Patent EP0433999A2 successfully refreshed from Google Patents.
US4714529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating metal surfaces in oil-based lubricants
Assignee: VISCO US Inc A MO CORP
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Filing: 1985-12-16
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Granted: 1987-12-22
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Expires: 2005-12-16
Abstract
Abstract A method of using an electrochemical process in oil-based lubricants to form friction-reducing and wear-reducing iron phosphate films on metal surfaces. An electrolytic additive of dialkyl hydrogen phosphate is first added to the oil-based lubricant to improve its electrical conductance and to make it an ionic conductor. This method enables not only the formation of uniform iron phosphate films on metal surfaces but also the in-situ repair of such films after damage has occurred.
Inventors
- 👤 Su-Chee S. Wang
- 👤 Simon C. Tung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:33
CPC Classifications
F; F16; F16N; F16N15/00; C; C25; C25D; C25D11/00; C25D11/36
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
94 words
A method of forming a friction-reducing and wear-reducing film on the surface of a cast iron anode means spaced apart from a cathode means both immersed in an oil-based lubricant by an electrochemical process comprising the steps of blending an electrolytic additive of a dialkyl hydrogen phosphate into said oil-based lubricant such that sufficient electrical current may pass in said lubricant, passing an electrical current of sufficient current density between said anode and cathode means whereby a friction-reducing and wear-reducing film is formed substantially of iron phosphate on the surface of said anode means.
Claim 2
Independent Claim
94 words
A method of forming a friction-reducing and wear-reducing film on the surface of a cast iron anode means spaced apart from a cathode means both immersed in an oil-based lubricant by an electrochemical process comprising the steps of blending an electrolytic additive of a dialkyl hydrogen phosphate into said oil-based lubricant such that sufficient electrical current may pass in said lubricant, passing an electrical current of sufficient current density between said anode and cathode means whereby a friction-reducing and wear-reducing film is formed substantially of iron phosphate on the surface of said anode means.
Claim 3
Independent Claim
116 words
A method of forming a friction-reducing and wear-reducing film on the surface of a cast iron anode means spaced apart from a cathode means both immersed in an oil-based lubricant by an electrochemical process comprising the steps of blending a suitable amount of an electrolytic additive of a dialkyl hydrogen phosphate selected from the group consisting of dilauryl hydrogen phosphate and mixed-dialkyl acid orthophosphate into said oil-based lubricant such that sufficient electrical current may pass in said lubricant, passing an electrical current of sufficient magnitude between said anode and cathode means for a sufficient length of time whereby a friction-reducing and wear-reducing film is formed substantially of iron phosphate on the surface of said anode means.
Claim 4
Independent Claim
116 words
A method of forming a friction-reducing and wear-reducing film on the surface of a cast iron anode means spaced apart from a cathode means both immersed in an oil-based lubricant by an electrochemical process comprising the steps of blending a suitable amount of an electrolytic additive of a dialkyl hydrogen phosphate selected from the group consisting of dilauryl hydrogen phosphate and mixed-dialkyl acid orthophosphate into said oil-based lubricant such that sufficient electrical current may pass in said lubricant, passing an electrical current of sufficient magnitude between said anode and cathode means for a sufficient length of time whereby a friction-reducing and wear-reducing film is formed substantially of iron phosphate on the surface of said anode means.
Claim 5
Independent Claim
126 words
A method of forming a friction-reducing and wear-reducing film on the surface of a cast iron anode means spaced apart from a cathode means both immersed in an oil-based lubricant by an electrochemical process comprising the steps of blending between 0.1 to 20 weight percent of an electrolytic additive of a dialkyl hydrogen phosphate selected from the group consisting of dilauryl hydrogen phosphate and mixed-dialkyl acid orthophosphate into said oil-based lubricant such that sufficient electrical current may pass in said lubricant, passing an electrical current having a current density between 0.001 to 1000 micro-amp/cm 2 between said anode and cathode means for a sufficient length of time whereby a friction-reducing and wear-reducing film is formed substantially of iron phosphate on the surface of said anode means.
Claim 6
Independent Claim
126 words
A method of forming a friction-reducing and wear-reducing film on the surface of a cast iron anode means spaced apart from a cathode means both immersed in an oil-based lubricant by an electrochemical process comprising the steps of blending between 0.1 to 20 weight percent of an electrolytic additive of a dialkyl hydrogen phosphate selected from the group consisting of dilauryl hydrogen phosphate and mixed-dialkyl acid orthophosphate into said oil-based lubricant such that sufficient electrical current may pass in said lubricant, passing an electrical current having a current density between 0.001 to 1000 micro-amp/cm 2 between said anode and cathode means for a sufficient length of time whereby a friction-reducing and wear-reducing film is formed substantially of iron phosphate on the surface of said anode means.
Claim 7
Independent Claim
128 words
A method of forming a friction-reducing and wear-reducing film on the surface of an anode means spaced apart from a cathode means both immersed in an oil-based lubricant by an electrochemical process comprising the steps of blending between 1 to 5 weight percent of an electrolytic additive of a dialkyl hydrogen phosphate selected from the group consisting of dilauryl hydrogen phosphate and mixed-dialkyl acid orthophosphate into said oil-based lubricant such that sufficient electrical current may pass in said lubricant, passing an electrical current having a current density between 0.01 to 100 micro-amp/cm 2 between said anode and cathode means for a period of time between 200 to 1 minutes whereby a friction-reducing and wear-reducing film is formed substantially of iron phosphate on the surface of said anode means.
Claim 8
Independent Claim
128 words
A method of forming a friction-reducing and wear-reducing film on the surface of an anode means spaced apart from a cathode means both immersed in an oil-based lubricant by an electrochemical process comprising the steps of blending between 1 to 5 weight percent of an electrolytic additive of a dialkyl hydrogen phosphate selected from the group consisting of dilauryl hydrogen phosphate and mixed-dialkyl acid orthophosphate into said oil-based lubricant such that sufficient electrical current may pass in said lubricant, passing an electrical current having a current density between 0.01 to 100 micro-amp/cm 2 between said anode and cathode means for a period of time between 200 to 1 minutes whereby a friction-reducing and wear-reducing film is formed substantially of iron phosphate on the surface of said anode means.
References Cited (Backward Citations)
US870937A
Cited
US2927068A
Cited
US3262867A
Cited
US3484344A
Cited
US3409525A
Cited
US3479260A
Cited
US4522892A
Cited
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