Chrome oxide coating

hard chrome and thermal sprayed coating alternatives comparison graphIn the production of hard chromium plating hexavalent chromium oxide is produced. Hex chrome is a well known carcinogen. Industries that generate hex chrome currently face strict occupational and environmental regulations, and the regulations for hex chrome are expected to become more restrictive. Because of the strict regulations for hex chrome the cost of hard chrome plating continues to rise and the availability of the technology is becoming harder to find as older plating operations are being shut down.

Hard Chrome Alternatives

TST offers several alternatives to replace hard chrome plating.

Because TST custom engineers its coating solutions to each of our customer's component surface requirements, many of the coatings outperform the hard chrome plated coating they replaced. The coatings are typically designed to provide protection against wear, corrosion and many times a combination of both.

Coating Materials

landing gear hard chromium plating replacementFigure 1 is a comparison of some of the alternative coating materials offered by TST to replace hard chrome plating. These coatings were tested along with hard chrome in an ASTM G65 Abrasive Sand Rubber Wheel wear test. This test demonstrates alternatives to hard chrome plating can clearly outperform the coatings they were designed to replace.

Examples

Thermal sprayed coating alternatives to hard chrome plating are becoming very common. An application example is the use of thermal sprayed carbide coatings on landing gear for aircraft. These coatings have proven to provide exceptional wear and corrosion resistance in this application.

Thermal Spray Coated Landing Gear Struts Replace Hard Chromium Plating
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