How to Prevent Stainless Steel from Rusting It can happen between two metals or a metal and a non-metal. Crevice corrosion – also localised corrosion that occurs at the crevice between two joining surfaces.It’s prevalent in environments containing chlorides. Pitting corrosion – it’s a localised type of corrosion which leaves cavities or holes.It refers to a situation where one metal comes into contact with another and causes one or both to react with each other and corrode. Galvanic Corrosion – this type of corrosion affects most metal alloys.It’s characterised by a uniform loss of the entire surface. General corrosion – it’s the most predictable and easiest to handle.Each of them presents different challenges and requires different handling. There are different types of stainless steel corrosion. This layer can be destroyed by harsh environments or mechanical damage such as scratches however, if cleaned properly and in a suitable environment, the protective layer will form again restoring the protective properties. Although very thin, this layer is what protects the metal from corrosion. The chromium in stainless steel reacts with oxygen in the air to produce a protective chromium oxide layer across the surface. Also, environments with salty water can accelerate corrosion on stainless steel.įinally, maintenance will have an effect on the metals ability to resist rust. Environments with chlorine like swimming pools are highly corrosive. The environment where the metal is used is another factor that can amplify the chances of stainless steel rusting. The elements in the different grades of stainless steel can have adverse effects on corrosion resistance. The composition of the steel is the single biggest concern when it comes to corrosion resistance. Various factors can affect the ability of stainless steel to resist corrosion. Factors Affecting Rust on Stainless Steel The higher the chromium content, the less likely the metal will rust.īut, over time and if not maintained correctly, rust can and will develop on stainless steel. Some types of stainless steel are more prone to corrosion than others, depending on the chromium content. At the moment, there are over 150 varieties of stainless steel in the market.īecause of its low maintenance nature, resistance to oxidation and staining, stainless steel is preferred in many applications, particularly those where aesthetics matter.Įven with these impressive features, stainless steel can and does rust after all, it’s 'stainless' not 'stainfree'. The chromium reacts with the oxygen in the air and forms a protective layer that makes stainless steel highly resistant to corrosion and rust. Stainless steel is a steel alloy that contains a minimum chromium content of 10.5%.
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