NACE CIP Coating Inspector Level 1 Course
NACE CIP Coating Inspector Level 1 Course Fees 450 $ | NACE CIP Coating Inspector Level 1 Course Exam Fees 3200 $ | NACE CIP Coating Inspector Level 1 Course Duration 20 Days | NACE CIP Coating Inspector Level 1 Course Location Muscat
NACE CIP Coating Inspector Level 1 Course Corrosion
NACE CIP Coating Inspector Level 1 Course Corrosion is destruction or deterioration of a material usually a metal, because of its reaction with environment, to which it is exposed .The corrosion process acts on engineered materials, usually metals.
The materials other than steel such as wood, concrete and plastics are also subject to corrosion.
Metal is extracted from their ores, steel is an alloy of iron and carbon.
NACE CIP Coating Inspector Level 1 Course covers the most common product of corrosion is an oxide of iron (Rust or Iron oxide) formed by the addition of oxygen .corrosion is the reverse process of steel manufacturing.
NACE CIP Coating Inspector Level 1 Course covers the most common examples of corrosion are
1.Rusting of iron
2.Tarnishing of silver, copper Nickel etc.
Rusting of Nail.
Corrosion Rate differ from Metal to metal . NACE CIP Coating Inspector Level 1 Course Corrosion is the reverse process of steel manufacturing.
In some metals Corrosion proceeds at slower rates .The slower corrosion rates of these metals is often due to the production of a tightly adherent surface layer formed from the corrosion product (oxide, chloride sulphate or other compound).
The formation of a thin protective oxide layer on the surface of a metal when reacting with oxygen from atmosphere is called passivation.
This acts as a barrier layer. E.g.: Copper, stainless steel, Brass, Zinc, Aluminium, Nickel chromium.
Corrosion is also called an electro chemical process .It involves the flow of ions and electron’s through an electrolyte and a metallic path .Both electrons and ions carry the corrosion current .
The Corrosion Cell
In a corrosion cell 4 elements are present,
·Anode
·Cathode
·Metallic path
·Electrolyte ACME can be identified in dry battery cell.
Anode
a.The anode is that part of the metal that corrodes (i.e., dissolves in the electrolyte) and become positively charged ions. The electron generated are conducted to the cathode .Metal deterioration occurs at the Anode.
b.Oxidation takes place at anode
c.Anode has negative polarity
d.Anode is the less noble area
Cathode
a.The cathode is a part of the metal that receives election from anode.
The reaction at cathode ionizes the electrolyte to form species such as hydrogen (as gas) and hydroxyl ions .These often combine with the dissolved metal to form compounds , such as ferrous hydroxide (in case of iron /steel ), reacting further to become iron oxide or rust.
Metallic Path
The return path connects the anode and cathode and allows the passage of electrons .Electrons leave anode and travel through metallic path to cathode. Steel surface has both anodic and cathodic sites. When two dissimilar metals are not in contact an external connection is required for a corrosion reaction.
Electrolyte
An electrolyte is a medium that conducts ionic current. Electrolytes are solution containing ions .When atoms lose or gain electrons ions are formed. Salt when dissolved in water ions are formed
Pure water is a weak electrolyte.
Ions have a positive or negative charge and are called cations and anions.
Anions are negatively charged ions and attracted to the anode.
Cations are positively charged ions and attracted to the cathode.
Stronger the concentration of electrolyte, higher becomes the corrosion rate.
If any one member in ACME is not present, corrosion will not takes place.
NACE CIP Coating Inspector Level 1 Course, When dissimilar metals are connected, the most active (or anodic) metal corrodes more rapidly, while the more noble (cathodic) metal is protected.
The metals which absorb more energy and corrodes easy and fast
They are called ‘Active metals‘. Active metals are seen in top of galvanic series.
E.g.: Magnesium, Zinc, Aluminium
Metals which absorbs less energy and do not undergo corrosion easily .They are called “Passive or Noble metals“.
These elements are seen at the bottom of galvanic series.
E.g.: Gold, silver, platinum
These metals exist in pure form as their ores.
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