Discoloration of Office Chair Armrests

The repair method for discoloration of office chair armrests should be selected based on the material, as the treatment methods for aluminum alloy and wooden armrests differ. Details are as follows:

Repair of Discoloration on Aluminum Alloy Armrests Discoloration of aluminum alloy is usually caused by the formation of an oxide layer due to long-term contact with hand sweat, dust, or sunlight exposure, resulting in a darkened or mottled surface. Repair methods include:

1. Ginger Stain Removal Method: Slice fresh ginger and directly wipe the oxidized area. The enzymes in ginger can break down the oxide layer, suitable for mild discoloration. After wiping, use a dry cloth to clean off any residual juice.
2. Neutral Detergent Cleaning: Use diluted neutral detergent (such as dishwashing liquid) or a professional metal cleaner, and wipe the surface with a soft cloth. After cleaning, rinse with water and thoroughly dry to avoid secondary oxidation caused by water residue.
3. Polishing and Refinishing: If the oxidation is severe, gently sand the discolored area with 600-800 grit sandpaper to remove the oxide layer, then apply metal wax or spray with matching paint for protection. Cover other areas before painting to ensure even coverage.

Repair of Discoloration on Wooden Armrests Discoloration of wood is often due to expansion and contraction from temperature changes or improper maintenance, leading to paint peeling. Repair requires step-by-step operation:

1. Surface Cleaning: Sand the paint-peeled area down to the wooden base with 120-180 grit sandpaper, remove dust, wipe with a damp cloth, and let it dry. If there is mildew on the base, disinfect with alcohol first.
2. Patching and Coloring: Select a paint repair paste or wood finish that matches the original paint color and apply in layers. Each layer needs 2-3 hours to dry, avoiding thick application that may cause cracking. For color matching, consult the merchant or a professional repair person.
3. Drying and Polishing: Let it stand for 24-48 hours to ensure the paint layer is fully cured, then lightly sand the surface with 400 grit or finer sandpaper until smooth, and finally wipe with wood wax oil for protection, enhancing wear resistance and gloss.

Preventive Recommendations

• Aluminum Alloy Armrests: Avoid using acidic cleaners (such as vinegar, lemon juice), reduce direct contact with cosmetics and sweat; cover with a dust cloth when not in use for a long time.
• Wooden Armrests: Keep away from heating vents and air conditioning outlets to prevent expansion and contraction; apply wood oil every 3-6 months to form a protective film; avoid direct sunlight and use curtains for shading.

If precious woods (such as rosewood, walnut) are involved or the discolored area exceeds 30%, it is recommended to contact professional repair personnel to avoid further damage due to improper operation.