Electroplating PPT

Electroplating

Supervisor: Pham Thanh DuongGroup : Nguyen Thi Ngoc Diep

Vo Thi Thuy HaBui Thi Thuy Ngan

Main partDefinition

Brief history

Objectives

Preparing of surface

Electroplating process

Advantages and disadvantages

Definition of Electroplating

“Electroplating is a plating process in which metal ions in a solution are moved by an

electric field to coat an electrode.”

History of Electroplating

was first discovered by Luigi Brugnatelli in

1805

the use of more eco-friendly formulas

using direct current power supplies.

Objective of Electroplating

Prevent corrosion

Obtain a hard surface or attractive finish

Purify metals

Separate metals for quantitative analysis

E.g.: Cadmium, chromium, copper, gold, nickel, silver, and tin.

Preparing the Surface

1st step: cleaning

2nd step: treatment

3rd step: rinsing

Preparing the Surface

Chemical cleaning

Physical cleaning

How electroplating is done

Preparation

• Cathode made of copper or steel ;

Anode made of Nickel

• Blue wire attached to the Cathode and

negative pole of battery

• Red wire attached to the Anode and

positive pole of battery

• The cell filled with an Electrolyte

containing NiCl2

Process• The NiCl2 ionizes into water

NiCl2 --> Ni2+ + 2Cl-

• The object is negatively charged -> attracts Ni2+ and gives up electrons

• The nickel atom will be deposited on the surface of the part being coated

-> Electrodeposition

Faraday’s laws Electroplating is based on Faraday’s laws of electrolysis:

1st : the mass of a substance liberated in electrolysis is proportional to the quantity of electricity passed through the cell

2nd : the mass of the material liberated is proportional to its electrochemical equivalent.

The amount of nickel that would have been electroplated is proportional to the number of electrons the battery provides

Advantages &

Disadvantages

Variety of Uses

A wide range and size of items conductor parts - printing

rolls insides of wires and tubes

A wide range, shape and sizes of decorative applications jewelry, watches, optical

frames and writing instruments

Advantages

Advantages

Coatings: nickel, copper and chromium

not react with porcelain

enamels and electrical

connections

not change the fundamental

nature of their base metal.

Advantages

Advantages

Safety Rigid specifications promulgated by

governmental bodies, local associations and international standardization (ISO)how to perform coatingssafety standards to maintainequipment to use based on experience

and expert’s opinion

Advantages

Disadvantages

Coatings working on a molecular level

thin coat If repeat it over and over again

time consuming and expensive Uniformity

Sometimes be lumpy and uneven often grind and machine the parts

Disadvantages

DisadvantagesBrittleness

Electroplating a good coating of a superior metal onto a lesser metal => coating often be brittle and easy to crack

Micro-crack may lead to the overall destruction of the electroplated layer electroplate multiple layers

Disadvantages

References• http://www.ehow.com/search.html?

q=advantages+of+electroplating&skin=home• http://www.ehow.com/

list_6850757_electrolytic-plating-advantages.html

• http://en.wikipedia.org/wiki/Electroplating

Thank you for listening!