1.What are the requirements for the corrosion resistance of metal materials in the operating and storage environment of agricultural machinery?
Open-air storage and natural erosion: Agricultural machinery is exposed to the open air for a long time, and is repeatedly washed by rain, dew, and humid air. Especially in the rainy season or high humidity areas (such as rice fields in the south), metals are prone to electrochemical corrosion due to moisture.
Chemical erosion of soil and fertilizers: The soil in contact with farming contains salt and humic acid. During the fertilization process, chemical fertilizers (such as nitrogen fertilizers and phosphate fertilizers) and pesticides will be contaminated. These ingredients will accelerate the rusting of steel (for example, ammonium salts in fertilizers will destroy the oxide film on the metal surface).
Wear and corrosion from mud and impurities: During field operations, agricultural machinery parts (such as plowshares, seed drill chains, and harvester chassis) are often in contact with mud and sand. While mechanical wear destroys the surface protective layer, minerals in the water further aggravate corrosion.
2.What are the mechanical strength requirements under complex working conditions?
Mechanical properties of base steel: The base material of galvanized steel is mostly low-carbon steel or low-alloy steel, which has sufficient tensile strength, hardness and toughness to meet the load-bearing and impact resistance requirements of agricultural machinery parts.
The galvanizing process does not damage the base performance: Hot-dip galvanizing and other processes will not significantly reduce the mechanical properties of steel while forming a protective layer, ensuring that agricultural machinery is not easily deformed or broken during heavy-load operations such as plowing and harvesting.
Wear resistance and weather resistance: The zinc layer itself has a certain hardness and can resist slight wear from soil particles, straw, etc.; and the zinc layer will form a dense protective film of zinc oxide and zinc hydroxide during the corrosion process, delaying further loss.
3.Where are the economic benefits and maintenance convenience of long-term use reflected?
Extend service life: In a moderately corrosive environment, the zinc layer of hot-dip galvanized steel can provide 10-20 years of effective protection, far exceeding ordinary steel, reducing the frequency of agricultural machinery replacement.
Reduce maintenance costs: Galvanized steel does not require frequent rust removal and painting, which is especially suitable for scenes in rural areas where professional maintenance conditions are lacking. In contrast, ungalvanized steel parts need to be treated with anti-corrosion every year, which has higher cumulative costs, and the maintenance process may affect the operation time of agricultural machinery.
Adapt to extensive use: In agricultural production, agricultural machinery often suffers surface damage due to collision and friction. Even if the zinc layer of galvanized steel is partially damaged, it can still delay the corrosion of the substrate through the "sacrificial anode" effect, while ordinary steel will quickly rust through once the paint falls off.
4.How about the special application scenarios in agricultural production?
Water-related operation requirements: rice transplanters, paddy field tractors, etc. need to operate in water. Galvanized steel can resist the corrosion of fresh water or brackish water and prevent key components from failing due to rust.
Balance between lightness and durability: Modern agricultural machinery pursues lightness to reduce fuel consumption. Galvanized steel can reduce weight while maintaining corrosion resistance through reasonable thickness design, which is better than heavy untreated steel or expensive stainless steel.
Indirect food safety guarantee: Some agricultural machinery is in direct contact with agricultural products. The corrosion products of the zinc layer of galvanized steel are non-toxic, and it is not easy to produce metal debris due to rust to contaminate agricultural products. It is safer than painting.
5.What is the core logic behind the "must use galvanized steel" in agricultural machinery?
Solve the triple contradiction of "high corrosion environment + high-intensity operation + extensive maintenance" at a relatively low cost. Galvanized steel has become a "must-have material" for agricultural machinery to operate reliably in harsh environments through its advantages such as sacrificial anode protection, balancing strength and weather resistance, and reducing the cost of the entire life cycle. If it is replaced with ordinary steel, agricultural machinery will rust frequently and its life will be reduced sharply, directly affecting agricultural production efficiency; if high-end materials such as stainless steel are used, the cost is too high and it is difficult to meet the economic requirements of agricultural production. Therefore, galvanized steel is the best choice for agricultural machinery.