Corrosion Behavior Experimental Sequence

Run the Corrosion Behavior Diagram standard technique by selecting Experiment> Named Script…, from the Framework™ menu bar. This opens the Select a Script to Run window, in which you scroll through to find Corrosion Behavior Diagram.exp. Click the Open button. This initiates the following sequence of events:

1. The Framework creates a runner window, and the Corrosion Behavior Diagram.exp script is run in this window.
2. The script creates the Setup dialog box and allows changes in the experimental parameters.
3. The script now obtains the use of the potentiostat specified during Setup, and opens the data file using the Output Name. If the potentiostat is in use or the file cannot be opened, the script returns you to the Setup dialog box.
4. The file header information is written to the data file. This header information includes:
   1. Tags identifying possible analyses
   2. The current time and date
   3. A list of the Setup parameters

5. Immediately after immersing the sample, a rapid anodic-going initial scan is recorded. The starting point for this scan is a potential where a large cathodic current (on the order of 10 mA) is passed. This anodic-going scan is continued until a set anodic current (about 1 mA) is reached, or a limit potential is reached. At this point the scan is reversed, and data are recorded all the way back to the original starting potential.
6. The scan is really a staircase ramp, with a current value recorded at the end of each step in the staircase. At each point, the current range is automatically switched to the optimal range for the measured cell current. If IR-compensation has been selected, each potential is corrected for the measured IR drop of the preceding point. A plot of log(I) vs. E is displayed during the scan.
7. Following this first scan, the specimen is open-circuited and Eoc is allowed to drift for about 10 minutes, or until it stabilizes. A value for Eoc is recorded.
8. A third scan acquiring data is then performed. It starts at Eoc and proceeds in a cathodic direction to the starting potential for the cyclic scan. A plot of log(I) vs. E is displayed during the scan.