Alkaline bath for the electrodeposition of bright zinc
OwnerFrancine Popescuinventor
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Abstract
A zinc electroplating bath comprising as a brightener additive a reaction product of an heterocyclic pentagonal or hexagonal compound with a cyclic carbonate; the ensuing product is then reacted with an epihalohydrin or an alpha-dihalohydrin which ensuing product is then reacted with a compound of the general formula ##STR1## wherein x represents a hydrogen atom or a phenyl radical; R.sub.1 represents an alkenylene, alkylene, haloalkenylene, hydroxyalkenylene or carboxy (hydroxy) alkenylene group; and R.sub.2 represents a hydrogen atom or an alkyl, hydroxyalkyl, haloalkyl or halohydroxyalkyl group.
Claims21
An aqueous alkaline electroplating bath for bright zinc electrodeposition, comprising:
- (a) an aqueous solution of an alkaline zincate, and
- (b) a sufficient amount, effective to provide bright, ductile and uniform zinc electrodeposits, of a nitrogen-containing polymer, soluble in water, and obtained by the successive chemical reactions A, B and C, as follows:
- Reaction A:
- A heterocyclic pentagonal or hexagonal compound, comprising at least two nitrogen atoms in the aromatic ring, is reacted with a cyclic carbonate comprising carbon, hydrogen and oxygen atoms;
- Reaction B:
- The product of the reaction A is further reacted with an epihalohydrin or an alpha-dihalohydrin, in order to obtain an intermediary, water soluble, nitrogen-containing polymer;
- Reaction C:
- The product of reaction B is further reacted with a compound of general formula (1):
- ##STR8## wherein:
- X represents a hydrogen atom or a phenyl radical;
- R.sub.1 represents an alkenylene, alkylene, haloalkenylene, hydroxyalkenylene or carboxy (hydroxy) alkenylene group;
- and
- R.sub.2 represents a hydrogen atom or an alkyl, hydroxyalkyl, haloalkyl or halohydroxyalkyl.
An aqueous alkaline electroplating bath for bright zinc electrodeposition, comprising:
- (a) an aqueous solution of an alkaline zincate, and
- (b) a sufficient amount, effective to provide bright, ductile and uniform zinc electrodeposits, of a nitrogen-containing polymer, soluble in water, and obtained by the successive chemical reactions A, B 1 and C, as follows:
- Reaction A:
- An heterocyclic pentagonal or hexagonal compound, comprising at least two nitrogen atoms in the aromatic ring, is reacted with a cyclic carbonate comprising carbon, hydrogen and oxygen atoms;
- Reaction B 1:
- The product of the Reaction A is further reacted with an epihalohydrin or an alpha-dihalohydrin and an aliphatic amine or polyamine, in order to obtain an intermediary, water soluble polymer;
- Reaction C:
- The product of Reaction B 1 is further reacted with a compound of general formula (1):
- ##STR10## wherein:
- X represents a hydrogen atom or a phenyl radical;
- R.sub.1 represents an alkenylene, alkylene, haloalkenylene, hydroxyalkenylene or carboxy (hydroxy) alkenylene group;
- and
- R.sub.2 represents a hydrogen atom or an alkyl, hydroxyalkyl, haloalkyl or halohydroxyalkyl.
Dependencies are inferred from the claim text.