INTERACTION OF MOLYBDATE ANIONS WITH THE PASSIVE FILM ON ALUMINUM

被引：68

作者：

MOSHIER, WC ^{[1
]}

DAVIS, GD ^{[1
]}

机构：

[1] MARTIN MARIETTA CORP LABS,DEPT SURFACE SCI,BALTIMORE,MD 21227

来源：

CORROSION | 1990年 / 46卷 / 01期

关键词：

D O I：

10.5006/1.3585065

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using x-ray photoelectron spectroscopy (XPS), the interaction of sodium molybdate with Al was studied under a number of different conditions, including variations in molybdate concentration, pH, and applied potential. By comparison with a database of Mo binding energies, the results show several different oxidation states in the film. Mechanisms were developed to describe how changes in passive film chemistry lead to improved resistance to pitting in chloride solutions. In contrast to earlier investigations, it was found that the formation of Mo+4 did not improve passivity. Improvements in pitting resistance were associated with a molybdate-rich region on the film surface that inhibited the ingress of Cl- anions to the metal/film interface.

引用

页码：43 / 50

页数：8