Barium sulfate (BaSO4) 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 (BaSO4) 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 commercial polyphosphincarboxylic 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 discusses.
Barium sulfate deposition and precipitation using a combined electrochemical surface and bulk solution approach
Abscheidung und Ausfällung von Bariumsulfat durch ein kombiniertes Verfahren mit einer elektrochemischen Oberfläche und der Volumenlösung
Corrosion, Houston ; 56 , 6 ; 638-645
2000
8 Seiten, 13 Bilder, 2 Tabellen, 21 Quellen
Aufsatz (Zeitschrift)
Englisch
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