中性の塩化ナトリウム溶液を用いて行う連続噴霧試験）を行った。なお、試験期間を５日間とし、各々の実施例および比較例について１０個のサンプルについて試験を行った。その結果、実施例１〜４では、ピンホール密度がそれぞれ０．０個／ｃｍ２、３８．２個／ｃｍ２、２．５個／ｃｍ２、２．５個／ｃｍ２であったのに対し、比較例１〜４では、ピンホール密度がそれぞれ５．５個／ｃｍ２、１２７．４個／ｃｍ２、１９．１個／ｃｍ２、３８．２個／ｃｍ２であり、それぞれ同じ素材およびめっき構成で比較（実施例１と比較例１、実施例２と比較例２、実施例３と比較例４、実施例４と比較例４を比較）すると、実施例１〜４のピンホール密度が比較例１〜４と比べて非常に低くなっており、実施例１〜４のＮｉめっき部材が比較例１〜４のＮｉめっき部材と比べて非常に耐食性に優れているのがわかった。特に、実施例１では５日経過後も腐食は見られず、比較例１〜４ではピンホールを基点としたと考えられる腐食が見られた。また、実施例４と比較例４のようにアルミニウム基材の表面粗さが粗い場合でも、実施例４のＮｉめっき部材が比較例４のＮｉめっき部材と比べて非常に耐食性に優れているのがわかった。
In order to evaluate the corrosion resistance of the plating of the Ni-plated members prepared in Examples 1 to 4 and Comparative Examples 1 to 4, a neutral salt spray test based on JIS H8502 (performed using a neutral sodium chloride solution) (Continuous spray test). The test period was 5 days, and 10 samples were tested for each example and comparative example. As a result, in Examples 1 to 4, the pinhole densities were 0.0 / cm 2 , 38.2 / cm 2 , 2.5 / cm 2 , and 2.5 / cm 2 , respectively. On the other hand, in Comparative Examples 1 to 4, the pinhole density is 5.5 / cm 2 , 127.4 / cm 2 , 19.1 / cm 2 , 38.2 / cm 2 , respectively. When compared with the same material and plating configuration (Example 1 and Comparative Example 1, Example 2 and Comparative Example 2, Example 3 and Comparative Example 4, Example 4 and Comparative Example 4 are compared), Examples 1 to 4 The pinhole density is very low compared to Comparative Examples 1 to 4, and the Ni plated members of Examples 1 to 4 are very excellent in corrosion resistance compared to the Ni plated members of Comparative Examples 1 to 4. all right. In particular, in Example 1, no corrosion was observed even after the lapse of 5 days, and in Comparative Examples 1 to 4, corrosion considered to be based on pinholes was observed. Further, even when the surface roughness of the aluminum substrate is rough as in Example 4 and Comparative Example 4, the Ni plated member of Example 4 is very excellent in corrosion resistance compared to the Ni plated member of Comparative Example 4. I understood.
Claims (2)
2. The pretreatment method for plating an aluminum or aluminum alloy material according to claim 1, wherein the material is washed with water after the degreasing treatment, and the material is washed with water after the etching treatment.
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| KR100971008B1 (en) * | 2008-05-02 | 2010-07-20 | 성균관대학교산학협력단 | Method for fabricating electric double layer capacitor electrode using eutectic reaction |
| JP2010285652A (en) * | 2009-06-11 | 2010-12-24 | Yokohama Precision Kk | Method and apparatus for plating bus-bar |
| JP2012178196A (en) * | 2011-02-25 | 2012-09-13 | Minebea Co Ltd | Method for manufacturing base plate of disk drive, base plate of disk drive and disk drive |
| CN103946427A (en) * | 2011-09-13 | 2014-07-23 | 加拿大皇家铸币厂 | Zincating aluminum |
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| CN103946427A (en) * | 2011-09-13 | 2014-07-23 | 加拿大皇家铸币厂 | Zincating aluminum |
| JP2014530293A (en) * | 2011-09-13 | 2014-11-17 | モネ ロワイヤル カナディエンヌ／ロイヤル カナディアン ミントＭｏｎｎａｉｅ Ｒｏｙａｌｅ Ｃａｎａｄｉｅｎｎｅ／Ｒｏｙａｌ Ｃａｎａｄｉａｎ Ｍｉｎｔ | Aluminum zincate treatment |
| US9540735B2 (en) | 2011-09-13 | 2017-01-10 | Royal Canadian Mint | Zincating aluminum |
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