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Blast furnace gas scrubber-Plate-Carbonic acid corrosion - Corrosion defects


Figure 1: Blast furnace gas scrubber-Plate-Carbonic acid corrosion.

Defect name: Blast furnace gas scrubber-Plate-Carbonic acid corrosion
Record No.: 196
Type of defect (Internal/Surface): Internal, surface
Defect classification: Corrosion defects
Steel name: Carbon steel.
Steel composition in weight %: No data.
Note:  
System: Blast furnace gas scrubber.
Part: Plate.
Phenomenon: Carbonic acid corrosion.
Appearance: Severe terraced attack.
Time to failure: 5 years.
Environment: BIast furnace gas containing 16-29% CO2; water.
Cause: The carbonic acid in the water attacks the steel.
Remedy: On reconstruction, protection was provided in the form of a coal tar epoxy coating.
Reference: Not shown in this demonstration version.