Post Finishing Solutions

Medical-Grade Surface Treatment & Precision Finishing

1. Sandblasting

Process Introduction

Sandblasting creates a micro-rough surface to enhance osseointegration for orthopedic implants, removing oxides and scale while providing a uniform matte finish. It is widely used for bone-contacting implant surfaces to improve long-term clinical stability.

Technical Specifications

Parameter
Specification
Media Type
Medical-grade glass beads / alumina

Typical Orthopedic Applications

· Implants: Trauma plates, bone screws, spinal fusion cages, porous implant surfaces

· Instruments: Non-slip instrument handles, textured high-precision tool components

Working Pressure
0.2–0.6 MPa
Surface Roughness (Ra)
2.0–8.0 μm
Coverage
Full 360° for complex anatomical geometries
Compatible Materials
Titanium alloys, medical stainless steels, CoCr alloys

2. Polishing

Process Introduction

Polishing reduces surface roughness to minimize wear, friction and tissue irritation, improving biocompatibility and aesthetic appearance for articulating surfaces and surgical instruments.

Technical Specifications

Parameter
Specification
Final Surface Roughness (Ra)
≤0.025–0.8 μm

Typical Orthopedic Applications

· Implants: Hip/knee prostheses, femoral heads, acetabular liners

· Instruments: Osteotomes, forceps tips, minimally invasive shafts

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Polishing Steps
Coarse → Fine → Super-finish
Finish Type
Burr-free, high-gloss or matte
Polishing Speed
1000–3000 rpm
Compatible Materials
CoCr, Titanium alloys, stainless steel, ceramics

3. Electropolishing

Process Introduction

Electropolishing removes micro-burrs and surface contaminants, forming a smooth passive oxide layer to improve corrosion resistance and cleanability for surgical instruments and implants.

Technical Specifications

Parameter
Specification
Electrolyte
Medical-grade acidic solution

Typical Orthopedic Applications

· Implants: Small bone screws, non-magnetic components

· Instruments: Reusable surgical tools, endoscopic parts

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Surface Roughness (Ra)
0.1–0.4 μm
Current Density
10–30 A/dm²
Processing Temperature
20–40°C
Compatible Materials
316L, Nitinol, Titanium alloys

4. Passivation

Process Introduction

Passivation forms a protective chromium oxide layer to prevent rust and corrosion, enhancing biostability and meeting medical implant cleanliness standards.

Technical Specifications

Parameter
Specification
Chemical Solution
20–45% nitric acid

Typical Orthopedic Applications

· Implants: Bone pins, auxiliary fixation devices

· Instruments: All reusable stainless steel instruments

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Treatment Time
20–30 minutes
Treatment Temperature
25–60°C (adjustable)
Key Function
Remove free iron, form passive oxide film
Compatible Materials
316L / 316LVM stainless steel

5. Laser Marking

Process Introduction

Laser marking provides permanent, non-damaging identification for full traceability (UDI, lot number, serial number) without affecting biocompatibility.

Technical Specifications

Parameter
Specification
Laser Power
20–50W

Typical Orthopedic Applications

· Implants: UDI marking, lot & serial number tracking

· Instruments: Manufacturer, batch & sterilization marking

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Wavelength
1064 nm
Marking Depth
0.05–0.20 mm
Marking Speed
50–300 mm/s
Compatible Materials
All medical metals, PEEK, ceramics

6. Heat Treatment

Process Introduction

Heat treatment optimizes hardness, strength and fatigue resistance; relieves internal stress to avoid deformation in high-stress orthopedic parts.

Technical Specifications

Parameter
Specification
Temperature Range
500–960°C

Typical Orthopedic Applications

· Implants: Bone screws, intramedullary nails, joint stems

· Instruments: High-torque tools, durable shafts

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Temperature Accuracy
±5°C
Common Processes
Stress relieving, solution annealing, age hardening
Processing Time
2–6 hours (per batch)
Compatible Materials
Titanium alloys, stainless steel, CoCr, 17-4PH

7. Anodizing

Process Introduction

Anodizing forms a dense, protective oxide film on titanium surfaces, improving corrosion resistance, insulation and wear resistance. It also allows color coding for implant size identification in orthopedics.

Technical Specifications

Parameter
Specification
Film Thickness
5–20 μm

Typical Orthopedic Applications

· Implants: Bone screws, intramedullary nails, joint stems

· Instruments: High-torque tools, durable shafts

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Operating Voltage
20–100V
Color Options
Blue, gold, green, black, natural
Processing Time
10–25 minutes
Compatible Materials
Ti-6Al-4V, Ti-6Al-4V ELI

8. TiN Coating

Process Introduction

TiN (Titanium Nitride) coating is a hard PVD ceramic coating that provides excellent wear resistance, low friction and high hardness, widely used to extend the service life of orthopedic instruments.

Technical Specifications

Parameter
Specification
Coating Thickness
1–5 μm

Typical Orthopedic Applications

· Implants: Reusable drills, taps, reamers, forceps, osteotomes

· Instruments: High-wear auxiliary implant components

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Hardness
HV 1800–2200
Color
Golden yellow
Adhesion Strength
≥50 MPa
Friction Coefficient
0.4–0.6

9. DLC Coating

Process Introduction

DLC (Diamond-Like Carbon) coating offers ultra-low friction, high hardness and excellent biocompatibility, ideal for articulating implant surfaces and wear-prone surgical instruments.

Technical Specifications

Parameter
Specification
Coating Thickness
1–3 μm

Typical Orthopedic Applications

· Implants: Joint articulating surfaces, spinal implant sliding parts

· Instruments: High-wear minimally invasive tools, sliding components

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Hardness
HV 2000–3000
Friction Coefficient
≤0.2
Operating Temperature
100–200°C
Corrosion Resistance
Excellent corrosion resistance for orthopedic physiological environments

10. Electroplating

Process Introduction

Medical-grade electroplating deposits a thin metal layer to improve surface hardness, corrosion resistance, conductivity and appearance, complying with ISO 13485 for orthopedic devices.

Technical Specifications

Parameter
Specification
Common Plating Types
Gold plating, nickel plating, chrome plating

Typical Orthopedic Applications

· Implants: Conductive surgical tools, corrosion-resistant clips

· Instruments: Low-current conductive components, marker parts

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Coating Thickness
0.5–5 μm
Current Density
2–10 A/dm²
Adhesion
Strong, no peeling or chipping
Compatible Materials
Stainless steel, brass, titanium alloys

Medical-Grade Surface Treatment

Post Finishing Quality Assurance

· Full-process post-finishing coverage: from surface treatment, coating and cleaning to final traceability marking

· Advanced inspection for surface roughness, coating thickness and dimensional accuracy using CMM and profilometers

· Strict batch traceability and process record management in compliance with ISO 13485

· Professional post-finishing engineering team with extensive experience in orthopedic medical device manufacturing

Get A Quote

If you have requirements for precision machining, prototyping or small batch production of orthopedic implants and instruments, please feel free to send us your drawings and specifications.We will provide you with a professional quotation and solution within 24 hours.

CONTACT US

Tel: +86 18718750572

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Email: enquiry@honlike.com.cn

WhatsApp: +86 18718750572

101-103, Building 8, Bay Area Intelligence Valley, West District, Zhongshan, 528411, GuangDong, China

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