Zinc Anodes

Our zinc anodes are efficient corrosion protectors in applications were temperature exposures do not exceed 120°F (50°C). They meet the latest milspec revision and are also covered by ASTM-418-95 Type I. Typical uses in deep, cold water or saline mud include:

  • Ship Hulls
  • Ballast tanks
  • Sea chests
  • Engine Rooms
  • Pipelines
  • Piers
  • Docks
  • Buoys

Houston’ mil-spec anodes operate at a nominal 95% efficiency in seawater. Galvanic efficiency relates directly to the anode’s service life. Some commercial anodes develop dense corrosion byproducts with high electrical resistance on their surface that restricts current flow. In some cases, the anode’s productive life ends before the entire available anode is consumed. Houston Anodes’ anodes resist the formation of hard, dense corrosion byproducts and continue producing protective current until they are completely consumed. This longer life means fewer replacements and reduced overall operating costs.

ZINC MIL-A-18001-K (%)

Iron (Fe) 0.005 max
Lead (Pb) 0.006 max
Copper 0.005 max
Cadmium (Cd) 0.025 - 0.07
Aluminum (Ai) 0.1 - 0.5
Others (each) 0.10 max
Zinc (Zn) remainder


Open Circuit Potential -1.05 Volts (Ag/AgCl)
Nominal Current Capacity 780 amp-hr/kg

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Houston Anodes

  • Right Chemical Composition

  • Right Electrochemical Properties

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