Electrochemical testing for corrosion analysis

A test stand for testing electrochemical response of a sample, comprising:

• a test chamber;
• an electrolyte disposed within the test chamber, wherein the sample is configured to be at least partially disposed within the electrolyte;
• a macro potentiostat, operatively connected to the sample and the electrolyte, and configured to:
• apply a first range of macro potential between the electrolyte and the entire sample, and measure a first range of macro current between the electrolyte and the entire sample, while subject to the first range of macro potential, wherein applying the first range of macro potential includes sweeping continuously through the first range;
• hold at a first fixed macro potential within the first range of macro potential;
• apply a second range of macro potential between the electrolyte and the entire sample, and measure a second range of macro current between the electrolyte and the entire sample, while subject to the second range of macro potential, wherein applying the second range of macro potential includes sweeping continuously through the second range;
• and
• hold at a second fixed macro potential within the second range of macro potential;
• a micro potentiostat configured to be movably disposed relative to at least one surface portion of the sample, and configured to:
• measure a plurality of first micro currents at a plurality of individual points of the surface portion of the sample, while the macro potentiostat is held at the first fixed macro potential;
• measure a plurality of second micro currents at a plurality of individual points of the surface portion of the sample, while the macro potentiostat is held at the second fixed macro potential;
• and
• a control system configured to operate the macro potentiostat and the micro potentiostat.