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
  • C25D3/12—Electroplating: Baths therefor from solutions of nickel or cobalt

Definitions

• semi-bright nickel deposits are electrodeposited from aqueous acid nickel plating baths containing as the brightening additive a small but effective amount of phenylpropiolic acid or phenylpropiolamide.
• Baths from which the semi-bright nickel deposits are obtained in accordance with the present invention have excellent leveling and covering power.
• the deposit is relatively ductile, and in appearance, is finely grained, milky, and lustrous.
• the deposit appears to be columnar in nature as contrasted with the general lamellar-type deposit characteristic of bright nickel. It has been found to have excellent corrosion resistance.
• the deposit may be buffed to a bright finish or it may be used as the basis for electrodeposition of a bright nickel deposit, resulting in a corrosion resistant duplex nickel electrodeposit.
• baths for electroplating nickel contain nickel sulfate; a chloride, usually nickel chloride; a bufiering agent, usually boric acid; and a wetting agent, e.g., sodium lauryl sulfate, sodium lauryl ether sulfate, and sodium 7-ethyl- 2-methyl-4-undecanol sulfate.
• Such baths include the well-known Watts bath and other baths containing as the source of the nickel a combination of nickel fluoborate with nickel sulfate and nickel chloride, or a combination of nickel fluoborate with nickel chloride.
• a Watts-type bath containing about 300 g./l. (grams per liter) of nickel sulfate and about 60 g./ 1. of nickel chloride is preferred.
• Watts-type baths are generally within the concentration range noted in Table I.
• Nickel chloride 30 to 120 g./l.
• Boric acid 30 to 50 g./l.
• Temperature 30 to 65 C. pH 2.5 to 4.5 electrometric.
• acetylacetone between 0.5 g./l. and 5 g./l., and preferably 2 g./l. to 4 g./l.
• acetylacetone between 0.5 g./l. and 5 g./l., and preferably 2 g./l. to 4 g./l.
• methylhydroxybutanone between 0.5 g./l. to 3 g./l., and preferably 1 g./l. to 2 g./l.
• diacetone alcohol between 0.5 g./l. and 2 g./l., and preferably 1 g./l. to 2 g./l.
• 2- butene-1,4-di0l between 0.1 g./l.
• acetylacetone is preferred because of its low cost and adequate solubility characteristics (in excess of 20 g./l. in a Watts bath).
• Phenylpropiolle acid 0. 2 Phenylpropiolamide 0. 2 do 0.05 Phenylpropiolic acid 0.1 Phenylpropiolamide. 0. 45 6 Phenylpropiolie acid- 0.3 7 Phenylpropiolamide 0. 2
• both phenylpropiolic acid and phenylpropiolamide act as auxiliary brighteners in conjunction with the conventional sulfonated organic Secondary brighteners such as saccharin, sulfonated dibenzothiophene dioxide, and in conjunction with such primary brighteners as the heterocyclic, aliphatic, and aromatic nitriles, triphenylmethane, etc., to yield mirror-bright nickel.
• the semi-bright nickel electrodeposits are usually plated on copper or a copper alloy basis metal. However, they may be electrodeposited directly on such metals as iron, steel, etc.
• a Watts-type electrolytic bath for the electrodeposition of semi-bright nickel containing as the semi-bright additive (A) between 0.1 g./l. and 0.3 g./l. of phenylpropiolamide; together with (B) one auxiliary additive selected from the following group of five compounds in the amount indicated in parenthesis following the specified compound: acetonylacetone (0.5 g./l. to g./ 1.); acetylacetone (0.5 g./l. to 5 g./l.); methylhydroxybutanone (0.5 g./l. to 3 g./l.); diacetone alcohol (0.5 g./l. to 2 g./l.); and 2- butene-1,4-diol (0.1 g./l. to 0.2 g./l.).
• A between 0.1 g./l. and 0.3 g./l. of phenylpropiolamide
• B one auxiliary additive selected from the following group of five compounds in
• An aqueous electrolytic bath for the electrodeposition of semi-bright nickel consisting essentially of about 300 g./l. of nickel sulfate, about 60 g./1. of nickel chloride, and about 45 g./l. of boric acid, and containing as the semi-bright additive between 0.1 g./l. and 0.3 g./l.
• a process for electroplating semi-bright nickel comprising electrodepositing nickel from a Watts-type electroplating bath containing'as the semi-bright additive
• phenylpropiolamide in an amount between 0.025 g./l.
• a process for electroplating semi-bright nickel comprising electrodepositing nickel from a Watts-type electroplating bath containing as the semi-bright additive (A) phenylpropiolamide in an amount between 0.025 g./l. and 0.5 g./l.; together with (B) one auxiliary additive selected from the following group of five compounds in the amount indicated in parentheses following the specified compound:'acetonylacetone (0.5 g./l. to 5 g./l.); acetylacetone (0.5 g./l. to 5 g./l.); methylhydroxybutanone (0.5 g./l. to 3 g./l.); diacetone alcohol (0.5 g./l. to 2 g./l.); and 2-butene-L4-diol (0.1 to 0.2 g./l.).
• A phenylpropiolamide in an amount between 0.025 g./l. and 0.5 g./l.
• B one
• a process for electroplating semi-bright nickel comprising electrodepositing nickel from a Watts-type electroplating bath containing as thesemi-bright additive (A). phenylpropiolamide in an amount between 0.1 g./l. and 0.3 g./l.; together with (B) one auxiliary additive selected from the following group of five compounds inthe amount indicated in parenthesis following the specified compound: acetonylacetone (2 g./l. to 4 g./l.); acetylacetone (2 g./l. to 4 g./l); methylhydroxybutanone (1 g./l. to 2 g./l.); diacetone alcohol (1 g./l. to 2 g./l.); and 2-butene-l,4-diol (0.1 g./l. to 0.15 g./l.).

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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)
• Manufacture And Refinement Of Metals (AREA)

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Cited By (6)

Citations (4)

Family Cites Families (2)

• 0
  • NL NL271581D patent/NL271581A/xx unknown
• 1960
  • 1960-11-22 US US70924A patent/US3139393A/en not_active Expired - Lifetime
• 1961
  • 1961-09-27 GB GB34715/61A patent/GB996599A/en not_active Expired
  • 1961-11-03 FR FR877871A patent/FR1304964A/fr not_active Expired
  • 1961-11-21 DE DEM50949A patent/DE1208593B/de active Pending

Patent Citations (5)

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