Accession Number:

AD0640176

Title:

HYDROGEN EMBRITTLEMENT OF STEEL IN METAL FINISHING PROCESSES OF BLACK OXIDE AND ZINC PHOSPHATIZE

Descriptive Note:

Technical rept.

Corporate Author:

ARMY WEAPONS COMMAND ROCK ISLAND IL RESEARCH DEVELOPMENT AND ENGINEERING DIRECTORATE

Personal Author(s):

Report Date:

1966-06-01

Pagination or Media Count:

24.0

Abstract:

Static load tests were conducted with notched, steel tensile specimens after processing in black oxide specification MIL-C-13924 Class 1 and also after processing in zinc phosphatize solution specification MIL-P-16232C Type Z, to determine embrittlement characteristics of these processes. The scope of work was limited to a brief survey to determine whether the problem was serious for these processes. Results based on the use of types 4140, 1045 and 1095 steel specimens at hardness of Rockwell C 50 show that embrittlement is not a problem with the black oxide process. The zinc phosphatize process is critically embrittling, and relief treatment for higher strength steels is advisable.

Subject Categories:

  • Coatings, Colorants and Finishes
  • Metallurgy and Metallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE