The rust prevention of manual forklifts should be combined with their operating environment and structural characteristics, and comprehensive measures should be taken from five dimensions: daily cleaning, regular inspections, protective coatings, material upgrades, and environmental control. The following are specific methods and implementation points:

1、 Daily cleaning: block contact with corrosive media

Cleaning of key areas

Forklift and gantry slide: After daily operation, remove dirt, sand, and other debris to prevent coating damage caused by friction.

Engine compartment and battery area: Internal combustion forklifts need to clean the residual sulfur and chloride ions in the combustion exhaust gas; Electric forklifts need to check for battery acid mist leakage and wipe the electrode posts with a neutral cleaner.

Hydraulic system components: Clean the lifting cylinder and tilting cylinder piston rod to prevent dust from entering the sealing ring and causing leakage.

Selection of cleaning tools

Rinse with a soft bristled brush or low-pressure water gun (pressure ≤ 0.3MPa) to avoid coating peeling caused by high-pressure water impact.

When drying, natural air drying is preferred. In emergency situations, compressed air (pressure ≤ 0.2MPa) can be used to blow dry the moisture in the gaps.

2、 Regular inspection: prevent hidden corrosion

Fastener inspection

Forklift support and lifting chain tightening screws: Use a torque wrench to check the bolt pre tightening force every month. The torque value of the internal combustion forklift must meet the requirements of the manual (such as a 3-ton forklift fork frame bolt torque of about 200-250N · m).

Wheel screws and fixing pins: Check the connection between the wheel hub and the wheel rim every quarter to prevent loosening caused by vibration.

leak detection

Hydraulic system: Check the pipe joints and cylinder seals for oil stains every week. For internal combustion forklifts, additional checks are required on the bottom of the diesel and engine oil tanks.

Cooling system: Check the water tank and water pump connections monthly, and pay attention to the motor coolant level for electric forklifts.

Sediment cleaning

Oil filter: Replace the filter element every 500 hours and clean the sediment on the filter base to prevent acidic substances from corroding the housing.

3、 Protective coating: Building a physical barrier

Coating selection

Body shell: Made of polyurethane topcoat (salt spray resistance ≥ 500 hours), recommended thickness of 80-100 μ m, and preferred light colors (such as yellow and orange) to reduce heat absorption.

Chassis and fork: Use epoxy zinc rich primer (dry film zinc content ≥ 80%) as the base coat, and acrylic polyurethane paint as the topcoat, with a total thickness of ≥ 120 μ m.

Coating repair

When the coating is found to be damaged, sandpaper (400-600 grit) should be used to polish it to the metal substrate. First, apply anti rust primer (such as zinc phosphate primer), and then spray the topcoat after 24 hours.

4、 Material upgrade: Improve corrosion resistance from the source

Metal material substitution

Forks and key structural components: Made of 304 stainless steel (containing 18% chromium and 8% nickel) or Q355NH weather resistant steel (with an atmospheric corrosion resistance index ≥ 6.0), replacing ordinary Q235 carbon steel.

Fasteners: Use 316L stainless steel bolts (resistant to chloride ion corrosion) or Dacromet coated bolts (resistant to salt spray ≥ 1000 hours).

Application of non-metallic materials

Sealing element: The hydraulic system sealing ring is made of fluororubber (FKM), with a temperature resistance range of -20 ℃ to+200 ℃ and better oil resistance than nitrile rubber (NBR).

Dust cover: The dust cover of the steering hydraulic cylinder piston rod is made of polyurethane (PU) material, which has a wear resistance 3-5 times that of rubber.

5、 Environmental control: reduce the causes of corrosion

Storage environment optimization

Humidity control: Install dehumidifiers in the warehouse to maintain a relative humidity of 40% -60% and avoid condensation on metal surfaces.

Ventilation design: The forklift parking area adopts natural ventilation or mechanical exhaust, with a ventilation rate of ≥ 3 times per hour to prevent the accumulation of corrosive gases (such as chloride ions and hydrogen sulfide).

Special scenario protection

Usage in coastal areas: Rinse the vehicle with fresh water after daily work, with a focus on cleaning up salt residues; Spray water-based rust inhibitor (such as WD-40 special rust inhibitor) once a month.

In the chemical industry, PTFE coating is sprayed on the surface of forklifts, which has better chemical corrosion resistance than ordinary paint and can resist more than 90% of industrial chemical erosion.

The main equipment produced by Hebei Makita: stage electric hoist, electric chian hoist, wire rope electric hoist，Hand chain hoist, lever hoist, pneumatic hoist and other lifting equipment