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

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.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1966
Accession Number
AD0640176

Entities

People

  • R. H. Wolff

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Chemical Synthesis
  • Chemistry
  • Coatings
  • Engineering
  • Hydrogen
  • Hydrogen Embrittlement
  • Materials
  • Metals
  • Phosphate Coatings
  • Production Engineering
  • Sodium Compounds
  • Sodium Hydroxide
  • Static Loads
  • Steel
  • Surface Properties
  • Tensile Strength

Readers

  • Fault Tolerant Diagnosis of Black and White Balloon Isolation Tests Using ¥.
  • Materials Science (Mechanical Engineering).
  • Surface Engineering/Surface Coating Technology.