PROCESS - PLATING - CRACK - FREE CHROMIUM, CF-500, PHYSICAL AND CHEMICAL PROPERTIES, EVALUATION OF
Abstract
Crack-free 500 Cr and conventional Cr plated 4130 and Thermold A steel (H-11 type steel similar to Vascojet 1000) test specimens were plated and compared in various tests. The tests were: crack detection, visual observations, adhesion, hardness, salt spray accelerated corrosion tests, sustained load tests, and effects of various bake-out conditions on H content in plated Thermold A steel. The two types of Cr were comparable in appearance and adhesion but CF-500 Cr was slightly harder and considerably more corrosion resistant in salt spray tests. It was also determined that increasing the H relief bake-out conditions produced adequate sustained load strength of CF-500 Cr plated high heat treat steel. H analysis test results on specimens with one or more unplated edges showed the H content was reduced by increasing the bake- out time and temperature. Adequate H embrittlement relief was obtained by baking at 500 F for 23 hr.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 16, 1962
- Accession Number
- AD0272106
Entities
People
- E. W. Turns
Organizations
- General Dynamics