Abstract
Polished samples of Cu, Zn and two brasses (CuZn10 and CuZn30) have been treated in synthetic air with 80% relative humidity (RH) and alternatively with 250 ppb SO2 added to the moist air stream in a weathering box. Depth profiles of the corroded surfaces were made with dynamic-SIMS and the courses of the S- and O-signals were traced. The decay of the S- and the O-signal exhibited different behavior. While the O-signal decreased continuously through the corroded layer, the S-signal decreased much faster until it reached the background level at the half of the thickness of the altered layer. Surface features could be found with comparative TM-AFM-measurements that confirmed these SIMS results. The height of these features (measured with TM-AFM) matched with the determined thickness of the S enriched layer.
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Acknowledgment
This work was financially supported by the Austrian Fund for Science and Research (FWF Project No. P 13160).