The CorrosionProcess of Corten Steel

Weathering steel is renowned for its unique rusted appearance and is highly favored in landscape design. But how exactly does this distinctive rust layer form on this steel? Let's explore the fascinating rusting process of weathering steel, from the initial signs of oxidation to how it maintains its beautiful appearance. Curious? Then read on!

Summary

• The rusting process of weathering steel begins within the first two months and can take one to two years.
• Weathering steel rusts fastest in warm, humid climates.
• The rusting process is slowed when weathering steel is covered with grass, plants, or mulch.
• Using rust removers can accelerate the rusting process.
• The use of varnishes, paints, chemicals, or coatings is not recommended.

What is the rusting process of weathering steel?

The rusting process of Corton steel is caused by a unique chemical reaction between metals such as iron, copper, chromium, nickel, and phosphorus and environmental factors such as moisture and oxygen.

This reaction, also known as oxidation, forms a protective rust layer . This rust layer not only prevents further corrosion but also gives the material an aesthetically pleasing appearance due to its distinctive rust color. This natural process only takes some time.

Weathering steel is rust-free when it leaves the factory. The desired rust layer will form after a few months (the exact time depends on the weather conditions).

How long does it take for weathering steel to rust?

Initial rust appears quickly, usually within days or weeks. This depends on ambient humidity and temperature. The entire rusting process typically takes 1 to 2 years . The rate at which weathering steel rusts depends on the following factors:

• Humidity and precipitation
• Temperature and temperature fluctuations

Climate influence

The corrosion process of weathering steel is affected by a variety of factors, among which humidity and temperature play a crucial role.

The rusting process works best in environments with mild climates, moderate humidity , but sufficient moisture to initiate the process and promote rust formation.

Temperature fluctuations can also affect the rusting process. For example, rust forms faster in the more humid Netherlands than in southern France.

The following factors can affect the rusting process of weathering steel: humidity, precipitation and dryness, temperature fluctuations, and the salt content in the air.

The role of humidity and precipitation

Humidity and rainfall play a crucial role in the corrosion process of weathering steel. In humid and rainy environments , weathering steel reacts with oxygen to form a protective rust layer. However, in dry climates or other environments lacking moisture, the formation of this rust layer may take longer.

Indoor

You can place weathering steel products indoors, but it's best to leave them outdoors for a year first to allow them to fully rust. Once the rusting is complete and the material no longer rusts, you can safely place them indoors for use.

Is spraying water on weathering steel effective?

Spraying water on weathering steel flowerpots is beneficial in dry weather conditions . The purpose of spraying water is simply to promote the rusting process. Weathering steel will not rust in excessively dry environments.