Sacrificial Anodes

A sacrificial (galvanic) anode is a block of an active metal — magnesium, aluminium or zinc — electrically connected to a steel structure. Because it sits lower on the galvanic series, it corrodes preferentially and drives a protective current onto the structure, with no external power source. The anode is consumed over its design life and periodically replaced.

Magnesium has the highest driving voltage and is the default for buried pipelines and tanks in high-resistivity soil and freshwater. Aluminium (Al-Zn-In) gives the highest capacity per unit weight and is the primary choice for seawater and offshore service. Zinc is the stable, well-understood option for seawater and ship hulls. Send us the environment (soil, freshwater or seawater) and we will recommend the alloy.

Sacrificial anodes are self-powered by the anode alloy and suit marine structures, ship hulls, buried tanks and short or well-coated pipelines with a defined current demand. Impressed-current (ICCP) systems use an external DC rectifier and inert anodes, and suit long pipelines, tank bottoms and large or high-resistivity assets where a higher, adjustable current is needed. PCX supplies both.

We do not carry out the corrosion-engineering design ourselves, but for straightforward requirements our international manufacturing partners can assist with anode sizing from your data. Send the structure dimensions, environment, coating condition, design life and required current demand, and we will return anode types, masses and quantities with a quotation.

Yes. PCX supplies magnesium, aluminium, zinc and pure-iron sacrificial anodes across Thailand, sourced from qualified international manufacturers and supplied to recognised standards and your project specification. Send us the anode type, alloy, form, size or mass and quantity — or your structure and environment data — and we will return a quotation.