Passive and transpassive films formed on a nickel alloy in ammoniacal solution

被引：2
|
作者：
Asselin, E. [1 ]
Alfantazi, A. [1 ,2 ]
Rogak, S. [2 ]
机构：
[1] Univ British Columbia, Dept Mat Engn, Vancouver, BC V6T 1Z4, Canada
[2] Univ British Columbia, Dept Mech Engn, Vancouver, BC V6T 1Z4, Canada
来源：
SURFACE AND INTERFACE ANALYSIS | 2009年 / 41卷 / 06期
基金：
加拿大自然科学与工程研究理事会;
关键词：
passive film; Ni alloys; XPS; alloy; 625; AES; ammonia; RAY PHOTOELECTRON-SPECTROSCOPY; CHEMICAL-COMPOSITION; SUPERCRITICAL WATER; SULFATE-SOLUTIONS; HIGH-TEMPERATURE; CORROSION; XPS; CR; OXIDATION; CHROMIUM;
D O I：
10.1002/sia.3052
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The surface of alloy 625 (Ni-22Cr-9Mo) was characterized with XPS and AES depth profiling after exposure to mildly alkaline ammoniacal solution atopen circuit and after potentiostatic treatments at various potentials. It was determined that the passive surface film was a Cr and Mo oxide that was depleted in Ni with respect to the bulk alloy. Increased solution temperatures or oxygen concentrations decreased the Ni to Cr ratio in the passive film. The alloy's transpassive film was characterized using SEM and EDX as well as XPS. The transpassive film was heavily depleted in Ni and Cr and consisted mainly of an oxide of Fe. Copyright (C) 2009 John Wiley & Sons, Ltd.
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页码：489 / 495
页数：7
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