Research on corrosion mechanism and anti-corrosion of spiral ground piles in photovoltaic power stations

As the basic structure of the ground photovoltaic power station support system, spiral ground piles play a vital connecting and supporting role. The material of the pile body is made of Q235 series ordinary carbon steel. Since spiral ground piles are most susceptible to corrosion when exposed to a dark and humid underground environment for a long time, it will not only cause instability or collapse of some power station support systems, but may even affect the service life of the entire photovoltaic power station. Therefore, the corrosion problem of spiral ground piles must be taken seriously treat. Research shows that hot-dip galvanizing can effectively prevent corrosion.

The thickness of the zinc layer, a key indicator of the corrosion resistance of hot-dip galvanizing, is generally considered to be directly proportional to the relationship. The thickness of spiral ground piles is generally 3-4mm. National regulations require a minimum average thickness of 70μm. The thickness of spiral ground piles required by the factory is generally greater than 80μm, which can guarantee a service life of at least 25 years.

In addition, the local geology and meteorological reports should be analyzed before the spiral pile foundation is selected. The ground mat should be laid away from or avoid highly corrosive and heavily polluted places. This can reduce the corrosion rate of the zinc layer on the one hand, and on the other hand, it can reduce the corrosion rate of the zinc layer. On the one hand, it can avoid chemical corrosion of the pile body, because SO2, CI- and other substances in the polluted air will aggravate the corrosion rate of zinc. Try to avoid weathered stone and gravel areas with strong air permeability to reduce the oxygen permeability.