What kind of corrosion will occur on the perforated sieve plate?

What kind of corrosion will occur on the sieve plate?

The first type: intergranular corrosion

When austenitic stainless steel is heated at 450℃~850℃, chromium carbides will be deposited along the grain boundaries, resulting in a chromium-poor zone around the grains. Under the action of the corrosive medium, it can penetrate into the metal along the grain boundaries. A type of corrosion between the qualities is called intergranular corrosion. This type of corrosion causes damage when there is no change in the appearance of the sieve plate, so it is the most dangerous way to damage the stainless steel sieve plate.

The second type: uniform corrosion

The phenomenon that the entire surface of the sieve plate that contacts the corrosive medium corrodes is called uniform corrosion, also known as overall corrosion. A type of surface corrosion, the stainless steel sieve plate has good corrosion resistance, and its uniform corrosion amount is not large.

The third type: pitting corrosion

The corrosion is concentrated in the local area of the metal surface, and quickly develops inside, and finally penetrates: when the surface of the stainless steel sieve plate contacts the chloride ions, the anionic chloride ions are simply adsorbed on the surface of the sieve plate. Individual points, which damage the oxide film at that point, are easily pitted. The appearance defects of stainless steel are also one of the important reasons for pitting corrosion.

The climate environment in different places is different. Even stainless steel cannot be completely rust-free because it may react with certain contents in the air. Therefore, if you need a corrosion-resistant sieve plate, you must try to choose a better material among stainless steel.