Rust Inside Microwave: Causes, Fixes, and Prevention Tips

Since the interior of most microwaves is made of metal, rusting can sometimes become an issue. Rust inside a microwave, especially when left untreated, can pose a health and safety risk and may damage your appliance to the point where replacement becomes necessary.

This article explains why rust forms inside a microwave, the potential hazards it presents, and how to fix and prevent it from occurring again.

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Why Rust Forms Inside a Microwave

The inner cavity of a microwave is usually coated with microwave-safe paint that protects the metal from rusting. However, when this protective layer gets cracked, chipped, or worn down, it exposes the metal underneath to moisture and oxygen, leading to rust formation.

Several factors can contribute to the deterioration of this protective coating and the development of rust:

• Age: Over time, normal wear and tear make older microwaves more susceptible to rust.

• Harsh Cleaning Methods: Using abrasive materials or strong chemicals to scrub the microwave interior can damage the protective coating.

• Lack of Cleaning: Food spills left uncleaned can be corrosive, particularly if they contain acidic ingredients that eat away at the interior coating.

• Moisture Buildup: If a microwave has blocked vents or isn’t dried properly after cleaning or use, trapped moisture can accelerate rusting.

Why a Rusty Microwave Interior Can Be Hazardous

A small amount of rust inside a microwave may not cause immediate harm if addressed promptly. However, if left unchecked, rust can compromise the microwave’s internal structure. While the risk is minimal, prolonged rusting can potentially lead to minor radiation leakage during operation.

Additionally, extensive rust damage can make repairs impossible, leaving you with no choice but to replace the appliance. Once rust causes holes in the metal, even small ones, the microwave is no longer safe for use.

Another concern is food contamination. Rust particles or flakes from the microwave’s paint may fall into your food, posing a health risk. Furthermore, rust buildup can interfere with the microwave’s ability to heat food evenly and may even affect internal components, leading to potential electrical hazards.

How to Remove Rust from Inside Your Microwave

If the rust is only on the surface, you may be able to restore your microwave by following these steps:

1. Unplug the microwave for safety.

2. Remove the turntable and clean it separately.

3. Clean the interior using a baking soda and water paste with a cloth or sponge to scrub away dirt and grime.

4. Wipe down the interior with a mixture of white vinegar and water or dish soap.

5. Dry the microwave thoroughly with kitchen towels to remove any remaining moisture.

6. Sand down the rusted areas using fine-grit sandpaper until the surface is smooth and all rust is removed.

7. Clean away any dust from sanding and ensure the interior is completely dry.

8. Tape off areas that don’t need painting and cover the vents.

9. Apply a microwave-safe cavity paint to the sanded areas following the manufacturer’s instructions. Do not use regular paint, as it may be unsafe.

10. Allow the paint to dry fully before using the microwave again (typically 24 to 72 hours).

How to Prevent Rust from Occurring

Now that you understand why rust forms inside a microwave and how to remove it, here are some useful prevention tips:

• Clean your microwave regularly using a soft cloth and mild dish soap. Avoid harsh chemicals and abrasive scrubbing tools.

• Cover food while microwaving to prevent splattering onto the cavity walls.

• Wipe up food spills immediately to prevent acidic corrosion.

• Avoid using metal utensils that could scratch the cavity paint.

• Dry the microwave thoroughly after use or cleaning to prevent moisture buildup.

• Remove and clean the turntable separately, ensuring it is fully dry before placing it back inside.

• Regularly inspect your microwave’s interior and touch up any paint chips as soon as they appear.

Summary

Rust inside a microwave is an issue that should be addressed as soon as it’s noticed. If left untreated, it can worsen over time, affecting both the functionality and safety of the appliance.

For some, repairing a rusty microwave may seem too time-consuming, making replacement the easier option. However, for DIY enthusiasts, removing rust and repainting the interior can be a rewarding fix.

Ultimately, the best way to deal with rust inside a microwave is through prevention. Regular maintenance and careful cleaning habits can help keep your microwave rust-free and prolong its lifespan.

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If your microwave has developed rust and you're unsure how to fix it, let the experts handle it! At RightFix, we specialize in diagnosing and repairing microwaves to ensure they are safe and functional. Whether you need rust removal, cavity paint touch-ups, or general repairs, our skilled technicians are here to help. Contact RightFix today for reliable and professional microwave repair services!

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