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Mechanisms of oiliness additives

Mechanisms of oiliness additives
Mechanisms of oiliness additives
Ultrathin film interferometry has been used to measure the boundary film-forming behaviour of long chain, carboxylic acid oiliness additives. It has been shown that in dry conditions, these acids form very thin films of around 2–3 nm thickness. However when water is present, some acids form significantly thicker films, around 10 nm in thickness. The behaviour of these films is very similar to that previously seen with metal carboxylate additive films, including thick film collapse at high rolling speeds followed by film reformation at slow speeds. It is suggested thick films formed by long chain carboxylic acid additives result from reaction of the acids at the rolling solid surfaces in the presence of water to form deposits of insoluble iron carboxylate.
boundary lubrication, friction modifier additives, adsorption, carboxylic acids, fatty acid soaps, thin film, optical interferometry
0301-679X
241-247
Ratoi, M.
cfeffe10-31ca-4630-8399-232c4bc2beff
Anghel, V.
85b731b8-554a-4325-9856-f641508680ef
Bovington, C.
74d94506-5396-4898-852d-d38924bdaa1e
Spikes, H.A.
e8d32127-b018-44b9-ad78-49e446ed590e
Ratoi, M.
cfeffe10-31ca-4630-8399-232c4bc2beff
Anghel, V.
85b731b8-554a-4325-9856-f641508680ef
Bovington, C.
74d94506-5396-4898-852d-d38924bdaa1e
Spikes, H.A.
e8d32127-b018-44b9-ad78-49e446ed590e

Ratoi, M., Anghel, V., Bovington, C. and Spikes, H.A. (2000) Mechanisms of oiliness additives. Tribology International, 33 (3-4), 241-247. (doi:10.1016/S0301-679X(00)00037-2).

Record type: Article

Abstract

Ultrathin film interferometry has been used to measure the boundary film-forming behaviour of long chain, carboxylic acid oiliness additives. It has been shown that in dry conditions, these acids form very thin films of around 2–3 nm thickness. However when water is present, some acids form significantly thicker films, around 10 nm in thickness. The behaviour of these films is very similar to that previously seen with metal carboxylate additive films, including thick film collapse at high rolling speeds followed by film reformation at slow speeds. It is suggested thick films formed by long chain carboxylic acid additives result from reaction of the acids at the rolling solid surfaces in the presence of water to form deposits of insoluble iron carboxylate.

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Published date: April 2000
Keywords: boundary lubrication, friction modifier additives, adsorption, carboxylic acids, fatty acid soaps, thin film, optical interferometry
Organisations: Engineering Mats & Surface Engineerg Gp, Fluid Structure Interactions Group

Identifiers

Local EPrints ID: 66901
URI: http://eprints.soton.ac.uk/id/eprint/66901
ISSN: 0301-679X
PURE UUID: b9e1b0aa-e54b-4192-a693-111ac7bebe12

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Date deposited: 28 Jul 2009
Last modified: 16 Dec 2019 20:56

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Contributors

Author: M. Ratoi
Author: V. Anghel
Author: C. Bovington
Author: H.A. Spikes

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