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Auger Electron Spectroscopy Analysis of Pit Initiation at MnS Nano-inclusions in Carbon Steel

Cold rolled carbon steel is a commonly used structural material in a wide variety of applications, including automotive, building construction, appliances, and even fuel storage tanks for naval ships. Although Mn is purposely added to carbon steel to getter problematic S impurities, it has long been postulated that MnS inclusions in carbon steel can act as sites of pitting initiation [1]. The propagation of pitting corrosion is relatively well understood; however, the initiation of pits is still a subject of controversy [2, 3]. A careful study of pit initiation and propagation associated with sulfide inclusions has been lacking, partly because these inclusions are mostly submicron-sized and the evolution of their corrosion is difficult to monitor. An extremely small spectroscopic probe technique, such as Auger Electron Spectroscopy, capable of nanometer-scale resolution, is required to analyze and map out the elemental distributions within these submicron pits. Auger also has the surface sensitivity needed to detect very thin layers of contaminants associated with these surface-related phenomena.