JNS-017 stainless steel Sensor Housing

How is the corrosion resistance of the 304 stainless steel sensor housing achieved?
The corrosion resistance of the 304 stainless steel sensor housing is a key feature for its wide application in various harsh environments. This excellent corrosion resistance is mainly due to its unique chemical composition and fine surface treatment process.

The chromium content in 304 stainless steel is as high as 18% to 20%, which gives it excellent oxidation resistance. When 304 stainless steel is exposed to the air, chromium reacts with oxygen and quickly forms a thin and tough chromium oxide film. This film tightly adheres to the surface of the stainless steel, effectively isolating the stainless steel from corrosive media in the external environment, such as oxygen, water and various chemicals. This naturally occurring protective layer not only prevents further oxidation reactions, but also reduces metal loss due to corrosion. In addition to chromium, nickel also plays a vital role in the manufacture of 304 stainless steel sensor housings. Nickel is a silver-white metal with excellent ductility and toughness. Its addition has a profound impact on the crystal structure and corrosion resistance of stainless steel. During the alloying process of stainless steel, nickel can form a stable solid solution with iron elements, which helps optimize the crystal structure of stainless steel and reduce possible defects. This enhancement of structural stability makes 304 stainless steel more difficult to be affected by the external environment, thus improving its overall stability.

Passivation treatment is a process that uses chemical methods to form an extremely thin and dense oxide film on the surface of stainless steel. This oxide film is closely combined with the stainless steel substrate and has excellent chemical stability and corrosion resistance. During the passivation process, the metal atoms on the stainless steel surface react with the oxidant in the passivation agent to form a dense layer of oxide, which effectively isolates the metal from contact with the external environment. This oxide film not only prevents oxygen, water and other corrosive media from corroding stainless steel, but also enhances the hardness and wear resistance of its surface. Therefore, the passivated stainless steel sensor housing has better corrosion resistance and can maintain its original performance and appearance for a long time in harsh environments.

In addition to passivation, other surface treatment processes such as polishing and sandblasting are often used in the manufacturing process of stainless steel. Polishing is the removal of burrs, oxide scale and tiny defects on the surface of stainless steel through mechanical or chemical methods to make the surface smooth and bright. Polishing not only improves the aesthetics of stainless steel, but also reduces the roughness of the surface and reduces the adhesion and accumulation of corrosive media on the surface, thereby enhancing its corrosion resistance. Sandblasting uses high-speed jets of sand to impact the surface of stainless steel to form a certain roughness and texture. Sandblasting treatment can not only increase the friction on the stainless steel surface and improve its connection performance with other components, but also enhance its resistance to corrosive media to a certain extent.

To sum up, the corrosion resistance of the 304 stainless steel sensor housing is achieved through the combination of its specific chemical composition, surface treatment and manufacturing process. This excellent corrosion resistance enables the 304 stainless steel sensor housing to operate stably for a long time in harsh environments such as high humidity, high salt, and high temperature, effectively protecting the sensitive sensors or transducers inside from corrosion damage. Whether in industrial production lines, marine environments or chemical industries, the 304 stainless steel sensor housing can demonstrate its excellent corrosion resistance, ensuring the stability and reliability of the sensor.