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CHAPTER 3 CORROSION CONTROL - Coggle Diagram
CHAPTER 3
CORROSION CONTROL
MATERIAL SELECTION
SELECTION OF PROPER MATERIAL FOR PARTICULAR CORROSIVE SERVICE
METALLIC: METAL AND ALLOY
NON METALLIC: RUBBER ,PLSTICS
MODIFY ENVIRONMENT
CONTROL THE ENVIRONMENT
BY CONTROL THE RELATIVE HUMIDITY
BY REMOVING OF OXYGEN
BY CONTROL PH. TEMPERAURE/ PRESSURE/ VELOCITY/ IONIC CONTAMINANT
USE INHIBITOR
INSTALL PROTECTIVE COATING OVER MATERIALS
COATING/COVERING WITH MORE NOBLE METAL/BETTER CORROSION RESISTANCE PROPERTIES (METALLIC COATING)
NON METALLIC COATING
IMPOSE ELECTRIC CURRENT TO SUPPLY ELECTRON
ANODIC PROECTION
ADVANTAGES
CAN BE USED IN EXTREMELY AGGRESSIVE ENVIRONMENT
OPERATING CONDITIONS CAN BE EASILY CONTROLLED
OPERATING COST IS LOW
DISADVANTAGES
ONLY APPLICABEL TO ACTIVE-PASSIVE METAL
INSTALLATION COST IS HIGH
CATHODIC PROTECTION
ADVANTAGES
CAN BE USED FOR ALL METALS
INSTALLATION COST IS LOW
CORROSION RATE CAN BE REDUCED TO ZERO
DISADVANTAGES
CAN ONLY BE USED IN WEAK TO MODERATE ENVIRONMENT
OPERATING CONDITIONS MUST BE DETERMINED BY EMPIRIAL TESTING
PROPER DESIGN
DESIGN AWARENESS TO LIFE CYCLE