The anti-corrosion measures for wind solar complementary controllers mainly include the following:
Shell protection
Material selection
Use corrosion-resistant materials to make the shell, such as high-quality engineering plastics. Like ABS engineering plastic, it has good chemical corrosion resistance and can resist the erosion of various corrosive substances such as acids and alkalis. This material can effectively protect the internal components of the controller in some harsh outdoor environments.
For some occasions with higher requirements, stainless steel shells are also used. Stainless steel contains alloying elements such as chromium and nickel, which can form a dense oxide film on the surface to prevent further corrosion. Moreover, stainless steel has high strength and can provide good physical protection for controllers.
Surface treatment
Spray paint the surface of the controller casing. The paint layer can serve to isolate the shell from corrosive substances in the outside world. For example, using epoxy paint has strong adhesion, can firmly adhere to the surface of the shell, and has good corrosion resistance and weather resistance.
Some shells may also undergo electroplating treatment, such as galvanizing. The zinc layer forms a protective film of zinc oxide in the air, and even if this film is partially damaged, zinc will act as a sacrificial anode to protect the underlying metal from corrosion.
Internal circuit protection
Circuit board coating
Apply a protective coating on the surface of the circuit board, such as three proof paint (moisture-proof, mildew proof, salt spray proof). This paint can prevent moisture, dust, and corrosive gases from coming into contact with electronic components and circuits on the circuit board. When the controller is in a salt spray environment such as the seaside, the three proof paint can prevent the corrosion of the circuit board by the salt in the salt spray, ensuring the normal operation of the circuit.
Component selection and packaging
Choose corrosion-resistant electronic components. For example, for components with metal pins that are prone to corrosion, special packaged models can be chosen. Like some high-precision resistors, their pins are tin plated to prevent rusting and improve the reliability of the components.
For capacitors and other components, use products with good sealing to avoid internal electrolyte leakage and contamination by external substances, and prevent performance degradation or damage caused by corrosion.
Connection protection
Connector protection
Use connectors with good sealing performance. For example, waterproof aviation plugs have rubber sealing rings at the connection between the plug and socket, which can effectively prevent rainwater, dew, and other substances from entering the connection area, avoiding corrosion and short circuits caused by moisture.
Perform gold plating, silver plating, and other treatments on the metal parts of the connector. These precious metal coatings can improve conductivity while enhancing corrosion resistance, especially in environments with corrosive gases such as sulfides, which can effectively prevent metal connectors from being corroded.
Wire protection
Use insulation and corrosion-resistant outer materials such as polyvinyl chloride (PVC), cross-linked polyethylene, etc. for connecting wires. These materials can prevent the outer layer of the wire from being corroded by acidic and alkaline substances, and also have a certain moisture-proof effect.
Seal the joints of the wires with heat shrink tubing. The heat shrink tubing will tightly wrap around the joint after heating, preventing moisture and corrosive substances from entering the interior of the wire from the joint and protecting the connection part of the wire.