West Coast Corrosion Prevention Ltd.

 

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CATHODIC PROTECTION

Cathodic protection is the most widely applied electrochemical corrosion control technique. This is accomplished by applying a direct current to the structure which causes the structure potential to change from the corrosion potential (Ecorr) to a protective potential in the immunity region.

The required cathodic protection current is supplied by sacrificial anode materials or by an impressed current system.  Most metals in contact with an aqueous environment having a near neutral pH can be cathodically protected.

 Typical cathodic polarization curve for steel

Impressed Current Rectifier

Five 300 ampere marine oil cooled rectifiers. Units are supported by an automatic de-watering oil spill containment pan.

Marine Impressed Current Anodes Sled

Six anode cast iron sled complete with integrated cable and protective hose. Operation capacity of 75 amperes for 15 years.

Sacrificial Protection

Ductile municipal watermain protected from corrosion using tape wrap coating and sacrificial magnesium anodes.

Marine Sacrificial Anodes

96 kilogram (210 lb.) sacrificial aluminum anodes used for the protection of marine pipe pile structures.

Deep Well Anode Installation

Tubular cast iron anodes installed in a 300ft deep well complete with vent pipe and carrier pipe for coke installation from the bottom of the well up.

Horizontal Impressed Current Groundbed

Conventional groundbed using petroleum coke backfill and 2" cast iron anodes.

Close Intervall Survey

Over-the-line potential survey being performed using GPS synchronised data recorder and interrupters.

Tank Bottom Cathodic Protection

90' diameter tanks protected using an Impressed Current system. Picture notes installation of titanium mixed metal oxide anodes and 2 permanent reference electrodes for monitoring.

Applications

bulletPetroleum & Petrochemical: underground piping and storage tanks, above ground storage tank bottoms, internal surfaces of water storage tanks, heat exchangers and storage well casings
bulletMarine: ships, barges, buoys, steel or reinforced concrete dock structures, offshore pipelines, offshore drilling and production platforms
bulletPulp & Paper: effluent clarifiers, underground piping, aboveground storage tanks bottoms, foundation pilings, watermains and effluent discharge piping
bulletReinforced concrete structures: bridges, parking garages and foundations
bulletMunicipal: foundation pilings, iron and steel watermains, concrete pressure pipes, sewage treatment clarifiers, sewage pump stations
bulletElectrical Power Industry: cooling water pipelines & intakes, grounding systems, tower footings, penstocks, condensers

Technical Papers

Corrosion Control of Municipal Infrastructure - (160k pdf)

CP of Ice Shields on the Confederation Bridge - Northumberland Strait Crossing Project - (68k pdf)

You will need Adobe Acrobat Reader in order to view our Quick Reference Documents

 

 

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