US20150093065A1 - Anti-fretting additives for non-lubricated contact surfaces - Google Patents

Anti-fretting additives for non-lubricated contact surfaces Download PDF

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US20150093065A1
US20150093065A1 US14/381,265 US201314381265A US2015093065A1 US 20150093065 A1 US20150093065 A1 US 20150093065A1 US 201314381265 A US201314381265 A US 201314381265A US 2015093065 A1 US2015093065 A1 US 2015093065A1
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Prior art keywords
fretting
rust preventative
bearing assembly
percent
additive
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US14/381,265
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Inventor
Gary Doll
Peter Drechsler
Carl Hager
Ryan Evans
Paul Shiller
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Timken Co
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Timken Co
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Priority to US14/381,265 priority Critical patent/US20150093065A1/en
Assigned to THE TIMKEN COMPANY reassignment THE TIMKEN COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DRECHSLER, PETER, HAGER, CARL, DOLL, GARY, EVANS, RYAN, SHILLER, PAUL
Publication of US20150093065A1 publication Critical patent/US20150093065A1/en
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
    • C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
    • 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
    • C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
    • C10M141/10—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic phosphorus-containing compound
    • 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
    • C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
    • C10M141/12—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic compound containing atoms of elements not provided for in groups C10M141/02 - C10M141/10
    • 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
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
    • C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
    • C23F11/12—Oxygen-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
    • C23F11/18—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using inorganic inhibitors
    • C23F11/182—Sulfur, boron or silicon containing compounds
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
    • C23F11/18—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using inorganic inhibitors
    • C23F11/184—Phosphorous, arsenic, antimony or bismuth containing compounds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/52—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
    • F16C33/6688—Lubricant compositions or properties, e.g. viscosity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • 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
    • C10M2223/045—Metal containing thio derivatives
    • 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
    • C10M2227/00—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
    • C10M2227/06—Organic compounds derived from inorganic acids or metal salts
    • C10M2227/061—Esters derived from boron
    • 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
    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/12—Groups 6 or 16
    • 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
    • C10N2040/02—Bearings

Definitions

  • the present invention relates to treatments for non-lubricated contact surfaces such as “fixed” metal-to-metal joints in bearing assemblies, for example a shaft fitted into the bore of an inner ring, or the outer surface of an outer ring fitted into a housing.
  • These “fixed” joints are typically press-fitted or shrink-fitted together and generally intended to eliminate movement therebetween.
  • With small-bore size bearings it is usually not a challenge to achieve adequate interference fits (sometimes referred to as tight fits) to prevent or inhibit fretting wear.
  • achieving sufficient interference fits with large bore bearings can be significantly more difficult. Repetitive oscillatory movements of small amplitude can occur between the surfaces of the interference fit due to certain torque and/or vibration occurrences during operation of the bearing assembly.
  • fretting wear is initiated by adhesion and rupture of contacting asperities. Fretting wear can also be amplified by oxidation or corrosion and then manifest as abrasive wear. Thus, fretting wear is a common concern for interference fits for inner and outer rings in large bore bearings. Fretting wear can further result in seizure of components by corrosion and abrasion damage and/or by adhesion and welding between the parts.
  • the contact surfaces are not fitted with a running clearance and generally must not rotate relative to one another, commercially available greases or lubricants cannot be used to prevent the fretting wear. As such, these contact surfaces represent a “dry” friction situation.
  • the only substance present in the metal-to-metal joint is a thin coating of rust preventative oil applied after manufacturing.
  • the rust preventative oil does not have properties that significantly protect the surfaces from fretting wear damage.
  • a standard practice used by some bearing manufacturers to reduce the risk of fretting wear of large bore bearings is to apply a coating of a low friction material, covering the metal bearing ring surface that is susceptible to the fretting wear.
  • a Teflon®-based coating or a chromium-based coating may be provided such that true metal-on-metal contact is avoided.
  • these coatings are believed to be effective at reducing the risk of fretting wear, adding a coating to the bearing ring(s) is costly and adds complexity to the manufacturing process.
  • the invention provides an anti-fretting rust preventative solution that includes a rust preventative fluid and an anti-fretting additive dissolved in the rust preventative fluid.
  • the anti-fretting additive includes at least one compound that is surface-active with steel to produce a low-shear velocity accommodation layer in a metal-to-metal interference fit.
  • the invention provides a bearing assembly with anti-fretting properties.
  • the bearing assembly includes a shaft, an inner ring secured to the shaft with a first interference fit, a housing including a bore, an outer ring secured in the bore of the housing with a second interference fit, and an anti-fretting rust preventative solution provided in at least the first and second interference fits.
  • the anti-fretting rust preventative solution includes a rust preventative fluid and an anti-fretting additive dissolved in the rust preventative fluid.
  • the anti-fretting additive including at least one compound that is surface-active with steel to produce a low-shear velocity accommodation layer.
  • FIG. 1 illustrates conformal fretting wear test friction results of 5 percent tri-isopropyl borate in a rust preventative oil.
  • FIG. 2 illustrates conformal fretting wear test temperature results of 5 percent tri-isopropyl borate in a rust preventative oil.
  • FIG. 3 is an illustrative summary of the conformal fretting testing of 5 percent tri-isopropyl borate in a rust preventative oil.
  • FIG. 4 is a perspective view of a conventional bearing assembly.
  • FIG. 4 illustrates a typical bearing assembly 10 including an inner ring 12 , a shaft 14 secured within a bore 12 A of the inner ring 12 , an outer ring 16 , and a housing 18 having a bore 18 A in which the outer ring 16 is secured.
  • the inner ring 12 and the outer ring 16 have a low friction coupling therebetween, such as rolling elements (not shown).
  • the bore 12 A of the inner ring 12 has an interference fit with the shaft 14 to inhibit relative rotation between the inner ring 12 and the shaft 14 .
  • the outer ring 16 has an interference fit with the bore 18 A of the housing 18 to inhibit relative rotation between the outer ring 16 and the housing 18 .
  • the interference fits can be achieved by press-fitting or shrink-fitting.
  • the bearing assembly 10 can be a large size bearing assembly in which the bore 12 A of the inner ring 12 is greater than about 200 mm. It should be understood that certain applications may require only one bearing ring, and thus a single metal-to-metal interference fit.
  • a rust preventative (RP) fluid is provided on the surfaces of the inner and outer rings 12 , 16 .
  • the RP fluid may also be provided on one or both of the shaft 14 and the housing 18 .
  • the RP fluid can be a hydrocarbon-based fluid (or water-based rust preventative fluid) that wets the surfaces of the inner and outer rings 12 , 16 .
  • Hydrocarbon-based fluids can include petroleum-based fluids (e.g., a thin oil with kerosene-like consistency) or non-petroleum-based fluids (e.g., vegetable or plant oils, synthetics, etc.) or water soluble oil or water-based synthetic rust preventative solution.
  • Suitable RP's include but are not limited to Quaker FERROCOTE® 5856 BF and Quaker FERROCOTE® 5856 BF T1.
  • at least one additive is added to the RP to form a solution.
  • Such additives can include at least one of a boron compound (e.g., boric acid, salts of boric acid such as sodium borate, a borate ester, a boronic ester, or a bonnie ester) and an extreme pressure (EP) additive (e.g., molybdenum dithiophosphate “MoDTP”).
  • a boron compound e.g., boric acid, salts of boric acid such as sodium borate, a borate ester, a boronic ester, or a bonnie ester
  • EP extreme pressure
  • MoDTP molybdenum dithiophosphate
  • the additive can include at least one tri-alkyl borate where the alkyl group is any straight or branched alkyl group similar to but not limited to ethyl, n-butyl, iso-butyl, tert-butyl, n-pentyl, iso-pentyl, etc. (e.g., tri-alkyl borates like tri-isopropyl borate or tri-propyl borate).
  • the anti-fretting additive stays in solution in the RP fluid so that fretting wear protection is provided when at least one of the inner ring 12 and the shaft 14 , which are assembled into the first interference fit, and at least one of the outer ring 16 and the housing 18 , which are assembled into the second interference fit, are wetted with the RP.
  • one or both of the inner ring 12 and the shaft 14 and one or both of the outer ring 16 and the housing 18 are steel, and the anti-fretting additive can be surface-active with steel (i.e., subject to a chemical reaction in a steel-on-steel concentrated contact) to produce a shear deformation layer, or “low-shear velocity accommodation layer”, such that when two surfaces move relative to each other, the sliding interface resides in the low-shear velocity accommodation layer.
  • Low-shear velocity accommodation layers are discussed in detail in Y. Berthier, M. Godet & M. Brendle (1989): Velocity Accommodation in Friction, Tribology Transactions, 32:4, 490-496, which is incorporated by reference herein.
  • velocity accommodation layer refers to a layer between two bodies or surfaces that enhances the ability for movement (i.e., non-zero velocity) therebetween.
  • boron compounds dissolved in the RP fluid can be surface-active with steel to produce a velocity accommodation layer of boric acid.
  • MoDTP as an additive is surface-active with steel to produce a velocity accommodation layer of molybdenum disulfide MoS 2 .
  • Boron compounds such as tri-isopropyl borate and tri-propyl borate and some EP additives like MoDTP have been observed in the inventors' labs to function well as velocity accommodation layers in the kind of reciprocating contact that causes fretting. Experimental testing has shown this methodology to be extremely effective at inhibiting fretting wear without sacrificing the inherent corrosion protection of the RP.
  • the testing disclosed herein was conducted on four different solutions.
  • the four solutions were created by combining (e.g., dissolving) one of two additives (tri-isopropyl borate and 2-ethylhexyl molybdenum dithiophosphate) as a solute at 5 percent by total volume with one of two RP fluids (FERROCOTE® 5856 BF T1 and FERROCOTE® 5856 BF) as a solvent.
  • the FERROCOTE® 5856 BF T1 RP fluid is the same as or similar to the FERROCOTE® 5856 BF, further diluted with a solvent.
  • the tests were replicated at least twice.
  • the Fafnir test was run according to the ASTM procedure and the conformal fretting wear test was run according to the following parameters:
  • the Fafnir test is most commonly used as a grease test so the preparation was modified to give testing conditions closer to that of the actual rust preventative conditions in the field.
  • Samples were ultrasonically cleaned in Hexanes and Isopropanol.
  • a thin layer of FERROCOTE® 5856 BF or FERROCOTE® 5856 BF plus 5 percent tri-isopropyl borate was applied to the surfaces of the inner and outer ring. All excess was wiped off or allowed to drip off (e.g., for 5 minutes).
  • a 0.1 mL drop of the test solution was placed on the top of the test ring prior to mounting the outer ring. Multiple tests were conducted on each solution.
  • the Fafnir test measures weight loss. The larger the weight loss, the larger the fretting wear. The results are tabulated here.
  • ASTM D-4170 is designed to test greases and the statistical evaluation in the documentation is correct for grease. This testing was performed on oil rust preventatives rather than grease, so we rely on statistical data drawn from the measurements.
  • the range of values found for the studies with FERROCOTE® 5856BF T1 for the baseline sample was 1.8 mg.
  • the range for the baseline sample in the FERROCOTE® 5856BF tests was 0.38 mg. The trend is similar in both tests that the additives did reduce fretting wear.
  • RP fluids additized as described herein can be direct replacements for RP fluids already in use.
  • the amount of the additives in an RP solution can be about, or at least about, 0.1, 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 percent by total volume (v/v), and about or less than about, 90, 80, 70, 60, 50, 40, 30, 20, or 10 percent by total volume (v/v), but other amounts can also be effective.
  • the amount can be between about 1 percent and about 10 percent by total volume (v/v), and more particularly, can be about 5 percent by total volume (v/v) in some constructions.
  • the rust preventing properties of the base RP fluid may begin to be sacrificed.
  • the additives will not cause corrosion, but there should be a minimum amount (e.g., about, or at least about, 10, 20, 30, 40, 50, 60, 70, 80 or 90 percent) of the base RP fluid necessary to perform the basic function of inhibiting corrosion.
  • the additized RP solution can be applied in any manner as RP fluids are typically applied. In some constructions, the parts are dipped and allowed to drain.
  • FERROCOTE® 5856BF and FERROCOTE® 5856BF T1 are given as examples herein, there is not necessarily a preference between the two, and those of ordinary skill in the art will realize that other known RP fluids can also be modified into solutions with anti-fretting additives as described herein.
  • fretting can occur between the rolling elements and the raceways of a bearing prior to installation in the application.
  • An anti-fretting RP solution as described herein can also reduce the risk of this type of wear occurring during shipping and storage, for example.
  • the fretting wear prevention due to the additives in RP solutions as described herein may also be used to mitigate fretting wear in other situations besides interference fits of bearing rings, and in metal components besides bearings altogether. Shipping of metallic parts often requires some form of fretting wear protection—either a lubricant such as grease or a physical barrier like plastic or cardboard.
  • the fretting wear protection from an anti-fretting RP solution as described herein can be great enough to be used alone in place of these other forms of fretting wear protection at a lower cost.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Lubricants (AREA)
  • Rolling Contact Bearings (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
US14/381,265 2012-03-22 2013-01-24 Anti-fretting additives for non-lubricated contact surfaces Abandoned US20150093065A1 (en)

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PCT/US2013/022904 WO2013141959A1 (en) 2012-03-22 2013-01-24 Anti-fretting additives for non-lubricated contact surfaces
US14/381,265 US20150093065A1 (en) 2012-03-22 2013-01-24 Anti-fretting additives for non-lubricated contact surfaces

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JP (1) JP6130902B2 (ja)
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