Armoloy TDC

Armoloy TDC is a low temperature, multi-stage metal finishing process improved from chrome-plating technology. Unlike conventional chrome-plating processes, Armoloy TDC utilizes proprietary chemical solutions and unique application techniques that are carefully monitored to produce its TDC (Thin Dense Chromium) coating, which follows the exact contours of the basis metal with accurate deposit thicknesses.

Another important aspect of Armoloy TDC is the uniformity of deposit thickness of the coatings, which are typically applied at 1,0 to 17,5 microns (0.000040 to 0.0007 in.). Thinner coatings can be applied with higher degree of uniformity to a component with tight tolerances. The recommended deposit thickness range of 2,5 to 7,5 microns (0.0001 to 0.0003 in.) is uniform within +/- 0,625 microns (0.000025 in.). This allows Armoloy to return a finished product to its customer and eliminates the need for post-coating operations.

Armoloy TDC coatings have been applied to bearings, tools and dies, pumps, plastic and rubber mold tooling, hydraulics, food-processing equipment, and a wide variety of components where wear, abrasion, high friction and corrosive environments are prevalent.



  • 78Rc Surface Hardness
  • Reduced wear and corrosion resistance- protects against most organic and inorganic compounds except for sulfuric and hydrochloric acid.
  • Absolute adhesion to the basis metal- no chipping, cracking, flaking or peeling.
  • Improved release characteristics in plastics forming tools
  • Reduced maintenance and part replacement costs.
  • Increased Lubricity-
  • Withstand temperatures of -400’F to 1600’F. At elevated temperatures above 1200’F it will react with carbon monoxide, sulfur vapor and phosphorus. At bright red heat, oxidation occurs in steam or alkali hydroxide atmospheres. Hardness and wear resistance will be reduced to some degree at temperatures above 1200’F.
  • Has a unique Micro-Nodular characteristic that aids in Lubricant retention and reduces surface contact area. This coupled with the inherent lubricity of chromium results in lower coefficient of static and sliding friction.
  • Pre- and post-baking are available upon request or specification to aid in the prevention of hydrogen embrittlement.
  • USDA approved and FDA compliant for use.
  • As the quality of the surface finish and hardness of the basis metal improves so does the performance of the Armoloy TDC coating.
  • Can be applied to all ferrous and nonferrous metals, but is not recommended for aluminum, titanium or magnesium. Armoloy makes it possible to use standard ferrous steels in place of stainless steel in many applications.

Key Properties of Armoloy TDC

Reduced wear from low friction coefficient of moving parts:

Armoloy TDC is a low friction coating due to special techniques used in its application. The low coefficient of friction is invaluable especially in situations where extreme temperatures are involved. Normal proven average deposits are in the .0001/.0003" per side range.

Enhanced corrosion resistance:

Armoloy TDC resists attacks by most organic and inorganic compounds with the exception of sulfuric and hydrochloric acids. Of course, base metal porosity, surface hardness and other imperfections affect basic corrosion-resistant properties. All basis metals with the Armoloy coating are enhanced. Conforms to ASTM-B117 and others.

Improved release characteristics:

Armoloy TDC helps reduce maintenance requirements and downtime in the mold industry due to the smooth, micro-nodular surface produced by the coating. This will lead to more shots and shorter cycle times. Molding areas stay cleaner longer and require less maintenance while burnt on plastic and rubber can be quickly removed.

Less hydrogen exposure:

Armoloy’s TDC unique processing and preprocess surface preparation minimizes parts' overall exposure to hydrogen, decreasing the chance of hydrogen embrittlement. (Original conditions may not be removed.)

Safety first:

With Armoloy’s TDC strength also comes safety. USDA/FSA compliant for us on food processing equipment and pharmaceutical applications.

    Additional properties include:

  • No chipping, cracking or peeling from the basis metal
  • Reduced maintenance and machinery replacement costs
  • Smoother, faster and quieter running equipment
  • 78Rc surface hardness
  • Vickers Diamond measurements produce a 1020-1100 hardness rating
  • Complies to AMS-2438a, AMS-2406 and QQ-C-320B, Class 2, Type II standards