At present, the main anti-corrosion method of photovoltaic bracket steel using hot dip galvanized 55-80μm, aluminum alloy using anodic oxidation 5-10μm.
Aluminum alloy in the atmospheric environment, in the passivation zone, its surface forms a layer of dense oxide film, hindering the active aluminum matrix surface contact with the surrounding atmosphere, so it has very good corrosion resistance, and the corrosion rate decreases with the extension of time.
Steel in ordinary conditions (C1-C4 category environment), 80μm galvanized thickness can ensure the use of more than 20 years, but in high humidity industrial areas or high salinity seashore or even temperate seawater corrosion rate is accelerated, the amount of galvanization needs to be more than 100μm, and the need for regular maintenance every year.
Comparison of other aspects
1) Appearance: Aluminum alloy profiles have many kinds of surface treatment, such as anodic oxidation, chemical polishing, fluorocarbon spraying, electrophoretic painting. The appearance is beautiful and can adapt to a variety of strong corrosive effect of the environment.
Steel is generally hot dip galvanized, surface spraying, paint coating and so on.
(2) cross-section diversity: aluminum alloy profiles are generally processed in extrusion, casting, bending, stamping and other ways. Extrusion production is currently the mainstream production mode, through the opening of the extrusion die, can achieve the production of any arbitrary cross-section profiles, and production speed is relatively fast.
Steel is generally used in roller pressing, casting, bending, stamping and other methods. Roller pressing is currently the mainstream production of cold-formed steel production. Cross-section needs to be adjusted through the roller pressure wheel set, but the general machine can only produce similar products after the stereotypes, size adjustment, and the cross-section shape can not be changed, such as C beam, Z-beam and other cross-section. Roller pressing production method is more fixed, production speed is faster.
Comprehensive performance comparison
(1) Aluminum alloy profiles are light in quality, beautiful in appearance, excellent corrosion resistance, generally used in roof power stations that require load-bearing, strong corrosive environments, such as chemical plant power station, etc. Aluminum alloy as a bracket will have better results.
(2) High strength of steel, small deflection and deformation when bearing loads, generally used in ordinary circumstances of the power station or used for the components of the force is relatively large. In addition, galvanized c channel can be used to manufacture buckets, loaders, dump trucks, crushers, powder selectors, Galvanized Channel withstand any form of wear and tear from a wide variety of rocks, sand and gravel. With excellent welding performance, impact strength and bending performance, suitable for working in a strong abrasive environment, such as high-strength ores and corrosive materials.
(3) Cost: In general, the basic wind pressure is 0.6kN/m2, the span is below 2m, and the cost of aluminum alloy stent is 1.3-1.5 times of steel structure stent. (Such as color steel roof) aluminum alloy bracket and steel structure bracket cost difference is relatively small, and in terms of weight aluminum alloy is much lighter than steel bracket, so it is very suitable for roof power station.
Post time: Feb-19-2025
