Galvanizing & Shotblasting

Galvanizing benefits

• Hot Dip Galvanizing (HDG) is specified for enhanced protection of mild steel for the external environment.
• Powder coating further improves the protection (a duplex coating), with added aesthetic appeal.
• The post-galvanizing Silane pre-treatment process is designed for HDG.
• Powdertech offer up to 25-year guarantees for powder coating on galvanized steel.
• For efficiency in turnaround we use only one galvanizing partner, Premier Galvanizing Ltd.
• We work closely with you ensure the design optimizes the corrosion protection and the powder coated finish. If the material requires alteration such as extra ventilation holes, we can put these in for you.

Galvanizing standards

Hot dip galvanizing is governed by a single European Standard, EN ISO 1461.

The European Powder Coating Standard BS EN13438 and ISO 15773 is written specifically for the powder coating of galvanized steel, it recognises that technical and logistical cooperation between the galvanizer and powder coater is key to a successful final coating.

Our partnership with Premier Galvanizing means that you are fully supported with all the technical information you need. For specific advice see Design Tips and download the data sheet. You are of course able to use your own galvanizer if you prefer.

Shot or Grit blasting

• Roughens the surface of mild steel to increases adhesion of powder primers. Powder primer coats give an additional layer of corrosion protection without the need for galvanizing.
• Reduces some surface defects in base material.
• Done before galvanizing, blasting increases the thickness of the zinc layer for extended system life.
• Can be used as a second stage in paint stripping.
• Cleans rusty material to reveal base metal.
• Helps to dull sharp edges and reduce corrosion origination points

Shot or Grit blasting continued ...............

• Steel fabrications that can't be galvanized will benefit from shot blasting and powder priming for external applications.
• Where drainage holes and visible welds are not wanted, making galvanizing impossible, shot blasting and powder priming may be an alternative. This can increase design possibilities for complex fabrications.
• Shot blast and priming must always be followed by the application of a polyester top coat.