Hot Dipped Aluminized Steel Oiled Surface
- Description
Description
Hot dipped aluminized steel oiled surface refers to an aluminium-coated steel coil with a thin protective oil film applied after the hot-dip aluminizing process. This surface treatment is mainly used to improve storage stability, transportation protection, and resistance against moisture-related surface defects.
Although aluminized steel provides excellent oxidation resistance through its aluminium-rich coating, the coating surface can still be affected by handling scratches, cut edges, condensation, and long-term storage conditions. An oil film creates an additional temporary barrier between the metal surface and the surrounding environment.
What Is an Oiled Surface on Aluminized Steel Coil?
An oiled surface means that a controlled amount of protective oil is applied onto the aluminized steel surface after coating. The oil layer does not replace the aluminium-silicon coating; instead, it provides temporary protection during storage and transportation.
| Item | Description |
|---|---|
| Base Material | Steel substrate with aluminium-based coating |
| Surface Treatment | Temporary protective oil film |
| Main Purpose | Reduce moisture exposure during storage and transport |
| Protection Period | Depends on oil type, environment, and packaging conditions |
Why Does Aluminized Steel Need Oil Protection?
The aluminium-silicon coating itself provides strong resistance against heat and oxidation. However, practical handling conditions can create small exposed areas, especially at cut edges, slitting edges, welding zones, and surface scratches.
• Reduces moisture contact with the surface
• Helps prevent temporary corrosion during storage
• Protects exposed edges after cutting
• Improves transportation safety in humid environments
Common Oil Types for Aluminized Steel Coil
Different applications require different oil characteristics. The selected oil should match storage time, processing method, and environmental requirements.
| Oil Type | Characteristics | Typical Use |
|---|---|---|
| Mineral Anti-Rust Oil | Stable protective film and good moisture resistance | General storage and transportation |
| VCI Volatile Rust Preventive Oil | Provides additional corrosion protection through vapour phase inhibition | Long-distance export shipment |
| Water-Based Protective Oil | Lower environmental impact and easier cleaning | Environment-sensitive production |
Oiled Surface vs Dry Surface Selection
Choosing between oiled and dry surfaces depends mainly on storage duration, transportation conditions, and downstream processing requirements.
| Condition | Recommended Surface |
|---|---|
| Storage longer than 3 months | Oiled surface |
| Long overseas transportation | Oiled surface with suitable packaging |
| Immediate fabrication after arrival | Dry or lightly oiled surface |
| Painting or bonding process | Surface cleaning required before processing |
Effect of Oiled Surface on Fabrication
The oil film improves storage protection but may require additional preparation before certain manufacturing operations.
| Process | Required Action |
|---|---|
| Stamping | Usually compatible, depending on lubricant requirements |
| Welding | Remove oil contamination near welding areas |
| Painting | Degreasing required before coating application |
| Adhesive Bonding | Clean surface required for proper adhesion |
Oiled Surface Quality Inspection
Quality inspection of an oiled aluminized steel coil focuses on oil distribution, coating condition, and cleanliness.
• Uniform oil coverage across the coil surface
• No excessive oil accumulation or visible oil pools
• No dry areas caused by uneven application
• Controlled oil weight according to customer requirements
• No contamination mixed with the oil film
| Inspection Item | Purpose |
|---|---|
| Oil Weight Measurement | Confirm applied protection level |
| Surface Visual Check | Identify uneven oil distribution |
| Coating Surface Inspection | Confirm aluminium coating integrity |
Purchasing Considerations for Oiled Aluminized Steel Coil
When specifying an oiled aluminized steel coil, buyers should clearly define the oil requirement together with coating grade, thickness, width, and application conditions.
| Specification Item | Confirmation Point |
|---|---|
| Surface Condition | Oiled or dry requirement |
| Oil Type | Anti-rust oil category |
| Oil Amount | Required coating weight range |
| Final Application | Stamping, welding, painting, or direct use |
Teda Ganghua Oiled Aluminized Steel Coil Supply
Teda Ganghua supplies aluminized steel solutions with customized surface requirements, including oiled surface options for customers needing improved storage protection and transportation reliability. For applications requiring consistent quality and specification control, customers can explore aluminized steel coil solutions with technical support.
FAQ About Hot Dipped Aluminized Steel Oiled Surface
1. Why is oil applied to aluminized steel coil?
Oil is applied to provide temporary moisture protection during storage and transportation.
2. Does oil replace the aluminium coating?
No. The aluminium coating provides long-term protection, while oil provides temporary surface protection.
3. Should oiled aluminized steel be cleaned before welding?
Yes. Oil contamination should be removed from welding areas to avoid affecting weld quality.
4. When should buyers choose an oiled surface?
Oiled surfaces are recommended for long storage periods, humid environments, and overseas transportation.
5. How is oil quality checked on aluminized steel coil?
Inspection normally includes oil uniformity, oil weight, surface cleanliness, and coating condition checks.
