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CHAPTER 6 ATMOSPHERIC AND HIGH TEMPERATURE - Coggle Diagram
CHAPTER 6 ATMOSPHERIC AND HIGH TEMPERATURE
ATMOSPHERIC CORROSION
COMBINES ELECTROCHEMICAL ATTACK, DIRECT CHEMICAL ATACK AND OXIDATION
OCCORS WHEN SURFACE IS WET BY MOISTURE FORMED
CORROSION OCCUR BY THE COMBINED EFFECT OF WATER AND OXYGEN AND CONTINUE AS LONG AS WATER AND OXYGEN ARE BOTH SUPPLIED
CLASSIFICATION
INDUSTRIAL
MARINE
URBAN
RURAL
IMPOTANT VARIABLE
TIME OF WETNESS
RELATIVE HUMIDITY
CONTAMINANTS
ATMOSPHERIC SALINITY
TEMPERATURE
HIGH TEMPERTURE INCREASE ELECTROCHEMICAL COROSION RATE
INCREASE ELECTROLYTE EVAPORATION
ONCREASE CRITICAL HUMIDITY TO FORM ELECTROLYTE
METHOD TO REDUCE
USE ORGANIC PAINTINGS
CORROSION MONITORING
DIRECT MEASUREMNT,MONITORING CORROSION DAMAGE
INDIRECT MEASUREMENT/MONITORING OF CORROSION DAMAGE WITH CORROSION SENSORS
SMART COATING
HIGH TEMPERATURE CORROSION
DOES NOT REQUIRE PRESENCE OF LIQUID ELECTROLYTE