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How Much Dose The Thickness Of Hot Dip Galvanized For The Solar Racking Systems Need To Up So That Can Meet 25 Years Service Life.
Feb 10, 2018

How much dose the thickness of hot dip galvanized for the solar racking systems need to up so that can meet 25 years service life.


The problem of hot-dip galvanizing is an important quality and technical indicator of the photovoltaic support, which relates to the safety and durability of the structure. Although there are national and industry specifications, but the stent is not the thickness of hot-dip galvanized stent is still a more common technical problems, talk about "thick" color change still exists.


Photovoltaic stent is generally carbon steel and aluminum alloy two, and the use of hot-dip galvanized carbon steel, carbon steel is generally Q235 and Q345, the use of steel sheet after cold bending, welding, hot-dip galvanizing and other processing Into a stent. The thickness of the bracket is generally more than 2mm (for some seaside, high-rise and other windy areas and regions, it is recommended that the thickness should not be less than 2.5mm, otherwise the risk of tearing steel connection point).


Hot-dip galvanizing process is a more stable and reliable steel surface treatment program to resist the corrosion of the environment. There are many factors affecting hot-dip galvanizing such as steel substrate composition, surface state (such as roughness), stress in substrate, geometry Size, etc., of which the thickness of the substrate thickness of hot-dip galvanized greater impact on the general thickness of the hot-dip galvanized sheet also greater. The following 2.0mm thickness of the stent as an example to illustrate how much the thickness of galvanized layer to meet the requirements of environmental corrosion life.


In accordance with the requirements of the national standard, for 2mm substrate, the local thickness should not be less than 45μm, the average thickness of not less than 55μm. According to the Japan Galvanizing Association based on the results of the atmospheric exposure test from 1964 to 1974.


If calculated in accordance with the national standard, the average thickness of 55μm, the amount of zinc attached to 55x7.2 = 396g / m2, four different environments can be used for service life:


Heavy industrial zone: 8.91 years, the annual corrosion rate of 40.1;


Coastal zone: 32.67 years, the annual corrosion rate of 10.8;


Outskirts of the country: 66. 33 years, the annual corrosion rate of 5.4;


Urban zone: 20.79 years, the annual corrosion rate is 17.5;


If calculated according to the service life of photovoltaic 25 years, then the four zones followed by at least: 1002.5, 270, 135, 437.5, namely 139μm, 37.5μm, 18.75μm, 60.76μm, so for the urban area distributed, it is reasonable and necessary to set the thickness of the galvanized layer at least 65μm, but for heavy industrial areas, especially industrial areas with acid-base corrosion, it is recommended to increase the thickness of the stent, zinc coating Thickness should also be increased appropriately.


Most importantly, we CY Solar's thickness of hot dip galvanized reach up to 80μm. So just pls believe in us and give a chance to cooperate between you and me!


                                                          ---- From CY Solar. Vicky