Unlike hard chrome plating, TDC is engineered for tight-tolerance parts with minimal dimensional change and, depending on the texture, emphasizes reduced microcracking and improved wear/corrosion behavior. Moreover, hard chrome often requires post machining processes whereas thin dense chrome avoids the extra time and cost altogether.
Armoloy Coatings
Armoloy Coatings
Thin Dense Chrome
Engineered chromium coatings for wear, friction, and corrosion control
Armoloy Coatings
What is Thin Dense Chrome?
Thin Dense Chrome (TDC) is a family of engineered chromium coatings applied through a controlled electroplating process to improve surface performance without altering part dimensions.
Unlike decorative chrome finishes designed primarily for appearance, or conventional hard chrome focused on heavy buildup, Thin Dense Chrome is engineered for precision functional applications requiring controlled surface performance on industrial components.
Thin Dense Chrome deposits a dense, uniform chromium layer at low thickness — typically 0.00005” to 0.001” (1.27 to 25.4 µm). At these levels, TDC delivers high hardness, low surface friction, strong adhesion, and enhanced wear performance while maintaining tight dimensional tolerances.
Details About Armoloy Thin Dense Chrome
Originally developed by Armoloy in the late 1950s as a functional alternative to thick hard chrome plating, thin dense chrome has evolved into structural variations for different operating environments. The two primary surface structures — micronodular and microcracked — produce distinct surface behavior and are selected based on wear, corrosion, and lubrication demands.
All Armoloy TDC coatings share the same zero valence chromium foundation, but variations in structure and processing create different performance characteristics. In addition to these two surface types, TDC can be combined with nickel layers or advanced surface technologies to form hybrid coatings for specialized environments.
Thin Dense Chrome therefore refers not to a single coating, but to a family of chromium surface solutions engineered for different requirements. Armoloy’s TDC coatings represent one of the most established and technically refined evolutions of this technology.
Explore TDC Coatings
Services at Armoloy
The Armoloy Corporation is here to provide support for your project, starting from the discovery phase and continuing through a successful production launch. Whether coatings are considered during the initial part design phase or become necessary due to product failures in the field, our team can assist you at any stage in the process.
Research & Development
Fully equipped R&D plating lab for test runs, prototyping, and continual development of our plating technologies. Our turnkey approach ensures high-quality outcomes for your project.
Process Development & Validation
Support from design to product launch with coating selection, prototyping, testing, PPAP validation, and plating production on any scale. We also support a range of ASTM and AMS test methods with a NADCAP-certified laboratory.
Fulfillment
The Armoloy Corporation ensures the development of a repeatable thin dense chrome plating process that can be achieved at any one of our process fulfillment centers around the world. We will handle prototyping, process validation, cost engineering, and much more.
Qualifications
Specifications
AMS2438 Specification SAE Plating, Chromium Thin, Hard, Dense Deposit
AMS2406 Specification SAE Chromium Plating (Electrodeposited)
Specification SAE AMS2460, Specification SAE Plating, Chromium
Process Specification No. 180 Nodular Thin Dense Chromium (NTDC) Plating
ASTM B650 Standard Specification for Electrodeposited Engineering Chromium Coatings on Ferrous Substrates
Honeywell GPS3116-1H Plating, Specialized
Fisher FFS 2E1 Chromium Coating for Service to 1100F(593C)
MIL-DTL-23422 Military Specification, Chromium Plating, Electrodeposited
ASTM D4060 Standard Test Method for Abrasion Resistance of Organic Coatings by the Taber Abraser
ASTM B578 Standard Test Method for Microhardness of Electroplated Coatings
Specification SAE AMS 2407, Plating, Chromium, Porous
ASTM F519 Hydrogen Embrittlement Relief
Adding Value. Developing Solutions.
With over 65 years of experience, The Armoloy Corporation helps global manufacturers protect their most valuable metal assets with a premium lineup of TDC coatings.
Looking for more metal surface treatments to explore? Armoloy’s nickel coatings eliminate and prevent wear and corrosion across a wide range of industrial applications with multiple nickel coating products. By increasing the longevity of metal surface applications, Armoloy helps to ensure that organizations avoid unplanned downtime and maintain peak efficiency and performance.
Frequently Asked Questions
Armoloy provides Nodular TDC, Microcracked TDC (Electrolizing®), XADC® (nano-diamond co-deposit), and hybrids like Bi-Protec (EN+TDC/XADC) and Gullon (TDC + solid-film lubricant) to target specific wear, friction, and corrosion profiles.
Armoloy TDC reaches about 72–78 Rc (depending on variant and process), enabling excellent sliding and abrasive wear resistance. Armoloy nodular thin dense chrome can exceed 78 Rc but the average is typically 78 Rc.
Both—Armoloy’s TDC reduces wear, friction, and corrosion; nodular TDC in particular is positioned for corrosion mitigation alongside low friction.
Armoloy documents USDA approved/FDA-compliant claims with supporting biocompatibility notes (USP/REACH/RoHS context) for TDC variants used in regulated environments. (Confirm clause-level requirements during quoting.)
TDC produces a uniform matte finish by default; appearance options (e.g., matte, satin, non-reflective) are available with Microcracked TDC.
Yes—Armoloy offers a Microcracked TDC for Aluminum (AL-COAT) option designed for aluminum alloys while maintaining thin, dense deposits.
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