Causes of rust in stainless steel bag filters.
Chloride corrosion: During water treatment, water may contain chloride ions, which can chemically react with stainless steel, resulting in the formation of iron chloride on the surface of stainless steel, which can cause corrosion.
Redox reaction: Under high temperature and high pressure conditions, the iron in stainless steel may undergo redox reaction with oxygen to form iron oxide, which will lead to rust on the surface of stainless steel.
Mechanical wear: During the operation of the equipment, it may be subjected to external forces, resulting in surface wear, which exposes the iron element inside, and undergoes redox reaction with oxygen to form iron oxide, resulting in rust.
Ambient humidity: In a humid environment, the moisture on the surface of stainless steel can easily adsorb oxygen and carbon dioxide in the air, forming carbonates and oxides, which can lead to rust on the surface of stainless steel.
Treatment method of rust of stainless steel bag filter.
Cleaning: We need to clean the rusty filter to remove rust and impurities from the surface. It can be cleaned with neutral detergents or special stainless steel cleaners, and avoid using acidic or alkaline detergents to avoid secondary corrosion on the stainless steel surface.
Sanding: After cleaning, the surface of the stainless steel needs to be sanded to remove rust and oxide layers. Sandpaper, wire brush and other tools can be used for grinding, pay attention to the grinding should be uniform and meticulous, to avoid damage to the surface of stainless steel.
Polishing: After sanding, the stainless steel surface needs to be polished to restore a smooth surface. You can use polishing paste, polishing wheel and other tools for polishing, and pay attention to keeping the thickness of the polishing paste uniform when polishing to avoid scratches on the surface of stainless steel.
Passivation: After polishing, the stainless steel surface needs to be passivated to prevent rust again. Passivation can be carried out with passivating agent, and after passivation, a dense oxide film will be formed on the surface of stainless steel, which effectively prevents the instruation of oxygen and moisture.
Inspection: After the treatment, it is necessary to inspect to ensure that the surface is free of rust, scratches, and oxide film damage. If there is a non-conformity, it needs to be reprocessed.
Stainless steel cloth bag filter rust precautions.
Choose high-quality stainless steel materials: When purchasing, you should choose stainless steel materials with good corrosion resistance, such as 304 stainless steel, 316 stainless steel, etc.
Water quality control: In the process of water treatment, the water quality should be strictly controlled to avoid excessive content of corrosive substances such as chloride ions and sulfate ions in the water.
Control temperature and pressure: During the operation of the equipment, the temperature and pressure should be controlled within the appropriate range to avoid redox reaction of stainless steel under high temperature and high pressure conditions.
Regular inspection and maintenance: Conduct regular inspection and maintenance, and deal with problems such as rust and wear in a timely manner.
Storage and transportation: During the storage and transportation of the equipment, contact with corrosive substances should be avoided, and direct sunlight and rain soaking should be avoided.