FAQ's

Why galvanise?

Coating steel with a chemically bonded layer of molten zinc avoids the damaging results of steel corrosion. Steel corrosion quickly becomes a health and safety issue, it reduces the strength and durability of steel as well as the appearance.

The steel therefore needs to be repaired and maintained. The constant repair and maintenance costs can escalate upwards to many times the amount of the initial cost of galvanising.


What is hot dip galvanising?

Hot Dip galvanising is the superior option for galvanising steel. Hot dipping allows long steel life, depending on the coating thickness. Hot dip galvanising is a highly effective and cost efficient method to protect fabricated steel, structural steel, castings, or small parts from corrosion.

When sending steel through the Hot Dip Galvanising process, it undergoes rigorous preparation work, chemical treatment to remove impurities before finally dipping into a kettle of molten zinc at a temperature of around 450°C.

When exposed to the atmosphere, pure zinc reacts with oxygen to form zinc oxide, which further reacts with carbon dioxide to form zinc carbonate,a dull grey, fairly strong material that stops further corrosion in many circumstances, to deliver a reinforced metallurgically alloy bond that protects the steel from corrosion.

Hot dip galvanising with its durability, well-conditioned appearance and low maintenance schedule makes it suitable for countless steel products.


How thick is the galvanising coating?

Galvanising HB exceed above the AS/NZS 4680 standard specifying 85µm (microns) or 600gm/m2 for steel 6mm and over.

The HDG 900 standard requires a thickness of 125µm, which greatly improves the life span of the galvanised items and competes strongly against paint systems.


What is involved with the preparation?

We have a Steel Preparation PDF you can download here, or staff which can assist with preparing your job.