SPA-H Corten Steel Plate is a high-performance weathering steel plate that forms a thin, transparent passivation layer on its surface, providing outstanding protection against rust and corrosion.
This protective layer ensures that SPA-H Corten Steel Plate not only resists oxidation in outdoor environments but also withstands aggressive corrosive media without deteriorating.
This self-healing property is a key feature of SPA-H Corten Steel Plate-the passivation layer automatically regenerates after any damage, protecting the exposed surface and maintaining long-term durability.
Proper surface treatment is essential when preparing SPA-H Corten Steel for further processing, such as plating. Due to the unique properties of the surface passivation film, achieving a strong bond for coatings requires specific pre-treatment processes.
After the standard degreasing procedure, SPA-H Corten Steel Plate should undergo anodic degreasing under controlled temperature and time conditions to avoid excessive surface damage.
This process removes any residual oils or impurities and prepares the surface for optimal plating adhesion.
Following anodic degreasing, the surface of SPA-H Corten Steel Plate is further activated by immersing it in a solution containing 1% sulfuric acid and 0.1% hydrochloric acid at room temperature for 1 minute. This process enhances the surface's ability to bond with the plating, ensuring a smooth and long-lasting coating.
If SPA-H Corten Steel Plate has a thicker oxide layer or oxidation scale, acid pickling becomes necessary. This step involves immersing the steel in an 8%-20% hot sulfuric acid solution (at temperatures between 45°C to 60°C) to remove the oxidation layer.
The steel is then polished in a solution made of 330ml/L nitric acid, 100ml/L hydrofluoric acid, and 30ml/L hydrochloric acid, at a temperature of 50°C to 60°C, for a period of 1 to 10 minutes.
This method not only removes stubborn oxide layers but also restores the natural appearance of SPA-H Corten Steel Plate, preparing it for a flawless plating application.
This thorough surface treatment ensures that SPA-H Corten Steel Plate retains its corrosion-resistant properties while also achieving high-quality plating results, suitable for various industrial applications, including architectural facades, outdoor structures, and decorative elements.
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