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What to Consider When Selecting Anodes

CAA anodes work in conjunction with coatings

Cathodic Anodes Australasia (CAA) is Australia’s largest manufacturer of Aluminium and Zinc anodes and QEP Marine is proud to be a distributor.

CAA has been casting anodes on the Sunshine Coast since 1984, with their anodes trusted to protect valuable assets including offshore oil rigs, floating FPSOs, pipelines, ports, wharves, desalination plants as well as assets in the mining and construction industries. CAA’s anodes also protect ships, yachts, marine motors and tanks.

Here, CAA’s business development manager Brent Linde discusses the difference between Aluminium and Zinc Anodes: 

1. ANODE CHEMISTRY – THE MOST CRITICAL CONSIDERATION: Aluminium and Zinc anodes have been manufactured around the world for a very long time. Both alternatives offer effective protection against corrosion. The important factor is to ensure that they are manufactured according to an internationally recognised chemistry. Industries such as Oil and Gas, Government, Defence and Mining are very strict when it comes to chemical composition. Their assets are extremely valuable and must be properly protected against corrosion, just like your vessel.

"Using coal fired power, Aluminium anodes produce around five times the carbon emissions compared to Zinc anodes," Brent Linde, CAA business development manager.
2. SO WHICH ANODES ARE MORE EFFECTIVE? Vessel type, its construction, where it is moored and how it is used are unique, so the choice between Aluminium or Zinc anodes requires further consideration.

If a vessel is experiencing corrosion related issues, CAA recommends seeking advice from an expert who has recognised qualifications. There are qualified specialists in corrosion engineering in every state of Australia and New Zealand.

CAA manufactures both Aluminium and Zinc anodes and we are happy to provide the most suitable solution.

"Whether you are buying Aluminium or Zinc, CAA are very proud to manufacture Australian Made Anodes and to keep employment opportunities strong for future generations," Brent Linde, CAA's business development manager.

3. ANODES AND THE ENVIRONMENT: Aluminium and Zinc anodes contain minute percentages of Cadmium. In Zinc and some Aluminium anode alloys, Cadmium is required to ensure the efficiency of the anode. Cadmium also occurs naturally in Aluminium primary metal, so when either Aluminium or Zinc anodes break down, a minute percentage of Cadmium is released.

Manufacturing Aluminium anodes requires a much larger amount of electrical energy compared to Zinc anodes. Using coal fired power, Aluminium anodes produce around five times the carbon emissions compared to Zinc anodes.

4. AUSTRALIAN MADE: Whether you are buying Aluminium or Zinc, CAA are very proud to manufacture Australian Made Anodes and to keep employment opportunities strong for future generations.

Next time you are buying anodes take the time to ask and understand where your anodes are made.