CONTROL OF STRESS CORROSION

Abstract

This study of the control of stress corrosion cracking susceptibility of steels by application of protective coatings was designed to use abrasive blasted specimens to simulate more nearly the surfaces and conditions of manufacturing operation. Bent beam speciments of 4130, 6150, and 18% nickel maraging steel were prepared at yield strength levels of 204, 231, and 316 ksi respectively for test at 75% of yield strength. Test atmospheres were outdoor, high humidity and salt spray (5%), and cycles of these alternating between salt spray, humidity and air. Cycle tests produced more rapid failure than single environments. Abrasive blasting extended the time of failure as compared to non-blasted uncoated specimens. Coated specimens were electroplated with zinc, zinc phosphatized, or brushed with zinc filled paint. Specimens of 4130 steel had not failed in over a year in outdoor exposure and 6 months in high humidity. Failures were noted with all the materials in cycle tests with indication of extended time to failure as a result of using zinc filled paint.

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Document Details

Document Type
Technical Report
Publication Date
Jan 18, 1965
Accession Number
AD0613652

Entities

People

  • R. H. Wolff

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Abrasive Blasting
  • Air Force
  • Air Force Facilities
  • Coatings
  • Dispersions
  • Environment
  • High Humidity
  • Maraging Steels
  • Materials
  • Materials Laboratories
  • Military Research
  • Munitions
  • Ordnance Laboratories
  • Protective Coatings
  • Stress Corrosion
  • Stress Corrosion Cracking
  • Yield Strength

Fields of Study

  • Materials science

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Surface Coatings Technology.
  • Surface Engineering/Surface Coating Technology.