Is the solar energy bracket selected from steel or aluminum?

The material of the solar energy bracket  is generally made of steel or aluminum or a mixture of the two, so many people will ask which material is better. This paper gives a comparison of the material of the solar energy bracket for this problem:

1, the material strength: the strength of steel is better than aluminum , generally in the case of strong winds and large spans, steel is better than aluminum. 

2, deflection deformation: the deflection of the structure is related to the shape size and elastic modulus of the profile. Under the same conditions, the deformation of the aluminum alloy profile is 2.9 times that of the steel, the weight is 35% of the steel, and the same weight in terms of cost. Under the aluminum, aluminum solar energy bracket is three times that of steel, and steel is better than aluminum. 

3、Anti-corrosion: The aluminum solar energy bracket alloy is in the passivation zone under the atmospheric environment, and a dense oxide film is formed on the surface, which hinders the contact of the surface of the active aluminum substrate with the surrounding atmosphere, so it has very good corrosion resistance. And the corrosion rate decreases with time. Steel under normal conditions, the degree of corrosion is good, but in high humidity industrial areas or high salinity beaches or even temperate sea water, the corrosion rate is accelerated, and annual maintenance is required. Therefore, aluminum is superior to steel in anti-corrosion.