High-throughput characterization of the effects of H2O vapour on early oxidation across AlxFeyNi1 − x − y composition space. (May 2016)

• Record Type: Journal Article
• Authors: Payne, Matthew A.; Miller, James B.; Gellman, Andrew J.
• Is Part Of: Corrosion science. Volume 106(2016)
• Page Start: 61
• Page End: 81
• Publication Date: 2016-05
• Subjects: A. aluminium -- A. iron -- A. nickel -- B. Raman spectroscopy -- B. XPS -- C. oxidation; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2016.01.026
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Al x Fe y Ni1 − x − y ( x = 0 → 1, y = 0 → 1 − x ) oxidation in H2 O/air at 427 °C was studied. The continuous composition boundary of internal/external oxidation was identified. Data were compared with Al x Fe y Ni1− x - y oxidation in dry air at 427 °C. The differences are assessed in terms of a modified Wagner–Maak criterion. Abstract: The presence of H2 O vapour in an oxidizing environment can increase the critical aluminium concentration, N Al *, required to establish a passivating Al2 O3 scale in multicomponent alumina-forming alloys. This work used Al x Fe y Ni1 − x − y composition spread alloy film combinatorial libraries to determine N Al * ( x, y ) continuously across Al x Fe y Ni1 − x − y composition space ( x = 0 → 1, y = 0 → [1 − x]) in a 10% H2 O/air mixture at 427 °C. The N Al * ( x, y ) in this environment was significantly higher across much of composition space than that previously measured in dry air. Physical insights from the observed differences are considered using a modified Wagner–Maak model.