US3787305A - Method of applying a coating to a part - Google Patents

Method of applying a coating to a part Download PDF

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Publication number
US3787305A
US3787305A US00261814A US3787305DA US3787305A US 3787305 A US3787305 A US 3787305A US 00261814 A US00261814 A US 00261814A US 3787305D A US3787305D A US 3787305DA US 3787305 A US3787305 A US 3787305A
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US
United States
Prior art keywords
coating
heating
base material
high temperature
acrylic resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00261814A
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English (en)
Inventor
N Ballard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rolls Royce PLC
Original Assignee
Rolls Royce 1971 Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rolls Royce 1971 Ltd filed Critical Rolls Royce 1971 Ltd
Application granted granted Critical
Publication of US3787305A publication Critical patent/US3787305A/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process

Definitions

  • the present invention provides a method of applying a particular high temperature resistant coating to a steel part.
  • a method of applying a coating to a steel part comprises electrophoretically applying a coating of aluminum powder and organic resin to the part, heating the part to drive off the organic resin, and subsequently impregnating the coating with a high temperature resistant base material.
  • the high temperature resistant base material is preferably potassium silicate. In this case it is preferable to stove the impregnated coating.
  • the initial coating is performed from an aqueous solution.
  • the electrophoretic coating may be performed from a solution comprising one part of an acrylic resin, from 2 to 20 parts by weight offine powdered aluminum and water to make a workable consistency.
  • EXAMPLE 1 100 grams of a 50 percent aqueous solution of acrylic resin known as Synocryl 84/S and obtained from Messrs. Cray Valley Products was mixed with 400 grams fine powdered grease free aluminum of particle size to'l0 microns (400 grade) and 250 grams of water. The mixture was ball milled for one hour to produce a homogenous mixture.
  • Test panels of 12 percent chromium steel were immersed in the mixture and an electric potential applied between the panels and a fixed electrode so that the panels were given negative polarity and consequently were coated with the aluminum and resin by electrophoresis.
  • a current density of 0.1 amps per square inch gave best results, and the coatingwas continued for 30 seconds to give a coating of between 0.4 and 0.8 thousandths of an inch thickness.
  • test panels were then removed from the mixture and the coating was stoved for 30 minutes at 150C.
  • the panels were then further heated to 560C; this caused the acrylic resin to be driven off and also diffused the aluminum coating. This temperature was maintained for two hours.
  • the panels were then provided with a porous aluminum coating, to complete the coating the panels were allowed to cool to 100C and an aqueous solution of potassium silicate comprising 1 part by volume of the silicate in 2 parts by volume of water was brushed onto the coating until it had completely filled the pores of the aluminum. The panels were then finally stoved for 30 minutes at 150C.
  • the actual potassium silicate used was Crosfield Grade 66 having a mean molecular ratio of SiO :K O of 3.21 and a specific gravity of 1.33.
  • Test panels which had been thus coated were then subjected to corrosive conditions to evaluate the coating. Each panel was subjected to 10 cycles of a heating programme which involved two hours heating at 450C followed by 22 hours of neutral salt spray at room temperature. After this test the test panels were in good condition and the coating was almost undamaged as was the steel substrate. The panels were also tested by immersion in various fluids which are often used in or adjacent to gas turbine engines such as lubricating oils, kerosene and petroleum fuels and various hydraulic fluids, and the coating was found to be resistant to all these fluids.
  • EXAMPLE 2 Further tests were carried out on panels whose coating had been produced using the same mixtures but a different heating cycle. In this case the panels were electrophoretically coated, stoved for 30 minutes at 150C and then heated to 350C to drive off the acrylic resin. The porous coating was then impregnated and heat treated as before. We found equally satisfactory results with these test panels.
  • EXAMPLE 3 Further test panels were coated using a mixture comprising 31 grams of Synolac 84l/S as described above, 41.6 grams of the 400 grade aluminum powder and 27.3 grams of distilled water. The test pieces were coated by electrophoresis (or electro-printing) using an electrical current in the range of 5 to milliamps per square inch.
  • test panels were then stoved and further coated as described in the previous examples, and were found to give satisfactory results in similar tests. It was additionally found that the mixture itself was less liable to settling out of the solid constituents than the previous mixture.
  • the process of electrophoresis or electro-printing may be carried out using a contrast current or a contrast voltage supply; in the latter case the current will vary over the coating process.
  • the parameters of current and voltage which give the best results for a particular mixture are best determined by experiment, but we find that the current used will normally fall within the range 5 to 100 milliamps per square inch of surface to be cov ered.
  • the coating should be such as to be electrically conductive so as to give galvanic resistance to corrosion. It is possible to arrange that the coating is conductive by the addition of a final heat treatment step in which the panel involved is heated to 560C for 2 hours, as was seen in the following example.
  • EXAMPLE 4 Test panels were made and coated in exactly the same manner as Example 1, but in this case after the final stoving the panels were further heat treated to 560C in air for 2 hours. The panels were tested and it was found that the coatings were electrically conductive and gave even better protection than the panels of Example 1.
  • a method of applying a coating to a steel part comprising the steps of firstly electrophoretically applying a coating of a mixture of aluminum powder and organic resin to the part, secondly heating the part to drive off the organic resin, and thirdly impregnating the coating with a high temperature resistant base material.
  • a method as claimed in claim 4 and in which said subsequent heating comprises heating in air to 560C for 2 hours.
  • a method of applying a high temperature and corrosion resistant coating to a steel part comprising the steps of:

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)
  • Laminated Bodies (AREA)
US00261814A 1971-06-17 1972-06-12 Method of applying a coating to a part Expired - Lifetime US3787305A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2836971 1971-06-17

Publications (1)

Publication Number Publication Date
US3787305A true US3787305A (en) 1974-01-22

Family

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Family Applications (1)

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US00261814A Expired - Lifetime US3787305A (en) 1971-06-17 1972-06-12 Method of applying a coating to a part

Country Status (6)

Country Link
US (1) US3787305A (enrdf_load_html_response)
JP (1) JPS5339451B1 (enrdf_load_html_response)
DE (1) DE2229896C3 (enrdf_load_html_response)
FR (1) FR2142078B1 (enrdf_load_html_response)
GB (1) GB1341899A (enrdf_load_html_response)
IT (1) IT959840B (enrdf_load_html_response)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2366378A1 (fr) * 1974-02-27 1978-04-28 Alloy Surfaces Co Inc Procede de protection de pieces par revetement diffuse, et pieces ainsi formees
US4141760A (en) * 1972-11-06 1979-02-27 Alloy Surfaces Company, Inc. Stainless steel coated with aluminum
DE2903080A1 (de) * 1978-01-27 1979-08-02 Toyo Kogyo Co Verfahren zur ausbildung einer aluminiumueberzugsschicht auf einem eisenlegierungswerkstueck
US4618406A (en) * 1978-10-17 1986-10-21 Hitachi, Ltd. Graphite-coated tube and process for producing the same
US5591691A (en) * 1994-05-23 1997-01-07 W. R. Grace & Co.-Conn. Metal foil catalyst members by aqueous electrophoretic deposition
US5795456A (en) * 1996-02-13 1998-08-18 Engelhard Corporation Multi-layer non-identical catalyst on metal substrate by electrophoretic deposition
US5884388A (en) * 1995-05-12 1999-03-23 Aluminum Company Of America Method for manufacturing a friction-wear aluminum part
US5985220A (en) * 1996-10-02 1999-11-16 Engelhard Corporation Metal foil having reduced permanent thermal expansion for use in a catalyst assembly, and a method of making the same
FR3128471A1 (fr) 2021-10-26 2023-04-28 Safran Aircraft Engines Procédé de formation d’un revêtement de protection cathodique sur une pièce de turbomachine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1497559A (en) * 1975-08-29 1978-01-12 Rolls Royce Method of applying a coating to a steel part

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3630869A (en) * 1969-12-02 1971-12-28 Du Pont Process for electrodepositing metal-silicate coatings
US3676308A (en) * 1969-06-19 1972-07-11 Udylite Corp Electrolytic codeposition of polyvinylidene and copolymer particles with copper

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3676308A (en) * 1969-06-19 1972-07-11 Udylite Corp Electrolytic codeposition of polyvinylidene and copolymer particles with copper
US3630869A (en) * 1969-12-02 1971-12-28 Du Pont Process for electrodepositing metal-silicate coatings

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4141760A (en) * 1972-11-06 1979-02-27 Alloy Surfaces Company, Inc. Stainless steel coated with aluminum
FR2366378A1 (fr) * 1974-02-27 1978-04-28 Alloy Surfaces Co Inc Procede de protection de pieces par revetement diffuse, et pieces ainsi formees
DE2903080A1 (de) * 1978-01-27 1979-08-02 Toyo Kogyo Co Verfahren zur ausbildung einer aluminiumueberzugsschicht auf einem eisenlegierungswerkstueck
US4618406A (en) * 1978-10-17 1986-10-21 Hitachi, Ltd. Graphite-coated tube and process for producing the same
US5591691A (en) * 1994-05-23 1997-01-07 W. R. Grace & Co.-Conn. Metal foil catalyst members by aqueous electrophoretic deposition
US5604174A (en) * 1994-05-23 1997-02-18 W. R. Grace & Co.-Conn. Metal foil catalyst members by aqueous electrophoretic deposition
US5884388A (en) * 1995-05-12 1999-03-23 Aluminum Company Of America Method for manufacturing a friction-wear aluminum part
US5795456A (en) * 1996-02-13 1998-08-18 Engelhard Corporation Multi-layer non-identical catalyst on metal substrate by electrophoretic deposition
US5985220A (en) * 1996-10-02 1999-11-16 Engelhard Corporation Metal foil having reduced permanent thermal expansion for use in a catalyst assembly, and a method of making the same
FR3128471A1 (fr) 2021-10-26 2023-04-28 Safran Aircraft Engines Procédé de formation d’un revêtement de protection cathodique sur une pièce de turbomachine
WO2023073310A1 (fr) 2021-10-26 2023-05-04 Safran Aircraft Engines Procede de formation d'un revetement de protection cathodique sur une piece de turbomachine
US20240328025A1 (en) * 2021-10-26 2024-10-03 Safran Aircraft Engines Method for forming a cathodic protection coating on a turbomachine part
US12168836B2 (en) * 2021-10-26 2024-12-17 Safran Aircraft Engines Method for forming a cathodic protection coating on a turbomachine part

Also Published As

Publication number Publication date
FR2142078B1 (enrdf_load_html_response) 1977-12-23
JPS5339451B1 (enrdf_load_html_response) 1978-10-21
DE2229896A1 (de) 1972-12-21
GB1341899A (en) 1973-12-25
IT959840B (it) 1973-11-10
DE2229896B2 (enrdf_load_html_response) 1979-02-22
DE2229896C3 (de) 1979-10-31
FR2142078A1 (enrdf_load_html_response) 1973-01-26

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