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Chemical Passivation Services for Corrosion Resistance
Passivation is a critical non-electrolytic chemical treatment used primarily for stainless steel. During machining, microscopic particles of free iron from cutting tools can embed themselves into the surface of the part. If left untreated, these particles will rust, compromising the integrity and hygiene of the component.
JUCHENG provides professional passivation services designed to remove these surface contaminants and enhance the formation of the natural passive oxide layer. By immersing parts in specialized acid solutions, we ensure your components meet strict ASTM A967 and AMS 2700 standards. This process is essential for parts destined for the medical, pharmaceutical, aerospace, and food processing industries where cleanliness and longevity are paramount.
Passivation

JUCHENG’s Passivation Capabilities

We offer tailored chemical treatments based on alloy type and industry requirements:
  • Citric Acid Passivation: An eco-friendly, biodegradable process. It is highly effective for a wide range of stainless steels and is gaining popularity for its safety and speed.
  • Nitric Acid Passivation: The traditional method offering powerful oxidation. Ideal for certain aerospace applications and older specifications that strictly require nitric acid.
  • Ultrasonic Cleaning: Before passivation, we subject all parts to rigorous ultrasonic cleaning to remove cutting oils and debris, ensuring the acid can reach the metal surface evenly.
  • Verification Testing: We verify the success of the process using Copper Sulfate testing, Ferroxyl testing, or Water Immersion tests to guarantee no free iron remains.
Passivated Stainless Steel

Product Gallery Categories

Medical Device Components
Medical Device Components
Sanitary Food Fittings
Food Processing Valves
Aerospace Hardware
Aerospace Fittings
The Passivation Process
Citric Nitric Bath Process
Quality Verification
Copper Sulfate Test

Materials Available

Materials Requiring Passivation
Passivation is almost exclusively performed on corrosion-resistant alloys:
Material Family Why Passivate?
Stainless Steel 304/316 Standard Practice. Removes iron contamination from machining to prevent "tea staining" rust spots. Essential for medical/food use.
Stainless Steel 17-4 PH Enhances the corrosion resistance of precipitation-hardening steel after heat treatment and machining.
Stainless Steel 400 Series These magnetic grades have lower natural corrosion resistance; passivation is critical to maximize their lifespan.
Titanium While naturally passive, chemical cleaning (pickling/passivation) removes surface impurities and alpha case from processing.

Comparison

Comparison: Passivation vs. Electropolishing vs. Pickling
Understanding the difference between cleaning processes:
Feature Passivation Electropolishing Pickling
Primary Goal Remove Free Iron Improve Surface Finish Remove Weld Scale
Method Chemical Acid Bath Electrochemical Aggressive Acid
Material Removal Negligible (Surface only) Yes (Micro-layer) Yes (Surface layer)
Visual Change None (Part looks the same) Bright / Shiny Matte / Dull Grey
Surface Smoothness No Change Improves (Lowers Ra) Slightly Roughens
Cost Low High Medium

Why Choose Us

  • No Dimensional Change: Unlike plating or electropolishing, our passivation process removes iron at the molecular level without altering critical machining tolerances. Your part fits exactly as designed.
  • Standard Compliance: We process parts in strict accordance with ASTM A967 and QQ-P-35 specifications, providing certificates of compliance (CoC) upon request.
  • Cleanliness: Post-passivation, parts are rinsed with deionized water and dried in a clean environment to prevent water spots or re-contamination.
  • Integrated Workflow: We machine and passivate under one roof, reducing lead times compared to outsourcing to a finishing house.

Advantages

  •  Rust Prevention: Eliminates "rouge" or surface rust caused by embedded tool steel particles.
  • Extended Lifespan: Restores the steel's natural ability to form a chromium oxide passive film, protecting it from the environment.
  • Cleanliness: Removes surface oils and shop dirt, making parts suitable for high-purity applications.
  • Cosmetics: Maintains the natural look of the metal without adding a coating that could chip or peel. 

Industries Served

  • Medical & Dental: Surgical instruments, dental implants, autoclave trays.
  • Food & Beverage: Mixing blades, dispensing nozzles, brewery fittings.
  • Aerospace: Fuel system components, fasteners, actuators.
  • Pharmaceutical: Pill press tooling, fluid handling manifolds.
  • Semiconductor: Vacuum chamber components requiring ultra-clean surfaces.
Jucheng Precision Factory
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    Factory Address :
    Shenzhen: Fourth Industrial Zone, Xisha Road, Shajing Street, Baoan District, Shenzhen.
    Dongguan: Building 5 and 4, No. 198, Chang'an Section, Guanchang Road, Chang'an Town, Dongguan.
     
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    unit 1, Enterprise City,Durham DL16 6JF, united Kindom
     
     
    +86 - 186 - 8005 - 3076
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