Accession Number : AD0767326

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

Descriptive Note : Technical summary rept. no. 4,

Corporate Author : NATIONAL BUREAU OF STANDARDS WASHINGTON D C INST FOR MATERIALS RESEARCH

Personal Author(s) : Kruger,J. ; Ambrose,J. R.

Report Date : JUL 1973

Pagination or Media Count : 75

Abstract : The early stages of crevice corrosion of AISI 304 stainless steel in 1.ON NaCl solution have been detected using the ellipsometer to measure changes in optical properties occurring within the crevice between a polished metal surface and a glass plate. Changes in the ellipsometer parameters begin almost immediately upon creation of the crevice and can be interpreted as resulting from a build-up of soluble species within the crevice solution, followed by an overall thinning of the protective film and general corrosion attack. Such optical changes could not be reproduced by deoxygenation of the bulk solution without the presence of a crevice nor were they observed during experiments using a Ti-8Al-1Mo-1V alloy, which is not susceptible to crevice corrosion in the 1.ON NaCl at room temperature. (Author)

Descriptors :   (*STRESS CORROSION, FILMS), (*STAINLESS STEEL, STRESS CORROSION), (*TITANIUM ALLOYS, STRESS CORROSION), PH FACTOR, CRACKS, CHLORIDES, NITRATES, REACTION KINETICS

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE