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La réhabilitation « In Situ » de structures métalliques enterrées fortement corrodées, un rêve ou une réalité? Corrosion Protection Cathodique LAnode Alternative.

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Presentation on theme: "La réhabilitation « In Situ » de structures métalliques enterrées fortement corrodées, un rêve ou une réalité? Corrosion Protection Cathodique LAnode Alternative."— Presentation transcript:

1 La réhabilitation « In Situ » de structures métalliques enterrées fortement corrodées, un rêve ou une réalité? Corrosion Protection Cathodique LAnode Alternative au Re-revêtement Critères de Protection Cathodique Les Développements Futurs Dr Ch. Pierre ULB, 4 Novembre 2004

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7 MetalResistanceUsed Since Au Au + + e - Indefinite B.C. Cu Cu e - Resist well7 000 B.C. Fe Fe e - Little1 300 B.C. Zn Zn e - Little1 500 A.D. Na Na + + e - Explosive1 800 A.D. Corrosion and Human History ULB, 4 Novembre 2004

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9 Every type of corrosion can be explained by differences in either Solid or Liquid phase Dissimilarity of Solid phase: Dissimilarity of Liquid 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 Differential electrolyte composition Differential electrolyte concentration Differential Oxygen concentration Temperature differential Differential electrolyte motion Differential illumination ULB, 4 Novembre 2004

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17 Our followed Criteria:

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19 Deep Groundbed Anodes ULB, 4 Novembre 2004

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23 :is a long-line impressed current anode ULB, 4 Novembre 2004

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27 Types of Cathodic Protection Galvanic - Discrete - Continuous (AnodeFlex TM ) - Discrete - Continuous Impressed Current

28 Impressed Current Anodes can be classified by Corrosion Rates: - Massive Anodes: kg/A year Carbon Steel, Silicon cast Iron, Silicon Cast Chromium Iron, Graphite - Semi Composite Anodes: g/A year Magnetite, Ferrite - Composite Anodes: mg/A year Titanium or Niobium + Platinum layer, Mix Metal Oxides (MMO) Failure Mechanism often not Caused by Faraday law All Anodes by definition ar consumed: Their Lifetime must be measured ULB, 4 Novembre 2004

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