What is electrodeposition process principle?

Electrodeposition technique has been around for a very long time. It is a process of coating a thin layer of one metal on top of a different metal to modify its surface properties, by donating electrons to the ions in a solution.

What are the factors influencing the electrodeposition process?

1.2 Factors influencing electrodeposition process The process of metal deposition is affected by (1) current density (2) temperature (3) hydrodynamic conditions (4) pH of the solution (5) nature of the metal (6) bath composition (7) addition agents (8) crystallography (9) impurities present in the solution.

What is difference between electroplating and electrodeposition?

Electroplating uses an electrical current to finish a contact or component with a thin layer of metal. The electroplating process is also known as electrodeposition. It is a galvanic or electrochemical cell acting in reverse. The part being plated becomes the cathode of the circuit.

What is electrodeposition?

During an electro-plating process a metallic coating is formed on the surface of objects like wires. Wires pass through a chemical solution that contains the corresponding ions of the metal of the coating. Electro-deposition is mostly used to apply coatings of copper, nickel, tin and zinc. …

What is electrophoretic process?

Electrophoresis is a laboratory technique used to separate DNA, RNA, or protein molecules based on their size and electrical charge. An electric current is used to move molecules to be separated through a gel. Pores in the gel work like a sieve, allowing smaller molecules to move faster than larger molecules.

How many types of electrodeposition process are there?

2.1. Electrodeposition is categorized into the following three processes: (1) electroplating, (2) electrophoretic deposition, and (3) underpotential deposition. For biomedical materials, ceramics and polymers are electrodeposited on metallic materials.

What are the characteristics of good electro deposit?

Many properties, including strength, wear resistance, corrosion resistance, etch rates, magnetic properties, are strongly dependent on the texture or crystal orientation of the electrodeposit, which in turn is dependent on all of the processing variables.

Does pH affect electroplating?

Basic Solutions. Basic electroplating solutions have a pH above 7. A basic solution forms hydroxide ions, or OH-. If the pH of the solution is very high, metal hydroxides such as ZnOH form and begin precipitating out of the solution, reducing the efficiency of the electroplating process.

What is difference between coating and plating?

The key difference between coating and plating is that coating can be done on both conductive and non-conductive surfaces, whereas plating can be done on conductive surfaces. Coating and plating are techniques used to cover surfaces of objects with a substance.

What is CED coating process?

Cathodic Electro Deposition (CED) is a process of coating an object having a conductive surface connected to a circuit as the cathode, by positively charged paint particles suspended in aqueous medium, under direct current1,2. CED coating is most widely used for automobile Components.

What is the need of electrodeposition?

Electroplating creates a protective barrier to reduce friction and prevent tarnishing of a surface as well as protecting surfaces from wear and tear by applying a thin, durable metal coating. Coating a non-metallic surface with metal changes the surface qualities of an object.

How is electrodeposition used in corrosion protection and control?

D. Sobha Jayakrishnan, in Corrosion Protection and Control Using Nanomaterials, 2012 Electrodeposition is a well-known conventional surface modification method to improve the surface characteristics, decorative and functional, of a wide variety of materials.

What does electro deposition do to a metal?

Electro deposition is the process of coating a thin layer of one metal on top of a different metal to modify its surface properties. Done to achieve the desired electrical and corrosion resistance, reduce wear&friction, improve heat tolerance and for decoration. E.D. is a surface coating method that forms an adherent layer of one metal on another.

How are metallic coatings obtained in electrodeposition process?

Metallic coatings are obtained in a conducting substrate by electro-deposition. The metal which is coated is exposed to a solution container containing a salt of the coating metal in a specially designed tank. The metal which is to be electroplated (workpiece) is made the cathode whereas the anode consists of a rod or sheet of the coating metal.

What are the steps in the electrodeposition process?

Electrodeposition process for MEA preparation involves several steps including impregnation of the porous carbon GDL with ionomer, exchange of cations in the ionomer with a cationic complex, followed by electrodeposition of platinum from this complex onto the carbon support.