PVD vs HARD CHROME
PVD (Physical Vapour Deposition) Coating on Paper Drill Bits
PVD vs HARD CHROME
The search for a suitable replacement to Hard Chrome has arisen because of the documented health risks to workers and the impact on the environment from exposure to hexavalent chromium, a carcinogen that occurs during the chrome plating process and the most toxic form of chromium. As a result, chromium is a highly regulated chemical in major markets worldwide. In the European Union, hexavalent chromium falls under the domain of the EU regulation, REACH (Registration, Evaluation, Authorization and Restriction of Chemicals), which establishes guidelines for the safe use of chemicals throughout the supply chain. Chromium is also closely regulated in the United States by OSHA.
This has presented an opportunity to achieve superior performance as replacements to Hard Chrome are evaluated. One alternative that is increasingly being utilized is PVD coatings, a strong non-hazardous, REACH-conforming replacement option to Hard Chrome.
PVD coatings offer many of the same benefits and, in some ways, are superior to Hard Chrome as there is no risk of pitting and spalling (flaking) under high stress conditions. It offers a stronger adhesion to metal substrates than Hard Chrome, a high load bearing capacity, and a high level of resistance to scuffing (adhesive wear), and because of its low friction coefficient, it reduces fretting corrosion. This makes the coating ideal for dry running applications.
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