• Selection of Corrosion-Resistant Materials:
  • Housing Materials: Stainless steel, such as 304 stainless steel and 316L stainless steel, is adopted. Among them, 316L stainless steel has stronger corrosion resistance due to the addition of molybdenum. Titanium alloy can also be used, which possesses excellent corrosion resistance, strength, and high-temperature resistance. Additionally, corrosion-resistant composite materials are optional; for instance, some underwater cameras of Hikvision use special anti-corrosion composite materials.
  • Internal Component Materials: For internal metal parts of the camera, such as lens holders and screws, corrosion-resistant materials should also be selected, or anti-corrosion treatments (e.g., nickel plating, chrome plating) should be applied. Meanwhile, electronic components like circuit boards can be coated with "three-proof paint" to prevent corrosion caused by moisture, salt spray, etc.

• Surface Coating Treatment: The outer surface of the camera housing is sprayed with anti-corrosion coatings, such as epoxy resin coatings and polyurethane coatings, which have good seawater immersion resistance and adhesion. Multi-layer composite coating technology can also be employed to enhance the overall anti-corrosion effect. In addition, the surface glass of some cameras undergoes special coating treatment to prevent the adhesion and growth of marine microorganisms, thus avoiding corrosion and damage to the camera surface.

• Optimized Sealing Design: High-precision sealing devices, such as O-rings and sealing strips, are used to ensure complete isolation between the internal camera and the external seawater environment, preventing seawater infiltration. Simultaneously, attention should be paid to avoiding gaps and dead corners in the design to reduce the possibility of seawater residue and corrosion.
• Adoption of Cathodic Protection Technology: This can be achieved through the sacrificial anode protection method or the impressed current protection method. The sacrificial anode protection method uses metals with high electrochemical activity (e.g., magnesium, zinc, aluminum) as anodes, which corrode in seawater to protect the camera's metal housing. The impressed current protection method applies an external DC power supply to the metal structure of the camera to be protected, making the metal structure a cathode and thereby inhibiting corrosion.
• Selection of Appropriate Installation Location and Method: Try to avoid installing the camera in locations where seawater flows too fast, salt concentration is too high, or there is a large amount of sediment—these conditions can easily cause wear and corrosion to the camera. Meanwhile, ensure the camera is firmly installed to prevent seal failure or component damage due to water flow impact and other factors.
• Regular Maintenance and Upkeep: Regularly inspect and clean the camera, and promptly remove dirt, salt, and marine organism attachments from the surface. If wear, coating peeling, or other issues are found on the camera housing, repair or re-spray the coating in a timely manner. In addition, the performance of the sealing devices should be checked regularly; if there are problems such as aging or damage, they should be replaced promptly.

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