Sub-surface corrosion research on rock bolt system, perforated SS sheets and steel sets for the Yucca Mountain Repository — Quarterly technical report No. 11

This report shows the work done for this period in accordance to cooperative agreement of University of Nevada system for the Task 019 “Subsurface Corrosion Research on Rock Bolt System, Perforated SS Sheets and Steel Sets for the Yucca Mountain Repository”, the overall objective of which is to conduct corrosion research and predict the durability of rock-bolts and other underground metallic roof supports. We are performing oxidation tests using Thermogravimetric Analyzer (TGA), and Potentiodynamic and immersion tests to determine the corrosion rates of rock bolts. In this quarter: Potentiodynamic tests were performed to determine corrosion rates (CR) of 4340 Steel in 1X, 10X (repeated ) 100X YM waters at several temperatures in deaerated condition. EIS studies were performed on the 4340 steel at 10X and 100x YM electrolyte. The TGA had to be recalibrated and the anomalies of the modulated data for oxidation studies were performed for determination of accuracy of the data. One Met Trans A. Paper is in print 2007 (this was submitted in 2006), One Paper presented at NACE Conference in Florida 2007