めっき技術

Thermal resistance

While molten aluminum plating is used to prevent degradation by high-temperature oxidation (400°C) of steel materials, industrial chromium plating and nickel-tungsten alloy plating now play an active part in electroplating.
Type of plating Characteristic value Uses
Industrial chromium plating - In a high-temperature oxidation atmosphere of 400°C, the hardness drops from Hv1,000 to Hv600. Waste incinerators, heaters, automotive mufflers, boiler parts, glass molds, etc.
Nickel plating and nickel-tungsten alloy plating - Nickel plating is usable even at high temperatures of approximately 300 – 500°C.
- Nickel-tungsten alloy plating is utilized for glass molds subject to continuous use at approximately 600°C.
For details, see the illustration below.
Electroless nickel plating - Thermal resistance is up to approximately 200°C.
Ni-B > Ni-P
Nickel-cadmium dispersed plating - Used for aircraft engine bolts requiring thermal resistance and corrosion resistance. Aircraft parts
採用事例
Thermal resistance
Hot hardness of nickel-tungsten alloy plating
(From “Kino Mekki Himaku no Bussei” edited by Denki Mekki Kenkyukai, Nikkan Kogyo Shimbun Ltd.)