Thermal spraying

The process of coating steel or iron with zinc by immersion in a bath of molten zinc, forming metallurgically bonded zinc-iron alloy layers with an outer zinc surface. The coating protects both as a barrier and sacrificially, continuing to protect the steel at small areas of damage.

A primer containing a high loading of metallic zinc dust in an organic binder, usually epoxy, or an inorganic silicate binder, providing galvanic protection to steel in a similar way to galvanising. It requires a high standard of blast cleaned surface so that the zinc makes electrical contact with the steel.

An electrochemical technique for controlling corrosion by making the metal structure the cathode of an electrochemical cell, using either sacrificial anodes or an impressed current system. It is widely combined with protective coatings on pipelines, ships, jetties and offshore structures.