Description
Run the Critical Pitting Temperature standard technique by selecting Experiment > Critical Pitting Temperature > Critical Pitting Temperature from the Framework™ menu bar. This initiates the following sequence of events:
1.Framework™ creates a Runner window, and the Critical Pitting Temperature.exp script is run in this window.
2.The script creates the Setup dialog box and accepts 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. The file header information is written to the data file. This information is written to the file prior to data acquisition. If the experiment is aborted, the file contains only this information. This header information includes:
•Tags identifying possible analyses.
•The current time and date.
•A list of the Setup parameters.
4.The script conditions the electrode if Conditioning was specified in the Setup. Conditioning is done by applying a fixed potential for a defined time. It establishes a known surface state on the corrosion specimen. A plot of current versus time is displayed during the Conditioning.
5.The initial Open Circuit Delay is performed. This is done to establish Eoc at room temperature. The measurement lasts for 10 minutes.
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To modify the initial Open Circuit Delay, you must edit the CPT script file (*.exp) . |
6.The Start Temperature is sent to the temperature controller. The script then enters a loop in which it continuously reads the current cell temperature until the cell reaches the set-point.
7.Once the cell gets to the set temperature, the script runs an Open Circuit Delay for the duration specified during Setup.
8.At this point, the actual data are acquired. The potentiostat sets the applied potential specified during Setup and begins acquiring current-versus-time data. Data are acquired for the time specified in the Run Duration field of the Setup dialog box, or until the current reaches the current limit. In either case the scan terminates and the script writes the data to the data file.
9.If the data acquisition ended because the current exceeded the current limit, the script terminates. If the current did not exceed the limit, the script sets a new temperature and returns to Step 6. If the new temperature exceeds the Final Temperature parameter, the script terminates.