The core of surface treatment for titanium rods lies in removing oxidation and contaminating layers, and enhancing smoothness and corrosion resistance.

       Complete process of titanium rod surface treatment

       1. 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 oxide layer from hot processing.

       2. Chemical acid pickling (most crucial: removing hydrogen, contaminants, and oxidation)

       Common acid solution: 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 pickling, it is necessary to rinse with plenty of clean water + neutralize

       Prevent over-corrosion and hydrogen embrittlement

       3. Bright treatment (selected based on precision)

       (1) Rough polishing / Semi-fine polishing

       Use belt grinding and wheel grinding to 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

       4. Passivation / Bright Annealing (Corrosion Resistance Enhancement)

       Vacuum annealing / Argon-protected annealing

       Stress relief, with a bright surface that is not oxidized.

       Chemical passivation

       Further strengthen the oxide film to enhance corrosion resistance.

       5. 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).