Hot Dip Galvanizing (HDG)
Details
- Product Type Coatings and Finishes, Construction Services, Galvanizing
- Regions Australia, Australian Capital Territory, New South Wales, Northern Territory, Queensland, South Australia, Tasmania, Victoria, Western Australia
Contact
- Peter Golding +61 3 9654 1266
- Website Visit
- Email gaa@gaa.com.au
ISupplier
- Company Name Galvanizers Association of Australia
- ISupplier Profile Visit
About
Hot dip galvanizing (HDG) to AS/NZS 4680 protects steel from corrosion by providing a thick, tough, metallurgically bonded zinc envelope completely covering the surface and stopping the steel from experiencing the corrosive action of its environment. It can be applied to an extensive selection of steel grades with a wide variety of shapes, sizes and functions; from single structural sections to large fabricated frames, from general road furniture to reinforcing bars.
Our members, who are listed in the Galvanizers tab on our website, provide the HDG service. The process begins with the arrival of steel at the galvanizing plant. The typical processing of the steel consists of pre-treatment that chemically cleans the steel’s surface, via caustic degreasing, acid pickling and fluxing, before the steel is immersed in a molten zinc bath where the hot dip galvanized coating is formed. The final stage of the process is generally quenching in a solution that promotes passivation of the zinc surface and then the hot dip galvanized steel product is transported back to the customer or direct to the end user.
Sustainability Outcomes
The life of hot dip galvanized steel in the Australian environment is easily predicted using AS/NZS 2312.2, which provides a durability range for the coating depending on thickness and location. For example, the durability of an 85 μm thick coating may extend to over 100 years in many capital cities to around 10 years immediately adjacent to surf beaches. This may assist achieving points in ISv2.0 Ecn-4. Hot dip galvanized steel’s excellent performance is due to its inherent corrosion resistance, high tolerance to mechanical damage and inertness to the high UV levels prevailing over all of Australia.
At the end of life, the remnant primary components of a hot dip galvanized article, zinc and steel, are both recyclable into equivalent or higher quality products and this demonstrates hot dip galvanized steel’s intrinsically sustainable nature. may contribute towards ISv2.0 Rso-1 & Rso-6 and ISv1.2 Mat-1, Was-2 and Was-3.
Galvanizers Association of Australia (GAA) has an industry EPD that covers steel products, such as hot-rolled structural steel sections, steel plate, and hollow structural steel sections, that are hot dip galvanized after fabrication by Australian members of the GAA. The EPD data can be used in the Materials Calculator used in ISv2.0 Rso-6 and may also help your project achieve points associated with ISv2.0 Rso-7 and ISv1.2 Mat-2.