Abstract
The oxidation of AISI 316L(NG) stainless steel in simulated pressurised
water reactor (PWR) coolant with or without addition of 1 ppm Zn at 280 °C for up to 96 h
has been characterised in situ by electrochemical impedance
spectroscopy (EIS), both at the corrosion potential and under anodic
polarisation up to 0.5 V vs. the reversible hydrogen electrode (RHE).
Additional tests were performed in simulated PWR coolant with the
addition of 0.01 M Na2B4O7 to exclude
the effect of pH excursions probably due to Zn hydrolysis reactions. The
thickness and in-depth composition of the oxide films formed at open
circuit and at 0.5 V vs. RHE in the investigated electrolytes have been
estimated from X-ray photoelectron spectroscopy (XPS) depth profiles.
The kinetic and transport parameters characterising the oxide layer
growth have been estimated using a calculational procedure based on the
mixed conduction model for oxide films. Successful simulations of both
the EIS and XPS data have been obtained. The parameter estimates are
discussed in terms of the effect of Zn on the oxide layers on stainless
steel in PWR conditions.
Original language | English |
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Pages (from-to) | 1056-1069 |
Number of pages | 14 |
Journal | Electrochimica Acta |
Volume | 54 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2009 |
MoE publication type | A1 Journal article-refereed |
Keywords
- stainless steel
- pressurised water reactor coolant
- oxide film growth
- zinc incorporation
- kinetic model