Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D233/00—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings
  • C07D233/02—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having no double bonds between ring members or between ring members and non-ring members
• • 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
  • C25D3/30—Electroplating: Baths therefor from solutions of tin
  • C25D3/32—Electroplating: Baths therefor from solutions of tin characterised by the organic bath constituents used

Definitions

• the invention relates to an acid tin-plating bath on the basis of sulphate, sulphonate, sulphamate or fluoroborate with the aid of which it is possible to obtain bright tin depositions.
• R represents a hydrogen atom, an alkyl group or a phenyl group and ,wherein R and R, each represent a hydrogen atom, an alkyl or OR wherein R represents an alkyl group in which a hydrogen atom is either replaced by an alkylated or nonalkylated nitrogen atom, or in which one or more hydrogen atoms are replaced by OH groups.
• a drawback of baths having these additions is that the polymerization occurring during use of the bath gives rise to pollution because the polymeric products have such a colloidal nature that they cannot be removed by filtering.
• the above-mentioned known electroplating baths provide a tin deposit which has a fine brightness over a wide range of current densities. This is notably important for tin-plating articles having a complicated shape, for example, highly profiled workpieces having sharp edges and small holes. In this case variations in the current density by a factor of not less than occur. However, at low values of the current density the brightness leaves something to be desired.
• the present invention provides an acid tin-plating bath which produces deposits having a hard uniform bright appearance throughout the current density range during tin-plating of the above-mentioned workpieces having a complicated shape, thus also at the lowest values of the current density occurring in practice.
• the baths do not tioned pollution. It is true that polymers are produced during use of the baths, but these are produced in such a shape that they can be removed by filtering without difficulty.
• the bath according to the invention which contains bivalent tin ions, sulphate ions, sulphonate ions, sulphamate ions or fluoborate ions as anions, a surface-active compound, an unsaturated compound having an aldehyde or ketone group as a brightening agent and at least one organic compound which contains an acryloyl group, is characterized in that the give rise to the above-menacryloyl-containing compound is defined by the following formula:
• R and R each represent hydrogen or an alkyl group or R and R combined, while being formed to a ring of fiveor six-membered rings consist of the group in which R is hydrogen, an acyl group or an alkyl group while each of the groups R to R may comprise substituents with the exception of N0
• the bath according to the invention includes sulphate ions and in a further preferred composition the surface-active compound consists of a polyoxyethylene compound.
• the brightening agent benzalacetone was added in a quantity of O.l6 g./l. to one of the following four known tin-plating baths which contained the following dissolved components per litre of liquid.
• Cal-I5 (Lissapol N" is a nonionic surface-active substance which comprises a condensation product of polyoxyethylene and alkyl phenol; "Ethomene S 20 is a cation-active wetting agent comprising polyoxyethylene l0) soyamine).
• An acid electroplating bath for depositing tin which bath contains bivalent tin ions, sulphate ions, sulphonate ions, sulphamate ions, or fluoborate ions as anions, a surface-active compound, an unsaturated compound having an aldehyde or ketone group as a brightening agent and at least one organic compound which contains an acryloyl group, characterized in that the acryloyl-containing compound is defined by the following formula:
• n is l, 2 or 3 and R, and R each represent hydrogen or an alkyl group or R and R combined, while forming a fiveor six-membered ring consist ofthe group CH CH CH or in which R represents hydrogen, an acyl group or an alkyl group while each of the groups R to R may contain substituents with the exception of N0 2.
• the acryloyl-containing compound is chosen from N,N'-methylene bisacrylamide, 1,3,5- triacryloyl, hexahydro-s-triazine, S-acetyl, 1,3 bisacryloyl hexahydro-s-triazine and NNbisacryloyl imidazoline.

Landscapes

• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Electroplating And Plating Baths Therefor (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=19807486

Family Applications (1)

Country Status (9)

Cited By (2)

Citations (5)

• 1969
  • 1969-07-16 NL NL6910903A patent/NL6910903A/xx unknown
• 1970
  • 1970-07-13 CA CA087963A patent/CA924260A/en not_active Expired
  • 1970-07-13 CH CH1061370A patent/CH565255A5/xx not_active IP Right Cessation
  • 1970-07-13 US US54596A patent/US3642590A/en not_active Expired - Lifetime
  • 1970-07-13 GB GB33845/70A patent/GB1300376A/en not_active Expired
  • 1970-07-13 JP JP45060700A patent/JPS4929054B1/ja active Pending
  • 1970-07-13 AT AT635770A patent/AT294516B/de not_active IP Right Cessation
  • 1970-07-14 BE BE753459D patent/BE753459A/fr unknown
  • 1970-07-16 FR FR7026230A patent/FR2051788B1/fr not_active Expired

Patent Citations (5)

Also Published As

Similar Documents