What Effects Can Acid Pickling Achieve on UHPC Panel Surfaces? — Acid Pickling Process and Surface Modification

Acid pickling treatment of UHPC board surfaces creates a unique stone-like texture and improves stain resistance. The pickling process adopted by Qinglong Group achieves a surface roughness Ra of 3.2-6.3μm and a contact angle ≥100°, producing a lotus effect and raising the anti-stain rating by 2 levels.

The pickling solution formulation is critical. Diluted hydrochloric acid (5%-8% concentration) is applied for 3-5 minutes. Qinglong Group optimized the process through testing to avoid excessive corrosion. After treatment, the surface is immediately neutralized and rinsed, with the pH adjusted to neutral. This treatment creates a microporous structure on the surface, enhancing adhesion.

Enhanced protective performance. After pickling, the surface is easier to clean, with stain adhesion reduced by 60%. Weathering tests show that treated panels have a color change of ΔE＜3, extending their service life. This process opens up new decorative possibilities for UHPC.