Rust preventive oils leave a protective oil, wax or hard film on the part and are used for storage, shipping and long-term protection. Rust inhibitors are additives dissolved in water-based fluids such as cleaning baths and coolants and give short-term, in-process protection. Most plants use an inhibitor during processing and an oil for storage.
Comparison
The table below summarizes typical differences. Actual performance depends on the specific product.
- Carrier — oils: oil or solvent; inhibitors: water
- Typical protection — oils: months to years; inhibitors: days to weeks
- Surface after treatment — oils: visible film; inhibitors: nearly dry, thin residue
- Typical use — oils: storage, export, equipment; inhibitors: in-process between machining and cleaning
Choosing between them
If parts stay in the plant for hours or days, a water-based inhibitor may be enough. If they will be stored or shipped, use a rust preventive oil — and select the film type according to the protection period and the next process.
MOERY’s approach
MOERY supplies rust preventive oils as standard grades and develops water-based rust inhibitors on request. Share your process steps and we will advise which stage needs which protection.
Frequently asked questions
Can I use a water-based inhibitor for export shipping?
Usually not on its own. Sea freight needs multi-month protection; use a long-term oil film and suitable packing.