The core of surface treatment for titanium rods lies in removing oxidation and contaminant 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 skin caused by thermal processing.

      2. Chemical acid pickling (key: removing hydrogen, contaminants, and 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 pickling, it is necessary to rinse with plenty of clean water + neutralize

      Prevent over-corrosion and hydrogen embrittlement

      3. Bright finish (selected based on precision)

      (1) Rough polishing / Semi-fine polishing

      Use abrasive belt grinding and grinding wheel grinding to improve surface uniformity.

      (2) Fine polishing / Mirror polishing

      Mechanical polishing: achievable 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)

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-insulating, and insulating scenarios (for industrial equipment).