there are mature, engineering‑applicable accelerated patina treatment methods for SPA‑H. They can shorten patina formation from 1–3 years to days or weeks, while ensuring uniform color and stable adhesion.
1. Mechanical + Chemical Combined Acceleration (Most Common in Industry)
Surface pretreatment
Sandblasting / shot blasting to remove mill scale
Creates a clean, rough surface for fast oxidation
Chemical accelerator spraying
Apply a specially formulated patina accelerator solution
Main components: oxidizing agents, acidic regulators, trace metal salts
Forms a uniform precursor oxide layer in 1–3 days
Controlled wet‑dry cycles
Spray water + air drying to simulate outdoor exposure
Promotes rapid formation of dense, stable patina
Result: Mature dark brown patina within 2–4 weeks, uniform and stable.
2. Artificial Chemical Pre‑Patination
Professional industrial pre‑patination solution sprayed in multiple passes
Can directly fix color at:
Light orange‑brown
Reddish‑brown
Chocolate dark brown
Forms an artificial but structurally similar patina to natural aging
Subsequent outdoor exposure only slightly deepens color
Advantage: Fast, controllable color, suitable for architectural facades.
3. Pickling + Accelerated Oxidation
Remove oxide scale and surface impurities via acid pickling
Then use low‑concentration oxidizing solution to promote initial oxidation
Forms uniform early rust layer and speeds up natural patina
Suitable for: Thin sheets, precision components.
4. Thermal Acceleration (Semi‑Industrial)
Flame treatment or low‑temperature heating to form a uniform primary oxide film
Combined with humidity and oxidation treatment
Accelerates nucleation and shortens the early rust stage
5. Wet‑Dry Cycle Simulation (Laboratory / Workshop)
Use spraying equipment to create periodic wetting and hot‑air drying
Simulates ideal outdoor weathering conditions
Greatly speeds up patina maturation without chemical agents
Environmentally friendly, no chemical residues.
