How should metal guardrail be maintained?

Metal guardrails, composed of various materials such as iron, stainless steel, and aluminum alloy, require different maintenance methods. However, there are also general maintenance principles that apply to all types of metal guardrails. The following outlines the specific maintenance methods for metal guardrails:

### General Maintenance Principles
– **Regular Cleaning**: Regularly clean dust, dirt, and debris to prevent long-term accumulation, which can affect the appearance of the metal guardrail and potentially cause corrosion due to corrosive substances.
– **Avoid Collision**: Protect the metal guardrail from collisions and scratches by sharp objects. Such damage can compromise the protective layer on the surface, leading to rust or corrosion.

### Material-Specific Maintenance Methods

#### Wrought Iron Guardrails
– **Anti-Rust Treatment**: Iron guardrails are prone to rusting. Conduct a comprehensive inspection at least annually to check for peeling or damaged anti-rust paint. If rust is found, smooth the affected area with sandpaper, remove the rust, apply an anti-rust primer, and then repaint after the primer has thoroughly dried to extend the service life.
– **Regular Paint Maintenance**: Re-paint every few years (typically every 2-3 years) based on actual use and appearance to add a new protective layer and enhance aesthetics.

#### Stainless Steel Guardrails
– **Choose Appropriate Cleaning Supplies**: Daily cleaning is simple; use a clean soft cloth or sponge dipped in water. For oil stains or stubborn marks, use a neutral cleaner. Avoid using abrasive tools like steel wool to prevent scratching the surface and compromising its anti-corrosion properties.
– **Inspect Connectors Regularly**: Check connectors every six months to one year for loose screws or cracked solder joints. Tighten screws promptly if loose, and seek professional welding repair for cracked solder joints to ensure structural stability.
– **Prevent Chemical Corrosion**: Avoid contact with acidic or alkaline chemicals. In case of accidental contact, rinse immediately with water and inspect for signs of corrosion. Apply a stainless steel care agent if slight corrosion is detected.

#### Aluminum Alloy Guardrails
– **Proper Cleaning Method**: Clean every 2-3 months by rinsing with water to remove dust and dirt. For stubborn stains, use a mild detergent and wipe gently with a soft cloth, followed by thorough rinsing. Avoid detergents containing abrasive agents or strong alkalis to protect the oxide film on the surface.
– **Check Surface Coating**: Regularly inspect the coating for wear, fading, or peeling. Minor damage can be repaired with matching touch-up paint. For more severe damage, professional respraying may be necessary to restore protective performance and appearance.
– **Lubricate Moving Parts**: If the guardrail includes moving parts like hinges, apply lubricating oil every three months to ensure smooth operation, reduce wear, and extend service life.