How does the Qiaogu rack carry out rust prevention? As a manufacturer of Qiaogu racks with guardrails, let the editor take you to understand it together.
1. Material selection: Improve corrosion resistance from the source
High-strength corrosion-resistant steel
Recommended materials:
Galvanized steel: The surface galvanized layer (thickness ≥80μm) can isolate oxygen and moisture, and the rust prevention performance is better than ordinary carbon steel;
Stainless steel (such as 304/316L): Suitable for high humidity or corrosive environments (such as cold storage, chemical warehouses), but the cost is relatively high.
Analogy: Galvanized steel is like "wearing a raincoat", and stainless steel is like "self-contained waterproof skin".
Surface pretreatment
Sandblasting and rust removal: Remove the oxide scale and rust on the steel surface to meet the Sa2.5 standard (almost no visible rust spots to the naked eye);
Phosphating treatment: Form a dense phosphating film to improve the adhesion of the coating.
2. Coating protection: building a physical barrier
Anti-rust paint coating
Coating type:
Primer: Epoxy zinc-rich primer (zinc content ≥ 70%), providing cathodic protection;
Topcoat: Polyurethane topcoat or fluorocarbon paint, strong weather resistance, can resist ultraviolet rays and acid rain erosion.
Coating process:
Spraying thickness: primer 60-80μm, topcoat 40-60μm;
Coating environment: temperature ≥5℃, humidity ≤85%, avoid dust pollution.
Hot-dip galvanizing process
Principle: immerse the steel in 500℃ molten zinc liquid to form a 0.05-0.1mm zinc-iron alloy layer.
Advantages: Corrosion resistance is 3-5 times that of ordinary painting, suitable for outdoor or humid environments.
Cost comparison: The cost of hot-dip galvanizing is 20%-30% higher than that of ordinary painting, but the maintenance cost is low.
3. Environmental control: reduce corrosion causes
Warehouse environment optimization
Temperature and humidity management:
Temperature: 10-30℃ (avoid high temperature to accelerate oxidation);
Humidity: ≤60% (can be controlled by humidifier or ventilation system).
Case: Due to long-term humidity >80% in a cold storage, the rack was corroded and perforated within 3 years. After replacing it with galvanized steel, the service life was extended to 10 years.
Avoid contact with corrosive substances
Isolation measures:
Plastic pads are installed at the bottom of the rack to avoid direct contact with ground moisture;
When storing acidic and alkaline goods, corrosion-resistant pallets or additional protective layers are required.
4. Maintenance and repair: Extend the life of the protective layer
Regular inspection and cleaning
Inspection cycle:
Check the coating for damage and peeling every month;
Clean the surface dust and oil every quarter (neutral detergent can be used).
Repair/Method:
Damaged coating: Grind to the metal substrate, reapply primer and topcoat;
Minor rust: Clean rust with a wire brush, apply anti-rust oil or anti-rust paste.
Anti-rust oil and corrosion inhibitor
Applicable scenarios: Temporary storage or transportation;
Usage:
Spray anti-rust oil (such as lanolin-based anti-rust oil) to form a protective film;
Add vapor corrosion inhibitor (such as VCI paper or VCI foaming agent) in a humid environment.
