Material and corrosion
All of Northcone's lighting poles are made of high strength steel, coated with a mixture of zinc, aluminum and magnesium - called Magnelis®. Magnelis is a revolutionary metal coating with significantly better corrosion resistance than traditional hot-dip galvanized coatings. Magnelis can withstand corrosion class C5 fduring 15 years, which gives all of Northcones lighting poles an unbeatable protection in tough, strongly alkaline environments or in environments containing chloride and ammonia.
It is also easy to paint on top of Magnelis. Northcone's poles can therefore be offered in any RAL color via powder coat or thermoplastic coat.
Below is a brief description of Magnelis as well as brief info on other materials and protection available on the market.
The secret of Magnelis is the fact that it is the only metal coating for steel with exactly 3% magnesium. The carefully tested amount of magnesium leads to a greatly increased corrosion resistance and extremely good properties in tough, strongly alkaline environments or in environments containing chloride and ammonia. In many cases, Magnelis can replace post galvanized parts, and in some cases also stainless steel applications. Magnelis is tested and approved by SITAC for use in environments up to corrosivity class C5.
As Northcone uses Magnelis in all lighting poles, and as Magnelis itself is already C5 class, you as a client do NOT need to spend money on finishing through iron glue poxy colour (rotlack).
Different corrision levels
When choosing a lighting pole from Northcone, you don't have to worry about how the sourrounding environment might affect the pole, thus which coating to choose. All our poles can handle corrision level C5 - the toughest corrosivity class, as standard. The poles can easily be placed both in the Swedish archipelago, or on a snow covered road in Finland. Likewise, you don't need to worry about the quality of your future maintenance. Our poles will do well anyway. Overall, our manufacturing reliabailty and product quality is so good that we dare to go out and promise 20 years product warranty on all our poles.
For other products on the market, however, it is important to find out the specific environmental requirements that apply to the installation and thus which choice of surface protection to be ordered.
The most common surface treatments on the market and their properties are described below:
We coat painting
Wet coat painting is a process in which you pre-treat the material by cleaning and blowing, then painting with primer, intermediate paint and topcoat. The corrosion level becomes C4-C5M (high - very high ex marine environment), but normally gives a slightly inferior UV resistance and scratch sensitivity compared to other painting methods.
Iron glue epoxy
Root varnish (iron glue epoxy) is a type of gray lacquer wet lacquer which in several manufacturers is sold as an extra option - a "rust protection" on the material. Increase the service life of the pole in environments that are aggressive, such as winter salted roads or coastal areas. Rotlack meets the highest corrosivity class ie C5M for 15 years (very high, ex marine environment).
If you choose Northcone's poles, you do not have to pay extra for this option or worry at all, as the pole already in its basic version of Magnelis, already meets the requirements in the toughest environments C5.
Hot dip galvanizing
Steel is generally the most widely used metal in the industry. Its only major disadvantage is that it rusts very quickly in many environments. For steel to rust (corrode) in ordinary environments, access to both water and oxygen is required. The most common method for protecting steel objects is therefore to use a metal coating of zinc, applied via a hot-dip galvanizing method that keeps moisture and oxygen away from the steel surface.
To protect against rust via hot dip galvanizing gives a corrosivity class around C3 (moderate). The advantages, however, are that the process is cheap. Often, however, one needs to improve the surface further, for example by painting later
Thermoplastic coating is a method where heat is used to melt a plastic powder over a metal in order to obtain a long lasting and more environmentally friendly corrosion protection. Thermoplastic increases the life of the product and reduces maintenance costs. The protection meets the requirements in extremely aggressive environments such as salt water, high concentrations of chemicals, wet or humid environments and in large temperature variations. It also provides a high resistance to scratches and physical impact. When the surface is solid, porous and strong, it also becomes more hygienic, dirt repellent and easier to clean. The corrosion level is C5M (very high, marine) and it also has very good UV resistance.
Powder coating is an environmentally friendly coating method that is often used in difficult environments or when there are requirements for long life, combined with great choice of color choice. The painting process has been developed for, among other things, the automotive industry and is adapted for steel, galvanized steel and aluminum. The corrosion level is C5M (very high, marine) and gives good UV resistance.