Comparison Chart

Criteria	Brush Plating	Welding	Metallizing	Electroplating
Precise Build-up Capability	Excellent	Poor	Poor	Fair to Good
Bond Quality	Excellent	Excellent	Fair to Good	Good
Thermal Distortion or Internal Stresses	None	Frequently	Sometimes	None
Density of Deposit (Porosity)	Very Dense*	Very Dense but with blow holes	70-90% theoretical density	Dense
Portable	Yes	Yes	Sometimes	No
Need for Post Repair Machining or Grinding	Not required on deposits up to .010in. on smooth surface	Always required	Most always required	Usually required
Hydorgen Embritement	No*	No	No	No

* Deposits are approximately 25% and 790% less porous than electroplated and metallized coatings respectively. *

Cobalt Machinable	Rockwell Hardness	Application
Cobalt Machinable	40Rc	Heavy metal build-up particularly in the repair of overmachined parts.
Copper (heavy build alkaline)	24Rc	Fills pits and scores, repairs part not subject to extreme heat or wear.
Nickel Acid High Build	55Rc	Build up of overmachined parts subkect to wear and/or heat.
Nickel High Speed	52Rc	Build up and resizing or worn or overmachined parts
Nickel Tungsten	68Rc	Hard wear resistant finish over other deposits.
Nickel Cobalt	58Rc	Build up and resizing of part subject to wear and above normal heat
Cadmium LHE**	40c	Used for corosion protection of aircraft parts on ultra high-strength steel