How to choose the anti-corrosion solution for photovoltaic brackets?

The photovoltaic bracket industry uniformly adopts ISO 12944 atmospheric cohesiveness classification (C1 – CX) as the grading basis, and then deducts the coating thickness and process according to the material (carbon steel/aluminum alloy/fastener). The selection logic is: first determine the level based on the on-site environment, and then match the anti-corrosion plan according to the material.

1,Why corrosion prevention is the 'invisible lifeline' of photovoltaic brackets

The photovoltaic bracket needs to support the photovoltaic modules outdoors for 25 years of operation. Its failure often does not result in a sudden collapse, but rather occurs quietly in places that no one looks at every day, such as fastener threads, cut end faces, and column bottom plates - until the bracket begins to shift and the components show hidden cracks, the operation and maintenance team will turn back to find the cause.

2, Choosing the wrong corrosion level comes at a double cost: if you choose it too low, it will rust through in five or ten years, and the replacement cost will be several times the original cost; Choosing too high, coastal standards are piling up on inland projects, eating up profits for nothing. Therefore, understanding the corrosion rating system is not a matter of process details, but rather a core technical capability directly related to project bidding pricing, customer trust, and long-term quality reputation.

3, Core System: ISO 12944 Classification of Atmospheric Corrosivity

The internationally recognized classification of atmospheric corrosiveness comes from ISO 12944-2, which divides the atmosphere into six levels based on the corrosion rate of metals in the environment. Photovoltaic bracket projects rarely encounter C1 (indoor), and actually deal with five levels from C2 to CX.

4,Anti corrosion grade of photovoltaic bracket (IS012944C-1-CX)