How can Bright Zinc plated Steel Shelves go rusty in a Fridge?

[Jimbob86]

Hi,

I have some Bright Zinc plated shelves which are currently being stored at 0-1'c. Over a period of 6 months they have become extremely rusty. How has this happened?

Please help...

 

[pallidin]

Good question, though I don't have an answer. I have seen the same type of shelves do this, with the zinc plating flaking-off.

My guess, is that there are different rates of expansion/contraction between the two metals, causing separation and cracks in the zinc plating, allowing moisture to enter and cause rusting.
But again, I don't know for sure.

 

[sir-pinski]

There are a few reasons why Bright Zinc plated steel shelves can go rusty in a fridge. First, it's important to understand that while zinc plating can provide some protection against rust, it is not a foolproof barrier. Over time, the zinc coating can wear off or become damaged, exposing the underlying steel to moisture and air, which can lead to rusting.

In a fridge, there are a few factors that can contribute to this process. One is condensation. Fridges are a humid environment, and when warm air from outside the fridge comes into contact with the cold metal shelves, it can cause condensation to form. This moisture can then seep into any small cracks or scratches in the zinc plating and reach the steel, leading to rust formation.

Another factor is the food being stored on the shelves. If the food is wet or contains high levels of acidity, it can also contribute to rust formation. The moisture from the food can react with the metal, and the acidity can accelerate the corrosion process.

Additionally, the constant opening and closing of the fridge door can also introduce warm, humid air into the fridge, creating a cycle of condensation and rust formation.

To prevent your Bright Zinc plated shelves from rusting in the fridge, it's important to regularly check and maintain the zinc plating. If you notice any scratches or damage, it's best to replace the shelves. You can also try wiping down the shelves regularly to remove any moisture or food residue that may contribute to rust formation. Finally, keeping the fridge door closed as much as possible can help reduce the amount of warm air entering the fridge and prevent condensation.