Traditionally there have been three types of metal used in the construction of Water Trucks:
Galvanised steel is where regular steel sheets are coated in zinc to make them corrosion resistant.
Galvanising came about to help the prevention of rust and corrosion. It’s an important distinction because ‘regular’ steel is constructed of iron which rusts when exposed to any type of moisture; including rain, condensation, sea air and even high humidity. Rust will eat away at the steel until it flakes and disintegrates.
Today galvanised steel is known for the negative environmental impact - where once this was the most cost-effective methods.
Aluminium is a silvery-white, lightweight metal. It is soft and malleable. Aluminium is used in a huge variety of products including cans, foils, kitchen utensils, window frames, beer kegs and aeroplane parts. It is naturally corrosion resistant but:
Aluminium requires special processes to be welded, making it potentially difficult to handle. It is abrasive to tooling, or more accurately, the aluminium oxide coating that forms upon it is. It is more expensive than steel. Aluminium is not as tough or strong.
Stainless steel is a generic term for a family of corrosion-resistant alloy steels containing 10.5% or more chromium. All stainless steels have a high resistance to corrosion. This resistance to attack is due to the naturally occurring chromium-rich oxide film formed on the surface of the steel.
Stainless Steel is today's preferred method of water truck tank construction - it brings natural strength, durability and corrosion-resistance, and it provides the best, most cost-effective, long-term solution to handle the tough Australian environment, whilst in itself being a more environmentally friendly option.