EPS Processed Steel Is Rust Resistant
TMW's EPS No Rust Warranty
TMW's EPS-processed material – whether dry or with oil applied – is GUARANTEED to remain free of rust longer than traditional acid-pickled steel with a medium coat of oil, when handled in the same manner.
We are so confident of the rust resistance of EPS-processed material, we offer the following warranty for our EPS processing:
EPS-processed material – whether dry or oil-applied – is warranted against rust formation on the sheet or coil surface for 180 days from the date of processing for issues reported within the same period. It is not warranted against rust resulting from improper handling or storage practices that bring the surface into direct contact with moisture, including rain, temperature change condensation or fingerprints.
EPS-processed steel resists rusting when handled/stored such that it does not come into contact with moisture.
We warrant this rust-resistance.
This property of EPS-pickled steel – rust-resistance with no protective oil or coating – has been proven in the laboratory and actual processing environments. It's why virtually all TMW's EPS customers order EPS without oil.
In acid pickling, the HCl's reaction with surface oxides leaves trace amounts of chloride salts on the metal surface. These chloride salts react rapidly with any moisture they encounter, promoting rusting and resulting in early and catastrophic paint failures. EPS pickling leaves no chloride salts.
Also, an additive is used in the EPS system slurry solution to reduce "smut" on the finished strip This additive contains a rust inhibitor, a residual amount of which remains on the surface after rinsing. It has no impact on paint performance, but enhances EPS's rust resistance.
No Rusting Means No Oil –
A Major EPS Advantage
Rust resistance allows users to order EPS 'dry' - no oil or other protective coating. That offers many advantages in downstream processing and fabrication (see 'No Oil Needed' page). There are other advantages to using clean, dry steel:
- Consolidate multiple orders for hot roll black, HRPO and pickled dry into a single EPS order
- Paint pre-treatment can be 'leaned out', reducing cost, but not paint performance
- Shop environment, machines – even employee clothing – all stay cleaner