Composition for the electrolytic deposition of well levelled and ductile nickel coatings of mirror-like luster

Claim 1

ELECTROLYTE COMPOSITION FOR ELECTROLYTIC DEPOSITION OF WELL LEVELLED, DUCTILE NICKEL COATINGS OF MIRROR-LIKE LUSTER, SAID COMPOSITION COMPRISING AN ACID AQUEOUS SOLUTION OF A NICKEL SALT, BETWEEN ABOUT 0.01 G./L. AND ABOUT 15.0 G./L. OF AN ORGANIC SULFOXY COMPOUND SERVING AS BRIGHTENING AGENT, SAID ORGANIC SULFOXY COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF AN AROMTIC SULFONAMIDE, AN AROMATIC SULFONIMIDE, AN ALIPHATIC SATURATED SULFONIC ACID, AN ALIPHATIC UNSATURATED SULFONIC ACID, AND AN AROMATIC SULFONIC ACID, AND BETWEEN ABOUT 0.001 G./L. AND ABOUT 0.06 G./L. OF AN ORGANIC HETEROCYCLIC COMPOUND SOLUBLE IN SAID AQUEOUS NICKEL SALT SOLUTION AND CONTAINING A PYRIDINIUM RING FREE OF SULFONIC ACID SUBSTITUENTS, SAID HETEROCYCLIC COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF PYRIDINIUM, QUINOLINIUM, ISOQUINOLINIUM, AND ACRIDINIUM COMPOUNDS, THE HETEROCYCLIC NITROGEN ATOM OF SAID PYRIDINIUM RING BEING SUBSTITUTED BY THE ANION OF A WATER SOLUBLE ACID AND AN ALKYNYL RADICAL WITH 2 TO 6 CARBON ATOMS, SAID PYRIDINIUM RING CONTAINING ATTACHED TO TIS CARBON ATOMS SUBSTITUENTS RA AND YB, WHEREIN R IS LOWER ALKYL; Y IS HALOGEN; A IS A NUMERAL BETWEEN 3 AND 2; B IS A NUMERAL BETWEEN 0 AND 1; THE SUM OF A+B IS ONE WHEN SAID HETEROCYCLIC COMPOUND IS A PYRIDINIUM COMPOUND; THE SUM OF A+B IS NOT GREATER THAN 2 WHEN SAID HETEROCYCLIC COMPOUND IS A QUINOLINIUM OR ISOQUINOLINIUM COMPOUND; AND THE SUM OF A+B IS ZERO WHEN SAID HETEROCYCLIC COMPOUND IS AN ACRIDINIUM COMPOUND.