Natural erosion and protection during parking of t

Natural erosion and protection during parking of agricultural vehicles

with the changes of seasons and work tasks, most agricultural vehicles are often in a long-term stop state. Vehicles parked for a long time, especially those parked in the open air, are subject to natural erosion such as wind, sun, rain, etc., which makes the vehicles prone to metal rust, rubber products aging, cotton fabric products mildew, oil deterioration, etc., seriously affecting the technical performance and service life of the vehicles. Therefore, in the process of long-term parking, it is necessary to strengthen management and take timely and effective protective measures according to different situations, so as to avoid or slow down the adverse effects of various external factors on the parts during parking, maintain the inherent performance of the vehicle and keep it in a good technical state

1 corrosion and protection of metal parts

metal corrosion refers to the appearance of yellowish brown rust spots on the surface, loss of gloss, and the formation of flake or powdery oxide peeling in serious cases. As a result, Jochen Bauder, general manager of metal parts bond laminates, declared: "Our new tepex fr products have passed the UL 94 fire safety standard issued by the American underwriters' laboratory. The section size is gradually reduced, the mechanical strength is reduced, the service life is shortened, and even the use value is completely lost.

most of the parts of the vehicle are made of black metal materials, and the corrosion is mainly caused by electrochemical corrosion. The internal cause is the impure internal structure of steel materials, and the external cause is the aqueous solution of acid, alkali, salt, oxygen, carbon dioxide The effect of sulfur dioxide, ammonia and other media causes electrochemical corrosion on the metal surface, resulting in gradual corrosion of the metal

the main protection method for the corrosion of vehicle metal parts is to avoid the contact between metal parts and external media, and to prevent and eliminate the conditions for the formation of electrolyte (such as acid, alkali and salt aqueous solution) on the parts. The main measures are:

(1) isolate the metal surface from the outside. Always wipe and maintain the surface of metal parts carefully to remove moisture, dust and other impurities attached to the surface of metal parts. Apply oil, grease, paint or wrap it up with oil paper to isolate it from the outside world

(2) use gaseous or liquid antirust agents in closed containers. For example, vehicle specific deoxidizing sealing agent or vapor phase antirust agent is used in radiators and oil tanks sealed by dry type, and antirust solvent is used in radiators sealed by wet type

(3) seal the pores of all vehicle assemblies to prevent air, moisture, and dust from entering the interior

(4) pay attention to the selection and improvement of the environment of the vehicle parking area. Do not stack garbage, firewood and corrosive substances nearby to prevent the emission of harmful gases. The garage shall be kept clean and ventilated frequently to keep the relative humidity of the air below 70%

2 aging of rubber products 1. Is the fixture of the electronic universal testing machine reasonably designed and protected?

aging refers to the cracking or reduction of elasticity and strength of rubber products such as vehicle tires, gaskets and dust boots, and the surface becomes sticky or hard, brittle, and broken. After aging, the performance of rubber products will deteriorate and the service life will be shortened. The measures to slow down the aging of rubber products are as follows:

(1) avoid exposure to the sun. Under the action of high temperature, the rubber will decompose unsaturated hydrogen sulfide, which is easy to combine with oxygen to accelerate its aging speed. The test shows that the environmental temperature (2) is low, and the rubber aging speed will double when the investment intensity increases by 10 ℃. Especially in direct sunlight, it can promote the aging of rubber. Under the action of light, the permeability of rubber increases, and oxygen is easy to penetrate into the interior to cause oxidation. Light can also turn part of oxygen into ozone (more active than oxygen), which accelerates the oxidation of rubber. In addition, light can also oxidize the free sulfur and combined sulfur in the rubber, and generate sulfuric acid and sulphurous acid in the presence of water, which can damage the rubber. In order to slow down the aging of tires, the external protection shall be strengthened. For example, vehicles shall be stored in the warehouse, and metal garage doors shall be used as far as possible; Apply new technologies and materials, such as painting polyurethane anti-aging coating

(2) avoid long-term stress deformation. When rubber products are subjected to pressure or tension for a long time, fatigue will occur, which will harden the rubber, reduce its elasticity, and cause permanent deformation. In order to prevent the tire from permanent deformation under stress, the tire must be off the ground during long-term parking

(3) avoid oil contamination. After the rubber parts are polluted by mineral oils (such as gasoline, diesel, grease, etc.), the volume expands, the colloid becomes soft, and the elasticity decreases. Therefore, the rubber products shall not be stained with petroleum products. In case of accidental contamination, it shall be cleaned immediately

3 fuel deterioration and protection

the phenomenon of colloid produced by the interaction between fuel and oxygen is called fuel deterioration. When the colloid is serious, it will converge to form colloidal sediment, reduce the evaporation and anti riot of the fuel, block the oil circuit, stick the valve, increase carbon deposition, and affect the power and economy of the engine. The internal cause of colloid formation is that the fuel contains unsaturated hydrocarbons, especially in gasoline. This kind of unsaturated hydrocarbon has poor safety. It will produce peroxides in contact with oxygen at room temperature, which is easy to form rubber. The system and mechanism of state-owned enterprises are not flexible enough. The external factors that accelerate the formation of colloid include: large proportion of air in the container, poor sealing of the container, high temperature and sunlight, water in the fuel oil or unclean container, long storage time, etc. The main measures to prevent and slow down the deterioration of fuel oil are:

(1) the fuel tank shall be thoroughly cleaned and the inner wall of the fuel tank shall be coated with epoxy resin paint as far as possible

(2) oil with good stability shall be filled as much as possible

(3) on the premise of leaving a safe volume, fill up the fuel and cover the seal tightly

(4) avoid direct sunlight and high temperature

(5) regularly check and replace the fuel in a planned way

4 deterioration and protection of wood, cotton and linen products

wood, cotton and linen products such as cargo compartments, cushions, backrests and tarpaulins are easy to absorb water, especially in wet areas or rainy seasons. After absorbing water, these products will accelerate the propagation of monomeric molds, causing decay and mildew. At the same time, wood and cotton products are easy to be bitten by insects and rats. Methods to prevent deterioration of wood, cotton and hemp products are:

(1) use mold inhibitor to inhibit or kill mold. If possible, control the temperature and humidity of the garage to prevent mold growth and reproduction

(2) make regular inspection and cleaning to prevent damage by insects and rats

(3) ventilate and dry the parts frequently