THE ADSORPTION OF DINONYLNAPHTHALENESULFONATES ON METAL OXIDE POWDERS

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Abstract:

The adsorption of oleophilic rust inhibitors, sodium and barium dinonylnaphthalenesulfonate, from cyclohexane solution on NickelIII oxide and ironIII oxide was investigated. Rate data for adsorption of sodium dinonylnaphthalenesulfonate on nickel oxide indicate a complex mechanism of adsorption. An empirical equation was found that accurately describes the data. The log of the uncovered surface plotted against log time was linear. The extrapolated time for 50 coverage was 0.36 min. Experimentally the adsorption process was irreversible. The effect of temperature in the range of 10 to 60C on the adsorption isotherm was negligible. Adsorption isotherm data for sodium dinonylnaphthalenesulfonate were of a Langmuir type. The values of a indicated a more close-packed monolayer on nickel oxide than on iron oxide. The ratio of the molecules per square centimeter for the former and the latter was 1.49. The b values indicated a rather strong interaction at the metal oxide surfaces. Monolayer concentrations were found to be essentially the same irrespective of the salt used.

Author(s):
Kennedy, Paul ; Petronio, Marco ; Gisser, Henry
Author Organization(s):
FRANKFORD ARSENAL PHILADELPHIA PA
Supplementary Note:
Presented at the National Meeting of the American Chemical Society (157th), Minneapolis, Minn., Apr 1969. Availability: Pub. in Jnl. of Physical Chemistry, v74 n1 p102-107, 8 Jan 1970.
Pagination:
0010

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
FA-A70-1
Task Number(s):
1G062105A10902
Project Number(s):
DA-1-G-062105-A-109
 Subject Terms
Joint Capability Areas:
JCA_8.2.4_Leverage Capacities and Capabilities of Security Establishments; JCA_8.2_Shape; JCA_8_Building Partnerships; JCA_5.3_Planning; JCA_5_Command and Control
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*CORROSION INHIBITION, *LUBRICANT ADDITIVES, *SULFONATES, *OXIDES, *ADSORPTION, NICKEL COMPOUNDS, NAPHTHALENES, SODIUM COMPOUNDS, IRON OXIDES, POWDER METALS, BARIUM COMPOUNDS, SURFACE PROPERTIES, REPRINTS, SALTS
Field(s)/Group(s):
Physical Chemistry, Properties of Metals and Alloys, Lubricants and Hydraulic Fluids
Keyword(s):
*SURFACE CHEMISTRY, *CORROSION INHIBITION, NICKEL(III) OXIDE
Report Date:
1969 Jun 09