Galvanic Corrosion

KSB seawater liftpump on an offshore platform, provided with Corrodium Anodes.

In seawater systems, galvanic corrosion is a major problem. Most problems occur when stainless steel is electrically and galvanically connected to carbon steel. A well known problem is stainless steel seawater liftpumps connected to the carbon steel pump caisson. The noble stainless steel causes high corrosion rates to the ignoble carbon steel. Corrosion rates of >10 mm/year have been reported. Ironhaven designs (cathodic) protection systems that assure an ideal protection potential of all metals and alloys involved.

Ironhaven is an expert in modelling galvanic corrosion and cathodic protection. By using this model, we supply and install the products for fighting the galvanic corrosion.

Often Corrodium anodes are used for fighting galvanic corrosion as the overall protection potential can be set to a ideal value, e.g. -850 mV Ag/AgCl. Corrodium anodes are controlled by electronic components, are self operating and can be switched to zero-resistance. The robustness and liftetime of Corrodium  anodes is similar to that of any other sacrificial anode. No cables, no power supply and no batteries. The anode (aluminium) and cathode (stainless/carbon steel) themselves function as ‘seawater battery’

Ironhaven bv is expert at preventing corrosion and other damage in submerged systems. Problems are forestalled by maintaining the ideal set protection potential.

Below a NACE paper about this subject:

Protection of Seawater Liftpump Caissons (NACE 2011)

 

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