As we all know, the quality of photovoltaic stents and installation methods directly affect the benefits of photovoltaic power plants.
With regard to the importance of the stent in the photovoltaic system, the photovoltaic headliner has been specially planned as follows. Many volts require the introduction of “galvanized stentsâ€. Today, photovoltaic headlines are just saying that the stent is galvanized!
At present, the stent material on the market is generally based on carbon steel and aluminum alloy. The material of carbon steel is generally Q235 and Q345, using hot-dip galvanizing treatment. The strip coils are processed into brackets by cold bending, welding, hot-dip galvanizing and other techniques. The thickness should generally be greater than 2mm, and especially for some large areas such as the seaside, high-level areas and areas, the recommended thickness should not be less than 2.5mm, otherwise the connection point of the steel has the risk of tearing.
In our life, for the carbon steel PV bracket, what is the thickness of the galvanized layer to meet the environmental corrosion service life requirements?
We all know that the thickness of hot-dip galvanizing is an important quality and technical indicator of photovoltaic support, which is related to the safety and durability of the use of the structure. Although there are national and industry standards, the lack of standard galvanized layer thickness is still a relatively common technical problem.
The hot-dip galvanizing process is a relatively stable and reliable steel surface treatment solution against environmental corrosion. There are many factors affecting hot galvanizing, such as: steel substrate composition, surface condition (such as roughness), substrate internal stress, geometry The size, etc., of which the thickness of the substrate has a great influence on the thickness of the hot-dip galvanizing, the thicker the hot-dip galvanized thickness of the plate is. The following uses a 2.0 mm thick bracket as an example to illustrate how much the galvanized layer thickness needs to meet the environmental corrosion service life requirements.
Assume that the thickness of the stent substrate is 2mm, which is known from the specifications of GBT13192-2002 hot galvanizing specification.
According to the requirements of national standards, for a 2 mm substrate, the local thickness should not be less than 45 μm, and the average thickness should not be less than 55 μm. According to the results of the atmospheric exposure test conducted by the Japan Hot-dip Galvanizing Association from 1964 to 1974.
If calculated according to the national standard, the average thickness is 55μm, the amount of zinc attached is 55x7.2=396g/m2, and the useful life in four different environments is approximately:
Heavy industry zone: 8.91 year, the annual corrosion degree is 40.1;
Coastal area: 32.67 years, the annual degree of corrosion is 10.8;
Outskirts: 66.33 years, the annual corrosion degree is 5.4;
Urban area: 20.79 years, the annual degree of corrosion is 17.5;
If calculated according to the service life of PV for 25 years, the four zones in turn are at least:
1002.5, 270, 135, 437.5, ie 139 μm, 37.5 μm, 18.75 μm, 60.76 μm. Therefore, for the urban urban area distribution, it is reasonable and necessary to set the thickness of the galvanized layer to at least 65 μm. However, for heavy industrial zones, especially in the industrial zone with acid and alkali corrosion, the thickness of the bracket is recommended. With appropriate increase, the thickness of the galvanized layer should also be increased appropriately.
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