Stainless steel is widely known for its corrosion resistance quality, but in some cases its not fully impervious to rust. If the conditions fall under the mishandling criteria, stainless steel alloys can corrode too.
So the question is "What corrodes stainless steel?" What are those reasons where Stainless steel fails ? in today's blog we will be giving a quick explanation on stainless steel corrosion if not handled properly.
1. Pitting corrosion formation on Stainless steel due to strong chlorides.
Strong chlorides could cause a serious pitting corrosion on few of the stainless steel alloys such as SS304 or below grades. Chlorides (Salt) are present in environments such as usage of SS304 in naval applications as sea water is full of high chlorides (Salt). So Its always recommended to choose those stainless steel alloys which are resistant to strong chlorides.
Localized Pitting Corrosion of Superduplex Stainless Steel in a Seawater Application, The corrosion and holes observed in the column. Source: Paper SPE 189091*
2. Corrosion in Stainless steel alloy due to bimetallic and galvanic reactions.
Welding of two dissimilar metals together could lead to such type of galvanic reactions and corrosion which is one of a very basic mistakes a manufacturer can do while manufacturing a custom steel final product. It could be because of the mistake or as per design.
Different metals and corrosion due to its reaction.
The best method to prevent for bimetallic corrosion is first to avoid joining or welding two dissimilar metals. Along with this using a weld filler rod which is not similar to the metals being welded can also cause galvanic corrosion.
3. Putting a raw iron or steel piece on stainless steel for a long time.
It can be notices, if a raw piece of iron or steel is transplanted for a log time on stainless steel it can transfer its particulate residue from one to another. Once these particles settled on the stainless steel surface it can disrupt the protective oxide layer and stainless steel could lead to rust. This type of occurrence is purely accidental and case of mishandling and typically without the manufacturer’s knowledge.
Its always recommended to use same metal for transplanting stainless steel. Few equipment, like steel brushes, should never be used or shared between different types of metal.
4. Despite of having high melting point of Stainless steel extreme temperature could lead to rust.
However stainless steel have a very high melting point (1,200 F), but temperature could also be a reason of corrosion in certain cases, in high temperature applications scaling is very common in stainless steel, during this whole process of heat treatment when scales form on hot metal the leftover material can cause bimetallic corrosion due to its different properties.
5. Harsh environmental conditions can cause rust on Stainless steel.
Salt in air or also called moist air could also lead to corrosion on stainless steel, coastal areas or industrial areas where fumes of bleach and salt is present in the air it become very difficult to save stainless steel by being corroded.
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