New, high-tech way to protect ancient silver

Published on October 28th, 2010 | by Admin


Scientists have developed a new, high-tech way to protect silver from tarnish, a huge threat to many museum artifacts.

To protect these objects for generations to come, scientists from the A. James Clark School of Engineering at the University of Maryland, College Park, have teamed up with conservators from the Walters Art Museum in Baltimore, Md., to develop and test a new, high-tech way to protect silver art objects and artifacts, using coatings that are mere nanometers thick.

The technique, called atomic layer deposition (ALD), will be used to create nanometer-thick, metal oxide films which, when applied to an artifact, are both transparent and optimized to reduce the rate of silver corrosion. The films are created when an object is exposed to two or more gases that react with its surface.

“ALD gives us an exquisite level of control, literally at the atomic level,” says Ray Phaneuf, a professor of materials science and engineering (MSE) working on the project. “It’s an effective, low-cost strategy to reduce corrosion that preserves artifact appearance and composition while complying with the rigorous standards of art conservation practice.”

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