Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M137/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus
  • C10M137/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having no phosphorus-to-carbon bond
  • C10M137/04—Phosphate esters
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M137/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus
  • C10M137/12—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having a phosphorus-to-carbon bond
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
  • C10M169/04—Mixtures of base-materials and additives
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
  • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
  • C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
  • C10M2207/26—Overbased carboxylic acid salts
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2215/086—Imides
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
  • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
  • C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
  • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
  • C10M2219/046—Overbasedsulfonic acid salts
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
  • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
  • C10M2223/04—Phosphate esters
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
  • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
  • C10M2223/049—Phosphite
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
  • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
  • C10M2223/06—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having phosphorus-to-carbon bonds
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/04—Detergent property or dispersant property
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
  • C10N2030/12—Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2040/00—Specified use or application for which the lubricating composition is intended
  • C10N2040/25—Internal-combustion engines
  • C10N2040/252—Diesel engines
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2040/00—Specified use or application for which the lubricating composition is intended
  • C10N2040/25—Internal-combustion engines
  • C10N2040/255—Gasoline engines
  • C10N2040/26—Two-strokes or two-cycle engines

Definitions

• TITLE Lubricating composition to prevent corrosion and / or tribocorrosion of metal parts in an engine
• the present invention relates to novel lubricating compositions, in particular for engines, in particular useful for preventing corrosion and / or tribocorrosion of metal parts in an engine, and in particular in a two-stroke engine, such as a two-stroke marine engine.
• the present invention also relates to a method of passivation of metal parts of an engine, in particular of a two-stroke engine, such as a two-stroke marine engine.
• SO 3 sulfur oxides
• H 2 SO 4 sulfuric acid
• Other acids such as nitric acid, compounds bearing one or more carboxylic acid functions, or combinations of these acids, can also be responsible for the corrosion and / or tribocorrosion of engine parts.
• Acid corrosion occurs in the tribological system in the segment-piston-liner area. In this area on a lubricated engine the friction observed is of the reciprocating slip type.
• cylinder oils which provide lubrication of the piston-cylinder assembly
• system oils which provide lubrication for all moving parts other than those of the piston-cylinder assembly.
• the lubricating compositions for engines, and in particular for marine engines, currently used comprise a base oil to which dispersants and overbased detergents are added.
• These overbased detergents generally comprise a core of CaCC> 3 calcium carbonate coated with a layer of surfactant. Calcium carbonate reacts with sulfuric acid to form, in particular, calcium sulphate (CaSC> 4). The decrease in sulfuric acid in the medium allows parts to be protected against corrosion and / or tribocorrosion.
• the lubricating compositions used must be sufficiently basic (in particular to neutralize the acid), which implies increasing the amount of detergents included in these compositions.
• BN Basicity Indexes
• the increase in the amount of detergents in these lubricating compositions leads to an increase in the number of particles of CaCC> 3 and CaSC responsible for the wear of the surfaces by polishing (or abrasive wear) of the metal parts of the engine, and in particular of the parts.
• two-stroke engine cylinders such as two-stroke marine engines.
• the use of the lubricating compositions currently available does not completely protect the metal parts of the engine from corrosion and / or tribocorrosion, and in particular the metal parts of the two-stroke engine against tribocorrosion, when the friction is of reciprocating slip type.
• An objective of the present invention is to provide lubricating compositions making it possible to improve the protection of the metal parts of an engine, typically of a two-stroke engine, in particular of a two-stroke marine engine, against corrosion and / or tribocorrosion.
• the present invention relates more particularly to the supply of cylinder oils for two-stroke engines, in particular for two-stroke marine engines.
• Another objective of the present invention is to provide lubricating compositions exhibiting a reduced Basicity Index.
• s is 0 or 1;
• radicals X represent, independently of each other, groups -OR ’or R’, where R ’represents hydrogen or a linear or branched hydrocarbon group, preferably having 1 to 36 carbon atoms, provided that:
• R ' represents an alkyl group, linear or branched, comprising from 1 to 36 carbon atoms, preferentially from 2 to 30 carbon atoms, advantageously from 4 to 24 carbon atoms, or R' represents an alkenyl group, linear or branched, comprising from 2 to 36 carbon atoms, preferably from 2 to 30 carbon atoms, advantageously from 4 to 24 carbon atoms.
• a lubricating composition comprising:
• R 1 and R 2 identical or different, independently represent an alkyl group, linear or branched, comprising from 1 to 36 carbon atoms, preferably from 2 to 30 carbon atoms, advantageously from 4 to 24 carbon atoms, or R 1 and R 2 , identical or different, independently represent an alkenyl group, linear or branched, comprising from 2 to 36 carbon atoms, preferably from 2 to 30 carbon atoms, advantageously from 4 to 24 carbon atoms; and
• R 3 represents hydrogen or a hydroxyl group (OH).
• the alkenyl group (R 1 and / or R 2 ) according to the invention comprises at least one double bond.
• said double bond is located at C-9, C-10 of the alkenyl group relative to the phosphorus ester function.
• the R 1 , R 2 or R 3 group does not contain a sulfur or nitrogen atom.
• a hydrocarbon group is a chain, linear or branched, saturated, partially or totally unsaturated, comprising from 1 to 36 carbon atoms, preferably from 2 to 30 carbon atoms, advantageously from 4 to 24 carbon atoms.
• the base oil included in the lubricating composition is chosen from oils of mineral, synthetic or vegetable origin as well as their mixtures.
• the mineral or synthetic oils generally used in the application belong to one of the classes defined in the API classification as summarized in the table below.
• Group 1 mineral oils can be obtained by distillation of selected naphthenic or paraffinic crudes, followed by purification of these distillates by processes such as solvent extraction, solvent or catalytic dewaxing, hydrotreatment or hydrogenation.
• Group 2 and 3 oils are obtained by more stringent purification processes, for example a combination of hydrotreatment, hydrocracking, hydrogenation and catalytic dewaxing.
• Group 4 and 5 synthetic bases include poly-alphas olefins, polybutenes, polyisobutenes, alkylbenzenes.
• base oils can be used alone or as a mixture.
• Mineral oil can be combined with synthetic oil.
• Cylinder oils for 2-stroke marine diesel engines have a viscosimetric grade SAE-40 to SAE-60, generally SAE-50 equivalent to a kinematic viscosity at 100 ° C between 16.3 and 21.9 mm 2 / s.
• Grade 40 oils have a kinematic viscosity at 100 ° C of between 12.5 and 16.3 mm 2 / s.
• Grade 50 oils have a kinematic viscosity at 100 ° C of between 16.3 and 21.9 mm 2 / s.
• Grade 60 oils have a kinematic viscosity at 100 ° C of between 21.9 and 26.1 mm 2 / s.
• cylinder oils for two-stroke marine diesel engines having a kinematic viscosity at 100 ° C. of between 18 and 21.5, preferably between 19 and 21.5 mm 2 / s.
• This viscosity can be obtained by mixing additives and base oils, for example containing Group 1 mineral bases such as Neutral Solvent bases (for example 500 NS or 600 NS) and Brightstock. Any other combination of mineral, synthetic or vegetable bases having, mixed with the additives, a viscosity compatible with the SAE-50 grade can be used.
• Group 1 mineral bases such as Neutral Solvent bases (for example 500 NS or 600 NS) and Brightstock. Any other combination of mineral, synthetic or vegetable bases having, mixed with the additives, a viscosity compatible with the SAE-50 grade can be used.
• a conventional formulation of cylinder lubricant for slow 2-stroke marine diesel engines is of grade SAE-40 to SAE-60, preferably SAE-50 (according to the SAE J300 classification) and comprises at least 50% by mass of oil of lubricating base of mineral and / or synthetic origin, suitable for use in marine engines, for example, API Group 1 class, i.e. obtained by distillation of selected crudes followed by the purification of these distillates by processes such as solvent extraction, solvent or catalytic dewaxing, hydrotreatment or hydrogenation.
• Their Viscosity Index (VI) is between 80 and 120; their sulfur content is greater than 0.03% and their saturated content is less than 90%.
• the lubricating composition according to the invention comprises at least 50% by mass of base oil (s) relative to the total mass of the composition.
• the lubricating composition according to the invention comprises at least 60% by mass, or even at least 70% by mass, of base oil (s) relative to the total mass of the composition.
• the lubricating composition according to the invention comprises from 60% to 99.9% by mass of base oils, preferably from 70% to 98% by mass of base oils, relative to the total mass of the composition.
• the lubricating composition according to the invention further comprises at least one additive chosen from detergents, dispersants and their mixtures.
• the detergents used in the lubricating compositions according to the present invention are well known to those skilled in the art.
• the detergents commonly used in the formulation of lubricating compositions are anionic compounds comprising a long lipophilic hydrocarbon chain and a hydrophilic head.
• the associated cation is a metallic cation of an alkali or alkaline earth metal.
• the detergents are preferably chosen from alkali metal or alkaline-earth metal salts of carboxylic acids, sulphonates, salicylates, naphthenates, as well as salts of phenates.
• the alkali metals and alkaline earth metals are preferably calcium, magnesium, sodium or barium.
• metal salts can contain the metal in an approximately stoichiometric amount.
• neutral detergents typically have a BN, measured according to ASTM D2896, less than 150 mg KOH / g, or less than 100, or even less than 80 mg KOH / g.
• neutral detergents can partly contribute to the BN of the lubricants according to the present invention.
• BN is high, for example greater than 150 mg KOH / g, typically between 200 and 700 mg KOH / g, generally between 250 and 450 mg KOH / g.
• the excess metal providing the overbased character to the detergent is in the form of metal salts insoluble in oil, for example carbonate, hydroxide, oxalate, acetate, glutamate, preferably carbonate.
• the metals of these insoluble salts may be the same as those of the oil-soluble detergents or else they may be different. They are preferably chosen from calcium, magnesium, sodium or barium.
• the overbased detergents are thus in the form of micelles composed of insoluble metal salts held in suspension in the lubricating composition by the detergents in the form of oil-soluble metal salts.
• Overbased detergents comprising a single type of detergent soluble metal salt will generally be named after the nature of the hydrophobic chain of the latter detergent.
• overbased detergents will be said to be of mixed type if the micelles comprise several types of detergents, which differ from one another by the nature of their hydrophobic chain.
• the oil-soluble metal salts will preferably be carboxylates, phenates, sulphonates, salicylates, and mixed phenate-sulphonate and / or salicylate detergents of calcium, magnesium, sodium. or barium.
• the insoluble metal salts providing the overbased character are carbonates of alkali metals and alkaline earth metals, preferably calcium carbonate.
• the detergents used in the lubricating compositions according to the present invention are detergents overbased on calcium carbonate chosen from carboxylates, phenates, sulphonates, salicylates and mixed phenates - sulphonates - salicylates detergents.
• the lubricating composition according to the invention can comprise from 3% to 40%, preferably from 5% to 30%, advantageously from 10% to 25% by mass of detergent (s) relative to the total mass of the lubricating composition.
• Dispersants are well known additives used in the formulation of lubricating compositions, in particular for application in the marine field. Their primary role is to maintain in suspension the particles initially present or appearing in the lubricating composition during its use in the engine. They prevent their agglomeration by playing on steric hindrance. They can also exhibit a synergistic effect on neutralization.
• the dispersants used as lubricant additives contain a polar group, associated with a relatively long hydrocarbon chain, generally containing from 50 to 400 carbon atoms. The polar group typically contains at least one nitrogen or oxygen element.
• the compounds derived from succinic acid are dispersants that are particularly used as lubricating additives.
• succinimides obtained by condensation of succinic anhydrides and amines
• succinic esters obtained by condensation of succinic anhydrides and alcohols or polyols are used.
• These compounds can then be treated with various compounds, including sulfur, oxygen, formaldehyde, carboxylic acids and compounds containing boron or zinc to produce, for example, borated succinimides or zinc blocked succinimides.
• Mannich bases obtained by polycondensation of phenols substituted with alkyl groups, formaldehyde and primary or secondary amines, are also compounds used as dispersants in lubricants.
• the dispersants according to the invention are chosen from succinimides, such as polyisobutylene bis-succinimides, optionally borated or blocked with zinc.
• the lubricating composition according to the invention can comprise from 0.01% to 10%, preferably from 0.1% to 5%, advantageously from 0.5% to 3% by weight of dispersant (s) relative to to the total mass of the lubricating composition.
• the lubricating composition can also comprise at least one antiwear additive.
• the antiwear additive is zinc di-thiophosphate or DTPZn.
• DTPZn zinc di-thiophosphate
• these categories are also found various phosphorus, sulfur, nitrogen, chlorine and boron compounds.
• antiwear additives there is a wide variety of antiwear additives, but the most widely used category is that of phospho-sulfur additives such as metal alkylthiophosphates, in particular zinc alkylthiophosphates, and more specifically zinc dialkyldithiophosphates or DTPZn.
• phospho-sulfur additives such as metal alkylthiophosphates, in particular zinc alkylthiophosphates, and more specifically zinc dialkyldithiophosphates or DTPZn.
• Amine phosphates and polysulphides are also commonly used anti-wear additives.
• antiwear and extreme pressure additives of nitrogenous and sulfur type are also usually encountered, such as for example metal dithiocarbamates, in particular molybdenum dithiocarbamate.
• Glycerol esters are also antiwear additives. Mention may be made, for example, of mono, di- and trioleates, monopalmitates and monomyristates.
• the lubricating composition comprises, relative to the total weight of the lubricating composition:
• dispersant (s) optionally from 0.01% to 10% by weight, preferably from 0.1 to 5% by weight, more preferably from 0.5% to 3% by weight, of dispersant (s).
• the lubricating composition comprises, relative to the total weight of the lubricating composition:
• dispersant (s) optionally from 0.01% to 10% by weight, preferably from 0.1 to 5% by weight, more preferably from 0.5% to 3% by weight, of dispersant (s).
• the lubricating composition comprises, relative to the total weight of the lubricating composition:
• detergent optionally from 3 to 40% by weight, preferably from 5 to 30% by weight, more preferably from 10 to 25% by weight, of detergent (s).
• the lubricating composition comprises, relative to the total weight of the lubricating composition:
• detergent optionally from 3 to 40% by weight, preferably from 5 to 30% by weight, more preferably from 10 to 25% by weight, of detergent (s).
• the lubricating composition can also comprise all types of functional additives suitable for their use, for example anti-foam additives which can be, for example, polar polymers such as polymethylsiloxanes, polyacrylates, anti-oxidant additives, for example of the phenolic or amine type. and / or anti-rust additives, for example organometallic compounds or thiadiazoles. These are known to those skilled in the art.
• anti-foam additives can be, for example, polar polymers such as polymethylsiloxanes, polyacrylates, anti-oxidant additives, for example of the phenolic or amine type.
• anti-rust additives for example organometallic compounds or thiadiazoles.
• the compound of formula (A) is the following compound (I):
• the compound of formula (B) is the following compound (I):
• the compound of formula (A) is the following compound (II):
• the compound of formula (B) is the following compound (II):
• the lubricating composition comprises, relative to the total weight of the lubricating composition: - from 50 to 96.9% by weight, preferably from 60 to 95% by weight, more preferably from 70 to 90% by weight, of base oil (s),
• detergent (s) comprising at least one overbased detergent of phenate or sulphonate type
• dispersant (s) optionally from 0.01 to 10% by weight, preferably from 0.1 to 5% by weight, more preferably from 0.5 to 3% by weight, of dispersant (s).
• the lubricating composition comprises, relative to the total weight of the lubricating composition:
• dispersant (s) chosen from succinimides, and
• detergent optionally from 3 to 40% by weight, preferably from 5 to 30% by weight, more preferably from 10 to 25% by weight, of detergent (s).
• the present invention also relates to the use of the lubricating composition according to the invention for the lubrication of at least one metal part of an engine, such as a two-stroke engine and in particular a two-stroke marine engine.
• the use of the lubricating composition according to the invention makes it possible to prevent and / or reduce corrosion and / or tribocorrosion of said metal part of said engine.
• the present invention also relates to a method of lubricating at least one metal part of an engine, such as a two-stroke engine and in particular a two-stroke marine engine, comprising bringing said part of an engine into contact with the lubricating composition according to the invention.
• the present invention also relates to the use of a compound of formula
• (A) according to the invention in a lubricating composition comprising at least one base oil for preventing and / or reducing corrosion and / or tribocorrosion of at least one metal part of an engine, such as a two-engine engine. time and in particular a two-stroke marine engine.
• the present invention also relates to the use of a compound of formula
• (B) according to the invention in a lubricating composition comprising at least one base oil for preventing and / or reducing corrosion and / or tribocorrosion of at least one metal part of an engine, such as a two-engine engine. time and in particular a two-stroke marine engine.
• the present invention also relates to a method of preventing and / or reducing corrosion and / or tribocorrosion of at least one metal part of an engine, such as a two-stroke engine and in particular a two-stroke marine engine. time, comprising lubricating said metal part with a lubricating composition according to the invention.
• the present invention also relates to the use of the lubricating composition according to the invention for the passivation of at least one metal part of an engine, such as a two-stroke engine and in particular a two-stroke marine engine.
• the present invention also relates to a process for passivation of at least one metal part of an engine comprising at least one step of bringing said metal part into contact with the lubricating composition according to the invention.
• the present invention also relates to the use of a compound of formula
• (A) according to the invention in a lubricating composition comprising at least one base oil for the passivation of at least one metal part of an engine, such as a two-stroke engine and in particular a two-stroke marine engine.
• the present invention also relates to the use of a compound of formula
• (B) according to the invention in a lubricating composition comprising at least one oil base for the passivation of at least one metal part of an engine, such as a two-stroke engine and in particular a two-stroke marine engine.
• the metal part according to the invention is a cylinder or a piston.
• the metal part is made of cast iron.
• the engine according to the invention is a two-stroke engine.
• the engine is a two-stroke marine engine.
• the engine is an engine consuming heavy fuel oil.
• heavy fuel oil is understood to mean the heavy cuts resulting from the distillation of petroleum, optionally containing additives.
• the term "corrosion” means an alteration of a material, preferably metallic, by chemical reaction with an oxidant.
• this oxidant is an acid.
• this acid is sulfuric acid H2SO4.
• titanium corrosion means a process leading to the degradation and wear of a metallic material under the combined action of friction and corrosion as defined above.
• the compound of formula (A) defined in the present invention is used in a cylinder lubricating composition for reducing acid tribocorrosion on the cylinders and pistons of a two-stroke engine, such as a two-stroke marine engine. .
• the compound of formula (B) defined in the present invention is used in a cylinder lubricating composition to decrease acid tribocorrosion on the cylinders and pistons of a two-stroke engine, such as a two-stroke marine engine. -time.
• Figure 1 shows the depth profiles of the cast iron plates obtained after a tribological test carried out in the presence of the lubricating composition according to the invention CL2 and the comparative composition CC1.
• Example 1 Lubricating compositions
• compositions of Table 2 (LC: lubricating composition according to the invention; CC: comparative lubricating composition) were prepared by mixing the dispersant and / or detergents and the additive in a base oil at 60 ° C.
• the tribological tests were carried out on a reciprocating Biceri tribometer using steel rods (EN31) with a diameter of 6 mm and a radius of curvature of 50 mm, and cast iron plates (FT 25) polished with 800 grit sandpaper SiC.
• the steel rods were also polished to obtain a roughness Ra of between 50 and 100 nm.
• the areas of the cast iron trays outside the friction have been coated with a resin. This resin is removed at the end of the tests. In this way, the areas covered by the resin are not corroded during the tests and serve as a standard to measure the depth of wear marks due to corrosion phenomena.
• the lubricating composition Before each test, the lubricating composition is heated to 100 ° C and brought into contact with a 5M sulfuric acid solution (27% by mass) at room temperature by means of a "T" assembly.
• the lubricating composition arrives through the main channel and the acid solution is supplied through a channel perpendicular to the main channel.
• the corrosion products are removed with an ethylenediaminetetraacetic acid (EDTA) solution, and the wear of the cast iron plates is analyzed by white light interferometry, which allows to obtain a 3D profile. of the wear scar produced by corrosion and / or tribocorrosion.
• EDTA ethylenediaminetetraacetic acid
• Figure 1 shows the depth profiles of the cast iron plates obtained after a tribological test as described above and carried out in the presence of the lubricating composition according to the invention CL2 and the comparative composition CC1.
• compositions according to the invention make it possible to effectively protect the cast iron plate, both against corrosion (areas out of contact) and tribocorrosion (contact zone).

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• Oil, Petroleum & Natural Gas (AREA)
• Organic Chemistry (AREA)
• Lubricants (AREA)
• Preventing Corrosion Or Incrustation Of Metals (AREA)
• Inorganic Chemistry (AREA)

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• 2019
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