Plating, Electroplating, & Electroless Plating.
Plating is a surface covering in which a metal is deposited on a conductive surface.
Electroplating is a general name for processes that create a metal coating on a solid substrate through the reduction of cations of that metal by means of a direct electric current.
Electroless plating, also known as chemical plating or autocatalytic plating, is a class of industrial chemical processes that create metal coatings on various materials by autocatalytic chemical reduction of metal cations in a liquid bath.
various kinds of plating as below:
Electroless nickel plating
From all of above plating, I’m most interested on nickel plating, chrome plating and gold plating.
Nickel electroplating is a technique of electroplating a thin layer of nickel onto a metal object.
Tools or equipment used to check the thickness of the nickel plating, you can use X-Ray Fluoressence (XRF); destroy the surface. but if you need to check the deposit behavior, you can use cross-section cutting and magnifier analysis by Scanning electron microscope (SEM).