COATING FOR CONDUCTIVITY
For components used as the base for automotive alternators, one application places an aluminum oxide coating on the component, followed by a coating of copper on top of the aluminum oxide. After coating, a circuit is soldered directly onto the copper coating. In a similar application, the base plate is made of aluminum. Since the circuit can’t be soldered to aluminum, the copper coating is applied directly onto the aluminum of the base plate. The circuit can then be soldered to the copper coating and still allow electrical contact to the aluminum.
Zinc is sprayed onto plastic enclosures that are to be used in electronic devices. The zinc is then grounded and is used to prevent electronic signals from escaping the plastic enclosure and affecting adjoining equipment with RFI (Radio Frequency Interference) or EMI (Electromagnetic Interference).