Bright nickel-iron alloy electroplating bath and process

Abstract From the Canadian patent

An aqueous bath and process suitable for the electrodeposition of bright, high-leveling nickeliron alloy deposits on a conductive substrate comprising controlled, effective amounts of nickel ions iron, ions, an iron solubilizing agent a buffering agent, a primary brightening agent hydrogen ions to provide, a pH of about 2.6 to 4.5 and a bath soluble additive agent present in an amount of at least about 2 mg/l of the structural formula:, A particularly preferred additive agent comprises propargyl sulfonic acid and the alkali metal and ammonium salts thereof. The invention further contemplates the use of the aforementioned additive agent as a replenishing agent for nickel-iron electroplating …