Corrosion behavior of ceramic-coated ZIRLO™ exposed to supercritical water

Mandapaka, Kiran K, Cahyadi, Rico S, Yalisove, Steven, Kuang, Wenjun, Sickafus, K, Patel, Maulik K ORCID: 0000-0002-3214-5752 and Was, Gary S (2018) Corrosion behavior of ceramic-coated ZIRLO™ exposed to supercritical water. JOURNAL OF NUCLEAR MATERIALS, 498. pp. 495-504.

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Abstract

The corrosion behavior of ceramic coated ZIRLO™ tubing was evaluated in a supercritical water (SCW) environment to determine its behavior in high temperature water. Two coating architectures were analyzed; a 4 bi-layer TiAlN/TiN coating with Ti bond coat, and a TiN monolithic coating with Ti bond layer on ZIRLO™ tubes using cathodic arc physical vapor deposition (CA-PVD) technique. Femtosecond laser ablation was used to introduce reproducible defects in some of the coated tubes. On exposure to deaerated supercritical water at 542 °C for 48 h, coated tubes exhibited significantly higher weight gain compared to uncoated ZIRLO™. Examination revealed formation of a uniform ZrO2 layer beneath the coating of a thickness similar to that on the uncoated tube inner surface. The defects generated during the coating process acted as preferential paths for diffusion of oxygen resulting in the oxidation of substrate ZIRLO™. However, there was no delamination of the coating. There were insignificant differences in the oxidation weight gain between laser ablated and non-ablated tubes and the laser induced defects did not spread beyond their original size.

Item Type:	Article
Uncontrolled Keywords:	ZIRLO (TM), Multilayer coating, Supercritical water, Corrosion, Coating defects
Depositing User:	Symplectic Admin
Date Deposited:	07 Mar 2018 08:48
Last Modified:	26 Mar 2024 15:30
DOI:	10.1016/j.jnucmat.2017.10.040
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3018720