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Title: PROCESS OF COATING WITH NICKEL BY THE DECOMPOSITION OF NICKEL CARBONYL

Abstract

An improved process is presented for the deposition of nickel coatings by the thermal decomposition of nickel carbonyl vapor. The improvement consists in incorporating a small amount of hydrogen sulfide gas in the nickel carbonyl plating gas. It is postulated that the hydrogen sulfide functions as a catalyst. i

Inventors:
Publication Date:
Research Org.:
Originating Research Org. not identified
OSTI Identifier:
4238987
Patent Number(s):
US 2881094
Assignee:
U.S. Atomic Energy Commission DTIE; NSA-13-015434
Resource Type:
Patent
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-59
Country of Publication:
United States
Language:
English
Subject:
METALLURGY AND CERAMICS; CARBONYLS; CATALYSIS; COATING; DECOMPOSITION; HYDROGEN SULFIDES; NICKEL; NICKEL COMPOUNDS; TRACE AMOUNTS; VAPORS

Citation Formats

Hoover, T.B. PROCESS OF COATING WITH NICKEL BY THE DECOMPOSITION OF NICKEL CARBONYL. United States: N. p., 1959. Web.
Hoover, T.B. PROCESS OF COATING WITH NICKEL BY THE DECOMPOSITION OF NICKEL CARBONYL. United States.
Hoover, T.B. 1959. "PROCESS OF COATING WITH NICKEL BY THE DECOMPOSITION OF NICKEL CARBONYL". United States. doi:.
@article{osti_4238987,
title = {PROCESS OF COATING WITH NICKEL BY THE DECOMPOSITION OF NICKEL CARBONYL},
author = {Hoover, T.B.},
abstractNote = {An improved process is presented for the deposition of nickel coatings by the thermal decomposition of nickel carbonyl vapor. The improvement consists in incorporating a small amount of hydrogen sulfide gas in the nickel carbonyl plating gas. It is postulated that the hydrogen sulfide functions as a catalyst. i},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1959,
month = 4
}
  • monoxide on being contacted with a heated sunface. A closed system is described wherein advantage is taken of this reaction to nickel-clad the heated surfaces of various objects by continuously circulating Ni(CO)/sub 4/ in a CO carrier. High-grade coatings of nickel can be obtatned at 275 to 285 tained C with 20 to 25 vol% Ni(CO)/sub 4/in the gas and at 270 to 310 tained C at 0.5 to 5 vol% Ni(CO)/sub 4/. The oxygen content in the gas phase should not exceed 0.4 vol%. Since the thermal decomposition of Ni(CO)/sub 4/ is accompanied by an adsorption of heat, themore » rate of circulation of gas over the heated surface should be limited to 0.006 to 0.02 m/sec to control the temperature drop. The gas flow is periodically reserved to improve the uniformity of the coating. The cladding is weakly bonded irrespective of the metallic base, the roughness of the cladding, or the conditions of deposition. A thermal treatment in hydrcgen for 30 minutes at 550 to 770 tained C results in a firm bond that is maintained even after repeated bending to an angle of 180 tained . If the temperature of deposition is not rigidly controlled, fine bubbles can be detected in the cladding. Tests show that coatings>l0 ation in thickness are compact, non-porous, and resistant to corrosion when thermally treated with hydrogen at 550 to 700 tained C. Special measures must be taken to protect personnel from the poisonous effects of NNi(CO)/sub 4/ and CO. This method of nickel cladding is recommended over the electrolytic method whenever complicated shapes are to be clad, a less porous coating is desired, or a high-grade coating is not possible or very difficult by electrolytic methods. (TTT)« less
  • A description of the deposition of nickel coatings on metal surfaces of complex shapes by heating the metal object in an atmosphere of nickel carbonyl is given. (auth)
  • Catalysts prepared by thermally decomposing Fe(CO)/sub 5/ on Al/sub 2/O/sub 3/ (alumina) powder or Ni/Al/sub 2/O/sub 3/ catalysts were studied using both methanation reaction kinetics measurements and in situ Moessbauer spectroscopy. Iron-induced shifts in the kinetic parameters of the methanation reaction over supported nickel catalysts are the consequence of both pore-mouth blocking of the alumina micropores by iron particles and the interaction of iron with nickel particles in the macropores of the support. The presence of nickel appears to facilitate the formation of zero-valent iron during the decompoition of Fe(CO)/sub 5/. In addition, Auger electron spectroscopy (AES) studies of modelmore » Ni/Al/sub 2/O/sub 3/ samples composed of nickel evaporated onto thin films of alumina demonstrated that, at low partial pressures, Fe(CO)/sub 5/ decomposes preferentially on nickel surfaces rather than on Al/sub 2/O/sub 3/. Besides pore-mouth blocking, iron-induced deactivation of nickel methanation catalysts can also be attributed to the deposition of carbon on the catalyst. 20 references, 4 figures, 2 tables.« less