how does the corrosion occur? can we prevent it?

this topic will discuss how does the corrosion occur. where are the locations that are prone to corrosion, what are the types of corrosion.

1. CORROSION

2. WHY IT IS IMPORTANT

3. Corrosion is a natural process. Corrosion is an electrochemical reaction in which a metal is changed into a chemical salt. Corrosion is the deterioration of metal by chemical or electro-chemical attack and can take place internally as well as on the surface. CORROSION

4. The responsible factors for corrosion is the metal itself, the environmental chemicals, temperature and the design. Example: Formation of rust in the surface of iron.

5. There are two general classification of corrosion. These are direct chemical attack and electro-chemical attack. CLASSIFICATION OF CORROSION

6. DIRECT CHEMICAL ATTACK SPILLED BATTERY ACID

7. GALLEY

8. LAVATORY

9. ENTRAPPED CLEANING SOLUTIONS

10. An electrochemical attack may be likened chemically to the electrolytic reaction. In order to understand this class of corrosion we must understand the basic facts of electro-chemistry. ELECTRO-CHEMICAL ATTACK

11. Atoms A basic unit of element BASIC ELECTRO-CHEMISTRY

12. Molecules A cluster of atoms which make up the smallest identifiable unit of chemical compound

13. Example Sodium (Na) is a metallic element and consist simply atom. Combined with Chlorine (Cl) it forms a molecules of sodium chloride (NaCl) or common table salt.

14. Made up of protons with positive charges (+) and neutrons with no charge surrounding the nucleus with negative charge (-) (+) positive charge

15. ELECTRO-CHEMICAL ATTACK

16. BASIC REQUIREMENTS FOR CORROSION ANODE CATHODE ELECTROLYTE