Pure chromium metal provides high light reflection and accepts a high polish. In the pure state it is ductile; the introduction of impurities can result in embrittlement. Due to its high light reflection property and corrosion resistance, chromium is heavily used in plating applications. Depending on the process, chromium plating can be expensive and difficult.

Chromium plating is a multi-step reduction accomplished by the electrolytic reduction of dichromate in a sulfuric acid solution. Due to microscopic flaws, chromium plating is used with copper and nickel substrates to protect the item being plated. There are some 100 different types of chrome on the market. Chromium is also used in applications where high hardness values are required. Plated on polished metals, chromium affords a smooth surface that suits it to decorative or wear-resistant applications. Deposits can be as thin as 0.00002" for decorative applications or up to 0.050" thick in heavy wear uses. Among the types of chromium alloys used for high hardness and wear resistance applications is 1% molybdenum with chromium.

Chromized Steel is produced by coating steel with chromium through a diffusion process. Deposited chromium combines with iron, which is different than plating. Less chromium penetration is obtained on high-carbon steel but the coating is harder.

Armoloy TDC (Thin Dense Chromium) is a low-temperature, multi-state finishing process based on chromium plating technology. It is a process developed by Armoloy of Connecticut, Inc. in which a 99% pure chromium coating permeates the microscopic surface of metals, creating a 100% bonding characteristic that will not allow chipping, flaking or separation from the base metal. This coating conforms to existing metal surfaces in detail to create a hard, slippery and corrosion-resistant surface.

The micro-modular finish of Armoloy TDC creates point-to-point contact areas that reduce surface contact and friction. For increased lubricity without galling, products treated with this coating can be used in applications that involve sliding, turning or moving. Metals that can be coated are tool steels, cold/hot rolled steel, bearing grade steels, cast iron, stainless steel, bronze, Inconel, beryllium, copper and brass. Applications include nuclear components, valves, guides, pistons, gears, splines and machine tool components.

Inconel is a registered trademark of Inco Alloys International, Inc.

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