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How to Prevent Stainless Steel Corrosion and Rust

2022-04-01 Page view : 10 views

What is Stainless Steel?

Stainless acid-resistant steel, usually shorting for stainless steel, refers to the steel with at least 10.5% of chromium and no more than 1.2% carbon. So called stainless steel can be divided into two different types: one is stainless steel that are resistant to weak corrosion media such as air, steam, water and more; the other is acid-resistant steel, which are resistant to chemically corrosive media like acids, alkalis or salts.

 

However, due to their differences of chemical compositions, the corrosion resistance and anti-rust features are distinguished obviously. For example, the normal stainless steel will face the problem of rust and corrosion when being exposed to chemical substances. As we all know, the stainless steel has excellent weldability, corrosion resistance, polish ability and heat resistance, widely being used in all kinds of industries. But is it true that the stainless steel will never rust or corrode? The answer is, definitely, no. Under certain conditions, truly speaking, the stainless steel will be corroded and rust.

 

Main Types of Stainless-Steel Corrosion

So, you may be curious about how the stainless-steel rust and corrode. And here we will introduce a few types of stainless-steel corrosion. The most common corrosion of stainless steel is local corrosion, mainly including stress corrosion, pitting corrosion, crevice corrosion, intergranular corrosion and corrosion fatigue.

 

Stress corrosion, also known as stress corrosion cracking, is a type of corrosion that occurs due to the simultaneous action of a corrodent and a sustained tensile stress. Pitting is a type of corrosion that occurs in materials that have protective films. It is an attack with localized holes on the metal’s surface. The attack can penetrate the metal very rapidly, while some parts of the metal surface remain free from corrosion. Crevice corrosion refers to the attack of metal surfaces by a stagnant solution in crevices. Intergranular corrosion can be defined as an attack along the boundaries of several grains in the metal or near the grain boundary with the largest portion of the grain remaining unaffected. It is a corrosion type that attacks the boundaries of the metal crystallites. Fatigue corrosion is corrosion caused by fatigue of materials. It refers to the fatigue fracture of a metal aggravated by a corrosive environment or stress corrosion cracking of a metal aggravated by cyclic stress.

 

Tips for Stainless Steel’s Protection

All the time, rust and corrosion are big issues, which will ruin the stability and functionality of your important machinery, bringing great loss to your stainless-steel business. Therefore, knowing how to prevent and deal with rust and corrosion seems important to you.

 

Firstly, keep the stainless-steel dry. It sounds like an easy and effortless method. We know that mental will develop rust and corrosion gradually when being exposed to humid environment. So, you should frequently wipe the stainless steel’s surface to keep it dry and monitor the humidity of its storage environment. Besides, coat the metal’s surface with a thin layer of chromium–an element that is highly resistant to moisture. By passivating the metal’s surface to form a protective coating, which effectively separates the metal from other corrosive media completely.

 

Stainless steel plays a very important role in various fields and is superior to other plain metals due to its excellent anti-rust and anti-corrosion features. As with many things, know more about the stainless steel and ways to protect it well can save you from such uncalled hassles in rust and corrosion.