How to remove rust from a knife ?

Rust (metal oxidation) can appear on a knife over time, especially if it has been exposed to moisture or not properly maintained. Fortunately, there are several simple and effective ways to remove rust and restore the shine of your kitchen knives, table knives or folding knives.

Why does rust form on knives?

Rust forms when the iron contained in steel reacts with oxygen and moisture. Even stainless steels, although more resistant to corrosion, can develop small rust spots if they are not cared for properly.

Common causes include:

- Improper washing: leaving a knife wet or not drying it thoroughly encourages rust.

- Prolonged exposure to salt water: this accelerates corrosion.

- Scratches on the blade: wear marks can trap moisture, leading to rust.

Methods to remove rust from a knife

Here are several techniques you can use depending on the products and tools you have available.

Using white vinegar

White vinegar is a natural and effective product against rust.

How to use it:

- Submerge the blade in a container filled with white vinegar for 30 minutes to 1 hour.

- Remove the knife and scrub the blade with a soft sponge or non-abrasive brush.

- Rinse thoroughly with clean water and dry immediately.

Applying a baking soda paste

Baking soda works well on small rust spots.

How to use it:

- Mix baking soda with a little water to form a paste.

- Apply the paste to the rusty area and let it sit for about 15 minutes.

- Gently scrub with a toothbrush or cloth.

- Rinse and dry carefully.

Using a specialised metal cleaner

Commercial metal cleaners are designed to remove rust without damaging the blade.

How to use it:

- Apply the product to a soft cloth.

- Rub the blade in circular motions.

- Wipe with a damp cloth and dry immediately.

Lemon and salt

This natural method combines the acidity of lemon with the abrasive effect of salt.

How to use it:

- Sprinkle the blade with fine salt.

- Squeeze half a lemon over the rusty area.

- Leave to sit for 5 to 10 minutes.

- Rub gently with a sponge, rinse and dry.

Prevention and maintenance tips

To keep rust from returning, here are a few practical tips:

- Always dry your knives after washing. Even a few drops of water can cause rust if left to sit.

- Use a protective oil. A thin layer of food-safe oil on the blade prevents moisture from settling.

- Store knives in a dry place. Avoid damp drawers or areas close to the sink.

When should you consider replacing a knife?

If the rust is too deep and affects the knife’s performance or safety, it may be time to replace it. However, in most cases, regular care and good preventive habits can significantly extend the life of your knives.

With these methods and simple tips, your knives will regain their shine and performance, helping you continue the tradition of fine cutlery craftsmanship.