Understanding the effect of Li and flow velocity on corrosion deposition at 230 °C hydrogenated water. (15th May 2020)

• Record Type: Journal Article
• Authors: Cassineri, Stefano; Cioncolini, Andrea; Curioni, Michele; Morrison, Jonathan; Banks, Andrew; Stevens, Nicholas; Scenini, Fabio
• Is Part Of: Corrosion science. Volume 168(2020)
• Publication Date: 2020-05-15
• Subjects: Corrosion deposition -- PWR primary water -- Stainless steel -- Micro-orifice -- Micro-fluidic; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2020.108588
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: CRUD build-up increased following a power law with the fluid velocity. Electrokinetic deposition induced CRUD deposition occurred at alkaline pH (2–2.5 ppm of Li). Magnetite solubility and build-up rate decreased at alkaline pH. Particulate oxide build-up was negligible at high pH. Abstract: The effect of flow velocity, pH and lithium concentration on corrosion product deposition in accelerated flow regions was investigated in simulated nuclear reactor primary water using discs containing micro-orifices. The results also showed that a well adhered crystalline deposit formed between 2 and 2.5 ppm lithium, where the zeta potential of stainless-steel specimens is negative and the electrokinetic effects are expected to dominate. Conversely, a loosely adherent deposit driven by the deposition of particulates was formed for lower lithium concentrations.