Cause of metal deterioration in heating element coil

In summary, after being out of service for a decade, a tumble dryer that had only been used a few times was put back into operation. However, the heating failed shortly after being switched on, and upon inspection, it was discovered that the heating element was broken in multiple places. The cause of this deterioration is believed to be metal fatigue, which can occur over time or through exposure to cold temperatures or vibrations. The dryer was not transported or stored near a source of vibration during the 10-year period it was out of service.
  • #1
Merlion
9
1
I put a tumble dryer that had been used only a few times back in operation after a decade being completely out of service. Heating failed shortly after switching on. Checked the heating element and noticed that it is broken at a dozen locations. The spiral is very brittle and breaks easily when I touch it, even in a cold state.

This is obviously some sort of chemical deterioration proces that has taken place. What causes this deterioration?
 
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  • #2
It sounds more like metal fatigue. A filament may be annealed when heated and cooled, but time, cold or vibration may change the state of the metal to make it more brittle.
Was the drier transported, a long time after it was last heated ?
Was the drier stored near a source of vibration during those 10 years ?
 
  • #3
No the dryer was at the same location (store room inside house, region of moderate climate, room occasionally heated during winter) fully static, during this 10-year period.
 

1. What causes metal deterioration in heating element coils?

Metal deterioration in heating element coils is primarily caused by two main factors: oxidation and corrosion. Oxidation occurs when the metal is exposed to oxygen and forms a layer of oxide on its surface, which can weaken and degrade the metal. Corrosion, on the other hand, is a chemical process that occurs when the metal reacts with other substances in its environment, causing it to break down and deteriorate over time.

2. How does oxidation contribute to metal deterioration in heating element coils?

Oxidation is a major contributor to metal deterioration in heating element coils. When the metal is exposed to oxygen, it forms a layer of oxide on its surface, which can weaken and degrade the metal. This process is accelerated when the metal is exposed to high temperatures, such as in a heating element coil, as it speeds up the chemical reaction between the metal and oxygen.

3. What are the effects of corrosion on heating element coils?

Corrosion can have a significant impact on heating element coils. It can weaken and thin out the metal, making it more susceptible to breakage and failure. Corrosion can also cause pitting, where small holes or craters form on the surface of the metal, further weakening it. In extreme cases, corrosion can completely destroy the heating element coil, rendering it unusable.

4. Can the type of metal used in heating element coils affect its deterioration?

Yes, the type of metal used in heating element coils can greatly affect its deterioration. Some metals, such as stainless steel and nickel, are more resistant to oxidation and corrosion, making them a better choice for heating element coils. However, other factors such as the quality of the metal and the environment in which it is used can also play a role in its deterioration.

5. How can metal deterioration in heating element coils be prevented?

To prevent metal deterioration in heating element coils, proper maintenance and care is essential. This includes regular cleaning and removal of any buildup or debris on the coils, as well as ensuring that the metal is not exposed to harsh chemicals or extreme temperatures. Using high-quality metals and protective coatings can also help prevent deterioration. Additionally, promptly addressing any signs of deterioration, such as corrosion or pitting, can help prolong the lifespan of the heating element coil.

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