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A paramount issue impacting the performance, safety, and life extension of current light-water reactors is the environment-induced cracking of metallic structural components. Understanding their structure and chemistry, as well as how they react to various aqueous environments, is important to determining their real-world behavior. Metallography is one of the tools in determining microstructure. Using a light etching technique, the crystallographic orientation of the metal can easily be observed. This scanning electron microscopy image taken in backscatter mode illustrates how crystallographic pits are formed on the metal surface when exposed to acid. Imagery provided by Matthew Olszta. Other contributors are Robert Seffens, Clyde Chamberlin, Mychailo Toloczko and Stephen Bruemmer. Image colored by graphic designer Jeff London.

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Document Title: Acid Etched Nickel Base Weld Metal
Category: Chemistry, Materials Science
Media Type: Photos
Date of Image/Photo: October 2011
Background:
URL of this page: http://picturethis.pnl.gov/picturet.nsf/by+id/DRAE-8MJS2A

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