Reference

Thermodynamic properties of nickel dibromide and nickel monosulfate from 10 to 1,200 K

Thermodynamic properties of nickel dibromide and nickel monosulfate from 10 to 1,200 K. Stuve, J. M.; Ferrante, M. J.; Ko, H. C. (Albany Metall. Res. Cent., Bur. Mines, Albany, Oreg., USA). U. S., Bur. Mines, Rep. Invest., RI 8271, 15 pp. (English) 1978. CODEN: XBMIA6. ISSN: 0096-1922. DOCUMENT TYPE: Report CA Section: 69 (Thermodynamics, Thermochemistry, and Thermal Properties) Low temp. heat capacities were detd. of NiBr2 [7786-81-4] and NiSO4 [7786-81-4] by adiabatic calorimetry at 9-70 K. The std. entropies of NiBr2 and NiSO4 were calcd. as 29.26 ± 0.06 and 24.21 ± 0.04 cal/degree-mole, resp. The enthalpy of formation (DH°f, 298.15 K) of NiBr2 is -50.64 ± 0.31 kcal/mol. High temp. enthalpies of NiBr2 and NiSO4 were measured by drop calorimetry.

Corrosion protection layer for heat-resistant alloys

Corrosion protection layer for heat-resistant alloys. Faber, Guy; Maggi, Carlo M.; Trindler, Walter (BBC A.-G. Brown, Boveri und Cie., Switz.). Ger. Offen. DE 2649388 20 Apr 1978, 21 pp. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C25D015-00. PRIORITY: CH 76-13082 15 Oct 1976. DOCUMENT TYPE: Patent CA Section: 56 (Nonferrous Metals and Alloys) Corrosion resistant coatings are produced on Ni or Co superalloys, such as used for making gas turbine components. The coating consists of a metal matrix, such as Ni or Co, in which oxidn. resistant discrete particles, for example Cr3Si, TaC, or FeSi, are homogeneously distributed. This coating is electrolytically deposited on the superalloy surface in a 0.1-0.5 mm thickness; a subsequent 1-4 h heat-treatment at 1050-1250° allows formation of a diffusion-bonded corrosion resistant surface coating. Thus, a cast Inconel 738 [12773-70-5] gas-turbine vane blade was degreased in NaOH, then anodically etched in H2SO4. After rinsing, the blade was immersed in an electrolyte kept at 32-36° and contg. NiSO4 [7786-81-4] 300, NiCl2 [7718-54-9] 80 and B2O3 [1303-86-2] 8 g/L. In this electrolyte Cr3Si [12018-36-9] (3-8 m) 10 and FeSi [12022-95-6] (3-7 m) 15 g was kept in dispersion by pressurized air. Electrolysis for 4 h at 150-230 A/dm2 c.d. produced a 0.12-0.20 mm thick coating consisting of an Ni matrix contg. homogeneously distributed FeSi and Cr3Si particles. After coating, the blade was heated to 1120° for 3 h under vacuum, then cooled to room temp. in 1 h. The treatment produced a corrosion resistant coating. This coating exhibited protective characteristics even when exposed to elevated temp. for extended periods.