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A rust preventive oil formulation must have high flash point, as it is often used in environments where spills or leaks could be ignited. The rust preventive oil must also have good demulsification properties to allow for easy separation of the rust preventive oil from water or solvents. A high lubricity is another important feature of the rust preventive oil formulation.
Rust preventive oils are commonly used in the automotive industry to protect metal parts and components from corrosion and rust during the manufacturing process. The automotive industry is a major consumer of rust preventive oil and will likely continue to grow in the future as countries shift away from petrol and diesel vehicles toward electric vehicle production.
The rust preventive oil formulations can be made using a variety of base oils. A hydrogenated polyolefin is a preferred base oil because it is easier to wash off and can be easily reused. The hydrogenation process involves saturating the double bonds in the polyolefins, which leads to improved thermal stability and oxidation stability.
A partial ester of a polyhydric alcohol and a monocarboxylic acid, or a partial ester of an oxidized wax or an alkenyl succinic acid is also a preferred base oil. The iodine value of the partial ester is preferably in the range of 5 to 75, and when it is higher than 75, resistance to atmospheric exposure tends to decrease, while solubility tends to increase.
The rust preventive oil formulations can include emulsifiers that enable them to be easily mixed with water to form an oil-in-water emulsion. This allows them to be easily used with a variety of equipment types.