FILM FORMATION METHOD FOR GOLD-IRON-BASED AMORPHOUS ALLOY PLATING THIN FILM, ELECTROPLATING LIQUID, AND GOLD-IRON-BASED AMORPHOUS ALLOY PLATING THIN FILM

摘要

PROBLEM TO BE SOLVED: To provide a gold-iron-based amorphous alloy plating thin film which is composed of a homogeneous amorphous alloy free of fine crystals, has high hardness unattainable with conventional hard gold plating thin films and amorphous gold alloy plating thin films and is thus useful as a contact material for e.g. complex and fine micro-connectors and micro-relays.SOLUTION: An amorphous alloy plating thin film containing gold and iron is formed on a to-be-plated object by electroplating with a current density of 20 mA cmby using an electroplating liquid containing a water-soluble gold salt, a water-soluble iron salt, citric acid and glycine and having a pH of 4-11.