Study of the effect of polyacrylic acid dispersant on magnetite deposits in steam generators conditions

The present paper aims at determining and understanding the curative effect and action mode of polyacrylic acid (PAA) dispersant on magnetite (Fe3O4) deposits on Inconel tubes in the conditions found in steam generators (SGs). Magnetite deposits produced by electrodeposition on Inconel 600 TT and 690 TT have been used as model layers and exposed to various concentrations of PAA in a high pressure and temperature dedicated experimental loop. Measurements of iron concentration and post-test deposit characterizations have been performed. They show that the iron concentration increases linearly with the introduced quantity of PAA and clarify its effect on the chemical, morphological and structural properties of the layers.