Recently, many hardware processing customers have reached out to us regarding 201 stainless steel, which is known for being prone to rusting. The cleaning process has become a major challenge, and they are seeking on-site technical support. Our company has been dedicated to researching precision cleaning technologies for hardware for several years, and dealing with such issues is a common part of our work.
Why does 201 stainless steel tend to rust after cleaning? And why do some parts show rust while others don’t? Let’s explore this in detail.
Firstly, 201 stainless steel is technically not a true stainless steel but more like stainless iron. Its chemical composition differs significantly from that of standard stainless steels like 301 or 304, particularly in terms of chromium content, which is much lower. Stainless steel relies on a thin, strong chromium-rich oxide layer to protect it from oxidation. However, the protective layer on 201 stainless steel is weaker. If this layer is damaged, the underlying metal can react with oxygen, leading to rust formation.
Secondly, some 201 stainless steel parts may not show signs of rust immediately after cleaning but develop it over time. This often happens during the rinsing stage. Many manufacturers focus only on removing visible oil and perform just one or two rinses. If the surface appears clean to the naked eye, they consider the job done. However, this is not sufficient. Most stainless steel cleaners are alkaline, and if the rinse is incomplete, residual alkaline substances can remain on the surface. These residues can eventually damage the protective film, causing rust to appear after a few days.
Thirdly, if the cleaning agent contains acidic components, it could directly damage the protective layer, leading to uneven or broken areas. This can result in rust appearing either as a full sheet, in patches, or even temporarily.
Fourthly, even with neutral cleaning agents, improper rinsing can lead to residue buildup. Water-based cleaners often contain organic compounds that can attract moisture from the air. These residues can create a galvanic cell environment, promoting electrochemical corrosion and ultimately causing rust.
So, what kind of cleaning agent should you use? How should the cleaning process be carried out? Let’s take Changlufeng Chemical as an example.
We recommend avoiding strongly acidic cleaning agents, as they are the most harmful to 201 stainless steel. Alkaline cleaners can be used, but thorough rinsing is essential to remove any remaining residue. Neutral cleaners are also a good option, as they don’t harm the material directly, but again, proper rinsing is crucial.
In summary, both alkaline and neutral cleaning agents can be suitable, but the key lies in ensuring a thorough rinsing process. Ideally, the rinsing should be done at least three times, and if possible, heated water can be used for better results.
Finally, drying the cleaned parts thoroughly is essential to prevent rust. A dry surface is the best defense against corrosion.
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Edited by Hardware Business Network Information Center.
Edited by Hardware Business Network Information Center.Electric Butterfly Valve,Waterproof Butterfly Valve,Turbine Butterfly Valve,Three Eccentric Butterfly Valve
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