Accession Number:

AD0770856

Title:

Development of a Nuclear Microprobe Technique for Hydrogen Analysis in Selected Materials.

Descriptive Note:

Final rept. 18 Apr 72-18 Jul 73,

Corporate Author:

GRUMMAN AEROSPACE CORP BETHPAGE N Y RESEARCH DEPT

Personal Author(s):

Report Date:

1973-10-01

Pagination or Media Count:

106.0

Abstract:

The Lithium Nuclear Microprobe LNM has been developed to the point where it now is a unique and reliable nondestructive tool for the measurements of hydrogen concentration depth profiles in material surfaces. The hydrogen concentration calibration was performed using hydrogen-in-titanium NSB standards and Kapton, a polyimide film. Hydrogen surface concentrations were measured in cadmium and chromium plated D6AC steel samples, smooth and fractured Ti-6Al-4V surfaces that had been exposed to a stress corrosion environment, and smooth surfaces of 7075 aluminum alloys that had been exposed to conditions of stress corrosion. Hydrogen concentration depth profiles were measured in cadmium plated D6AC steel and 7075 aluminum alloy samples. Very high hydrogen concentrations found in these samples were linked to mechanical property degradation and corrosion. Thus the LNM has emerged as a proven, currently unmatched, diagnostic technique for accurate in situ measurements of localized hydrogen concentrations. Modified author abstract

Subject Categories:

  • Physical Chemistry
  • Properties of Metals and Alloys
  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE