Abstract
Low-pressure hydrogen gas plasma reduction has been used at the Swiss National Museum in metals conservation since 1990. After a critical re-evaluation of the method in 1994, major changes were introduced. Today, it has become an integral part of the conservation procedures for archaeological iron. Its major advantages are improved mechanical cleaning and speeding up of the subsequent desalination process with alkaline sulphite. This study focuses on the changes that have been introduced to the plasma apparatus as well as on the treatment parameters, such as temperature, time, and gas mixture. All of these improvements aim at preserving the integrity of the artifact.
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