Accession Number:

ADA003900

Title:

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

Descriptive Note:

Technical summary rept. no. 5, 1 Mar-31 Dec 73,

Corporate Author:

NATIONAL BUREAU OF STANDARDS WASHINGTON D C INST FOR MATERIALS RESEARCH

Personal Author(s):

Report Date:

1974-09-01

Pagination or Media Count:

89.0

Abstract:

A study of the effect of alloying chromium and molybdenum in ferritic stainless steels has been made using techniques to study repassivation kinetics tribo-ellipsometry and depassivation kinetics a recently developed ellipsometry technique for studying optical changes occurring within a crevice. Constant strain rate studies were performed using AISI 304 stainless steel exposed to acidified 1.ON NaCl solution pH3.0. In this particular environment, repassivation kinetics measurements using the tribo-ellipsometric technique had shown that the metal dissolution rates were rather large due to reduced film repair kinetics, indicating the possibility of susceptibility to stress corrosion cracking SCC. Reduced time to failure and maximum sustained load at a one strain rate suggest a relationship between SCC, repassivation kinetics, and rate of pure metal production. A review of current approaches to the study of stress corrosion and a discussion of how these approaches can lead to new failure prediction tools is given.

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE