Accession Number : AD0824880

Title :   FURTHER DEVELOPMENT OF COATINGS FOR PROTECTION OF DISPERSION STRENGTHENED NICKEL FROM OXIDATION, PARTS I AND II,

Corporate Author : DU PONT DE NEMOURS (E I) AND CO WILMINGTON DE PIGMENTS DEPT

Personal Author(s) : Baker, F. R. ; Lambert, J. B. ; Monson, L. A. ; Alexander, G. B. ; Gadd, J. D.

Report Date : AUG 1967

Pagination or Media Count : 268

Abstract : Studies were made to develop and evaluate Cr/Al duplex coatings for protection of dispersion-strengthened TD-Nickel and related alloys. Improved coating processes, both for vacuum and atmospheric pressure operation were developed. Modifications of the pack inert to control the rate of chromizing were found helpful in reducing coating defects. Protective capabilities for Cr/Al ocatings in cyclic-oxidation of greater than 500 hours at 2200F and 200 hours at 2400F were achieved. In sulfidation-erosion rig tests at 2100F, coatings were protective for about 150 hours. For temperatures of 2200F or below, neither thermal shock nor mechanical behavior were adversely affected by coating. Duplex coatings applied to TD Cobalt and TC-Nickel-Molybdenum alloys also gave satisfactory protection. (Author)

Descriptors :   *CORROSION INHIBITION), (*COATINGS, (*NICKEL, CORROSION INHIBITION), DISPERSION HARDENING, NICKEL ALLOYS, METAL COATINGS, ALUMINUM COATINGS, CHROMIUM, MOLYBDENUM ALLOYS, COBALT ALLOYS, THORIUM COMPOUNDS, DIOXIDES, OXIDATION.

Subject Categories : Coatings, Colorants and Finishes
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE