JP2015185582A - Method for manufacturing electronic component - Google Patents

Method for manufacturing electronic component Download PDF

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JP2015185582A
JP2015185582A JP2014058394A JP2014058394A JP2015185582A JP 2015185582 A JP2015185582 A JP 2015185582A JP 2014058394 A JP2014058394 A JP 2014058394A JP 2014058394 A JP2014058394 A JP 2014058394A JP 2015185582 A JP2015185582 A JP 2015185582A
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plating
electronic component
aluminum
lead frame
solution
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JP6314574B2 (en
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晴司 宮本
Seiji Miyamoto
晴司 宮本
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Mitsubishi Electric Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing an electronic component, by which a lead frame can be plated without dissolving an aluminum-containing portion.SOLUTION: A method for manufacturing an electronic component comprises: an electrolytic cleaning step for immersing, in an electrolytic solution of pH 7.8 to 8.8, an object to be processed, which has an electronic component with an aluminum-containing portion including aluminum and exposed to the outside and a metal lead frame fixed to the electronic component thereby to electrolytically clean the object to be processed; a plating-pretreatment step for immersing the object to be processed in solution including, as a primary component, an acid mixture solution of sulfate and phosphate or an organic acid; and a plating step for plating the lead frame by immersing the object to be processed in a plating solution including the organic acid as a primary component.

Description

本発明は、電子部品の製造方法に関する。   The present invention relates to a method for manufacturing an electronic component.

特許文献1には、電子部品を溶液に浸漬し、電子部品の樹脂バリを電解除去することが開示されている。   Patent Document 1 discloses that an electronic component is immersed in a solution, and resin burrs of the electronic component are electrolytically removed.

特開平06−053262号公報Japanese Patent Laid-Open No. 06-053262

アルミニウムを含むアルミニウム含有部が外部に露出した電子部品と、リードフレームとが一体となった状態で、リードフレームにめっきを施すことがある。めっきを施す前には、リードフレームの上の汚れ及び樹脂バリ等を除去する電解洗浄工程と、リードフレームの上の酸化金属を除去するめっき前処理工程を実施する。   In some cases, the lead frame is plated in a state in which the electronic component in which the aluminum-containing portion including aluminum is exposed to the outside and the lead frame are integrated. Before plating, an electrolytic cleaning process for removing dirt and resin burrs on the lead frame and a plating pretreatment process for removing metal oxide on the lead frame are performed.

電解洗浄工程で例えば水酸化カリウム又は水酸化ナトリウムなどの強アルカリ性の溶液を使用すると、アルミニウム含有部が溶解(侵食)する問題があった。また、めっき前処理工程で例えばフッ化物又は硫酸などの酸化力の強い酸を高濃度で使用すると、アルミニウム含有部が溶解する問題があった。   When a strong alkaline solution such as potassium hydroxide or sodium hydroxide is used in the electrolytic cleaning step, there is a problem that the aluminum-containing portion is dissolved (eroded). Further, when an acid having a strong oxidizing power such as fluoride or sulfuric acid is used at a high concentration in the plating pretreatment process, there is a problem that the aluminum-containing portion is dissolved.

本発明は、上述のような課題を解決するためになされたもので、アルミニウム含有部を溶解させることなく、リードフレームにめっきできる電子部品の製造方法を提供することを目的とする。   The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a method for manufacturing an electronic component that can be plated on a lead frame without dissolving an aluminum-containing portion.

本願の発明に係る電子部品の製造方法は、アルミニウムを含むアルミニウム含有部が外部に露出した電子部品と、該電子部品に固定され金属で形成されたリードフレームと、を有する被処理物を、pH7.8〜8.8の電解液に浸漬し、該被処理物を電解洗浄する電解洗浄工程と、該被処理物を、硫酸塩と燐酸塩との混酸液を主成分とする液体、又は有機酸を主成分とする液体に浸漬するめっき前処理工程と、該被処理物を、有機酸を主成分とするめっき液に浸漬し、該リードフレームにめっきを形成するめっき工程と、を備えたことを特徴とする。   According to a method of manufacturing an electronic component according to the present invention, an object to be processed having an electronic component in which an aluminum-containing portion containing aluminum is exposed to the outside, and a lead frame fixed to the electronic component and formed of metal, has a pH of 7 Electrolytic cleaning step of immersing in electrolytic solution of 8 to 8.8 and electrolytically cleaning the object to be processed, and liquid to be processed mainly containing a mixed acid solution of sulfate and phosphate, or organic A plating pretreatment step of immersing in a liquid containing an acid as a main component, and a plating step of immersing the workpiece in a plating solution containing an organic acid as a main component to form a plating on the lead frame. It is characterized by that.

本発明によれば、弱アルカリ性の溶液を用いて電解洗浄工程を実施し、弱酸性の溶液を用いてめっき前処理工程とめっき工程を実施するので、アルミニウム含有部を溶解させることなく、リードフレームにめっきできる。   According to the present invention, since the electrolytic cleaning process is performed using a weakly alkaline solution and the plating pretreatment process and the plating process are performed using a weakly acidic solution, the lead frame can be obtained without dissolving the aluminum-containing portion. Can be plated on.

被処理物の平面図である。It is a top view of a to-be-processed object. アルミニウム含有部とリード部の拡大図である。It is an enlarged view of an aluminum containing part and a lead part. 電解洗浄工程を説明する図である。It is a figure explaining an electrolytic cleaning process. 電解洗浄工程後のアルミニウム含有部とリード部の拡大図である。It is an enlarged view of the aluminum containing part and lead part after an electrolytic cleaning process. めっき前処理工程を説明する図である。It is a figure explaining a plating pretreatment process. めっき前処理工程後のアルミニウム含有部とリード部の拡大図である。It is an enlarged view of the aluminum containing part and lead part after a plating pretreatment process. めっき工程を説明する図である。It is a figure explaining a plating process. めっき工程後のアルミニウム含有部とリード部の拡大図である。It is an enlarged view of the aluminum containing part and lead part after a plating process.

実施の形態.
本発明の実施の形態に係る電子部品の製造方法について図面を参照して説明する。同じ又は対応する構成要素には同じ符号を付し、説明の繰り返しを省略する場合がある。
Embodiment.
A method for manufacturing an electronic component according to an embodiment of the present invention will be described with reference to the drawings. The same or corresponding components are denoted by the same reference numerals, and repeated description may be omitted.

図1は、被処理物10の平面図である。被処理物10は電子部品12を備えている。電子部品12はアルミニウムを含むアルミニウム含有部14を備えている。アルミニウム含有部14はアルミニウム又はアルミニウム合金で形成されている。電子部品12は半導体素子を覆うモールド樹脂16を備えている。アルミニウム含有部14はモールド樹脂16から外部に露出している。   FIG. 1 is a plan view of the workpiece 10. The workpiece 10 includes an electronic component 12. The electronic component 12 includes an aluminum containing portion 14 containing aluminum. The aluminum containing part 14 is made of aluminum or an aluminum alloy. The electronic component 12 includes a mold resin 16 that covers the semiconductor element. The aluminum containing part 14 is exposed to the outside from the mold resin 16.

電子部品12には、銅で形成されたリードフレーム20が固定されている。リードフレーム20は、電子部品12に固定されたリード部22と、リード部22に接続された外枠24を備えている。リード部22は、例えば半導体素子のゲート端子、エミッタ端子、及びコレクタ端子として機能する。前述のアルミニウム含有部14は、例えば半導体素子の放熱板として機能する。   A lead frame 20 made of copper is fixed to the electronic component 12. The lead frame 20 includes a lead portion 22 fixed to the electronic component 12 and an outer frame 24 connected to the lead portion 22. The lead part 22 functions as a gate terminal, an emitter terminal, and a collector terminal of a semiconductor element, for example. The aluminum-containing part 14 described above functions as a heat sink for a semiconductor element, for example.

図2は、アルミニウム含有部14とリード部22の拡大図である。図2Aには、アルミニウム含有部14の表面の不導体膜30が示されている。図2Bには、リード部22の表面のCu酸化膜32、汚れ34、及び樹脂バリ36が示されている。樹脂バリ36は、モールド樹脂16の形成時にリード部22に付着したものである。   FIG. 2 is an enlarged view of the aluminum-containing portion 14 and the lead portion 22. FIG. 2A shows the nonconductive film 30 on the surface of the aluminum-containing portion 14. FIG. 2B shows a Cu oxide film 32, a dirt 34, and a resin burr 36 on the surface of the lead portion 22. The resin burr 36 is attached to the lead portion 22 when the mold resin 16 is formed.

続いて、リード部22に対し電気めっきでめっきを形成するための処理について説明する。まず、電解洗浄工程を実施する。図3は、電解洗浄工程を説明する図である。容器50の中には、pH7.8〜8.8の電解液52がある。この電解液52は、例えばホウ素及びホウ素の化合物を主成分とする液体であるが、pH7.8〜8.8の範囲であれば他の液体でもよい。   Then, the process for forming plating with respect to the lead part 22 by electroplating is demonstrated. First, an electrolytic cleaning process is performed. FIG. 3 is a diagram for explaining the electrolytic cleaning process. In the container 50, there is an electrolytic solution 52 having a pH of 7.8 to 8.8. The electrolytic solution 52 is, for example, a liquid mainly composed of boron and a compound of boron, but may be another liquid as long as the pH is in the range of 7.8 to 8.8.

電解洗浄工程では陰極電解法を用いる。具体的には、電解液52に浸漬した被処理物10のリードフレーム20にマイナス電極54を接触させ、電解液52にプラス電極56を浸漬する。この状態で、マイナス電極54とプラス電極56の間に電流を流すことで、被処理物10を電解洗浄する。   Cathodic electrolysis is used in the electrolytic cleaning process. Specifically, the negative electrode 54 is brought into contact with the lead frame 20 of the workpiece 10 immersed in the electrolytic solution 52, and the positive electrode 56 is immersed in the electrolytic solution 52. In this state, by passing a current between the minus electrode 54 and the plus electrode 56, the workpiece 10 is electrolytically cleaned.

図4は、電解洗浄工程後のアルミニウム含有部14とリード部22の拡大図である。図4Aには、pHが7.8〜8.8の弱アルカリ性の電解液52で電解洗浄を行ったことで、不導体膜30が残ったことが示されている。図4Bには、電解洗浄によりリード部22の上の汚れ34と樹脂バリ36が除去されたことが示されている。なお、電解洗浄工程における電解液として、pH8以下のアルカリ溶液を用いて、確実にアルミニウム含有部14の溶解を防止することが好ましい。   FIG. 4 is an enlarged view of the aluminum-containing portion 14 and the lead portion 22 after the electrolytic cleaning process. FIG. 4A shows that the non-conductive film 30 remains as a result of performing electrolytic cleaning with a weak alkaline electrolytic solution 52 having a pH of 7.8 to 8.8. FIG. 4B shows that the dirt 34 and the resin burr 36 on the lead portion 22 have been removed by electrolytic cleaning. In addition, it is preferable to use an alkaline solution having a pH of 8 or lower as the electrolytic solution in the electrolytic cleaning step to reliably prevent the aluminum-containing portion 14 from dissolving.

次いで、めっき前処理工程に処理を進める。図5は、めっき前処理工程を説明する図である。容器100の中には、硫酸塩と燐酸塩との混酸液を主成分とする液体102がある。液体102に被処理物10を浸漬させる。   Next, the process proceeds to a plating pretreatment process. FIG. 5 is a diagram illustrating a plating pretreatment process. In the container 100, there is a liquid 102 mainly composed of a mixed acid solution of sulfate and phosphate. The workpiece 10 is immersed in the liquid 102.

図6は、めっき前処理工程後のアルミニウム含有部14とリード部22の拡大図である。図6Aには、弱酸性の液体102でめっき前処理を行ったことで、不導体膜30が残ったことが示されている。図6Bには、めっき前処理によりリード部22の上のCu酸化膜32(酸化銅)が除去されたことが示されている。なお、フリードフレームにCu変質層が形成されていた場合、当該Cu変質層は、このめっき前処理工程にて除去される。   FIG. 6 is an enlarged view of the aluminum-containing portion 14 and the lead portion 22 after the plating pretreatment process. FIG. 6A shows that the nonconductive film 30 remains after the plating pretreatment with the weakly acidic liquid 102. FIG. 6B shows that the Cu oxide film 32 (copper oxide) on the lead portion 22 has been removed by the plating pretreatment. In addition, when the Cu altered layer is formed in the freed frame, the Cu altered layer is removed in the plating pretreatment process.

次いで、めっき工程に処理を進める。図7は、めっき工程を説明する図である。容器110には有機酸を主成分とするめっき液112がある。有機酸は例えばアルカノールスルホン酸であるが特にこれに限定されない。めっき液112に浸漬した被処理物10のリードフレーム20にマイナス電極114を接触させ、めっき液112にプラス電極116を浸漬する。この状態で、マイナス電極114とプラス電極116の間に電流を流すことで、リードフレーム20にめっきを形成する。   Next, the process proceeds to the plating step. FIG. 7 is a diagram illustrating a plating process. The container 110 has a plating solution 112 mainly composed of an organic acid. The organic acid is, for example, alkanol sulfonic acid, but is not particularly limited thereto. The minus electrode 114 is brought into contact with the lead frame 20 of the workpiece 10 immersed in the plating solution 112, and the plus electrode 116 is immersed in the plating solution 112. In this state, plating is formed on the lead frame 20 by passing a current between the negative electrode 114 and the positive electrode 116.

図8は、めっき工程後のアルミニウム含有部14とリード部22の拡大図である。図8Aには、酸化力の弱い弱酸性のめっき液112でめっき工程を行ったことで、不導体膜30が残ったことが示されている。図8Bには、リード部22にめっき150が形成されたことが示されている。めっき150は例えばSnである。なお、上述の各工程の前後に水洗工程を設けても良い。   FIG. 8 is an enlarged view of the aluminum-containing portion 14 and the lead portion 22 after the plating step. FIG. 8A shows that the non-conductive film 30 remains as a result of performing the plating process with the weakly acidic plating solution 112 having a weak oxidizing power. FIG. 8B shows that the plating 150 is formed on the lead portion 22. The plating 150 is, for example, Sn. In addition, you may provide the water washing process before and after each above-mentioned process.

電解洗浄工程ではpH7.8〜8.8の弱アルカリ性の電解液を用いるので、不導体膜30を残すことができる。よって、電解洗浄工程でのアルミニウム含有部14の溶解を防止できる。めっき前処理工程では混酸液を主成分とする弱酸性の溶液を用いるので不導体膜30を残すことができる。よって、めっき前処理工程でのアルミニウム含有部14の溶解を防止できる。めっき工程では有機酸を主成分とする弱酸性のめっき液を用いるので不導体膜30を残すことができる。よって、めっき工程でのアルミニウム含有部14の溶解を防止できる。従って、アルミニウム含有部14を溶解させることなく、リードフレーム20にめっきできる。   In the electrolytic cleaning process, a weak alkaline electrolytic solution having a pH of 7.8 to 8.8 is used, so that the nonconductive film 30 can be left. Therefore, dissolution of the aluminum-containing portion 14 in the electrolytic cleaning process can be prevented. In the plating pretreatment step, a weakly acidic solution containing a mixed acid solution as a main component is used, so that the nonconductive film 30 can be left. Therefore, dissolution of the aluminum-containing portion 14 in the plating pretreatment process can be prevented. Since a weakly acidic plating solution containing an organic acid as a main component is used in the plating step, the nonconductive film 30 can be left. Therefore, dissolution of the aluminum-containing portion 14 in the plating process can be prevented. Therefore, the lead frame 20 can be plated without dissolving the aluminum-containing portion 14.

このように、本発明の実施の形態に係る電子部品の製造方法は、弱アルカリ性(又は弱酸性)の溶液を使用することで、電解洗浄工程、めっき前処理工程、及びめっき工程において、アルミニウム含有部14の上に不導体膜30が存在し続ける。本発明の実施の形態に係る電子部品の製造方法は、この特徴を失わない範囲で様々な変形が可能である。   As described above, the method of manufacturing an electronic component according to the embodiment of the present invention uses a weakly alkaline (or weakly acidic) solution, so that the electrolytic cleaning process, the plating pretreatment process, and the plating process contain aluminum. The nonconductive film 30 continues to exist on the portion 14. The electronic component manufacturing method according to the embodiment of the present invention can be variously modified within a range not losing this characteristic.

例えば、めっき前処理工程で用いる液体102は、有機酸(例えばアルカノールスルホン酸)を主成分とする液体でもよい。また、リードフレームの形状は特に限定されない。例えば外枠はなくてもよい。リードフレーム20は金属で形成されていればよく、銅を材料とするものに限定されない。金属でリードフレームを形成した場合、リードフレームの上に存在する酸化金属がメッキ前処理工程で除去される。   For example, the liquid 102 used in the plating pretreatment process may be a liquid containing an organic acid (for example, alkanol sulfonic acid) as a main component. Further, the shape of the lead frame is not particularly limited. For example, there may be no outer frame. The lead frame 20 only needs to be formed of metal, and is not limited to one made of copper. When the lead frame is formed of metal, the metal oxide existing on the lead frame is removed in the plating pretreatment process.

10 被処理物、 12 電子部品、 14 アルミニウム含有部、 16 モールド樹脂、 20 リードフレーム、 22 リード部、 24 外枠、 30 不導体膜、 32 Cu酸化膜、 34 汚れ、 36 樹脂バリ、 52 電解液、 102 液体、 112 めっき液   10 Workpieces, 12 Electronic parts, 14 Aluminum containing part, 16 Mold resin, 20 Lead frame, 22 Lead part, 24 Outer frame, 30 Nonconductive film, 32 Cu oxide film, 34 Dirt, 36 Resin burr, 52 Electrolyte , 102 liquid, 112 plating solution

Claims (3)

アルミニウムを含むアルミニウム含有部が外部に露出した電子部品と、前記電子部品に固定され金属で形成されたリードフレームと、を有する被処理物を、pH7.8〜8.8の電解液に浸漬し、前記被処理物を電解洗浄する電解洗浄工程と、
前記被処理物を、硫酸塩と燐酸塩との混酸液を主成分とする液体、又は有機酸を主成分とする液体に浸漬するめっき前処理工程と、
前記被処理物を、有機酸を主成分とするめっき液に浸漬し、前記リードフレームにめっきを形成するめっき工程と、を備えたことを特徴とする電子部品の製造方法。
An object to be processed having an electronic component having an aluminum-containing portion including aluminum exposed to the outside and a lead frame fixed to the electronic component and formed of metal is immersed in an electrolyte solution having a pH of 7.8 to 8.8. An electrolytic cleaning process for electrolytically cleaning the object to be processed;
A plating pretreatment step of immersing the object to be processed in a liquid mainly composed of a mixed acid solution of sulfate and phosphate, or a liquid mainly composed of an organic acid;
A method of manufacturing an electronic component comprising: a plating step of immersing the object to be processed in a plating solution containing an organic acid as a main component to form plating on the lead frame.
前記電解液はホウ素及びホウ素の化合物を主成分とし、
前記めっき前処理工程で用いる前記有機酸、又は前記めっき工程で用いる前記有機酸は、アルカノールスルホン酸であることを特徴とする請求項1に記載の電子部品の製造方法。
The electrolytic solution is mainly composed of boron and a compound of boron,
2. The method of manufacturing an electronic component according to claim 1, wherein the organic acid used in the plating pretreatment step or the organic acid used in the plating step is an alkanol sulfonic acid.
前記電子部品はモールド樹脂を備え、
前記電解洗浄工程、前記めっき前処理工程、及び前記めっき工程において、前記アルミニウム含有部の上に不導体膜が存在し続け、
前記電解洗浄工程では、前記リードフレームの上の汚れ及び樹脂バリが除去され、
前記めっき前処理工程では、前記リードフレームの上の酸化金属が除去されることを特徴とする請求項1又は2に記載の電子部品の製造方法。
The electronic component includes a mold resin,
In the electrolytic cleaning step, the plating pretreatment step, and the plating step, a nonconductive film continues to exist on the aluminum-containing portion,
In the electrolytic cleaning step, dirt and resin burrs on the lead frame are removed,
3. The method of manufacturing an electronic component according to claim 1, wherein the metal oxide on the lead frame is removed in the plating pretreatment step. 4.
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