The effect of hydrogen on friction and wear of Ni–P electroless coating

The effects of charging and outgassing on friction and wear of Ni–P amorphous and nanocrystalline coating have been studied under ambient humidity and temperature. The results indicate that charging can improve the wear durability for Ni–P amorphous coating and inhibit formation of wear crack for brittle Ni–P nanocrystalline, which is due to atomic hydrogen because the wear behavior will restore after outgassing. Maybe, atomic hydrogen absorbed on the surface of the charged sample lubricates the surface in contact, resulting in reducing the friction coefficient and improving the wear durability.