The environment of sewage treatment plants is complex, with a large amount of corrosive substances such as hydrogen sulfide, ammonia, acidic and alkaline vapors, and humid air. These corrosive substances can cause serious damage to electronic components, metal casings, etc. of industrial switches, affecting the normal operation and service life of the switches. Therefore, it is crucial to develop a scientific and effective anti-corrosion plan for industrial switches in wastewater treatment plants to meet their anti-corrosion requirements.
Corrosion environment analysis
（1） Gas corrosion
During the sewage treatment process, corrosive gases such as hydrogen sulfide and ammonia are produced in processes such as sludge digestion and anaerobic sewage treatment. Hydrogen sulfide reacts chemically with metals in humid environments, producing metal sulfides that cause corrosion and rusting of metal surfaces; Ammonia will react with certain metals and electronic component materials, damaging their surface structure.
（2） Liquid corrosion
There are various acidic and alkaline wastewater in the sewage treatment plant. If there is leakage or splashing, it will come into contact with industrial switches and cause corrosion to the outer shell and internal components of the switches. For example, acidic liquids may corrode metal casings, damage insulation materials, and affect the normal operation of electronic components.
（3） Humidity impact
The humidity in sewage treatment plants is high, and humid air can form a layer of water film on the surface of industrial switches, accelerating the electrochemical corrosion process of metals. At the same time, it is also easy to cause electronic components to be damaged by moisture, reducing their insulation performance and causing faults such as short circuits.
Design of anti-corrosion scheme
（1） Equipment selection
Choose corrosion-resistant shell materials: Priority should be given to shell materials with good corrosion resistance, such as stainless steel (such as 304, 316 stainless steel), engineering plastics (such as polycarbonate, ABS engineering plastics), etc. Stainless steel has high strength and corrosion resistance, and can resist the erosion of various corrosive gases and liquids; Engineering plastics have the advantages of light weight, good insulation performance, and chemical corrosion resistance, which can effectively protect internal electronic components.
Protection level requirement: Industrial switches should have a high protection level, at least IP65 or above. The IP65 protection level indicates that the device is completely protected from foreign objects and prevents low-pressure jet water from entering from all directions, effectively preventing corrosive substances from entering the interior of the switch and improving the environmental adaptability of the device.
（2） Application of protective technology
Surface coating treatment
Metal shell coating: For industrial switches that use metal shells, surface coating treatment can be applied. Common coating treatment methods include electrophoretic coating, powder coating, etc. Electrophoretic coating can form a uniform and dense coating on metal surfaces, with good corrosion resistance and adhesion; Powder spraying can form a thicker coating, providing stronger protection and effectively isolating metal from corrosive substances.
PCB board protection: Apply three proof paint coating to the printed circuit board (PCB board) of industrial switches. Three proof paint (moisture-proof, anti mold, and anti-corrosion) can form a protective film on the surface of the PCB board, preventing moisture, corrosive gases, and liquids from damaging electronic components on the circuit board, and improving the reliability and stability of the circuit board.
Sealing treatment
Shell sealing: The shell of industrial switches should adopt a sealing design, using sealing materials such as sealing strips and rings to ensure the sealing of the shell and prevent corrosive gases and liquids from entering the interior of the equipment. During installation and maintenance, it is important to check the integrity of the sealing material and promptly replace aging or damaged seals.
Interface sealing: Seal various interfaces of the switch (such as network interfaces, power interfaces, etc.) using waterproof joints, sealing plugs, or waterproof tape to prevent moisture and corrosive substances from entering the device through the interface and ensure the reliability of the interface connection.
（3） Installation and Layout
Installation location selection: Install the industrial switch in a location away from areas with high concentrations of corrosive substances such as sewage treatment tanks and sludge treatment areas, and try to choose areas with good ventilation and dryness. At the same time, avoid installing the switch at the bottom of the equipment or in areas prone to water accumulation to prevent equipment damage caused by liquid splashing or water immersion.
Cabinet installation: Install the industrial switch in a dedicated anti-corrosion cabinet, which should have good sealing performance and ventilation and heat dissipation functions. Fans and other cooling devices can be installed inside the cabinet to ensure that the switch operates within the normal temperature range. In addition, desiccants can be placed inside the cabinet to absorb moisture and reduce the humidity inside the cabinet.
（4） Daily maintenance and monitoring
Regular cleaning: Regularly clean industrial switches to remove dust, dirt, and corrosive substances from the surface. When cleaning, a dry and soft cloth should be used to avoid using cleaning agents containing corrosive ingredients. For difficult to remove stains, a small amount of alcohol or specialized cleaning agent can be used for wiping.
Inspection and maintenance: Regularly inspect the casing, seals, interfaces, and other parts of industrial switches to see if there are signs of corrosion, damage, or aging. Timely replace damaged seals and aging connecting wires to ensure the sealing and electrical connection reliability of the equipment. At the same time, check the operation status of the switch, monitor its working temperature, network performance and other parameters, and promptly handle any abnormalities found.
Corrosion monitoring: Install corrosive gas monitoring equipment in the sewage treatment plant to monitor the concentration of corrosive gases such as hydrogen sulfide and ammonia in real time. When the gas concentration exceeds the safety threshold, timely measures such as ventilation and purification should be taken to reduce the impact of corrosive gases on industrial switches. In addition, the protective coating of industrial switches can be regularly tested to assess their corrosion level, and if necessary, recoated or repaired.
Through reasonable equipment selection, advanced protective technology application, scientific installation layout, and comprehensive daily maintenance and monitoring measures, the anti-corrosion ability of industrial switches in sewage treatment plants can be effectively improved, ensuring the stable operation of switches, extending the service life of equipment, and providing reliable network support for the automation control system of sewage treatment plants. In practical applications, the anti-corrosion scheme should be appropriately adjusted and optimized according to the specific environment and requirements of the sewage treatment plant to achieve the best protection effect.
The above plan takes into account multiple factors and aims to comprehensively ensure the stable operation of industrial switches in harsh environments. You can tell me if the plan meets expectations or provide more specific modification requirements.