Accession Number:

ADA019648

Title:

The Role of Passive Film Growth Kinetics and Properties in Stress Corrosion and Crevice Corrosion Susceptibility

Descriptive Note:

Technical summary rept. no. 6, Sep 1974-Oct 1975

Corporate Author:

NATIONAL BUREAU OF STANDARDS WASHINGTON DC INST FOR MATERIALS RESEARCH

Personal Author(s):

Report Date:

1975-10-01

Pagination or Media Count:

87.0

Abstract:

This report consists of four parts as follows Part I - A study of the influence of molybdate ions on the repassivation kinetics of iron in chloride solutions. Results indicate that molybdate ions precipitated as ferrous molybdate in pits inhibit propagation but not initiation. Part II - Using a technique that allows ellipsometric studies to be made in a crevice, this work has found significantly lower film growth rates in a crevice on iron as compared to the rates observed outside the crevice. Part III - A review of the current state of our understanding of chemical breakdown of passivity is given with a listing of critical questions that remain to be resolved. A short bibliography on the subject is included. Part IV - A review of the qualitative applications of ellipsometry to study localized corrosion that have been developed at NBS is given.

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE