protection of condensers in power plants with high performance polymeric compounds written by:...
TRANSCRIPT
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Protection of Condensers in Power
Plants with High Performance Polymeric
CompoundsWritten By: Ricardo Chang
Presented By: Don Hilliard
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Essential Parts of a Condenser
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Types of Corrosion Pitting Corrosion Crevice
Corrosion
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Types of Corrosion Intergranular Corrosion -
Corrosion Fatigue
Galvanic Corrosion
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Types of Corrosion Stress Crack Corrosion
Flow Induced Corrosion Impingement Corrosion Entrainment Corrosion Cavitation
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Corrosion is…“A gradual wearing away or alteration by a chemical or electromechanical oxidizing process”
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Ferrous Alloys CorrodeWaterVelocityAcidityMotionTemperatureBacteria / Salts / Aeration
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Basic Corrosion Cell
Anode
Cathode
Conductor between Anode and Cathode
Electrolyte (salt or acid solution)
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Galvanic Series CORRODED END (ANODIC)
Magnesium Lead Silver Solder
Magnesium Alloys Tin Nickel (passive)
Zinc Nickel (active)Inconel (passive)
Aluminum 2S Inconel (active) Hastalloy C (passive)
Cadmium Hastelloy C (active) Silver
Aluminum 17ST Brass Graphite
Steel or Iron Copper Titanium
Cast Iron Bronzes Zirconium
Carbon Steel Copper – nickel alloys Gold
Stainless Steel Monel Platinum
PROTECTED - END (CATHODIC)
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Galvanic Corrosion
The # 1 Problem in Condensers
AlsoPitting
Crevis
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Solutions to Prevent Corrosion Cathodic Protection
Specialty Alloys
Barrier Coatings
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Belzona 1321
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Belzona 1341
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Belzona 1391
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Belzona 1591
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Belzona 5811
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Some Considerations Surface must be cleaned with an
angular abrasive to obtain a near white metal finish with a 3-mil surface profile.
Surface must be dry and free from contaminants.
Often several coats must be applied. Cure times may be excessive. Finished surface must be free from
pin holes or holidays (detection is required).
Low heat transfer coefficients.
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In Conclusion:
Equipment in wet operating conditions will corrode!!!!!
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Barrier Coatings can Provide:
Low Cost
Long Lasting Solution
To the overall problem of corrosion
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