Barium sulfate (BaSOJ deposition is a serious problem in many processing environments. Much of the work on BaSO4 scaling has concentrated on using beaker tests to analyze the formation of crystals in the bulk solution, and this technique has been used to assess scale control inhibitors. The present study reports results of a study comparing the characteristics of mineral scale formation (BaSOJ in a bulk solution and at a solid surface. An electrochemically based technique, in which the rate of oxygen-reduction reaction at a rotating disk electrode (RDE) surface is used to assess the extent of scale coverage, was used in conjunction with assessment of bulk precipitation measurements. Results from this study showed that the action of a commercial polyphosphinocarboxylic acid (PPCA) inhibitor was different in the bulk solution and at the surface. The addition of 25 ppm PPCA, although effective in retarding bulk precipitate formation, enhanced the level of surface scaling. Practical implications resulting from these findings are discussed. ©2000, NAGE International.
|Number of pages||8|
|Publication status||Published - 2000|
- Barium sulfate
- Rotating disk electrode