For stainless steel, it is generally considered to be a steel that is not easy to rust, but in fact stainless steel can also rust. The rust and corrosion resistance of stainless steel is due to the formation of a chromium-rich oxide film (passivation film) on its surface. This rust resistance and corrosion resistance are relative.
Tests show that the corrosion resistance of steel in weak media such as air and water and in oxidizing media such as nitric acid increases with the increase of chromium content in steel. When the chromium content reaches a certain percentage, the corrosion resistance of steel changes abruptly. , that is, from easy to rust to not easy to rust, and from corrosion-resistant to corrosion-resistant.
To test whether the stainless steel valve can rust, the same valve can be placed in different environments for verification and comparison.
Under normal circumstances, if the stainless steel valve is placed in a relatively dry environment, after a long time, the valve is not only in good condition, but also free of rust.
And if the valve is placed in seawater with a lot of salt, it will rust within a few days. Therefore, the corrosion resistance and stainless steel properties of stainless steel valves also need to be measured according to the environment.
"From the characteristics of the stainless steel valve itself, the reason why it is stainless is that there is a layer of chromium-rich oxide film on its surface to prevent the external oxygen atoms and other particles from causing damage to the object, so that the valve has the characteristics of stainless steel." Expert However, when the membrane is damaged by factors such as the environment, it will rust with the entry of oxygen atoms and dissociate from iron ions.
There are many reasons for the rusting of stainless steel valves, such as the electrochemical reaction between the membrane and other metal element particles or dust, and the use of humid air as a medium to form a micro-battery cycle, which makes the stainless steel surface rust.
Another example is that the stainless steel surface film directly comes into contact with corrosive liquids such as strong acids and alkalis, causing corrosion and so on. Therefore, in order for the stainless steel valve to not rust, it is necessary to pay attention to the cleaning of the objects in daily use and keep the surface of the valve clean.
So, if the stainless steel valve is rusted, how can the user solve this problem?
First, it is necessary to clean and scrub the surface of the stainless steel valve frequently to remove attachments and eliminate external factors that cause rust.
Second, 316 stainless steel should be used in seaside areas, because 316 material can resist the corrosion of seawater.
Third, the chemical composition of some stainless steel pipes on the market does not meet the corresponding national standards and does not meet the material requirements of 304, so it will also cause rust. In this regard, technicians said that when users choose stainless steel valves, they must carefully choose products from reputable manufacturers. Bund stainless steel valve, excellent material, good quality, is your trusted choice~
There are only a few cases of stainless steel valves rusting. Usually, safety valves made of stainless steel are relatively safe and unmatched by other materials. Therefore, the valve of this material is very common in the environment of some dangerous media, and it is also the key to ensure its performance.
In addition, stainless steel valves are often in contact with some liquid media, and the environment is often wet, and the anti-rust advantage of this type of valve has become a major advantage, and makes this type of valve more durable. The service life is greatly extended, and the undue influence of possible rusting problems is eliminated.
Post time: Jul-11-2022