Metal Finishing Laboratory Testing & Coating Performance Validation

Precision laboratory testing and quality assurance services to verify coating integrity, adhesion, hardness, corrosion resistance, and surface performance for specification-driven components.

tESTING CAPABILITIES & QUALITY ASSURANCE ADVANTAGES

MIL operates a comprehensive metal finishing testing laboratory designed to validate that coatings and surface treatments meet the performance requirements of aerospace, medical, commercial, defense, and industrial applications. Our test methods evaluate coating durability, adhesion, corrosion resistance, thickness, conductivity, surface cleanliness, and environmental performance.

Spec & Capability Highlights

  • Nadcap-accredited and prime-approved testing procedures
  • Full suite of coating performance tests: adhesion, hardness, corrosion, abrasion, conductivity, roughness, and seal integrity
  • Supports anodize, chem film, cadmium plating, black oxide, phosphate coatings, and other metal finishing processes
  • Destructive and non-destructive testing options
  • Testing aligned with MIL-spec, AMS, ASTM, and prime requirements

EXPLORE OUR COATING PROCESSES

MIL offers one of the industry’s widest ranges of coating and metal finishing tests to ensure specification compliance and surface performance reliability.

Coating & Surface Integrity Tests

Coating Thickness Testing

Measures coating thickness to verify compliance with specification limits and ensure consistent performance without over- or under-application.

Coating Weight Testing

Determines coating mass per surface area to validate process control and adherence to coating specification requirements.

Copper Sulfate Testing (Passivity Test)

Detects free iron contamination on stainless steel surfaces to confirm effective passivation.

Cross Hatch Adhesion Test

Evaluates coating adhesion by cutting a grid pattern and assessing bond integrity after tape removal.

Dry Tape Adhesion Test

Assesses coating adhesion using pressure-sensitive tape to verify proper bonding to the substrate.

Wet Tape Adhesion Test

Tests coating adhesion under moisture exposure to ensure durability in humid or wet environments.

Dye Spot Test (Anodize Seal Integrity)

Verifies anodize seal quality by evaluating dye absorption behavior in sealed anodized surfaces.

Pencil Hardness Test

Determines surface hardness and scratch resistance of coatings using graded pencil leads.

Gloss Measurement

Measures surface reflectivity to verify cosmetic appearance and consistency with specification requirements.

Corrosion & Environmental Performance Tests

Salt Fog Testing

Accelerated corrosion testing that evaluates coating performance under prolonged salt spray exposure.

Humidity Testing

Assesses corrosion resistance and surface stability under controlled high-humidity conditions.

Oxalic Acid Spot Test (Black Oxide Integrity)

Confirms black oxide coating integrity by evaluating resistance to acid attack.

Taber Abrasion Test

Measures coating wear resistance by subjecting surfaces to controlled abrasive cycles.

Electrical & Conductivity Tests

Electrical Resistance (Chem Film)

Verifies that chemical conversion coatings meet electrical resistivity limits required by specification.

Hi-Pot Resistance Testing

Evaluates electrical insulation integrity by applying high voltage to detect leakage or breakdown.

Surface Conductivity & Contact Resistance

Measures electrical conductivity across coated or treated surfaces to ensure functional performance.

Surface Cleanliness & Contamination Tests

Ferroxyl Test (Passivation Validation)

Detects iron contamination on stainless steel surfaces to confirm passivation effectiveness.

Surface Roughness / Profilometer Measurement

Quantifies surface texture and roughness to verify finish quality and dimensional consistency.

Solvent Resistance Tests

Evaluates coating durability by exposing surfaces to solvents to assess softening, swelling, or degradation.

How laboratory testing Works

Step 1 — Test Method Selection

Parts and test panels are reviewed to determine the correct destructive or non-destructive test methods required by specification, prime standards, or customer requirements.

Step 2 — Controlled Test Execution

Each test is performed using calibrated instruments and controlled environments to ensure repeatability, accuracy, and compliance with MIL-spec, AMS, or ASTM procedures.

Step 3 — Evaluation & Results Interpretation

Technicians evaluate coating adhesion, corrosion behavior, hardness, thickness, conductivity, roughness, seal quality, or environmental resistance based on test results.

Step 4 — Documentation & Certification

Results are recorded and certified for quality assurance, traceability, and conformance reporting.

Why Work With MIL for metal finishing laboratory testing?

Spec-Driven Expertise

Our laboratory operates with strict adherence to MIL-spec, AMS, ASTM, and prime standards, providing accurate validation for aerospace coating testing, medical surface performance, and high-reliability components.

Reliable, Repeatable Measurements

Calibrated testing equipment, controlled environments, and highly trained technicians ensure confidence in the results used for coating performance evaluation and process control.

Integrated Testing & Processing Workflow

Metal finishing, coating, NDT, and marking are performed in the same facility as laboratory testing—reducing turnaround time, improving coordination, and ensuring thorough quality oversight.

Risk Reduction for High-Stakes Components

Laboratory testing helps identify adhesion failures, improper sealing, contamination, corrosion risks, and other defects before parts enter service, reducing scrap risk and improving long-term reliability.

Applications & Industries Served

Component Types

  • Anodized, plated, passivated, and coated components
  • Precision machined parts and assemblies
  • Aerospace hardware and sensitive flight components
  • Medical devices and instruments
  • Components requiring corrosion resistance, adhesion strength, or coating hardness testing

Industries

  • Aerospace & defense
  • Medical device manufacturing
  • Commercial and industrial equipment
  • Space systems
  • R&D, prototype, and low-volume precision production

FAQs

MIL offers one of the broadest suites of coating performance tests in the industry, including adhesion, corrosion, hardness, seal integrity, conductivity, surface roughness, coating weight, coating thickness, and environmental durability testing.
The appropriate test depends on the coating and specification:

  • Anodize: dye spot, seal integrity, thickness, corrosion resistance
  • Chem film: electrical resistance, corrosion resistance, adhesion
  • Cadmium plating: thickness, salt fog, adhesion
  • Black oxide: oxalic acid spot test, corrosion verification
  • Phosphate: weight, adhesion, corrosion resistance
    Our engineering team can review your specification and determine the exact test or combination of tests required.

Yes. All testing is performed in accordance with the relevant MIL-SPEC, AMS, ASTM, or prime contractor requirements.
MIL maintains Nadcap accreditation, prime approvals, ISO certification, and strict process controls across all laboratory testing functions.
Every test is executed using calibrated equipment, validated procedures, and traceable documentation to ensure aerospace- and defense-level compliance.

Many tests—such as adhesion, coating weight, oxide integrity, and Taber abrasion—are inherently destructive and must be performed on test panels or sacrificial parts.
When destructive testing is required, MIL:

  • Works with customers to supply representative panels or sample parts
  • Performs destructive evaluation only on designated items
  • Ensures the production lot is unaffected
    Non-destructive options (e.g., thickness measurement, gloss, electrical resistance, profilometry) can be performed directly on production components when allowable by specification.

Turnaround times vary by test type:

  • Adhesion, hardness, resistance, and roughness tests: typically fast-turn
  • Humidity and environmental exposure tests: 24–120 hours depending on spec
  • Salt fog testing: duration is spec-driven and often ranges 24–168 hours

MIL can accelerate testing for prototypes or urgent aerospace timelines when possible. Test duration itself cannot be shortened, but scheduling, handling, and reporting can be expedited.

Environmental tests—such as humidity, salt fog, solvent resistance, and corrosion evaluation—simulate real-world conditions the part will experience.
These methods reveal:

  • Coating breakdown or premature corrosion
  • Seal failures in anodize
  • Adhesion loss under moisture
  • Wear or abrasion issues
  • Surface contamination or improper pre-treatment

MIL’s test results confirm whether the coating will maintain performance, durability, and corrosion resistance under mission-critical environmental conditions.

Yes. MIL regularly tests coatings and finishes on complex geometries and specialty alloys, including titanium, stainless steel, Inconel, aluminum, and hardened steels.
We support:

  • Titanium and nickel alloy components
  • Precision medical instruments
  • Aerospace hardware and flight assemblies
  • Power generation components exposed to heat and corrosion
    If a test requires destructive evaluation, we coordinate representative parts or panels to maintain production part integrity.

MIL’s laboratory is fully integrated with our metal finishing, coating, NDT, and marking departments—allowing for seamless quality assurance and rapid feedback loops.
This integration provides several advantages:

  • Immediate verification of process effectiveness
  • Faster turnaround due to no external lab shipping
  • Reduced handling risk
  • Direct communication between technicians and finishing specialists
  • Full traceability from processing to testing

 

This unified workflow ensures that every component meets the spec requirements before it leaves the building.

Request a Quote or Speak with a Coating Specialist

Receive fast, accurate quoting for coating performance testing and laboratory validation services.

Not sure which test method you need? Need help interpreting a coating or finishing specification? Our technical experts can help determine the appropriate testing approach.

When Your Parts Carry Risk, We Carry the Load. 82 Years of Flight-Critical Confidence.

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