Protection of Condensers in Power

Plants with High Performance Polymeric

CompoundsWritten By: Ricardo Chang

Presented By: Don Hilliard

Essential Parts of a Condenser

Types of Corrosion Pitting Corrosion Crevice

Corrosion

Types of Corrosion Intergranular Corrosion -

Corrosion Fatigue

Galvanic Corrosion

Types of Corrosion Stress Crack Corrosion

Flow Induced Corrosion Impingement Corrosion Entrainment Corrosion Cavitation

Corrosion is…“A gradual wearing away or alteration by a chemical or electromechanical oxidizing process”

Ferrous Alloys CorrodeWaterVelocityAcidityMotionTemperatureBacteria / Salts / Aeration

Basic Corrosion Cell

Anode

Cathode

Conductor between Anode and Cathode

Electrolyte (salt or acid solution)

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)

Galvanic Corrosion

The # 1 Problem in Condensers

AlsoPitting

Crevis

Solutions to Prevent Corrosion Cathodic Protection

Specialty Alloys

Barrier Coatings

Belzona 1321

Belzona 1341

Belzona 1391

Belzona 1591

Belzona 5811

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.

In Conclusion:

Equipment in wet operating conditions will corrode!!!!!

Barrier Coatings can Provide:

Low Cost

Long Lasting Solution

To the overall problem of corrosion