Electrochemical Titanium Anodizing & Non-Ferrous Surface Preparation
Unlike aluminum anodizing—which grows a porous oxide shell that must be filled with organic dyes and sealed—titanium anodizing is a pure electrochemical conversion process. When titanium is immersed in an electrolyte as the anode and subjected to controlled direct current (DC) voltage, oxygen ions combine with the metal surface to form a crystalline, chemically inert titanium dioxide ($\text{TiO}_2$) layer.
Through our certified partner facilities, we provide complete surface preparation and electrochemical anodizing integrated directly with our CNC machining and sheet/bar blank production. Whether you need anti-galling Type II gray anodizing for Marine & Subsea Engineering fasteners or vibrant Type III interference colors for Knife Making & Custom EDC and Motorsport & Exhaust Fabrication, every batch is processed under strict non-ferrous contamination controls and shipped with a Material Test Certificate (MTC) with heat-lot traceability and Certificate of Conformance (CofC).
Type II vs. Type III Titanium Anodizing Comparison
We execute both industrial wear-resistant conversion treatments and precision voltage-tuned optical finishes. Film thickness targets and visual color standards are evaluated per drawing, feature geometry, and batch quantity prior to batch release.
| Feature / Characteristic | Type II Wear-Resistant Anodizing | Type III Interference Color Anodizing |
|---|---|---|
| Primary Purpose | Anti-galling, anti-seizing, wear resistance, and reduced friction | Optical color coding, cosmetic customization, and glare control |
| Visual Appearance | Uniform dark charcoal to matte battleship gray | Full voltage-controlled spectrum (15 V–110 V): Bronze, Purple, Cobalt Blue, Sky Blue, Gold, Rose/Magenta, Teal, High-Voltage Green |
| Color Mechanism | Thickened electrolytic conversion film (no dyes) | Thin-film optical light interference across nanometric $\text{TiO}_2$ layers (no dyes) |
| Dimensional Impact | Negligible buildup; thread pitch diameters remain within class tolerance | Nanometric film growth (~30–200 nm); zero impact on precision bearing bores or threads |
| Typical Applications | Titanium bolts/nuts, sliding subsea valve couplers, threaded actuators, dynamic rotating shafts | 3D-milled folding knife scales, pocket clips, pivot collars, motorsport fluid caps, color-coded instrumentation |
To preview the exact relationship between DC voltage (15 V–110 V), oxide thickness, and surface finish—and to pass your target voltage directly into an inquiry—open our interactive Titanium Anodizing Voltage & Color Explorer.
Pre-Anodizing Surface Preparation: The Key to Saturation & Texture
The anodic $\text{TiO}_2$ layer is completely transparent. Consequently, the final appearance, reflectivity, and fingerprint resistance of an anodized titanium component are determined before the part ever enters the anodizing tank:
1. Non-Ferrous Glass-Bead Blasting (Satin Pearl Finish)
Using dedicated virgin glass beads (100–300 μm / 0.004"–0.012" media range), glass-bead blasting peens the titanium surface gently without sharp micro-cutting. It blends minor CNC toolpath marks into a smooth, low-glare satin pearl texture that retains strong color saturation during Type III anodizing.
2. Alumina Matte Blasting (Tactical Non-Reflective Finish)
Angular aluminum oxide ($\text{Al}_2\text{O}_3$) media micro-etches the titanium surface, creating a uniform, non-reflective matte texture. It is the preferred pre-treatment for Type II anti-galling finishes and subdued tactical earth/bronze/cobalt tones. Furthermore, controlled micro-etching removes the passive native oxide skin so high-voltage Type III colors (80 V–110 V) nucleate evenly.
3. Tumbling & Ceramic Stonewashing (EDC Wear-Hiding Texture)
For Knife Making & Custom EDC components such as folding knife handles, pocket clips, and pry bars, parts are tumbled in rotary or vibratory barrels with ceramic media. Stonewashing creates a randomized micro-scratch pattern that hides everyday pocket wear and fingerprints. A two-tone finish can also be achieved by anodizing a stonewashed part at a base voltage, brushing the raised flats via Mechanical Polishing, and re-anodizing the flats at a lower voltage.
4. Strict Non-Ferrous Media Segregation
We enforce a zero-iron rule across all blasting cabinets and tumbling barrels. If carbon-steel shot or iron-contaminated media contacts titanium, microscopic iron particles embed into the surface. In the anodizing bath, embedded iron causes localized electrical shorting, dark burn spots, and galvanic pitting. Our partner facilities use 100% titanium-dedicated, non-ferrous media circuits.
Single Heat Lot Control to Eliminate Batch Color Shifts
One of the most common failures in outsourced titanium anodizing occurs when a batch of 200 CNC-machined knife scales or instrument bezels comes out of the tank in three slightly different shades of blue or gold.
Alloys such as Grade 5 (Ti-6Al-4V | UNS R56400 | Werkstoff 3.7165 | ВТ6), Grade 23 (Ti-6Al-4V ELI | UNS R56407 | Werkstoff 3.7165-ELI | ВТ6С), and Grade 2 (UNS R50400 | Werkstoff 3.7035 | ВТ1-0) exhibit different anodic film growth rates depending on trace chemistry variations between ingot melts. When Titanium Seller supplies the raw material, CNC machining, and surface anodizing as an integrated package through our partner network, we enforce Single Heat Lot traceability—ensuring every part in your production batch is machined from the exact same melt lot and anodized under matched rectifier parameters.
Preview Your Target Color & Request a Finishing Quote
Test different voltages (15 V–110 V), compare Grade 2 vs. Grade 5 color rendering, and toggle between polished, satin, and matte bead-blasted textures in our Titanium Anodizing Voltage & Color Explorer.