Sulfur segregation on a hydrogen-stimulated nickel surface
Abstract
A technique based on combining segregation experiments with a hydrogen permeation technique has been suggested to investigate hydrogen-stimulated segregation of impurities on a metal surface. Using this technique, the influence of hydrogen upon sulfur segregation on a nickel surface was investigated. Sulfur diffusivities in nickel were determined in the temperature range 923-1123 K both with and without hydrogen in the bulk of the nickel sample. Hydrogen was observed to intensify the process of sulfur segregation on the nickel surface. The influence of hydrogen on sulfur diffusivity in nickel was considered in the framework of a model of a solid substitution solution with hydrogen as an interstitial impurity, taking into account different atom configurations in approximation of the nearest neighbors. An equation describing qualitatively the hydrogen bulk concentration dependence of sulfur diffusivity in nickel has been derived.
- Publication:
-
Physical Review B
- Pub Date:
- February 2000
- DOI:
- 10.1103/PhysRevB.61.4934
- Bibcode:
- 2000PhRvB..61.4934R
- Keywords:
-
- 68.35.Fx;
- 81.30.Mh;
- 66.30.Jt;
- 64.75.+g;
- Diffusion;
- interface formation;
- Solid-phase precipitation;
- Diffusion of impurities;
- Solubility segregation and mixing;
- phase separation