La réhabilitation « In Situ » de structures
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La réhabilitation « In Situ » de structures métalliques enterrées fortement corrodées, un rêve ou une réalité?. Dr Ch. Pierre. Corrosion. Protection Cathodique . Critères de Protection Cathodique . L’Anode Alternative au Re-revêtement. Les Développements Futurs.

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La réhabilitation « In Situ » de structures

métalliques enterrées fortement corrodées,

un rêve ou une réalité?

Dr Ch. Pierre

  • Corrosion

  • Protection Cathodique

  • Critères de Protection Cathodique

  • L’Anode Alternative au Re-revêtement

  • Les Développements Futurs

ULB, 4 Novembre 2004






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Metal

Resistance

Used Since

Au  Au+ + e-

Indefinite

10 000 B.C.

Cu  Cu++ + 2e-

Resist well

7 000 B.C.

Fe  Fe++ + 2e-

Little

1 300 B.C.

Zn  Zn++ + 2e-

Little

1 500 A.D.

Na  Na+ + e-

Explosive

1 800 A.D.

Corrosion and Human History

ULB, 4 Novembre 2004



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Every type of corrosion can be

explained by differences

in either Solid or Liquid phase

  • Dissimilarity of Solid phase:

  • Dissimilar metals

  • Different thermal treatment

  • Scratches or abrasion

  • Differential strains

  • Differential grains and matrix composition

  • Grain boundaries

  • Differential grain size

  • Rough surface

  • Differential curvature

  • Dissimilarity of Liquid phase:

  • Differential electrolyte composition

  • Differential electrolyte concentration

  • Differential Oxygen concentration

  • Temperature differential

  • Differential electrolyte motion

  • Differential illumination

ULB, 4 Novembre 2004









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Our followed Criteria:

ULB, 4 Novembre 2004



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Deep Groundbed Anodes

ULB, 4 Novembre 2004








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- Discrete

Impressed

Current

- Continuous (AnodeFlexTM)

- Discrete

- Continuous

Types of Cathodic Protection

Galvanic


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