Corrosion Control Engineer

1. What is corrosion?

2. Corrosion Cell

3. How to detect corrosion

4. Corrosion prevention methods

4.1 Protective coating

4.2 Cathodic protection

5. Corrosion prevention in Manitoba Hydro

IEEE PES Winnipeg | Fernando Velandia P. Eng. | Corrosion in Action | October 2015

Increase Energy

Natural State

InstallationProcessed Material

Back to Natural State


e-

Metallic Path

e-

e-

e-

- ions

e-

e-

e-

+ ions


Iron - Fe

Electrolyte

Water, soil,

etc

Fe++

e-e-

2H+O=H2O Fe(OH)2

H2OOH-H+

OH-

O2

Fe++e-e-

H2O H+

Fe++

e-e- H2OOH-

H+

OH-

2Fe(OH)2 + O2==Fe2 O3 + H2O

e-e-

H2O H+Fe++

2Fe(OH)2 + O2==Fe2 O3 + H2O


H+

Electrolyte

Water, soil,

etc H2

e-

e-

H+

H+

H2

e-

e-

H+

H+

H0

e-

e-

H+

H0

H0

H0

H0


Conventional

electric current

direction

Electrolyte

Active Noble

+--V


2011

• Monthly calibration

2013

• Yearly calibration

2015

• 20 years calibration


2011• Voltmeter

2015• Computerized Data-

collector

Monitoring & evaluation | Data collectors


Corrosion Prevention Methods


Cathodic protection by galvanic anodes



Cathodic protection by

impressed current systems

Components of impressed current systems


Impressed current systems of

steel natural gas pipelines



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