EP1285104A1 - Elektrolyt und verfahren zur abscheidung von zinn-silber-legierungsschichten - Google Patents
Elektrolyt und verfahren zur abscheidung von zinn-silber-legierungsschichtenInfo
- Publication number
- EP1285104A1 EP1285104A1 EP01936389A EP01936389A EP1285104A1 EP 1285104 A1 EP1285104 A1 EP 1285104A1 EP 01936389 A EP01936389 A EP 01936389A EP 01936389 A EP01936389 A EP 01936389A EP 1285104 A1 EP1285104 A1 EP 1285104A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- silver
- tin
- electrolyte
- salts
- electrolyte according
- 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.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
- C25D3/60—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of tin
Definitions
- the present invention relates to an acidic electrolyte for the deposition of tin-silver alloys, a method which uses this electrolyte, coatings obtainable by the method and the use of the electrolyte for coating electronic components.
- soldering using the eutectic solder alloy SnPb (63% by weight Sn 37% by weight Pb) is the standard method of connection technology.
- the lead tin layers can have any alloy composition, and the pure metals can also be used. Alloys with 3 to 40% by weight of Pb, in particular 5 to 20% by weight of Pb, are used most frequently. High lead alloys with e.g. 95% by weight of Pb is used for special applications when higher melting temperatures are desired. Pure tin coatings are also widespread, although there are fundamental problems here due to the risk of whisker formation that cannot be ruled out.
- lead tin alloys mentioned have very good properties in soft soldering, there is a very great effort to substitute lead. If equipment with leaded solder joints is scrapped and deposited, there is a risk that lead can be converted into water-soluble form by corrosion processes. This can lead to a corresponding contamination of the groundwater in the long term.
- a promising alternative for the eutectic lead tin solder is the tin-silver alloy. Again, the eutectic composition is expediently used, since this reduces the
- the eutectic composition of the tin-silver alloy consists of 96.5% by weight of Sn and 3.5% by weight of Ag.
- the melting point of the eutectic is 221 ° C.
- the melting point can be lowered further to 217 ° C.
- the tin-silver solder SnAg3, 5 also offers itself as an alternative to the lead tin solder, because the former is already used as a solder for special applications and therefore practical experience is already available. If the tin-silver solder is used, it is again desirable that the components are galvanically coated with coatings of a tin-silver alloy in order to maintain the solderability. Since the main component of the solder is tin, a component coating with pure tin would also be compatible with the solder alloy. Pure tin layers are less desirable because of the already mentioned risk of whisker formation.
- the silver content of the tin-silver alloy should advantageously be ⁇ 10% by weight in order to enable the coating to be soldered at low temperatures, ie close to the eutectic of the tin-silver alloy.
- the use of cyanide should be avoided due to its high toxicity.
- alkaline electrolytes have the following disadvantages. Plants that were previously used for the deposition of tin-lead alloys from acidic electrolytes are not designed for the treatment of cyanide electrolytes. However, the further use of these conventional systems for the deposition of tin-lead alloys is also desirable for the deposition of tin-silver alloys for economic reasons.
- the deposition rate from alkaline electrolytes is comparatively slow. Since tin is present in tetravalent form in an alkaline medium, the deposition rate is reduced by 50% compared to an acid electrolyte containing Sn (II).
- the metal with the more positive standard potential is preferred deposited. That is, silver is preferably deposited from a tin-silver electrolyte.
- tin is a reducing agent in a divalent form.
- the reaction can be recognized by the precipitation of finely divided black silver powder or the deposition of a silver mirror on the container wall.
- Another problem is that in general the base materials to be coated have a more negative standard potential than silver.
- the base material for electronic components is often copper or a copper alloy.
- the value for the standard potential Cu - »Cu 2+ is + 0.35 V.
- the difference to silver is thus 0.45 V. This difference in potential causes silver to be deposited on the copper surface during charge exchange. Such a reaction can impair the adhesive strength of the subsequently deposited layers.
- a prerequisite for the successful deposition of tin-silver alloys from a strongly acidic, divalent tin ion-containing electrolyte is therefore to find suitable compounds which complex the silver and thereby shift the standard potential of the silver to more negative values.
- the complexing agents must act selectively on silver.
- Complexing tin would also shift the standard potential to more negative values. This would restore the original potential difference of the uncomplexed ions.
- a disadvantage of the use of potassium iodide is that it has to be used in a large excess in relation to the amount of silver which is too complex. Concentrations of e.g. 300 g / 1 necessary. Since potassium iodide is an expensive compound, such a process could not be operated economically. In addition, a pH value of 4 to 6 must be set. In this range, divalent tin is only soluble in the presence of complexing agents. These, in turn, cause a shift in the standard potential of tin and thus increase the potential difference between tin and silver. Effective complexing agents for tin are e.g. Hydroxy carboxylic acids. These complicate the precipitation of heavy metal compounds in wastewater treatment and are therefore undesirable.
- weakly acidic electrolytes have only a low electrical conductivity.
- Such electrolytes can only be used for the deposition of metal layers at low cathodic current densities (0.1 to 5 A / dm 2 ), ie in the so-called drum and rack technology with deposition rates of usually 0.05 to 2.5 ⁇ m / min. They are not for high cathodic current densities (5 to 100 A / dm 2 ), which are present in high-speed deposition (continuous plating process), with which deposition rates of 2.5 to 50 ⁇ m / min are achieved suitable.
- the method according to EP 0 893 514 is therefore associated with a large number of disadvantages.
- EP 0 854 206 describes aromatic thiol compounds as complexing agents. With such connections, a shift in the resting potential of silver by approximately -400 mV can be achieved. The values are therefore sufficient to achieve a combined deposition of tin and silver and to obtain a stable electrolyte.
- aromatic thiol compounds are easily oxidized to disulfide, sufficient stability of the electrolytes containing these aromatic thiol compounds as complexing agents cannot be achieved in the long term, i.e. permanent operation of the electrolyte is not feasible.
- Aromatic compounds also frequently have poor biodegradability and can therefore lead to problems in biological wastewater treatment.
- thiourea or compounds derived therefrom are mentioned as complexing agents for silver. A sufficient shift in the resting potential is also achieved with these connections.
- a disadvantage of thiourea and its Derivatives are a health hazard that cannot be ruled out. Some of these compounds are particularly toxic to aquatic organisms.
- Aqueous electrolyte for the deposition of tin-silver alloys which contains one or more alkyl or alkanol sulfonic acids, one or more soluble tin (II) salts, one or more soluble silver (I) salts and one or comprises a plurality of organic sulfur compounds, the organic sulfur compounds containing one or more thioether functions and / or ether functions of the general formula -RZ-R 'as a structural feature, where R and R' are identical or different non-aromatic organic radicals and Z is a sulfur atom or an oxygen atom, provided that at least one of the radicals R and R 'contains at least one sulfur atom if Z is exclusively an oxygen atom.
- the organic sulfur compounds preferably have the following general formula:
- Z is exclusively an oxygen atom
- at least one of the radicals X, Y, R 1 , R 2 and R 3 contains at least one sulfur atom.
- alkylene groups are alkylene groups with 1 to 10, preferably 1 to 5 carbon atoms, for example methylene, ethylene, n-propylene, iso-propylene, n-butylene, iso-butylene and tert-butylene groups.
- substituents of the alkylene groups are -OH, -SH, -SR 4 , where R 4 is an alkyl group having 1 to 10 carbon atoms, for example a methyl, ethyl, n-propyl or iso-propyl group, -OR 4 , -NH 2 , NHR 4 and NR 2 (where the two substituents R 4 may be the same or different).
- the sulfur-containing radicals X and / or Y can be an SH group and / or the sulfur-containing radicals R 1 , R 2 and / or R 3 can represent, for example, an alkylene radical which is substituted with an SH group or with an SR 4 group.
- R 1 , R 2 and R 3 are preferably, independently of one another, an alkylene group which has at least two carbon atoms, and in the event that only one Z represents a sulfur atom, X and / or Y is an SH group and in the event that Z is exclusively an oxygen atom, X and Y represent an SH group.
- the following organic sulfur compounds are also preferred:
- 3,6-dithiaoctanediol-1,8 HO-CH 2 -CH 2 -S-CH 2 -CH 2 -S-CH 2 -CH 2 -OH
- 3,6 -dioxaoctanediol -1,8 HS-CH 2 -CH 2 -0-CH 2 -CH 2 -0-CH 2 -CH 2 -SH
- 3,6-dithia-1,8-dimethyloctanediol-1,8 HO-CH (CH 3 ) -CH 2 -S-CH 2 -CH 2 -S-CH 2 -CH (CH 3 ) -OH
- the molar ratio of the organic sulfur compound to the soluble silver (I) salt is preferably at least 1, particularly preferably 5: 1 to 1: 1, particularly preferably 3: 1.
- the tin (II) can be present in the electrolyte as a salt of mineral, alkyl sulfonic or alkanol sulfonic acids.
- salts of the mineral acids are sulfates and tetrafluoroborates.
- Preferred salts of the alkyl sulfonic acids are, for example, methanesulfonates, ethanesulfonates, n- and iso-propanesulfonates, methane disulfonates, ethane disulfonates, 2,3-propane disulfonates and 1,3-propane disulfonates.
- usable Alkanol sulfonates are 2-hydroxyethanesulfonates, 2-hydroxypropanesulfonates and 3-hydroxypropanesulfonates. Tin (II) methanesulfonate is particularly preferred.
- the tin (II) salts are present in the electrolyte preferably in an amount of 5 to 200 g / 1 electrolyte, particularly preferably 10 to 100 g / 1 electrolyte, calculated as tin (II).
- the silver (I) is preferably present in the electrolyte in the form of the salts of mineral, alkyl sulfonic or alkanol sulfonic acids.
- mineral, alkyl sulfone or alkanol sulfonic acid salts correspond to the compounds mentioned above for the tin (II) salts.
- Silver (I) methanesulfonate is particularly preferred.
- the electrolyte preferably contains 0.05 to 50 g / 1, particularly preferably 0.1 to 20 g / 1, of silver (I) salts, calculated as silver (I).
- the soluble silver salts can be generated during the preparation of the electrolyte by adding silver compounds which dissolve in the acidic area with the formation of salts.
- silver compounds which dissolve in the acidic range with salt formation are silver oxide (Ag 2 0) or silver carbonate (Ag 2 C0 3 ).
- the electrolyte can also contain various additives commonly used in acidic electrolytes for the deposition of tin alloys, e.g. grain-refining additives, wetting agents and / or brighteners.
- various additives commonly used in acidic electrolytes for the deposition of tin alloys e.g. grain-refining additives, wetting agents and / or brighteners.
- the grain refining additive is preferably present in an amount of 0.1 to 50 g / 1 electrolyte, preferably 1 to 10 g / 1 electrolyte.
- the wetting agent can be present in an amount of 0.1 to 50 g / 1 electrolyte, preferably 0.5 to 10 g / 1 electrolyte.
- the alkyl sulfonic acid and the alkanol sulfonic acid preferably have 1 to 10, particularly preferably 1 to 5, carbon atoms.
- alkyl sulfonic acids e.g. Methanesulfonic acid, ethanesulfonic acid, n-propanesulfonic acid, iso-propanesulfonic acid, methanedisulfonic acid, ethanedisulfonic acid, 2, 3-propanedisulfonic acid or 1,3-propanedisulfonic acid are present.
- Alkanolsulfonic acids are e.g. 2-hydroxyethanesulfonic acid, 2-hydroxypropanesulfonic acid and 3-hydroxypropanesulfonic acid.
- the alkyl and / or alkanol sulfonic acid is preferably present in the electrolyte in a concentration of 50 to 300 g / 1 electrolyte, particularly preferably 100-200 g / 1 electrolyte.
- the pH of the acidic electrolyte is preferably 0 to ⁇ 1.
- the present invention furthermore provides a process for the electrolytic coating of substrates with tin-silver alloys, in which the coating is applied by passing direct current through the use of the electrolyte according to the invention, an anode made of metallic tin and a cathode from the substrate to be coated, and coatings available through this process.
- the tin-silver alloys applied with the method according to the invention can contain silver in a proportion of 0.1 to 99.9% by weight. In order to enable the alloys to be soldered at low temperatures, they preferably have a silver content of 0.5 to 10% by weight, particularly preferably 2 to 5% by weight. The silver content can be adjusted, for example, by varying the concentration ratios of the tin and silver salts in the electrolyte, the electrolyte temperature and the flow rate of the electrolyte, based on the material to be coated.
- the current density can be 0.1 A / dm 2 (drum or rack technology) to 100 A / dm 2 (high-speed systems).
- the temperature of the electrolyte is preferably in the range from 0 to 70 ° C., particularly preferably in the range from 20 to 50 ° C.
- substrate to be coated e.g. Copper surfaces or surfaces of copper-containing alloys are present.
- the electrolyte according to the invention can be used for the coating of electronic components.
- a tin-silver electrolyte was set up as follows:
- the deposition of the tin-silver coating from this electrolyte on a copper sheet was carried out at 40 + 2 ° C. in a high-speed system in the current density range from 5 to 20 A / dm 2 .
- the electrolyte was stirred intensively (magnetic stirrer, 40 mm stirring rod, stirring speed 700 rpm). Light gray, silk matt deposits were achieved.
- the determination of the alloy composition by means of X-ray fluorescence measurement gave the following values:
- tin-silver electrolyte was made up 150 g / 1 70% aqueous methanesulfonic acid 20 g / 1 tin (II), as tin methanesulfonate 0.5 g / 1 silver (I), as silver methanesulfonate 2 g / 1 3, 6-dithiaoctanediol-1.8 4 g / 1 Nonylphenol ethoxylate with 14 EO groups (Lutensol AP-14 from BASF)
- Example 2 The deposition was carried out as indicated in Example 1. A uniform light gray-smooth deposit was obtained. The silver content at 2 A / dm 2 was 2% by weight.
- the solution was stirred in an open beaker at a temperature between 20 and 25 ° C with a stirring frequency of 300 rpm.
- the shift in the resting potential of the silver by the organic sulfur compound was measured using a silver / silver chloride electrode immediately after the solution was prepared, after one day, after 3 days and after 6 days. The results are shown in Table 1.
- Example 4 The experiment carried out in Example 4 was repeated, except that the 3,6-dithiaoctanediol-1,8 was replaced by the aromatic sulfur compound 2-mercaptoaniline (2.5 g / l). The test results are shown in Table 2.
- the test results show that the proportion of the complexed silver in the solution decreases sharply with the progress of the test.
- the resting potential value of the uncomplexed silver is almost reached after 6 days.
- the decrease in the resting potential shift is due to the oxidation of the 2-mercaptoaniline to 2, 2 '-dithioaniline, which has no complexing effect.
- a stable electrolyte cannot therefore be obtained when the aromatic sulfur compounds which are unstable to oxidation are used.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating And Plating Baths Therefor (AREA)
- Lead Frames For Integrated Circuits (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10026680 | 2000-05-30 | ||
DE10026680A DE10026680C1 (de) | 2000-05-30 | 2000-05-30 | Elektrolyt und Verfahren zur Abscheidung von Zinn-Silber-Legierungsschichten und Verwendung des Elektrolyten |
PCT/EP2001/005901 WO2001092606A1 (de) | 2000-05-30 | 2001-05-22 | Elektrolyt und verfahren zur abscheidung von zinn-silber-legierungsschichten |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1285104A1 true EP1285104A1 (de) | 2003-02-26 |
EP1285104B1 EP1285104B1 (de) | 2003-11-19 |
Family
ID=7644028
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01936389A Expired - Lifetime EP1285104B1 (de) | 2000-05-30 | 2001-05-22 | Elektrolyt und verfahren zur abscheidung von zinn-silber-legierungsschichten |
Country Status (7)
Country | Link |
---|---|
US (1) | US6998036B2 (de) |
EP (1) | EP1285104B1 (de) |
JP (1) | JP4446040B2 (de) |
CN (1) | CN1190523C (de) |
AU (1) | AU2001262313A1 (de) |
DE (2) | DE10026680C1 (de) |
WO (1) | WO2001092606A1 (de) |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6805786B2 (en) * | 2002-09-24 | 2004-10-19 | Northrop Grumman Corporation | Precious alloyed metal solder plating process |
JP4434669B2 (ja) | 2003-09-11 | 2010-03-17 | Necエレクトロニクス株式会社 | 電子部品 |
US7713859B2 (en) * | 2005-08-15 | 2010-05-11 | Enthone Inc. | Tin-silver solder bumping in electronics manufacture |
EP1918426A1 (de) | 2006-10-09 | 2008-05-07 | Enthone, Inc. | Cyanidfreie Elektrolytzusammensetzung und Verfahren zur Abscheidung von Silber- oder Silberlegierungsschichten auf Substraten |
US20100047605A1 (en) * | 2006-12-19 | 2010-02-25 | Christiane Knoblauch | Sliding bearing |
WO2009140524A2 (en) * | 2008-05-15 | 2009-11-19 | Interplex Industries, Inc. | Tin-silver compound coating on printed circuit boards |
EP2221396A1 (de) * | 2008-12-31 | 2010-08-25 | Rohm and Haas Electronic Materials LLC | Bleifreie Elektroplattierungszusammensetzungen aus Blechlegierung und Verfahren |
JP5313773B2 (ja) * | 2009-06-04 | 2013-10-09 | 三菱伸銅株式会社 | めっき付き銅条材及びその製造方法 |
US8440065B1 (en) | 2009-06-07 | 2013-05-14 | Technic, Inc. | Electrolyte composition, method, and improved apparatus for high speed tin-silver electroplating |
US9175400B2 (en) * | 2009-10-28 | 2015-11-03 | Enthone Inc. | Immersion tin silver plating in electronics manufacture |
EP2588644B1 (de) | 2010-06-30 | 2014-06-18 | Schauenburg Ruhrkunststoff GmbH | Tribologisch belastbare edelmetall/metallschichten |
JP5854727B2 (ja) | 2010-09-21 | 2016-02-09 | ローム アンド ハース エレクトロニック マテリアルズ エルエルシーRohm and Haas Electronic Materials LLC | シアン化物を含まない銀電気めっき液 |
SG179381A1 (en) | 2010-09-21 | 2012-04-27 | Rohm & Haas Elect Mat | Method of electroplating silver strike over nickel |
US9145615B2 (en) | 2010-09-24 | 2015-09-29 | Yumei Zhai | Method and apparatus for the electrochemical reduction of carbon dioxide |
US8888984B2 (en) | 2012-02-09 | 2014-11-18 | Rohm And Haas Electronic Materials Llc | Plating bath and method |
US8980077B2 (en) | 2012-03-30 | 2015-03-17 | Rohm And Haas Electronic Materials Llc | Plating bath and method |
US9512529B2 (en) * | 2013-06-04 | 2016-12-06 | Rohm And Haas Electronic Materials Llc | Electroplating baths of silver and tin alloys |
JP6834070B2 (ja) * | 2016-06-13 | 2021-02-24 | 石原ケミカル株式会社 | 電気スズ及びスズ合金メッキ浴、当該メッキ浴を用いて電着物を形成した電子部品の製造方法 |
JP2019052355A (ja) * | 2017-09-15 | 2019-04-04 | 上村工業株式会社 | 電解Sn又はSn合金めっき液及びSn又はSn合金めっき物の製造方法 |
KR102552655B1 (ko) * | 2018-08-10 | 2023-07-06 | 쑤저우 레킨 세미컨덕터 컴퍼니 리미티드 | 발광소자 패키지 및 광원 모듈 |
CN115029745A (zh) * | 2022-07-08 | 2022-09-09 | 云南锡业集团(控股)有限责任公司研发中心 | 一种可减少元件镀层工艺步骤并提升焊点可靠性的方法 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4721817A (en) * | 1986-12-31 | 1988-01-26 | Shell Oil Company | Preparation of nonionic surfactants |
JP3012182B2 (ja) * | 1995-11-15 | 2000-02-21 | 荏原ユージライト株式会社 | 銀および銀合金めっき浴 |
JP3645955B2 (ja) * | 1995-12-19 | 2005-05-11 | ディップソール株式会社 | 錫−銀合金酸性めっき浴 |
US5902472A (en) * | 1996-01-30 | 1999-05-11 | Naganoken And Shinko Electric Industries Co., Ltd. | Aqueous solution for forming metal complexes, tin-silver alloy plating bath, and process for producing plated object using the plating bath |
JP3538499B2 (ja) * | 1996-05-15 | 2004-06-14 | 株式会社大和化成研究所 | 錫−銀合金電気めっき浴 |
JP3301707B2 (ja) * | 1997-01-20 | 2002-07-15 | ディップソール株式会社 | 錫−銀合金酸性電気めっき浴 |
JP3782869B2 (ja) * | 1997-07-01 | 2006-06-07 | 株式会社大和化成研究所 | 錫−銀合金めっき浴 |
JP4296358B2 (ja) * | 1998-01-21 | 2009-07-15 | 石原薬品株式会社 | 銀及び銀合金メッキ浴 |
JP3718790B2 (ja) * | 1998-12-24 | 2005-11-24 | 石原薬品株式会社 | 銀及び銀合金メッキ浴 |
JP3433291B2 (ja) * | 1999-09-27 | 2003-08-04 | 石原薬品株式会社 | スズ−銅含有合金メッキ浴、スズ−銅含有合金メッキ方法及びスズ−銅含有合金メッキ皮膜が形成された物品 |
-
2000
- 2000-05-30 DE DE10026680A patent/DE10026680C1/de not_active Expired - Fee Related
-
2001
- 2001-05-22 AU AU2001262313A patent/AU2001262313A1/en not_active Abandoned
- 2001-05-22 DE DE50101007T patent/DE50101007D1/de not_active Expired - Lifetime
- 2001-05-22 US US10/297,135 patent/US6998036B2/en not_active Expired - Fee Related
- 2001-05-22 EP EP01936389A patent/EP1285104B1/de not_active Expired - Lifetime
- 2001-05-22 CN CNB018106102A patent/CN1190523C/zh not_active Expired - Fee Related
- 2001-05-22 WO PCT/EP2001/005901 patent/WO2001092606A1/de active IP Right Grant
- 2001-05-22 JP JP2002500792A patent/JP4446040B2/ja not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO0192606A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE50101007D1 (de) | 2003-12-24 |
CN1432074A (zh) | 2003-07-23 |
JP4446040B2 (ja) | 2010-04-07 |
EP1285104B1 (de) | 2003-11-19 |
WO2001092606A1 (de) | 2001-12-06 |
AU2001262313A1 (en) | 2001-12-11 |
US20050029112A1 (en) | 2005-02-10 |
JP2003535222A (ja) | 2003-11-25 |
US6998036B2 (en) | 2006-02-14 |
CN1190523C (zh) | 2005-02-23 |
DE10026680C1 (de) | 2002-02-21 |
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