Au-Ni-SiO
2 dispersion coatings were prepared from an acid gold plating bath containing SiO
2 particles as a dispersion in an effort to improve hardness and wear resistance of the coating films. SiO
2 particles were easily codeposited in 22 karat gold-nickel alloy films. The amount of SiO
2 codeposited increased with an increase in the concentration of SiO
2 in the bath, depending on plating time and current density. Crystal violet as an addition agent was adsorbed to SiO
2, giving a positive charge, and influencing the codeposition of SiO
2. The Au-Ni-SiO
2 dispersion coatings were harder than 22 karat gold-nickel alloy films Hv 320 compared to Hv 270, and wear resistance, using test apparatus of wear (contacting member: pumice eraser, load: 4kg·cm
-2), wear resistance was found to increase about twice. Corrosion resistance, however, somewhat deteriorated.
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