|Type of plating||Characteristic value||Uses|
|Gold-cobalt alloy plating
(0.1 – 1% cobalt)
|- Contact resistance 0.58 – 0.62mΩ
- Hv150 – 180 (for contact)
- Corrosion resistance as the only non-oxidizing metal
- The only disadvantage is that the cost is high.
|Various contacts, switches, contacts|
|Rhodium (Rh) plating||- Hv800～1000
- Low contact resistance
- Corrosion resistance and oxidation resistance are as good as being insoluble in qua regia (nitric acid:hydrochloric acid = 1:3)
|Palladium (Pd)-based plating||- Hardness
Palladium plating Hv200 – 250
Palladium-nickel alloy plating Hv330 – 380
- Electrical resistance
Palladium plating 8.6mΩ
Palladium-nickel alloy plating 10mΩ
|Silver plating||- Hv110 – 130 (hard)
- Despite excellent electrical conductivity, the only disadvantage is its tendency for discoloration.
|Nickel plating, tin plating||- Used as a substitute for gold plating because the cost is low.
- Suitable for needs of approximately 100 or less extractions with maximum contact resistance of approximately 10mΩ because tin plating is soft. Since nickel plating is moderately hard, dull plating and semigloss nickel plating are used.