In this company they are using rust preventive oil for soakingboiler accessories. For getting proper viscosity to rust preventive oil theyare using thinner (Hydrocarbon solvent). If the mixture of rust preventive oilis unused for particular period, due to high specific gravity of RP oil incomparison with thinner, RP oil will settle down thinner will be settled ontop.
Rust Preventive Oils are used on various metals like ferrous & non ferrousmetals and alloys to prevent from rust. This oil is widely used in various industries forprotection of steel sheets, component and structure. Rust PreventiveOil, which is well acknowledged for its remarkable features such asexcellent corrosion protection, good surface finish and accurate composition.
The major causes of metal rusting areknown to be oxygen and moisture, while sodium chloride is also a known cause ofrust. This is obvious from the experience that metal products are prone tocorrosion near coastal areas. On the other hand, in the fields of metal membersincluding steel sheets, bearings, steel balls and guide rails, assembly ofparts by hand leads to attachment of chloride and other rust-generatingfactors, resulting in generation of rust. Countermeasures are therefore taken, suchas cleaning removal of rust-causing factors, and the use of rust preventive oillubricants.Rust preventive oils commonly containrust preventive additives (corrosion inhibitors) such as metal sulfonates,sulfonic acid amines, carboxylic acids, esters, amines and the like, but whenthe target of treatment is to be stored for prolonged periods, the rust preventive effect is often insufficientwith rust preventive additives (corrosion inhibitors) alone. Thus, it has beenproposed to use rust preventive oils containing heavy components such as waxesand petrolatum in addition to the aforementioned rust preventive additives, to further increase the rust-preventing property by thickening therust preventive oil coating film.
Such coating films block oxygen and moisturethat are externally-derived causes of rust.