CADMIUM FREE GALVANIC ZINC ANODES

• DOI: https://doi.org/10.22533/at.ed.153132423107

• Palavras-chave: Zinc anodes, Cadmium, Electrochemical properties, Fishing industry.

• Keywords: Zinc anodes, Cadmium, Electrochemical properties, Fishing industry.

• Abstract:

  Galvanic anodes made of zinc alloys are commonly used in the fishing and marine industries for the protection of carbon steel and aluminum vessels, pipes, pumps and fittings, the most common being MIL-A-18001-K (ASTM B418 type I, which contains between 0.025 and 0.070 % cadmium and 0.1 to 0.5 % aluminum as alloying agents). In recent years, concern for the care of the oceans has led to actions that limit the use of certain metals in the manufacture of galvanic anodes (such as mercury and lead). Cadmium has been detected as a heavy metal highly contaminating marine life, which can be absorbed by plants and enter the food chain. The objective of this work is to manufacture cadmium-free zinc anodes for the fishing and naval industry with electrochemical properties similar to those obtained with zinc-aluminum-cadmium alloy anodes, capable of protecting carbon steel and aluminum in seawater.