Wholesale Chromic Acid Anodizing Manufacturer & Factory

Mil-A-8625 Type I Protective Coating, Precision Metal Fabrication & Surface Finishing Solutions Since 1996

Our Featured Capabilities & Products

High-precision metal fabrication and structural components, custom-finished to your performance specifications.

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Stamping & Deep Drawn Products

Deep Drawn Industrial Enclosures

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Aluminium Hot Forging

Heavy Duty Aluminum Hot Forging

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CNC Machined Precision Parts

High Precision Machined Parts

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Who We Are: Ningbo Jiangbei XinYe Metal Works Co., Ltd.

Established in 1996 as an owner-managed SME corporation, XinYe Metal has grown into a highly trusted manufacturer of precision metal components and surface finishings. Based in the Ningbo Jiangbei Industrial Zone, our modern facilities are located within a 3-hour high-speed rail network from Shanghai International Airport.

Our operation spans 16,000 square meters of production floor space with an additional 11,000 square meters under construction to support our capacity expansion. Supported by a skilled workforce of 130 professionals—including 80 dedicated production operators and 50 experts in product development, engineering, quality control, and administration—we offer tailored OEM and ODM services to global markets across Europe, North America, and Asia.

Our core capabilities range from CNC machining, aluminum hot forging, lost wax casting, and stamping to specialised chemical surface treatments such as Chromic Acid Anodizing (Type I) and electropolishing.

Xinye Metal Factory Floor & Facilities
1996
Established
16,000 m²
Production Floor
130+
Global Workers
20+
Technical Patents

Chromic Acid Anodizing (MIL-A-8625 Type I) in Aerospace & High-Performance Industries

Technical insight into why Type I Chromic Acid Anodizing remains the standard for critical aerospace and defense systems.

Understanding Chromic Acid Anodizing (CAA)

Chromic Acid Anodizing (CAA), specified under the international military standard MIL-A-8625 Type I (Class 1 & 2), generates a thin, ductile aluminum oxide barrier layer. Unlike Type II (Sulfuric Acid Anodizing) or Type III (Hard Anodizing), CAA films are significantly thinner, typically ranging from 0.5 to 2.5 microns (0.00002" to 0.0001").

This micro-thin structure offers unique advantages for critical engineering applications:

  • Preservation of Fatigue Strength: CAA does not degrade the cyclical fatigue limits of high-strength aerospace aluminum alloys (e.g., 2024, 7075).
  • No Acid Entrapment Risk: Chromic acid is non-corrosive to aluminum. If any electrolyte is trapped in complex assemblies, joints, or castings, it will not attack the metal structure.
  • Excellent Corrosion Resistance: Provides outstanding protection in marine and industrial environments, passing salt spray requirements per ASTM B117.
  • Critical Assembly Interface: Ideal for precision components with tight dimensional tolerances that cannot tolerate thick coatings.
Parameter MIL-A-8625 Type I (Chromic) MIL-A-8625 Type II (Sulfuric)
Film Thickness 0.5 – 2.5 µm 1.8 – 25 µm
Fatigue Limit Impact Negligible (0 to -5%) Significant (-15% to -30%)
Corrosion Resistance Excellent (336+ hrs salt spray) Excellent (336+ hrs salt spray)
Acid Entrapment Risk Non-destructive / Self-neutralizing Corrosive / High risk if trapped
Common Alloys Treated 2024, 7075, Cast Alloys 6061, 5052, 6063

Macro-Industry Solutions & Global Applications

Providing mission-critical surface finishes and component fabrication across diverse demanding sectors.

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Aerospace & Defense

Used on structural airframe components, landing gear components, hydraulic control assemblies, and transmission components where dimensional accuracy and fatigue retention are critical.

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Fire & Gas Detection

Custom enclosures, flame sensors, and explosive gas detectors for oil, gas, and mining industries that require spark-free, non-corrosive, and explosion-proof finishes.

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Automotive & E-Mobility

Lightweight transmission components, brake calipers, and custom-formed E-bike connectors and levers that require long-term resistance to environmental oxidation.

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Industrial Machinery

High-wear parts such as wood chipper cutter discs, feed rollers, and process equipment components requiring chemical resistance and surface passivation.

Advanced Manufacturing Infrastructure

Equipped with heavy-duty and high-precision production machinery to meet strict industrial specifications.

Hot Forging Fleet

Friction presses with pressing forces ranging from 300 to 1000 tons. Column hydraulic machines offering 100 to 630 tons of force for heavy-duty metal displacement.

CNC Machining Center

4-axis CNC machining, milling, and turning machines imported from Japan, capable of delivering tolerances down to 0.001mm.

Presses & Stamping

Punching press fleet with capacities from 5 to 250 tons, dedicated to high-speed progressive metal stamping and deep-drawn structures.

Video: Factory Tour & Production Capabilities

Video: CNC Precision Machinery in Action

Equipment & Workshop Showcase

Forging Line Operation
High-Speed Punching Press
Hydraulic Press Machinery
Tooling and Die Production
CNC Machining Center Workspace
Precision Metal Machining Process
Surface Treatment Lines
Finished Components Packaging

Localization, Safety & Environmental Stewardship

As a global supplier handling chemical surface processes, we are fully committed to sustainable, safe manufacturing. Chromic Acid solutions utilize hexavalent chromium, requiring strict environmental controls.

At XinYe, we maintain a fully enclosed, zero-discharge wastewater recycling system. Acid rinse streams are processed through ion-exchange and advanced evaporation technologies, preventing environmental runoff.

Furthermore, our materials conform to global directives including REACH and RoHS when requested by customers. For projects requiring alternative options, we support modern alternatives like Boric-Sulfuric Acid Anodizing (BSAA) and Trivalent Chromium Pre-treatments, ensuring seamless compliance across North American and European regulatory frameworks.

ISO 9001 Certificate
SA8000 Certification

Industrial Application Case Studies

Explore real-world applications of our precision fabrication and surface finishing solutions.

Industrial Components Case Study

Industrial Components

High-strength, precision structural parts designed for industrial machinery systems.

Material: Stainless Steel, Aluminum Alloy
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Automotive Transmission Components

Automotive Components

High-tolerance structural components for specialized automotive drivetrains.

Material: Stainless Steel, Aluminum Alloy
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Aerospace Fuel Hydrant Pit Box

Aerospace Industry

Aviation Fuel Hydrant Pit Box components, brackets, and transmission inlets.

Material: Aerospace Grade Alloys
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Wood Chipper Cutter Disc

Heavy Duty Rotors

Cutter discs and feed rollers engineered for heavy forestry machinery.

Material: Q345B, 42CrMo, NM400
View Details

Strict Quality Control & Inspection Infrastructure

Every process is verified and recorded, guaranteeing complete traceability from raw material to final assembly.

Quality is our core value. Our facilities are certified to ISO 9001:2015 and SA8000, ensuring high-quality products and safe, ethical manufacturing operations. Our dedicated quality department leverages advanced inspection equipment to guarantee mechanical and chemical compliance.

GNR Spectrum Analyzer

GNR Spectrum Analyzer

CMM Inspection Machine

CMM Inspection Machine

Video Measuring System

Video Measuring System

Roughness Meter

Roughness Meter

Spring Tension Machine

Spring Tension Testing

Our Process Workflow

From drawing verification and custom packaging to delivery, we guarantee precision at every stage.

Order Placement

1. Order Placement

Define specifications, transfer engineering models, and confirm pricing and delivery schedules.

Sample Production

2. Sample Production

Tooling design, alloy verification, prototype forging/machining, and inspection.

Customer Approval

3. Sample Approval

Deliver dimensional reports, chemical certificates, and finish test results to the customer.

Mass Production

4. Mass Production

Scale manufacturing under ISO-certified processes with integrated quality checks.

After-Sales & Assembly

5. After-Sales & Assembly

Dedicated final assembly, secure packaging, shipping, and a comprehensive 1-year warranty.

Dedicated Assembly & Packing Facility

To provide a complete manufacturing solution, we host a dedicated assembly workshop. Here, custom stampings, forgings, and machined components are integrated into sub-assemblies. This workflow reduces handling costs and simplifies logistics for our customers.

Our standard operational schedule is 16 hours per day, 6 days a week. To support urgent schedules, we can transition to a 24/7 continuous shift pattern within 30 days.

Xinye Assembly Workshop

Corporate Values & Collaborative Vision

We build reliable, long-term partnerships with our customers, employees, and suppliers.

Trust First

"Always comes first. Our priority and our responsibility is to exceed customer requirements and build long-term trust."

Responsibility

"We plan and execute every step carefully, delivering complete, high-quality solutions designed around our customers' needs."

Professionalism

"We commit our full dedication, expertise, and focus on continuous improvement to every component we fabricate."

Xinye Management Team Corporate Meeting Engineering Collaboration Technical Workshop
Modern Testing Room CNC Machining Line Factory Certificate Center

Technical Roadmap & Future Outlook

Ensuring global competitiveness through green alternatives and automated manufacturing processes.

Transition to Sustainable Surface Technologies

To address changing environmental regulations regarding hexavalent chromium (such as EU REACH regulations), our research and development team is continuously refining alternative passivation technologies.

Our focus includes scaling up Boric-Sulfuric Acid Anodizing (BSAA) processes, which provide similar corrosion protection and paint adhesion properties to traditional chromic acid coatings without the associated toxicity. We are also investing in automated chemical control lines to monitor bath concentration limits in real time. This optimization reduces chemical waste and maintains high consistency across production batches.

Smart Manufacturing & Automation

We are upgrading our machining and forging workshops to support IoT monitoring. By implementing real-time sensor tracking on our friction presses (300 to 1000 tons) and CNC systems, we can predict maintenance needs, reduce downtime, and improve dimensional accuracy on production runs.

Frequently Asked Questions

Technical and logistics answers regarding our manufacturing services.

What is the typical thickness of Chromic Acid Anodizing (Type I)?

Chromic Acid Anodizing (MIL-A-8625 Type I) generally produces a thickness between 0.5 and 2.5 microns (0.00002" to 0.0001"). This thin layer is ideal for components with tight tolerances and preserves the fatigue strength of high-strength alloys.

How does your factory manage environmental compliance for chromic acid?

We operate closed-loop wastewater recovery facilities. All chemical rinse streams are processed through an ion exchange and evaporation setup. We also offer REACH-compliant alternatives, such as Boric-Sulfuric Acid Anodizing (BSAA).

What is your average lead time for samples and production?

For custom samples, the lead time is approximately 7 days. For mass production, the typical lead time is 20 to 30 days following approval of samples and receipt of deposit.

Do you provide full quality documentation?

Yes, we supply complete quality documentation upon request, including Certificates of Analysis (COA), Certificates of Conformance (COC), dimensional inspection reports, and raw material certificates.

What is the minimum order quantity (MOQ)?

We require ongoing minimum order quantities for international orders. Please contact our engineering sales department with your specifications and requirements for detailed quotation information.

What payment methods do you accept?

We accept wire transfer (T/T), Western Union, and PayPal. Our standard terms are a 30% deposit in advance, with the remaining 70% balance paid against the copy of the Bill of Lading (B/L).

Explore Our Full Range of Services

High-quality components manufactured using advanced machinery and certified quality processes.

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