EP0147463A1 - Plattierungslösung für eine zn-ni-legierung auf basis eines chloridbades - Google Patents

Plattierungslösung für eine zn-ni-legierung auf basis eines chloridbades Download PDF

Info

Publication number
EP0147463A1
EP0147463A1 EP83901938A EP83901938A EP0147463A1 EP 0147463 A1 EP0147463 A1 EP 0147463A1 EP 83901938 A EP83901938 A EP 83901938A EP 83901938 A EP83901938 A EP 83901938A EP 0147463 A1 EP0147463 A1 EP 0147463A1
Authority
EP
European Patent Office
Prior art keywords
chloride
alloy
deposits
liter
solution
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
EP83901938A
Other languages
English (en)
French (fr)
Other versions
EP0147463A4 (de
Inventor
Akira Matsuda
Takahisa Yoshihara
Hajime Kimura
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.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
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 Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Publication of EP0147463A1 publication Critical patent/EP0147463A1/de
Publication of EP0147463A4 publication Critical patent/EP0147463A4/de
Pending legal-status Critical Current

Links

Images

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
    • C25D3/565—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of zinc

Definitions

  • This invention relates to Zn-Ni alloy electroplating solutions for use in plating steel sheets to form Zn-Ni alloy deposits having improved surface appearance.
  • Zn-Ni alloy plated steel sheets have improved surface properties such as corrosion resistance, weldability, and paintability, and that Zn-Ni alloy deposits consisting essentially of a gamma-phase and having a nickel content in the range from 10% to 20% by weight exhibit the best corrosion resistance.
  • the chloride bath has the advantages that liquid flow has less influence on the nickel content of deposits, that it can be operated at higher current density, and that power consumption is lower because of the increased electric conductivity of the solution than is the case with the sulfate bath, but the bath is difficult to form deposits having good appearance.
  • the inventors continued investigations on the correlation between plating bath composition and alloy deposit composition in Zn-Ni alloy plating in order to produce Zn-Ni alloy deposits exhibiting improved appearance and having a nickel content within the above-defined optimum range.
  • the concentration of an additional chloride added should fall within a specific range in relation to the ratio of molar concentration between nickel and zinc.
  • the ratio of molar concentration between nickel and zinc is expressed as the molar concentration ratio of Ni 2+ /(Ni 2+ + Zn 2+ )
  • deposits tend to increase their nickel content substantially in proportion to this molar concentration ratio on one hand, and in proportion to the concentration of the additional chloride on the other hand. It has thus been found that the nickel content of deposits will consistently fall within the optimum range of 10% to 20% by weight when the concentration of the additional chloride is controlled within a proper range in relation to the molar concentration ratio of Ni 2+ /(Ni 2+ + Zn 2+ ).
  • a Zn-Ni alloy electroplating solution characterized in that the molar concentration ratio X expressed in percent of Ni 2+ /(Ni 2+ + Zn 2+ ) in the solution and the concentration Y expressed in mol/liter of an additional chloride added to the solution are controlled to fall within the range defined by the following equations:
  • the total concentration of nickel and zinc in the plating solution preferably ranges from 1 to 4 mols per liter of the solution.
  • Total concentrations of nickel and zinc of lower than 1 mol/ liter tend to form burnt deposits having unacceptable appearance.
  • At total concentrations of higher than 4 mols/ liter there are increased drag-outs from the plating bath, undesirably increasing the cost.
  • the plating solution is not particularly limited with respect to pH and temperature while it is practically at pH 1 to 6 and a temperature of 40° to 70°C.
  • the machanism by which the additional chloride in the plating solution has an influence on the nickel content of deposits is presumed as follows although the exact mechanism has not been well understood. Since the Zn-Ni alloy plating is codeposition of different metals, a barrier layer of zinc hydroxide Zn(OH) 2 formed at the cathode interface prevents nickel, which is otherwise readily depositable, from depositing so that even when the molar ratio of Zn to Ni is 1:1 in the bath, deposition of zinc preferentially takes place by way of the zinc hydroxide barrier layer.
  • the additional chloride in the plating bath has an influence on the appearance of Zn-Ni alloy deposits in the following way.
  • Zn-Ni alloy deposits There will be readily formed hydrated oxides and analogues on Zn-Ni alloy deposits in the presence of Cl - ions, to which OH - ions at the cathode interface contribute.
  • a chloride such as ammonium chloride NH 4 Cl is present in the bath, OH - ions are removed through the f J llowing reaction: so that formation of colored hydrated oxides is precluded, resulting in aesthetic Zn-Ni alloy deposits having metallic gloss.
  • Plating baths were prepared by adding ammonium chloride NH 4 Cl in amounts varying from 0 to 7.0 mols/liter (0 to 375 g/liter) to a solution containing 136 g/liter (1 mol/liter) of zinc chloride ZnCl 2 and 238 g/liter (1 mol/liter) of nickel chloride hexahydrate NiCl 2 ⁇ 6H 2 O and having a molar concentration of Ni 2+ adjusted to 50%.
  • electroplating was carried out at a current density of 75 A/ dm 2 so that the built-up of Zn-Ni alloy deposited might be 20 g/m 2 .
  • the resulting deposits were determined for gloss and nickel content.
  • the gloss and nickel content for each amount of ammonium chloride added are shown in Table 1.
  • the data of Table 1 reveal that colored deposits having poor appearance are formed in the absence of ammonium chloride, but the gloss and appearance of deposits are improved when ammonium chloride is added in amounts of 0.2 mols/liter or more.
  • the nickel content of deposits increases with the increasing amounts of ammonium chloride added and goes beyond the optimum range of 10% to 20% by weight when the amount of ammonium chloride exceeds 5 mols/liter.
  • Plating baths were prepared by adding ammonium chloride (NH 4 Cl) in amounts varying from 0.2 to 7.0 mols/liter to solutions containing varying percentage molar concentrations of zinc chloride ZnCl 2 and nickel chloride hexahydrate NiCl 2 ⁇ 6H 2 O. Using these baths, electroplating was effected at a current density of 75 A/dm 2 so that the build-up of Zn-Ni alloy deposited might be 2 0 g/ m 2 .
  • NH 4 Cl ammonium chloride
  • Fig. 1 shows the nickel content of deposits plotted relative to the concentration of ammonium chloride added for different molar concentration ratios of Ni 2+ /(Ni 2+ + Zn 2+ ).
  • the resulting alloy deposits all appeared aesthetically good, but the nickel content increased as the concentration of ammonium chloride added is increased, indicating that the concentration of ammonium chloride should fall within a proper range depending on the molar concentration ratio of Ni 2+ /( N i 2+ + Zn 2+ ).
  • X axis represents the molar concentration ratio of Ni 2+ /(Ni 2+ + Zn 2+ ) as expressed in percent
  • Y axis represents the concentration of the chloride as expressed in mol/liter.
  • Fig. 2 demonstrates that the optimum range is defined by the following three equations: It should be noted that the upper limit of 7.0 mols/liter was imposed on the concentration of the chloride in this example because it is the saturation level.
  • Zn-Ni alloy deposits can be readily and consistently formed having improved corrosion resistance, aesthetic appearance and a nickel content within the optimum range between 10% and 20% by weight.

Landscapes

  • 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)
  • Power Steering Mechanism (AREA)
  • Fluid-Driven Valves (AREA)
EP19830901938 1983-06-17 1983-06-17 Plattierungslösung für eine zn-ni-legierung auf basis eines chloridbades. Pending EP0147463A4 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1983/000196 WO1985000045A1 (en) 1983-06-17 1983-06-17 Zn-ni alloy plating solution based on chloride bath

Publications (2)

Publication Number Publication Date
EP0147463A1 true EP0147463A1 (de) 1985-07-10
EP0147463A4 EP0147463A4 (de) 1986-04-15

Family

ID=13790013

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830901938 Pending EP0147463A4 (de) 1983-06-17 1983-06-17 Plattierungslösung für eine zn-ni-legierung auf basis eines chloridbades.

Country Status (3)

Country Link
EP (1) EP0147463A4 (de)
JP (1) JPS60501896A (de)
WO (1) WO1985000045A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0162322A2 (de) * 1984-04-25 1985-11-27 Kawasaki Steel Corporation Erzeugung von mit einer Zn-Ni-Legierung plattierten Stahlstreifen
GB2321647A (en) * 1997-01-29 1998-08-05 Shinko Electric Ind Co Electroplating baths for nickel or nickel alloy
EP1914420B1 (de) 2006-10-19 2015-08-12 Siemens Aktiengesellschaft Windenergieanlage und Verfahren zur Steuerung der Ausgangsleistung einer Windenergieanlage

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2534280B2 (ja) * 1987-02-05 1996-09-11 日本パーカライジング株式会社 亜鉛系複合めっき金属材料およびめっき方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5855585A (ja) * 1981-09-25 1983-04-01 Kawasaki Steel Corp 亜鉛−ニツケル合金めつき液

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
No relevant documents have been disclosed *
See also references of WO8500045A1 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0162322A2 (de) * 1984-04-25 1985-11-27 Kawasaki Steel Corporation Erzeugung von mit einer Zn-Ni-Legierung plattierten Stahlstreifen
EP0162322A3 (en) * 1984-04-25 1986-05-28 Kawasaki Steel Corporation Production of zn-ni alloy plated steel strips
GB2321647A (en) * 1997-01-29 1998-08-05 Shinko Electric Ind Co Electroplating baths for nickel or nickel alloy
US5985124A (en) * 1997-01-29 1999-11-16 Shinko Electric Industries Co., Ltd. Nickel or nickel alloy electroplating bath and plating process using the same
GB2321647B (en) * 1997-01-29 2001-10-24 Shinko Electric Ind Co Electroplating baths and plating processes for nickel or nickel alloy
EP1914420B1 (de) 2006-10-19 2015-08-12 Siemens Aktiengesellschaft Windenergieanlage und Verfahren zur Steuerung der Ausgangsleistung einer Windenergieanlage

Also Published As

Publication number Publication date
WO1985000045A1 (en) 1985-01-03
EP0147463A4 (de) 1986-04-15
JPH0534191B2 (de) 1993-05-21
JPS60501896A (ja) 1985-11-07

Similar Documents

Publication Publication Date Title
Felloni et al. Electrodeposition of zinc-nickel alloys from chloride solution
EP0925388B1 (de) Elektroplattierung von nickel-phosphor-legierungsbeschichtungen
KR890001107B1 (ko) Zn-Fe 계합금 전기도금 강판의 제조방법
US3966564A (en) Method of electrodepositing an alloy of tin, cobalt and a third metal and electrolyte therefor
KR910002103B1 (ko) 아연계 복합도금 금속재료와 그 도금방법
US3804726A (en) Electroplating processes and compositions
JPH0338351B2 (de)
US4251329A (en) Process for producing a highly corrosion resistant electroplated steel sheet
KR910004972B1 (ko) 주석-코발트, 주석-니켈, 주석-납 2원합금 전기도금조의 제조방법 및 이 방법에 의해 제조된 전기도금조
JPH0151555B2 (de)
EP0147463A1 (de) Plattierungslösung für eine zn-ni-legierung auf basis eines chloridbades
US4610937A (en) Product of and process for preparing Zn-Ni-alloy-electroplated steel sheets excellent in corrosion resistance
CA1222720A (en) Zinc cobalt alloy plating
JPS6141998B2 (de)
NO137760B (no) Fremgangsm}te til fremstilling av en galvanisk utfelling av en jernlegering som inneholder nikkel eller nikkel og kobolt, og vandig pletteringsoppl¦sning for utf¦relse av fremgangsm}ten.
EP2978877A2 (de) Galvanisierungsbad für zink-eisen-legierungen, verfahren zur abscheidung von zink-eisen-legierungen auf einer vorrichtung sowie solch eine vorrichtung
US5489373A (en) Aqueous zinc solution resistant to precipitation
KR100256340B1 (ko) 아연-니켈 합금 전기도금욕 첨가제 및 이를 이용한 아연-니켈 합금 전기도금 강판제조방법
JPH1060683A (ja) 電気めっき三元系亜鉛合金とその方法
KR100576041B1 (ko) 조도 및 표면외관이 우수한 도금강판의 제조방법
US4740277A (en) Sulfate containing bath for the electrodeposition of zinc/nickel alloys
US3274079A (en) Bath and process for the electrodeposition of nickel and nickel-cobalt alloys
USRE29239E (en) Ternary alloys
JPS6367560B2 (de)
JPS6027755B2 (ja) 塩化物浴Ｚｎ−Ｎｉ合金めつき液

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19840104

AK Designated contracting states

Designated state(s): DE FR GB

Kind code of ref document: A1

Designated state(s): DE FR GB

RIN1 Information on inventor provided before grant (corrected)

Inventor name: YOSHIHARA, TAKAHISA

Inventor name: MATSUDA, AKIRA

Inventor name: KIMURA, HAJIME

A4 Supplementary search report drawn up and despatched

Effective date: 19860415

17Q First examination report despatched

Effective date: 19870623

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

RIN1 Information on inventor provided before grant (corrected)

Inventor name: KIMURA, HAJIME

Inventor name: MATSUDA, AKIRA

Inventor name: YOSHIHARA, TAKAHISA