Clean steel components are dipped into a bath of molten zinc at a constant temperature and coated with a uniform layer consisting of iron-zinc alloys with pure zinc on the surface. Hot dip galvanizing is a well established steel treatment, the coatings are metallurgically bonded to the base steel forming an impervious barrier between the substrate and the corrosive environment.

Coating Thickness

The B.M.T. hot dip galvanizing process conforms to the BS EN ISO 1461:1999 which requires the zinc coating to be an average of 85 microns thick on steel components above 6mm thick. This clearly defined specification for galvanizing ensures that customers' components are processed with close control giving consistency of coating thickness and corrosion protection.

High Quality Zinc Coating to Inaccessible Surfaces 

Examples of sections and assemblies with hard-to-reach surfaces for mechanical cleaning. In hot dip galvanizing, all surfaces are coated equally well.

Resistance to Mechanical Damage

A zinc coating has a good resistance to mechanical damage. Initially the damage area appears to rust but soon the zinc coating corrodes to form insoluble zinc compounds which precipitate within this 'galvanic cell' to protect the steel.

Zinc Coating

A galvanic cell is formed. The zinc around the point of damage corrodes. Corrosion products precipitate on the steel surface and protect it.  The steel is also protected because it is cathodic in relation to the zinc coating.