Rust Prevention Measures for Container Houses

Rust prevention for container houses requires a comprehensive approach involving material selection, process treatment, and regular maintenance, with the core goal of blocking rust conditions and regularly repairing potential issues.

I. Material and Process Selection

1. Steel Pretreatment
   The surface of the steel must be thoroughly derusted to remove impurities such as oxide scale and oil, ensuring good coating adhesion. Companies like Zhongye Zhichuang use sandblasting or shot blasting processes to achieve a Sa2.5 cleanliness level on the steel surface, providing a solid foundation for subsequent anti-corrosion layers.

2. Anti-Corrosion Coating System

   • Primer + Topcoat Combination: Epoxy zinc-rich primer (providing cathodic protection) is preferred, paired with acrylic or polyurethane topcoats (weather-resistant and chemically resistant). For example, specialized acrylic topcoats dry rapidly, with a surface dry time of ≤30 minutes and a hard dry time of ≤6 hours at room temperature, reducing construction time by 40% and offering a protective lifespan of 8-12 years.
   • Heavy-Duty Anti-Corrosion Solution: For salt-spray environments like coastal areas, heavy-duty anti-corrosion coatings (such as epoxy glass flake paint) or hot-dip galvanizing processes are used. Hot-dip galvanizing forms a zinc-iron alloy layer by immersing the steel in molten zinc, offering far superior durability to ordinary coatings and suitable for outdoor scenarios where maintenance is difficult.

3. Structural Reinforcement and Detail Handling

   • Use thickened galvanized square tube frames, with the galvanized layer delaying rust and suitable for outdoor environments.
   • Welding areas must be ground smooth and re-coated with epoxy primer to prevent welds from becoming rust initiation points.
   • Elevate the base of the container to avoid direct contact with ground moisture, reducing the risk of rust at the bottom.

II. Environmental Adaptation

1. Climate-Based Maintenance

   • Inland Dry Areas: Recoat the anti-corrosion layer every 8-12 years.
   • Southern Humid Areas: Recoat every 7-10 years and enhance ventilation design to reduce internal condensation.
   • Coastal Areas: Upgrade to heavy-duty anti-corrosion solutions every 3-5 years and regularly inspect and repair salt-spray corrosion damage.

2. Physical Protection Measures

   • When stored long-term, use sunshades or waterproof covers to avoid direct sunlight and rain erosion.
   • During transportation, avoid obstacles to prevent coating scratches that could lead to localized rust.

III. Regular Maintenance and Repair

1. Daily Inspection
   Inspect welds, corners, and the bottom (areas prone to water accumulation) annually, and immediately grind and re-coat small rust spots with anti-rust paint upon discovery.

2. Coating Repair Cycle
   Adjust the recoating frequency based on environmental humidity, with shorter cycles required in humid areas. For example, in southern rainy regions, a comprehensive inspection and topcoat reapplication are recommended every 5 years.

3. Internal Moisture Control
   Use moisture-proof and thermal insulation cotton to line the interior walls, reducing internal humidity and minimizing rust risks caused by condensation.