JPH0971871A - Electroless gold plating liquid - Google Patents

Electroless gold plating liquid

Info

Publication number
JPH0971871A
JPH0971871A JP25465295A JP25465295A JPH0971871A JP H0971871 A JPH0971871 A JP H0971871A JP 25465295 A JP25465295 A JP 25465295A JP 25465295 A JP25465295 A JP 25465295A JP H0971871 A JPH0971871 A JP H0971871A
Authority
JP
Japan
Prior art keywords
gold
gold plating
mol
electroless
salt
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
Application number
JP25465295A
Other languages
Japanese (ja)
Inventor
Hidehiro Nakao
英弘 中尾
Satoshi Kawashima
敏 川島
Tadashi Sasaki
忠 佐々木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MERUTETSUKUSU KK
Original Assignee
MERUTETSUKUSU KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MERUTETSUKUSU KK filed Critical MERUTETSUKUSU KK
Priority to JP25465295A priority Critical patent/JPH0971871A/en
Publication of JPH0971871A publication Critical patent/JPH0971871A/en
Pending legal-status Critical Current

Links

Landscapes

  • Chemically Coating (AREA)

Abstract

PROBLEM TO BE SOLVED: To form a high-quality gold plating film at a high film forming rate by using an electroless gold plating liquid containing water-soluble gold salt without cyanogen, complexing agent and reducing agent and using a thiocyanate and sulfite as the complexing agent. SOLUTION: An electroless gold plating liquid containing a water-soluble gold salt without cyanogen, complexing agent and reducing agent is used, and thiocyanate and sulfite are used for the complexing agent. It is preferable to add thiocyanate by >=0.05mol/l and sulfite by 0.05-0.2mol/l. It is preferable that the plating liquid contains 0.005-0.015mol/l water-soluble gold salt and 0.01mol/l reducing agent. As for the reducing agent, ascorbic acid or its salt is used. As for the water-soluble gold salt, gold chloride, gold chloride acid, gold sulfite, gold thiocyanate or its salt can be used, and its concn. is controlled to about 0.0005-0.15mol/l. The obtd. plating liquid has low toxicity and excellent stability.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は無電解金めっき液に
係り、特に毒性が低く安定性に優れた無電解金めっき液
に関する。
TECHNICAL FIELD The present invention relates to an electroless gold plating solution, and more particularly to an electroless gold plating solution having low toxicity and excellent stability.

【0002】[0002]

【従来の技術】近年、電子部品の小型化と高性能化に伴
って配線の微細化、実装技術の改良、プリント配線板材
料の多様化が見られる。そして、例えば、電子機器のプ
リント配線板の回路と半導体のチップを接続するための
ボンディング用接点、電気的に独立した微細部分等に金
めっきを施す場合、通電するためのリードが必要な電気
金めっきに代わって、複雑な形状面にも均一な析出が可
能な無電解金めっきが用いられるようになっている。
2. Description of the Related Art In recent years, miniaturization of wiring, improvement of mounting technology, and diversification of printed wiring board materials have been observed along with miniaturization and high performance of electronic parts. Then, for example, when gold plating is applied to a bonding contact for connecting a circuit of a printed wiring board of an electronic device and a semiconductor chip, or an electrically independent fine portion, etc., an electric gold that requires a lead for energization Instead of plating, electroless gold plating has been used, which enables even deposition on a complex surface.

【0003】従来の無電解金めっき液は、金イオンの錯
化剤としてシアン化合物を含み、ジメチルアミンボラン
(DMAB)等のホウ化物を還元剤として含有するもの
であった(特公昭50−3743号等)。しかし、この
無電解金めっき液は、シアン化合物を含有するため毒性
が非常に高く、作業上、環境保全上の問題があった。ま
た、還元剤の安定性やめっき速度の向上のために、上記
の無電解金めっき液は高アルカリとする必要があった。
このため、アルカリ溶液中で不安定な窒化アルミニウム
等の被めっき材料が侵食されたり、被めっき材料に通常
のポジ型フォトレジストのようにアルカリ性で不安定な
物質が存在する場合には、剥離が生じる等の問題があっ
た。
The conventional electroless gold plating solution contains a cyanide compound as a complexing agent for gold ions and a boride such as dimethylamine borane (DMAB) as a reducing agent (Japanese Patent Publication No. 50-3743). Etc.). However, since this electroless gold plating solution contains a cyanide compound, it is extremely toxic and has problems in working and environmental protection. Further, in order to improve the stability of the reducing agent and the plating rate, the electroless gold plating solution needs to be highly alkaline.
For this reason, if the material to be plated, such as aluminum nitride, which is unstable in an alkaline solution, is eroded, or if the material to be plated contains an alkaline and unstable substance such as a normal positive photoresist, peeling may occur. There were problems such as occurrence.

【0004】[0004]

【発明が解決しようとする課題】このため、シアン化合
物を含有しない無電解金めっき液(ノーシアン浴)の要
望が高まり、塩化金、塩化金酸またはチオ硫酸金を金塩
とし、錯化剤にチオシアン酸塩を用いた無電解金めっき
液(特開昭62−174384号)や、錯化剤として亜
硫酸塩とチオ硫酸塩を用いた無電解金めっき液(特開平
6−145996号)等が使用されている。
Therefore, there is an increasing demand for an electroless gold plating solution (a cyanide bath) that does not contain a cyanide compound, and gold chloride, chloroauric acid or gold thiosulfate is used as a gold salt and used as a complexing agent. An electroless gold plating solution using thiocyanate (JP-A-62-174384), an electroless gold plating solution using sulfite and a thiosulfate as a complexing agent (JP-A-6-145996), and the like are available. in use.

【0005】しかしながら、上記の無電解金めっき液
は、いずれも浴安定性が悪く、安定剤を添加しても数十
時間しかめっき浴を連続稼働させることができないとい
う問題がある。
However, all of the above electroless gold plating solutions have poor bath stability, and there is a problem that the plating bath can be continuously operated for only several tens of hours even if a stabilizer is added.

【0006】本発明は上述のような事情に鑑みてなされ
たものであり、高品質の金めっき膜を高い成膜速度で形
成することができ、かつ、毒性が低く安定性に優れた無
電解金めっき液を提供することを目的とする。
The present invention has been made in view of the above circumstances, and it is possible to form a high-quality gold plating film at a high film-forming rate, and to have low toxicity and excellent stability in an electroless method. The purpose is to provide a gold plating solution.

【0007】[0007]

【課題を解決するための手段】このような目的を達成す
るために、本発明はシアンを含有しない水溶性金塩、錯
化剤および還元剤を少なくとも含有し、前記錯化剤はチ
オシアン酸塩および亜硫酸塩であるような構成とした。
In order to achieve such an object, the present invention contains at least a water-soluble cyanide-free gold salt, a complexing agent and a reducing agent, and the complexing agent is thiocyanate. And sulfite salt.

【0008】また、前記チオシアン酸塩を0.05mo
l/l以上含有し、前記亜硫酸塩を0.05〜0.2m
ol/lの範囲で含有するような構成、前記水溶性金塩
を0.005〜0.015mol/lの範囲で含有する
ような構成、前記還元剤を0.01mol/l以上含有
するような構成、あるいは、前記還元剤はアスコルビン
酸またはその塩であるような構成とした。
The thiocyanate is added in an amount of 0.05
1 / l or more, and the sulfite is 0.05 to 0.2 m
such that the water-soluble gold salt is contained in the range of 0.005 to 0.015 mol / l, and the reducing agent is contained in an amount of 0.01 mol / l or more. Alternatively, the reducing agent is ascorbic acid or a salt thereof.

【0009】[0009]

【発明の実施の形態】本発明の無電解金めっき液を構成
する水溶性金塩は、塩化金、塩化金酸、亜硫酸金、チオ
シアン酸金およびこれらの塩を使用することができる。
無電解金めっき液中の水溶性金塩の濃度は0.005〜
0.015mol/l程度とすることができる。水溶性
金塩の濃度が0.005mol/l未満では析出速度が
不十分であり、また、0.015mol/lを超えると
浴安定性が損なわれることになる。
BEST MODE FOR CARRYING OUT THE INVENTION As the water-soluble gold salt constituting the electroless gold plating solution of the present invention, gold chloride, chloroauric acid, gold sulfite, gold thiocyanate and salts thereof can be used.
The concentration of water-soluble gold salt in the electroless gold plating solution is 0.005
It can be about 0.015 mol / l. If the concentration of the water-soluble gold salt is less than 0.005 mol / l, the deposition rate will be insufficient, and if it exceeds 0.015 mol / l, the bath stability will be impaired.

【0010】また、本発明の無電解金めっき液を構成す
る錯化剤は、チオシアン酸塩および亜硫酸塩である。本
発明は、錯化剤としてチオシアン酸塩と亜硫酸塩を組み
合わせることにより、従来のチオ硫酸塩や亜硫酸塩、そ
れらの組み合わせからなる錯化剤を使用した場合に比べ
て、安定剤を添加しないベース浴の安定性が著しく向上
することに着目してなされたものである。
Further, the complexing agent constituting the electroless gold plating solution of the present invention is thiocyanate and sulfite. The present invention is based on the combination of a thiocyanate and a sulfite as a complexing agent, compared to the case of using a conventional thiosulfate or sulfite, or a complexing agent consisting of a combination thereof, without adding a stabilizer. This was done paying attention to the fact that the stability of the bath is remarkably improved.

【0011】無電解金めっき液中のチオシアン酸塩の濃
度は0.05mol/l以上、好ましくは0.05〜
0.2mol/l程度とすることができる。チオシアン
酸塩の濃度が0.05mol/l未満では金の析出速度
が不十分である。また、無電解めっき液中の亜硫酸塩の
濃度は0.05〜0.2mol/l程度とすることがで
きる。亜硫酸塩の濃度が0.05mol/l未満では浴
安定性が損なわれ、0.2mol/lを超えると金の析
出速度が不十分なものとなり好ましくない。
The concentration of thiocyanate in the electroless gold plating solution is 0.05 mol / l or more, preferably 0.05 to
It can be about 0.2 mol / l. When the thiocyanate concentration is less than 0.05 mol / l, the gold deposition rate is insufficient. The concentration of sulfite in the electroless plating solution can be about 0.05 to 0.2 mol / l. If the concentration of the sulfite is less than 0.05 mol / l, the bath stability will be impaired, and if it exceeds 0.2 mol / l, the gold deposition rate will be insufficient, which is not preferable.

【0012】本発明の無電解金めっき液を構成する還元
剤としては、アスコルビン酸またはその塩;水素化ホウ
素化合物、ジメチルアミンボラン、ジエチルアミンボラ
ン、トリエチルアミンボラン等のボロン系化合物;ヒド
ラジンとその塩、メチルヒドラジンとその誘導体、エチ
ルヒドラジンとその誘導体等のヒドラジン化合物;チオ
尿素、N−メチルチオ尿素、N,N’−ジメチルチオ尿
素等のチオ尿素とその塩;ヒドロキノン、カテコール、
ピロガロール等のフェノール化合物とその誘導体;o−
フェニレンジアミン、p−フェニレンジアミン等の芳香
族アミン化合物とその誘導体等の還元剤を使用すること
ができる。無電解金めっき液中の還元剤の濃度は0.0
1mol/l以上、好ましくは0.05〜0.2mol
/l程度とすることができる。還元剤の濃度が0.01
mol/l未満の場合、金の析出速度が不十分なものと
なり好ましくない。
As the reducing agent constituting the electroless gold plating solution of the present invention, ascorbic acid or a salt thereof; a boron-based compound such as a borohydride compound, dimethylamine borane, diethylamine borane, triethylamine borane; hydrazine and a salt thereof, Hydrazine compounds such as methylhydrazine and its derivatives, ethylhydrazine and its derivatives; thiourea and its salts such as thiourea, N-methylthiourea and N, N'-dimethylthiourea; hydroquinone, catechol,
Phenol compounds such as pyrogallol and its derivatives; o-
An aromatic amine compound such as phenylenediamine or p-phenylenediamine and a reducing agent such as a derivative thereof can be used. The concentration of the reducing agent in the electroless gold plating solution is 0.0
1 mol / l or more, preferably 0.05 to 0.2 mol
/ L can be set. The concentration of reducing agent is 0.01
When it is less than mol / l, the gold deposition rate becomes insufficient, which is not preferable.

【0013】さらに、本発明の無電解金めっき液には、
Pb、Bi、Tl等の重金属水溶塩(添加濃度:1〜1
00mg/l)、2−メルカプトベンゾチアゾール、2
−メルカプトベンズイミダゾール等の含硫黄有機化合物
(添加濃度:1〜100mg/l)、ベンゾトリアゾー
ル等の含窒素有機化合物(添加濃度:1〜100mg/
l)、モノエタノールアミン、ジエタノールアミン、ト
リエタノールアミン等のアミノアルコール化合物とその
誘導体(添加濃度:1〜100ml/l)、ニトリロ三
酢酸、エチレンジアミン四酢酸等のイミノカルボン酸
(添加濃度:1〜100g/l)、ポリエチレングリコ
ール、ポリプロピレングリコール等の非イオン界面活性
剤(添加濃度:0.1〜100mg/l)等を添加する
ことができる。
Further, the electroless gold plating solution of the present invention contains
Heavy metal water salt such as Pb, Bi, Tl (addition concentration: 1-1
00 mg / l), 2-mercaptobenzothiazole, 2
-Sulfur-containing organic compounds such as mercaptobenzimidazole (addition concentration: 1 to 100 mg / l), nitrogen-containing organic compounds such as benzotriazole (addition concentration: 1 to 100 mg / l)
l), aminoalcohol compounds such as monoethanolamine, diethanolamine and triethanolamine and their derivatives (addition concentration: 1 to 100 ml / l), iminocarboxylic acids such as nitrilotriacetic acid and ethylenediaminetetraacetic acid (addition concentration: 1 to 100 g) / L), nonionic surfactants such as polyethylene glycol and polypropylene glycol (concentration of addition: 0.1 to 100 mg / l) and the like can be added.

【0014】本発明の無電解金めっき液を用いた無電解
金めっきは、例えば、浴温度40〜70℃、浴pH4〜
10の条件で行うことができる。浴温度が40℃未満で
は金の析出速度が不十分であり、また、70℃を超える
と浴安定性が損なわれ、成膜された金めっき膜の外観が
悪化してしまう。また、浴pHが上記の範囲をはずれる
と、浴安定性が損なわれ、成膜された金めっき膜の外観
が悪化してしまう。
The electroless gold plating using the electroless gold plating solution of the present invention is carried out, for example, at a bath temperature of 40 to 70 ° C. and a bath pH of 4 to 4.
It can be performed under 10 conditions. If the bath temperature is lower than 40 ° C, the gold deposition rate is insufficient, and if it exceeds 70 ° C, the bath stability is impaired and the appearance of the formed gold plating film is deteriorated. When the bath pH is out of the above range, the bath stability is impaired and the appearance of the formed gold plating film is deteriorated.

【0015】[0015]

【実施例】次に、本発明の実施例を示して本発明を更に
詳細に説明する。実施例1 水溶性金塩の濃度を下記の表1に示されるように変化さ
せた下記の組成の無電解金めっき液(試料1〜3、比較
試料1〜2)を調製した。
EXAMPLES Next, the present invention will be described in more detail by showing examples of the present invention. Example 1 Electroless gold plating solutions (Samples 1 to 3 and Comparative Samples 1 and 2) having the following compositions in which the concentration of the water-soluble gold salt was changed as shown in Table 1 below were prepared.

【0016】 (無電解金めっき液の組成) ・水溶性金塩(塩化金酸) … 表1に示される濃度 ・チオシアン酸カリウム(KSCN) … 0.1mol/l ・亜硫酸ナトリウム(Na2 SO3 ) … 0.1mol/l ・アスコルビン酸 … 0.1mol/l 次に、無電解ニッケル−置換金めっき(厚み0.05μ
m)を施した真ちゅう板を被めっき材料とし、上記の無
電解金めっき液を用いて無電解めっきにより金めっき膜
の形成を行った。めっき条件は下記のとおりとした。
(Composition of Electroless Gold Plating Solution) Water-Soluble Gold Salt (Chloroauric Acid) Concentration shown in Table 1 Potassium thiocyanate (KSCN) 0.1 mol / l Sodium sulfite (Na 2 SO 3 ) 0.1 mol / l Ascorbic acid 0.1 mol / l Next, electroless nickel-substitution gold plating (thickness 0.05 μm
A brass plate subjected to m) was used as a material to be plated, and a gold plating film was formed by electroless plating using the above electroless gold plating solution. The plating conditions were as follows.

【0017】(めっき条件) ・浴温度 : 60℃ ・pH : 6.0 ・めっき時間: 30分 上述のような無電解金めっきにおける金の析出速度、浴
安定性および形成した金めっき膜の外観の評価結果を下
記の表1に示した。
(Plating conditions) -Bath temperature: 60 ° C-pH: 6.0-Plating time: 30 minutes Gold deposition rate, bath stability and appearance of the formed gold plating film in electroless gold plating as described above. The evaluation results of are shown in Table 1 below.

【0018】[0018]

【表1】 表1に示されるように、水溶性金塩の濃度が0.005
〜0.015mol/lの範囲内にある場合(試料1〜
3)、金の析出速度が高く、浴安定性が良好で金めっき
膜の外観は光沢金色(一部無光沢金色)を呈するもので
あった。しかし、水溶性金塩の濃度が0.005mol
/l未満の場合(比較試料1)には、析出速度が実用レ
ベル(0.3μm/時)に達せず、また、水溶性金塩の
濃度が0.015mol/lを超える場合(比較試料
2)、めっき浴が加温分解を生じた。実施例2 還元剤であるアスコルビン酸の濃度を下記の表2に示さ
れるように変化させた下記の組成の無電解金めっき液
(試料4〜11、比較試料3)を調製した。
[Table 1] As shown in Table 1, the water-soluble gold salt concentration was 0.005.
~ 0.015 mol / l range (Sample 1
3) The deposition rate of gold was high, the bath stability was good, and the appearance of the gold-plated film was a glossy gold color (partly a dull gold color). However, the concentration of water-soluble gold salt is 0.005 mol
In the case of less than 1 / l (Comparative sample 1), the deposition rate does not reach the practical level (0.3 μm / hour) and the concentration of the water-soluble gold salt exceeds 0.015 mol / l (Comparative sample 2). ), The plating bath caused thermal decomposition. Example 2 An electroless gold plating solution (Samples 4 to 11, Comparative Sample 3) having the following composition was prepared in which the concentration of ascorbic acid as a reducing agent was changed as shown in Table 2 below.

【0019】 (無電解金めっき液の組成) ・水溶性金塩(塩化金酸) … 0.01mol/l ・チオシアン酸カリウム(KSCN) … 0.1mol/l ・亜硫酸ナトリウム(Na2 SO3 ) … 0.1mol/l ・アスコルビン酸 … 表2に示される濃度 次に、実施例1と同様の条件により、上記の無電解金め
っき液を用いて無電解めっきにより金めっき膜の形成を
行い、金の析出速度、浴安定性および形成した金めっき
膜の外観の評価結果を下記の表2に示した。
(Composition of Electroless Gold Plating Solution) Water-Soluble Gold Salt (Chloroauric Acid) 0.01 mol / l Potassium Thiocyanate (KSCN) 0.1 mol / l Sodium Sulfite (Na 2 SO 3 ) 0.1 mol / l Ascorbic acid Concentration shown in Table 2 Next, a gold plating film was formed by electroless plating using the above electroless gold plating solution under the same conditions as in Example 1. The evaluation results of the gold deposition rate, bath stability, and appearance of the formed gold plating film are shown in Table 2 below.

【0020】[0020]

【表2】 表2に示されるように、還元剤であるアスコルビン酸の
濃度が0.01mol/l以上である場合(試料4〜1
1)、金の析出速度が高く、浴安定性が良好で金めっき
膜の外観は光沢金色を呈するものであった。しかし、ア
スコルビン酸の濃度が0.01mol/l未満の場合
(比較試料3)には、金の析出速度が実用レベル(0.
3μm/時)に達しないものであった。実施例3 錯化剤である亜硫酸ナトリウムの濃度を下記の表3に示
されるように変化させた下記の組成の無電解金めっき液
(試料12〜14、比較試料4〜5)を調製した。
[Table 2] As shown in Table 2, when the concentration of ascorbic acid as a reducing agent is 0.01 mol / l or more (Samples 4 to 1).
1) The gold deposition rate was high, the bath stability was good, and the appearance of the gold-plated film was a glossy gold color. However, when the ascorbic acid concentration was less than 0.01 mol / l (Comparative Sample 3), the gold deposition rate was at a practical level (0.
3 μm / hour). Example 3 Electroless gold plating solutions (Samples 12 to 14 and Comparative Samples 4 to 5) having the following compositions were prepared in which the concentration of sodium sulfite as a complexing agent was changed as shown in Table 3 below.

【0021】 (無電解金めっき液の組成) ・水溶性金塩(塩化金酸) … 0.01mol/l ・チオシアン酸カリウム(KSCN) … 0.1mol/l ・亜硫酸ナトリウム(Na2 SO3 ) … 表3に示される濃度 ・アスコルビン酸 … 0.1mol/l 次に、実施例1と同様の条件により、上記の無電解金め
っき液を用いて無電解めっきにより金めっき膜の形成を
行い、金の析出速度、浴安定性および形成した金めっき
膜の外観の評価結果を下記の表3に示した。
(Composition of Electroless Gold Plating Solution) Water-Soluble Gold Salt (Chloroauric Acid) 0.01 mol / l Potassium Thiocyanate (KSCN) 0.1 mol / l Sodium Sulfite (Na 2 SO 3 ) ... Concentrations shown in Table 3 Ascorbic acid 0.1 mol / l Next, under the same conditions as in Example 1, a gold plating film was formed by electroless plating using the above electroless gold plating solution. Table 3 below shows the evaluation results of the gold deposition rate, bath stability, and appearance of the formed gold plating film.

【0022】[0022]

【表3】 表3に示されるように、錯化剤である亜硫酸ナトリウム
の濃度が0.05〜0.2mol/lの範囲内にある場
合(試料12〜14)、金の析出速度が高く、浴安定性
が良好で金めっき膜の外観は光沢(一部無光沢)金色を
呈するものであった。しかし、亜硫酸ナトリウムの濃度
が0.05mol/l未満の場合(比較試料4)にはめ
っき浴の分解が生じ、また、亜硫酸ナトリウムの濃度が
0.2mol/lを超える場合(比較試料5)、金の析
出速度が実用レベル(0.3μm/時)に達しないもの
であった。実施例4 錯化剤であるチオシアン酸カリウムの濃度を下記の表4
に示されるように変化させた下記の組成の無電解金めっ
き液(試料15〜19、比較試料6)を調製した。
[Table 3] As shown in Table 3, when the concentration of the complexing agent sodium sulfite is in the range of 0.05 to 0.2 mol / l (Samples 12 to 14), the gold deposition rate is high and the bath stability is high. And the appearance of the gold-plated film was a glossy (partly matte) gold color. However, when the concentration of sodium sulfite is less than 0.05 mol / l (Comparative sample 4), decomposition of the plating bath occurs, and when the concentration of sodium sulfite exceeds 0.2 mol / l (Comparative sample 5), The gold deposition rate did not reach the practical level (0.3 μm / hour). Example 4 The concentration of potassium thiocyanate as a complexing agent is shown in Table 4 below.
The electroless gold plating solutions (Samples 15 to 19 and Comparative Sample 6) having the following compositions changed as shown in (4) were prepared.

【0023】 (無電解金めっき液の組成) ・水溶性金塩(塩化金酸) … 0.01mol/l ・チオシアン酸カリウム(KSCN) … 表4に示される濃度 ・亜硫酸ナトリウム(Na2 SO3 ) … 0.1mol/l ・アスコルビン酸 … 0.1mol/l 次に、実施例1と同様の条件により、上記の無電解金め
っき液を用いて無電解めっきにより金めっき膜の形成を
行い、金の析出速度、浴安定性および形成した金めっき
膜の外観の評価結果を下記の表4に示した。
(Composition of electroless gold plating solution) -Water-soluble gold salt (chloroauric acid) -0.01 mol / l-Potassium thiocyanate (KSCN) -Concentration shown in Table 4-Sodium sulfite (Na 2 SO 3 ) 0.1 mol / l Ascorbic acid 0.1 mol / l Next, under the same conditions as in Example 1, a gold plating film was formed by electroless plating using the above electroless gold plating solution. Table 4 below shows the evaluation results of the gold deposition rate, bath stability, and appearance of the formed gold plating film.

【0024】[0024]

【表4】 表4に示されるように、錯化剤であるチオシアン酸カリ
ウムの濃度が0.05以上である場合(試料15〜1
9)、金の析出速度が高く、浴安定性が良好で金めっき
膜の外観は光沢金色を呈するものであった。しかし、チ
オシアン酸カリウムの濃度が0.05mol/l未満の
場合(比較試料6)には、金の析出速度が実用レベル
(0.3μm/時)に達しないものであった。実施例5 下記の組成の無電解金めっき液(上記の試料2,7,1
3,16に相当)を調製した。
[Table 4] As shown in Table 4, when the concentration of the complexing agent potassium thiocyanate is 0.05 or more (Samples 15 to 1)
9), the deposition rate of gold was high, the bath stability was good, and the appearance of the gold-plated film was glossy gold. However, when the concentration of potassium thiocyanate was less than 0.05 mol / l (Comparative Sample 6), the gold deposition rate did not reach the practical level (0.3 μm / hour). Example 5 An electroless gold plating solution having the following composition (samples 2, 7, 1 above)
Corresponding to 3,16) was prepared.

【0025】 (無電解金めっき液の組成) ・水溶性金塩(塩化金酸) … 0.01mol/l ・チオシアン酸カリウム(KSCN) … 0.1mol/l ・亜硫酸ナトリウム(Na2 SO3 ) … 0.1mol/l ・アスコルビン酸 … 0.1mol/l 次に、無電解ニッケル−置換金めっき(厚み0.05μ
m)を施した真ちゅう板を被めっき材料とし、上記の無
電解金めっき液を用いて無電解めっきにより金めっき膜
の形成を行った。めっき条件は、浴温度を30〜80
℃、pHを3.0〜11.0の範囲で変化させ、めっき
時間は30分とした。そして、各めっき条件における金
の析出速度、浴安定性および形成した金めっき膜の外観
の評価結果をそれぞれ下記の表5〜表7に示した。
(Composition of Electroless Gold Plating Solution) Water-Soluble Gold Salt (Chloroauric Acid) 0.01 mol / l Potassium Thiocyanate (KSCN) 0.1 mol / l Sodium Sulfite (Na 2 SO 3 ) 0.1 mol / l Ascorbic acid 0.1 mol / l Next, electroless nickel-substitution gold plating (thickness 0.05 μm
A brass plate subjected to m) was used as a material to be plated, and a gold plating film was formed by electroless plating using the above electroless gold plating solution. The plating condition is a bath temperature of 30-80.
The temperature and pH were changed in the range of 3.0 to 11.0, and the plating time was 30 minutes. Tables 5 to 7 below show the results of evaluation of the gold deposition rate, bath stability, and appearance of the formed gold plating film under each plating condition.

【0026】[0026]

【表5】 [Table 5]

【0027】[0027]

【表6】 [Table 6]

【0028】[0028]

【表7】 表5〜表7に示されるように、浴温度40〜70℃、p
H4.0〜10.0の範囲において金の析出速度が高
く、浴安定性が良好で金めっき膜の外観は光沢金色乃至
暗金色を呈するものであった。比較例 下記の組成の無電解金めっき液(比較試料7〜8)を調
製した。
[Table 7] As shown in Table 5 to Table 7, bath temperature 40 to 70 ° C., p
In the range of H4.0 to 10.0, the deposition rate of gold was high, the bath stability was good, and the appearance of the gold plating film was glossy gold to dark gold. Comparative Example Electroless gold plating solutions (Comparative Samples 7 to 8) having the following compositions were prepared.

【0029】 (無電解金めっき液(比較試料7)の組成) ・水溶性金塩(塩化金酸) … 0.01mol/l ・チオシアン酸カリウム(KSCN) … 0.1mol/l ・チオ硫酸ナトリウム(Na223 ) … 0.1mol/l ・アスコルビン酸 … 0.1mol/l (無電解金めっき液(比較試料8)の組成) ・水溶性金塩(塩化金酸) … 0.01mol/l ・チオ硫酸ナトリウム(Na223 ) … 0.1mol/l ・亜硫酸ナトリウム(Na2 SO3 ) … 0.1mol/l ・アスコルビン酸 … 0.1mol/l 次に、実施例1と同様の条件により、上記の無電解金め
っき液を用いて無電解めっきにより金めっき膜の形成を
行い、金の析出速度、浴安定性および形成した金めっき
膜の外観の評価結果を下記の表8に示した。
(Composition of Electroless Gold Plating Solution (Comparative Sample 7)) Water-Soluble Gold Salt (Chloroauric Acid) 0.01 mol / l Potassium Thiocyanate (KSCN) 0.1 mol / l Sodium Thiosulfate (Na 2 S 2 O 3 ) 0.1 mol / l Ascorbic acid 0.1 mol / l (Composition of electroless gold plating solution (Comparative Sample 8)) Water-soluble gold salt (chloroauric acid) 01 mol / l Sodium thiosulfate (Na 2 S 2 O 3 ) 0.1 mol / l Sodium sulfite (Na 2 SO 3 ) 0.1 mol / l Ascorbic acid 0.1 mol / l Next, Examples A gold plating film was formed by electroless plating using the above electroless gold plating solution under the same conditions as in 1, and the gold deposition rate, bath stability, and the appearance evaluation result of the formed gold plating film are shown below. Shown in Table 8 It was.

【0030】[0030]

【表8】 表8に示されるように、比較試料7の無電解めっき液は
水溶性金塩が溶解せず、また、比較試料8の無電解めっ
き液は加温により分解を生じ、浴安定性に欠けるもので
あった。
[Table 8] As shown in Table 8, the electroless plating solution of Comparative Sample 7 did not dissolve the water-soluble gold salt, and the electroless plating solution of Comparative Sample 8 was decomposed by heating and lacked bath stability. Met.

【0031】[0031]

【発明の作用および効果】以上詳述したように、本発明
によれば水溶性金塩、錯化剤および還元剤を少なくとも
含有し、水溶性金塩はシアンを含有せず、かつ、錯化剤
はチオシアン酸塩と亜硫酸塩の組み合わせであるため、
無電解金めっき液は毒性が極めて低いものであり、ま
た、上記の錯化剤を使用したことにより、従来のノーシ
アン無電解金めっき液に比べて、安定剤を添加しないベ
ース浴の安定性が著しく向上し、さらに、高品質の金め
っき膜を高い成膜速度で形成することが可能である。
As described in detail above, according to the present invention, at least a water-soluble gold salt, a complexing agent and a reducing agent are contained, the water-soluble gold salt does not contain cyanide, and a complexing agent is formed. Since the agent is a combination of thiocyanate and sulfite,
The electroless gold plating solution has extremely low toxicity, and by using the above complexing agent, the stability of the base bath without adding a stabilizer is higher than that of the conventional non-cyan electroless gold plating solution. It is remarkably improved, and it is possible to form a high quality gold plating film at a high film forming rate.

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 シアンを含有しない水溶性金塩、錯化剤
および還元剤を少なくとも含有し、前記錯化剤はチオシ
アン酸塩および亜硫酸塩であることを特徴とする無電解
金めっき液。
1. An electroless gold plating solution comprising at least a water-soluble gold salt containing no cyanide, a complexing agent and a reducing agent, wherein the complexing agent is thiocyanate and sulfite.
【請求項2】 前記チオシアン酸塩を0.05mol/
l以上含有し、前記亜硫酸塩を0.05〜0.2mol
/lの範囲で含有することを特徴とする請求項1に記載
の無電解金めっき液。
2. The thiocyanate is contained in an amount of 0.05 mol /
1 or more and contains the sulfite in an amount of 0.05 to 0.2 mol.
The electroless gold plating solution according to claim 1, wherein the electroless gold plating solution is contained in a range of 1 / l.
【請求項3】 前記水溶性金塩を0.005〜0.01
5mol/lの範囲で含有することを特徴とする請求項
1または請求項2に記載の無電解金めっき液。
3. The water-soluble gold salt is added in an amount of 0.005 to 0.01.
The electroless gold plating solution according to claim 1 or 2, which is contained in a range of 5 mol / l.
【請求項4】 前記還元剤を0.01mol/l以上含
有することを特徴とする請求項1乃至請求項3のいずれ
かに記載の無電解金めっき液。
4. The electroless gold plating solution according to claim 1, which contains 0.01 mol / l or more of the reducing agent.
【請求項5】 前記還元剤は、アスコルビン酸またはそ
の塩であることを特徴とする請求項1乃至請求項4のい
ずれかに記載の無電解金めっき液。
5. The electroless gold plating solution according to any one of claims 1 to 4, wherein the reducing agent is ascorbic acid or a salt thereof.
JP25465295A 1995-09-06 1995-09-06 Electroless gold plating liquid Pending JPH0971871A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25465295A JPH0971871A (en) 1995-09-06 1995-09-06 Electroless gold plating liquid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25465295A JPH0971871A (en) 1995-09-06 1995-09-06 Electroless gold plating liquid

Publications (1)

Publication Number Publication Date
JPH0971871A true JPH0971871A (en) 1997-03-18

Family

ID=17267993

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25465295A Pending JPH0971871A (en) 1995-09-06 1995-09-06 Electroless gold plating liquid

Country Status (1)

Country Link
JP (1) JPH0971871A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002022909A1 (en) * 2000-09-18 2002-03-21 Hitachi Chemical Co., Ltd. Electroless gold plating solution and method for electroless gold plating
JP2005146410A (en) * 2003-10-22 2005-06-09 Kanto Chem Co Inc Electroless gold plating liquid
JP2005256140A (en) * 2004-03-15 2005-09-22 C Uyemura & Co Ltd Gold plating bath
JP2007308796A (en) * 2006-04-18 2007-11-29 Hitachi Chem Co Ltd Electroless gold plating liquid and electroless gold plating method
WO2014072969A1 (en) * 2012-11-09 2014-05-15 Ben Gurion University Of The Negev Research And Development Authority Gold nanostructures and processes for their preparation

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002022909A1 (en) * 2000-09-18 2002-03-21 Hitachi Chemical Co., Ltd. Electroless gold plating solution and method for electroless gold plating
US6811828B2 (en) 2000-09-18 2004-11-02 Hitachi Chemical Co., Ltd. Electroless gold plating solution and method for electroless plating
JP2009235577A (en) * 2000-09-18 2009-10-15 Hitachi Chem Co Ltd Electroless gold plating liquid and method of electroless gold plating
JP2005146410A (en) * 2003-10-22 2005-06-09 Kanto Chem Co Inc Electroless gold plating liquid
JP4603320B2 (en) * 2003-10-22 2010-12-22 関東化学株式会社 Electroless gold plating solution
JP2005256140A (en) * 2004-03-15 2005-09-22 C Uyemura & Co Ltd Gold plating bath
JP2007308796A (en) * 2006-04-18 2007-11-29 Hitachi Chem Co Ltd Electroless gold plating liquid and electroless gold plating method
WO2014072969A1 (en) * 2012-11-09 2014-05-15 Ben Gurion University Of The Negev Research And Development Authority Gold nanostructures and processes for their preparation
US10895013B2 (en) 2012-11-09 2021-01-19 Ben Gurion University Of The Negev Research And Development Authority Gold nanostructures and processes for their preparation

Similar Documents

Publication Publication Date Title
US5364460A (en) Electroless gold plating bath
CN101319318B (en) Electroless gold plating bath, electroless gold plating method and electronic parts
US5803957A (en) Electroless gold plating bath
US6991675B2 (en) Electroless displacement gold plating solution and additive for use in preparing plating solution
JPH0681161A (en) Surface treating agent for copper and copper alloy
KR100529984B1 (en) Electroless Gold Plating Solution and Method For Electroless Gold Plating
JP2927142B2 (en) Electroless gold plating bath and electroless gold plating method
JPH0971871A (en) Electroless gold plating liquid
CA2076088C (en) Method for enhancing the uniform electroless deposition of gold onto a palladium substrate
JP2002180259A (en) Metal deposition acceleration compound in plating liquid and plating liquid containing the same
JP2004143589A (en) Plating method
JP2874088B2 (en) Electroless gold plating bath
JPS609116B2 (en) Electrodeposition method for palladium and palladium alloys
JP3677617B2 (en) Electroless gold plating solution
KR20090069231A (en) Electroless gold plating bath for copper substrate and gold plating using the same
JP3148428B2 (en) Electroless gold plating solution
JP3565302B2 (en) Electroless gold plating method
JP4129363B2 (en) Electrolytic gold plating solution and gold plating method
JP4000101B2 (en) Electroless gold plating solution
EP0661388B1 (en) Chemical etchant for palladium
JP3058178B2 (en) Electroless plating solution
JP3148427B2 (en) Electroless gold plating solution
JP3152008B2 (en) Electroless gold plating solution
JP2003147542A (en) Electroless substitution type gold plating solution
JP3178135B2 (en) Replacement gold plating solution