Does Stainless Steel Tarnish?

Stainless steel is popularly recognized for its rust and corrosion-resistant qualities due to the chromium in its composition. Depending on its chromium content, stainless steel should not tarnish at all, but that doesn’t mean certain types of stainless steel won’t tarnish eventually. Don’t worry! Your stainless steel kitchen appliances, wine barrels, drums, and IBC totes can avoid tarnishing with simple cleaning routines and proper conditions. Explore everything you need to know about keeping your stainless steel tarnish-free in this article!

stainless steel IBC tote and bucket of tarnish remover

What Happens When Stainless Steel Tarnishes?

Stainless steel is primarily made up of iron, carbon, and at least 10.5% chromium. Chromium creates a thin shield of chromium oxide which protects the outer layers of stainless steel from corrosion. When stainless steel tarnishes, it is because this protective layer has been affected.

Tarnish, like rust, is a form of corrosion that takes place on the outermost layers of certain metals. Unlike rust, tarnish only affects the thin top layers of metal, preserving the layers beneath it.

Signs of Tarnishing

Tarnish is identified as a dullness or loss of luster. Tarnished metal begins to darken, going through phases of discoloration before turning black/gray. It may appear patchy or exhibit an unpleasant smell. The film that forms with tarnish is often described as a patina and sought out in antiques or for aesthetic value.

Why Does Stainless Steel Tarnish?

If chromium protects the outer layers of stainless steel, then why does stainless steel tarnish? Stainless steel is an umbrella term used for several types and grades of stainless steel whose tarnish-resistance may vary. Higher grades tend to be more resistant to tarnishing. Additionally, the stainless steel's composition may contain other metals or have different amounts of chromium, making it more prone to corrosive reactions.

Chromium slows down tarnishing in stainless steel with its protective shield, but this layer can be broken down by repeated exposure to elements in the environment.

Wear-&-Tear

Surface damage and scratches can break the chromium oxide layer on stainless steel and allow oxygen to enter. This damage can be obtained by machinery and rough handling.

Dirt & Acid

Dirt and acids can begin to chemically corrode stainless steel’s protective later.

Air

Exposure to oxygen can lead to oxidation, which discolors the metal. Stainless steel may turn green if it contains copper, silver, gold, or palladium and undergoes oxidation.

Harsh Chemicals

Harsh chemicals, such as bleach and ammonia, and their application can damage the surface of stainless steel and corrode the protective oxide layer.

Skin Contact

The oils and acids in our skin as well as sweat can cause tarnishing over time.

Water & Humidity

Water, especially saltwater, mineral water, and any water with impurities, can cause certain grades of stainless steel to corrode over time.

Wear-&-Tear

Surface damage and scratches can break the chromium oxide layer on stainless steel and allow oxygen to enter. This damage can be obtained by machinery and rough handling.

Dirt & Acid

Dirt and acids can begin to chemically corrode stainless steel’s protective later.

Air

Exposure to oxygen can lead to oxidation, which discolors the metal. Stainless steel may turn green if it contains copper, silver, gold, or palladium and undergoes oxidation.

Harsh Chemicals

Harsh chemicals, such as bleach and ammonia, and their application can damage the surface of stainless steel and corrode the protective oxide layer.

Skin Contact

The oils and acids in our skin as well as sweat can cause tarnishing over time.

Water & Humidity

Water, especially saltwater, mineral water, and any water with impurities, can cause certain grades of stainless steel to corrode over time.

Why Preventing Stainless Steel Tarnish Matters

Stainless steel is a commonly encountered metal, used in everyday items such as kitchenware, cooking appliances, utensils, and jewelry. It is also a critical material used in civil engineering, land and marine industrial environments, as well as chemical and medical industries.

The corrosion-resistant properties of stainless steel make it a popular option across applications, but it’s important to note that not all stainless steel shares the same properties. Two common grades are 304 stainless steel (common in food and culinary industries) and 316 stainless steel (highly-resistant to chlorides and corrosives). If you are unsure about the grade or composition of your stainless steel, following a basic cleaning routine can help prevent and fight tarnish in the future.

How to Avoid Tarnish on Stainless Steel

Caring for your stainless steel will help preserve its protective layer and keep it corrosion-resistant for a long time! Most stainless steel care involves simple maintenance, such as:

Cleaning Regularly. Use a soft cloth or sponge and mild detergent to clean your stainless steel. Unless the item is used for hygienic or similar purposes, you can clean stainless steel between one to four times a year.
- Avoid Harsh Cleaners. If you wish to use a chemical cleaner, make sure it is intended for use with stainless steel.
- Avoid Abrasive Sponges. This can damage the metal’s surface.
- Wash with the Grain. When cleaning large stainless steel appliances, look for the lines in your stainless steel surface. Following the direction of the grain leads to a more complete clean and limits chances of scratching.
Drying Thoroughly. This prevents water spots and limits exposure to unwanted moisture.
Using a Protective Coating. If you wish to take additional measures to protect your stainless steel, apply commercial coating or sealant created specifically for stainless steel. The coating will prevent reactive molecules and oxygen from reaching the surface of your stainless steel.

How to Remove Tarnish from Stainless Steel

Is your stainless steel tarnished? There are several simple home remedies and commercial cleaners that will remove tarnish from stainless steel! Remember to resume proper care after tarnish removal to avoid future tarnishing.

Tarnish Cleaner

Commercial tarnish cleaner removes tarnish quickly and effortlessly. Make sure to use products that are specifically manufactured to remove tarnish from stainless steel surfaces.

Home Remedies for Tarnish

Stainless steel can also be restored using cost-effective, home remedies. In the solutions below, mix the ingredients (where applicable) into a paste and apply as needed. You can also let the substance sit and remove over time. Remember to use a soft cloth, rinse, and pat dry.

Vinegar and Baking Soda
Salt and Lemon Juice
Salt, Plain Flour, and White Vinegar
Olive Oil
Dish Soap
Toothpaste (free of whitening ingredients)

Some experts claim gently rubbing steel wool or sandpaper will help remove tarnish while doing minimal damage to the metal’s surface. When cleaning stainless steel jewelry, a soft-bristled toothbrush can also be used.

Why Choose The Cary Company?

At The Cary Company, we recognize the importance of quality, dependable containers and packaging that leave you feeling confident in your purchase. Apart from answering questions such as “Does stainless steel tarnish?”, we take pride in our bulk distribution and excellent customer service.

Enjoy the corrosion-resistance and versatility of stainless steel at great prices, shipped your way by our proactive logistics team. Whether you're looking for drums and IBC totes, filter vessels and air filters, pumps and mixers, or valves and parts washers, we have the stainless steel solutions for you. Just give us a call at 630.629.6600 or email us at sales@thecarycompany.com!