Inhibitors Studies Bubble Tests- Gill 6,8,12 ACM Instruments - Kulim Kht

Typical results are shown as metal has the highest corrosion rate but on the addition of the inhibitor the rate drops to the lowest. The test should be repeated at least three times and the results compared for scatter. The percentage protection of an inhibitor is usually quoted this is defined as 100*(uninhibited rate-inhibited rate)/uninhibited rate. The bubble test software will display this for all channels under test. The temperature of the test is important as a whole set of percentage protection values is displayed with respect to temperature.

Bubble Test facilitates running tests in multiples; tests are set up using a simple Bubble Wizard, a series of LPR tests are collected over time giving Corrosion Rate results. Results can be printed at the end in many ways including tables, lines and bar graphs. Cells (or Channels) are assigned together into Groups, each group has an Add Inhibitor button, once pressed, end corrosion rates can be calculated at the end of the test over 3 periods – prior to Add Inhibitor, after 2 hours and after 16 hours, this enables Percentage Protection to be calculated.

Bubble Test - LPR - Inhibitors Gill 6,8,12 ACM Instruments Kulim Kht

Testing of these chemicals is performed by makers and users. Makers set up initial screening to not reject any potential good ones. Users set up initial screening to reject any potential bad ones. Test metal should be the same metal as that to be protected as should be the test fluid. The two most widely used tests are LPR and Tafel plots. Both are ideally performed using a Gill 8 or Gill 12. The use of a multiple channel instrument allows for replication to gain confidence in the results. The Bubble Test software automatically groups the tests and prints inhibition reports using the LPR method. After all the small LPR perturbations have been made an optional Tafel sweep is performed to obtain the Tafel slopes. AC impedance is less commonly used except with high resistance electrolytes where the IR drop in the solution needs to be measured and overcome.