What are the disadvantages of galvanisation?

Galvanisation can lead to issues such as the potential for zinc corrosion over time, especially in harsh environments, which may compromise the protection it offers. Additionally, the process can be expensive and may not be suitable for intricate shapes or items with complex geometries, as it can lead to uneven coating. Furthermore, the thermal expansion of zinc can cause stress in certain materials, potentially leading to cracking or failure. Lastly, if damaged, galvanised surfaces can corrode more quickly than untreated metals.