Sacrificial Anode Cathodic Protection

An efficient solution for Marine and Offshore corrosion prevention and cathodic protection

sacpimg1
In cathodic protection, pieces of metal (known as Sacrificial Anode) are linked electrically to the ship’s hull. These anodes, are made of metals more reactive than the material used for the ship’s body and systems. As such, they will corrode in place of the ship’s body and systems while the ship stays protected, giving rise to the name ‘Sacrificial Anodes’.

Sacrificial anodes are also deployed on:

  • subsea strcutures
  • pipelines
  • platforms
  • wind turbine foundations
  • monopiles
  • wave and tidal generators
  • quay and harbour walls
  • jetties & pontoons
  • dock gates
  • ships and boats hulls
  • ballast
  • grey and potable water tanks
  • power station intake screens
  • storage tanks

To sum it up, Sacrificial Anodes can be effectively deployed wherever there’re metal parts partially or fully submerged in seawater, to protect these parts from marine corrosion; Cathodic Protection.
Cathodic Marine specializes in manufacturing large platforms, bracelet and flush mounted Anodes, in sizes up to 4 tonnes (4000 KG), in line with the highest standards and quality of Marine and Offshore industries.

Advantages of using Sacrificial Anodes

sas2

There’re a multitude of benefits associated with the use of Sacrificial Anodes, the main ones being:

  1. Capacity to last and provide effective Cathodic Protection for up to 25 years
  2. No maintenance required
  3. Very high reliability
  4. No modifications on hull interior, and no hull penetrations
  5. Zero risk of interference
  6. Compatibility with other CP systems on subsea equipment
  7. Lower overall life cycle cost

Full range of anodes

full-range-anodes
Full range of anodes (Different Types Of Anodes And Their Various Uses)

  • Aluminium and Zinc anodes for Ship Hulls and Ballast Tanks
  • Aluminium Bracelet Anodes for Platforms ,Structures and Pipielines
  • Magnesium anodes for Fresh Water requirements
  • Zinc and Aluminium anodes for Condensers and Heat exchangers
  • Zinc Element, Rod and Plate anodes for Engine Coolers

Zinc Anodes are cast from a high purity zinc alloy to ensure an even corrosion pattern, reliable electrical efficiency and long working life. The zinc alloy is in accordance with the US MIL A-1800H specifications.

Zinc Anodes Specifications

  • Aluminium : 0.10 – 0.50 %
  • Cadmium / Amp.Yr : 0.025 – 0.15 %
  • Lead / kg : 0.006 % max
  • Iron : 0.005 % max
  • Copper : 0.005 % max
  • Silicon : 0.125 % max
  • Zinc : Remainder
Performance Standards

 

  • Open Circuit Potential w.r.t. Ag/AgCl: -0.95V
  • Consumption Rate : 11.25 Kg
  • Anode Capacity : 780 Amp.Hr

Aluminium Anodes are cast in alloys of aluminium & indium plus additions and have been developed specifically for use in seawater.

Zinc Anodes Specifications

  • Zinc : 2.0 – 5.0 %
  • Copper / Amp.Yr : 0.05 % Max
  • Silicon Amp.Hr / kg : 0.13 % max
  • Iron : 0.13 % max
  • Indium : 0.01 -0.05 %
  • Aluminium : Remainder
Performance Standards

 

  • Open Circuit Potentialw.r.t. Ag/AgCl : -1.07V
  • Consumption Rate : 3.4 K
  • Anode Capacity : 2500

 

sa3

A typical Ballast Water Tank where sacrificial anodes are fitted to protect against corrosion.

SOLVING YOUR CHALLENGES

Geared with a team of experienced, well-trained personnel possessing the required skills and an extensive knowledge of the CP market ,allows it to secure various projects with valuable and profile centric project management to cater to the Marine & Offshore Sectors.