If elements of a clock have corroded, then the clock has been hung in a place where it has been able to absorb moisture. This could be moisture from an environment with high humidity such as a conservatory/summer room/greenhouse/shed/swimming pool/bathroom/above cooker or appliance/outdoors. In all of these cases, very high temperatures will then accelerate corrosion. Some will withstand moisture and heat better than others, it does depend on the materials used in any particular clock. Our clocks are warranted for domestic and light commercial indoor use only, and should not be used anywhere that they may be damaged by moisture/water/heat, such as conservatories/summer rooms/greenhouses/sheds/swimming pool/bathrooms/above cookers/outdoors. Damage caused by these environments/conditions are obviously not warranted, therefore no exchanges can be made under the warranty, nor can repairs be carried out as the corrosion from some parts have probably already affected and damaged others parts and materials.
Over exposure to sunlight could damage your clock in a number of ways, and different clocks made with different materials may react in different ways. Over exposure to sunlight is likely to occur if a clock is located by a window/conservatory/summer room/greenhouse/outdoors. This can cause damage such as the fading of clock the clock case, dial and hands.
Intense heat could damage your clock in a number of ways, and different clocks made with different materials may react in different ways. Intense heat or over exposure to sunlight from environments such as these may cause damage to your clock; sun through a window/conservatory/summer room/greenhouse/over a cooker/radiator/fire/wood burner. Intense heat can cause clocks/cases/parts to melt/contract/warp/discolour and can cause clocks to stop or push interference fit hands to come loose.