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Application of a new concept to detergency
Author(s) -
Georges J. M.,
Loubet J. L.,
Alberola N.,
Meille G.,
Bourgog H.,
Hoornaert P.,
Chapelet G.
Publication year - 1991
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.3010030202
Subject(s) - brittleness , materials science , adhesive , adsorption , composite material , substrate (aquarium) , base oil , adhesive wear , chemical engineering , tribology , layer (electronics) , chemistry , organic chemistry , engineering , geology , scanning electron microscope , oceanography
The purpose of this paper is to describe a new concept in the detergency phenomenon for engines. It is well known that oil detergency is associated with additive adsorption, neutralisation of the acid formed, and insoluble encapsulation. However, the literature is poor in relation to the mechanical properties of oxidised oil film created during the coking process. Basic experiments taking a pure base oil and an overbased additivated oil show clearly two different types of mechanical behaviour in the burned oil film. The base oil creates a ductile film very adherent to the substrate. Conversely, the additivated film can be very brittle and shows clearly cohesive cracks followed by adhesive film‐substrate cracks. A physico‐mechanical model is proposed to explain the role played by the internal stress developed in the film during its gel state. This analysis leads to a simple thermooxidation laboratory test, where mechanical behaviour is evaluated by peeling and is correlated with engine detergency.