When metal surfaces are exposed to air and moisture, they become susceptible to rust.
Fortunately, rust preventative oils have been specially formulated to protect them from this corrosive process. Oils work by forming a barrier between metal surfaces and the elements that result in rust. They coat metal in a robust, water-repellent film, temporarily sealing it against moisture and air. Rust preventatives also include inhibitors that impede rusting further, allowing for long-term protection.
Forming a physical barrier
The main way rust preventatives work is by creating a physical film on metal surfaces. Waxy and hydrophobic, the protective layer serves as a shield, stopping water and other unwanted contaminants like dirt and oxygen from making direct contact with metal components and surfaces.
Water displacement
Leading rust preventative oils are formulated with dewatering agents like sulphonates. These additives effectively displace any moisture present on a metal surface, like a machine operator’s sweat or liquids used as part of a machining processes, and replace wetness with the waxy film.
Corrosion inhibitors
Many rust preventatives also feature corrosion inhibitors. Chemical compounds, inhibitors are specially designed to prevent rust formation.
Corrosion inhibitors are typically polar molecules with a strong affinity for metal surfaces. As a result, they chemically bond with metal, creating a passive film to protect it against corrosive elements. Other inhibitors may also work by neutralising acidic substances that often contribute to rusting, offering an extra layer of defence.
Rust preventative components and their advantages
Many preventative oil formulations are engineered with surfactants called “wetting agents”, such as sodium sulphonates. These agents let the inhibitor molecules distribute evenly and create a stronger bond with metal surfaces.
Flexible solutions, rust preventatives can be oil-based, aqueous-based or solvent-based. Consequently, they can see use protecting metal parts under various conditions. They are applied regularly for metal components in use, before and during shipping, or to provide long-term protection for parts in storage.
While rust preventatives are required to protect parts made from ferrous metals like iron and iron alloys like steel, they can also impede rust on non-ferrous metals.
If you’re looking for a dependable rust preventative, we can help. Browse our high-quality rust preventative products from leading brands like Millers and Houghton today.
