The core of surface treatment for titanium rods lies in removing oxidation and contamination layers, and enhancing smoothness and corrosion resistance.
Complete process of titanium rod surface treatment
Special surface treatment (optional as needed)
anodizing
It can be colored (blue/black/gold, etc.), enhancing the hardness and insulation properties of the film layer.
Coating / Spraying
Used for wear-resistant, heat insulation, and insulation scenarios (for industrial equipment).

Mechanical preprocessing (mandatory)
Turning / Rough grinding
Remove forging skin, cracks, and oxide scale to ensure roundness and straightness.
Sandblasting / Shot blasting
Used for roughening the surface or removing the black skin caused by thermal processing.

Chemical acid pickling (key: remove hydrogen, remove contamination, remove oxidation)
Common acid mixture: nitric acid + hydrofluoric acid (HNO₃+HF)
Function:
Remove oxide layer, nitride layer, and contamination layer
Unify the surface color and reveal the natural metal color
Improve the adhesion of subsequent polishing and anodizing
Key points:
Strictly control the concentration, temperature, and time
After acid washing, it is necessary to rinse with plenty of clean water + neutralize
Prevent over-corrosion and hydrogen embrittlement

Bright finish (selected based on precision)
(1) Rough polishing / Semi-fine polishing
Belt grinding and wheel grinding can improve surface uniformity.
(2) Fine polishing / Mirror polishing
Mechanical polishing: can achieve Ra≤0.8μm, 0.4μm, 0.2μm
Electropolishing: The surface is more uniform and stress-free, making it suitable for medical and high-end chemical applications

Passivation / Bright Annealing (Corrosion Resistance Enhancement)
Vacuum annealing / Argon-protected annealing
Stress relief, with a bright and non-oxidized surface.
Chemical passivation
Further strengthen the oxide film to enhance corrosion resistance.