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

      The complete process of surface treatment for titanium rods

      1. Mechanical pretreatment (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 hot processing.

      2. Chemical acid cleaning (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 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 abrasive belt grinding and grinding wheel grinding to improve surface uniformity.

      (2) Fine polishing / Mirror polishing

      Mechanical polishing: capable of achieving Ra≤0.8μm, 0.4μm, 0.2μm

      Electropolishing: The surface is more uniform and stress-free

      4. Passivation / Bright Annealing (Corrosion Resistance Enhancement)

      Vacuum annealing / Argon-shielded annealing

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

      Chemical passivation

      Further strengthen the oxide film to improve 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 resistance, heat insulation, and insulation scenarios (for industrial equipment).