US3637354A - Trim members - Google Patents

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US3637354A
US3637354A US860541A US3637354DA US3637354A US 3637354 A US3637354 A US 3637354A US 860541 A US860541 A US 860541A US 3637354D A US3637354D A US 3637354DA US 3637354 A US3637354 A US 3637354A
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aluminum
stainless steel
conversion coating
body member
conversion
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US860541A
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Donald R Zaremski
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Allegheny Ludlum Corp
Pittsburgh National Bank
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Allegheny Ludlum Steel Corp
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Assigned to ALLEGHENY LUDLUM CORPORATION reassignment ALLEGHENY LUDLUM CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). 8-4-86 Assignors: ALLEGHENY LUDLUM STEEL CORPORATION
Assigned to PITTSBURGH NATIONAL BANK reassignment PITTSBURGH NATIONAL BANK SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALLEGHENY LUDLUM CORPORATION
Assigned to PITTSBURGH NATIONAL BANK reassignment PITTSBURGH NATIONAL BANK ASSIGNMENT OF ASSIGNORS INTEREST. RECORDED ON REEL 4855 FRAME 0400 Assignors: PITTSBURGH NATIONAL BANK
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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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/34—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
    • C23C22/37—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides containing also hexavalent chromium 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
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/922—Static electricity metal bleed-off metallic stock
    • Y10S428/923—Physical dimension
    • Y10S428/924—Composite
    • Y10S428/926—Thickness of individual layer specified
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S428/00—Stock material or miscellaneous articles
    • Y10S428/922—Static electricity metal bleed-off metallic stock
    • Y10S428/9265—Special properties
    • Y10S428/933—Sacrificial component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12354—Nonplanar, uniform-thickness material having symmetrical channel shape or reverse fold [e.g., making acute angle, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12389—All metal or with adjacent metals having variation in thickness
    • Y10T428/12396—Discontinuous surface component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
    • Y10T428/12583—Component contains compound of adjacent metal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12736—Al-base component
    • Y10T428/1275—Next to Group VIII or IB metal-base component
    • Y10T428/12757—Fe

Definitions

  • the present invention relates to stainless steel composites in the form of trim members and more particularly to conversion-coated, aluminum-striped stainless steel composites in the form of trim members. It further relates to conversioncoated, aluminum-striped stainless steel composites suitable for fabrication into trim members and to assemblies comprised of conversion-coated, aluminum-striped stainless steel trim members in combination with body members.
  • Stainless steel is known to serve a particularly good purpose in those applications where brightness and stain resistance to a variety of contaminants is required and is ideally suited for use as automotive trim.
  • the use of stainless steel can result in galvanic corrosion.
  • Carbon steel is anodic to stainless steel and generally corrodes in the vicinity of stainless steel in the presence of an electrolyte, such as moisture.
  • FIG. 1 is a sectional view of a stainless steel trim member
  • FIG. 2 is a perspective view of a stainless steel trim member.
  • the present invention encompasses a composite suitable for fabrication into a stainless steel trim member, a composite in the form of a stainless steel trim member, a method for producing stainless steel trim members and an assembly comprising a stainless steel trim member in combination with a body member.
  • the body member is comprised of metal, e.g., plain carbon steel, which is less noble in the electromotive series than stainless steel.
  • metal is interpreted as including metal which is painted and coated as well as bare.
  • the stainless steel trim member has a contact surface and an exposure surface.
  • the contact surface abuts the body member after assembly and the exposure surface is subject to view.
  • Adhered to the contact surface is a layer of aluminum.
  • the aluminum is generally at least 0.5 of a mil thick and preferably between 3 and 5 mils. Covering the aluminum is a conversion coating from the group consisting of chromate and phosphate conversion coatings.
  • FIGS. 1 and 2 are respectively a sectional and perspective view of a stainless steel trim member 1 which meets the requirements of this invention. It comprises an exposed surface 2, contact surfaces 4, aluminum stripes 6, and conversion coatings 8.
  • the method of this invention includes the steps of shaping a stainless steel sheet into a trim member having an exposed surface and at least one contact surface and adhering aluminum to those portions of the sheet which are the contact surfaces of the finally formed trim member. Any of the well-known methods of shaping, e.g., roll forming, and adhering; e.g., roll pressure bonding, are within the scope of this invention.
  • the method additionally involves the step of applying a conversion coating to the aluminum either before or after shaping. It can be any of the well-known chromate or phosphate conversion coatings.
  • a typical chromate conversion coating consists of 0.99 ounces of sodium dichromate, 0.132 ounces of sodium fluoride, 0.66 ounces of potassium ferricyanide, 3 cubic centimeters of nitric acid, and 1 gallon of water. It is applied at a temperature between ambient and l30 F. for a period of time between 5 seconds and 8 minutes.
  • a typical phosphate conversion coating consists of 1 gallon of water and 10-20 ounces of solution composed of 61.7 percent ammonium phosphate, 22.9 percent ammonium fluoride, and 15.4 percent potassium dichromate. It is applied at a temperature between 1 l0 and 120 F. for a period of time between I and 5 minutes.
  • a number of stainless steel trim members were prepared withstripes of aluminum adhered to their contact surface. Half of the trim members were assembled onto carbon steel body members without further treatment. The other half were given a chromate conversion coating prior to assembly. Coating was accomplished by dipping the aluminum stripes into a bath maintained at ambient temperature. Immersion times ranged from 1 to 3 minutes. The bath contained Iridite No. l42, a chromate conversion coating sold by Allied Research Products, Inc., Baltimore, Md.
  • All of the assemblies i.e., those with and those without chromate conversion coatings, were subject to salt spray tests in order to demonstrate the effectiveness of the conversion coatings. These tests are considered to be accelerated tests insofar as they produce corrosive conditions far more severe than those encountered by automotive bodies under normal road conditions.
  • Aluminum corrosion products were well in evidence on the untreated assemblies, i.e., those without chromate conversion coatings, after 24 hours of testing.
  • the treated assemblies, i.e., those with chromate conversion coatings were essentially free of aluminum corrosion products after hours of testing and provided the carbon steel body member with galvanic protection equivalent to that provided by the untreated assemblies.
  • An assembly comprising a stainless steel trim member in combination with a first metal less noble in the electromotive series than stainless steel; said stainless steel trim member having an exposed surface and a contact surface abutting said first metal, a layer of aluminum adhering to said contact surface, said aluminum being less noble in the electromotive series than said first metal, and a conversion coating from the group consisting of chromate and phosphate conversion coatings on said aluminum. said coated aluminum acting to preclude galvanic action between said first metal and said stainless steel.
  • a composite article according to claim 7 having at least two spaced-apart stripes of aluminum.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Laminated Bodies (AREA)

Abstract

The application describes assemblies comprised of a body member in combination with a stainless steel trim member having a contact surface which abuts the body member and an exposure surface subject to view. Adhered to the contact surface and located between the contact surface and the body member is a layer of aluminum which provides galvanic protection for the body member. Covering the aluminum is a chromate or phosphate conversion coating which provides protection against aluminum galvanic corrosion without detrimentally affecting the galvanic protection which aluminum provides for the body member. Also described are conversion-coated, aluminum-striped stainless steel composites suitable for fabrication into trim members and a method for producing conversion-coated, aluminum-striped stainless steel trim members.

Description

United States Patent 1151 3,6 Zaremski [451 Jan. 25, 1972 [54] TRIM MEMBERS Attorney-Richard A. Speer, Vincent G. Gioia and Howard R.
B k t k, [72] Inventor: Donald R. Zaremski, Cheswick, Pa. er ens 0c Jr [73] Assignee: Allegheny Ludlum Steel Corporation, Pitt- [57] ABSTRACT sburgh' The application describes assemblies comprised of a body [22] Filed; Sept 24 19 9 member in combination with a stainless steel trim member Appl. No.: 860,541
Primary Examiner-L. Dewayne Rutledge Assistant ExaminerE. L. Weise having a contact surface which abuts the body member and an exposure surface subject to view. Adhered to the contact surface and located between the contact surface and the body member is a layer of aluminum which provides galvanic protection for the body member. Covering the aluminum is a chromate or phosphate conversion coating which provides protection against aluminum galvanic corrosion without detrimentally affecting the galvanic protection which aluminum provides for the body member. Also described are conversioncoated, aluminum-striped stainless steel composites suitable for fabrication into trim members and a method for producing conversion-coated, aluminum-striped stainless steel trim members.
12 Claims, 2 Drawing Figures PATENTED JAN25 I972 INVEN TOR. DONALD R. ZAREMSK/ Attorney TRIM MEMBERS The present invention relates to stainless steel composites in the form of trim members and more particularly to conversion-coated, aluminum-striped stainless steel composites in the form of trim members. It further relates to conversioncoated, aluminum-striped stainless steel composites suitable for fabrication into trim members and to assemblies comprised of conversion-coated, aluminum-striped stainless steel trim members in combination with body members.
Stainless steel is known to serve a particularly good purpose in those applications where brightness and stain resistance to a variety of contaminants is required and is ideally suited for use as automotive trim. However, since most automotive bodies are constructed of carbon steel, the use of stainless steel can result in galvanic corrosion. Carbon steel is anodic to stainless steel and generally corrodes in the vicinity of stainless steel in the presence of an electrolyte, such as moisture.
To protect carbon steel it has been the practice to coat stainless strips with a nonferrous sacrificial metal which is anodic to mild carbon steel prior to or after forming the strips into trim members. The coating is preferably aluminum. It is applied to those sections of the strip which will eventually contact the automotive body, i.e., the return flange of the fabricated trim member.
Testing under normal road conditions has indicated that the use of aluminum solves the galvanic corrosion problem faced by automotive manufacturers. However, when the aluminum corrodes, it results in the formation and bleeding of aesthetically objectionable aluminum corrosion products (white corrosion products).
I have discovered that the formation and bleeding of aluminum corrosion products can be minimized without adversely affecting the galvanic protection provided by the aluminum, through application of a protective chromate or phosphate conversion coating to the aluminum. These coatings have been applied in nonrelated environments to aluminum for protection against general corrosion and to very thin layers of zinc, for protection against galvanic corrosion. My work has shown that they offer protection against aluminum galvanic corrosion without detrimentally affecting the galvanic protection which aluminum provides for carbon steel in the vicinity of stainless steel.
It is accordingly an object of this invention to provide a conversion-coated, aluminum-striped stainless steel composite.
It is a further object of this invention to provide an assembly comprised of a body member in combination with a conversion-coated, aluminum-striped stainless steel trim member which provides galvanic protection for the body member.
The foregoing and other objects of the invention will be best understood from the following description, reference being had to the accompanying drawing, wherein:
FIG. 1 is a sectional view of a stainless steel trim member; and
FIG. 2 is a perspective view of a stainless steel trim member.
The present invention encompasses a composite suitable for fabrication into a stainless steel trim member, a composite in the form of a stainless steel trim member, a method for producing stainless steel trim members and an assembly comprising a stainless steel trim member in combination with a body member. The body member is comprised of metal, e.g., plain carbon steel, which is less noble in the electromotive series than stainless steel. In the context of this application, the term metal is interpreted as including metal which is painted and coated as well as bare.
The stainless steel trim member has a contact surface and an exposure surface. The contact surface abuts the body member after assembly and the exposure surface is subject to view. Adhered to the contact surface is a layer of aluminum. The aluminum is generally at least 0.5 of a mil thick and preferably between 3 and 5 mils. Covering the aluminum is a conversion coating from the group consisting of chromate and phosphate conversion coatings.
FIGS. 1 and 2 are respectively a sectional and perspective view of a stainless steel trim member 1 which meets the requirements of this invention. It comprises an exposed surface 2, contact surfaces 4, aluminum stripes 6, and conversion coatings 8.
The method of this invention includes the steps of shaping a stainless steel sheet into a trim member having an exposed surface and at least one contact surface and adhering aluminum to those portions of the sheet which are the contact surfaces of the finally formed trim member. Any of the well-known methods of shaping, e.g., roll forming, and adhering; e.g., roll pressure bonding, are within the scope of this invention. The method additionally involves the step of applying a conversion coating to the aluminum either before or after shaping. It can be any of the well-known chromate or phosphate conversion coatings. A typical chromate conversion coating consists of 0.99 ounces of sodium dichromate, 0.132 ounces of sodium fluoride, 0.66 ounces of potassium ferricyanide, 3 cubic centimeters of nitric acid, and 1 gallon of water. It is applied at a temperature between ambient and l30 F. for a period of time between 5 seconds and 8 minutes. A typical phosphate conversion coating consists of 1 gallon of water and 10-20 ounces of solution composed of 61.7 percent ammonium phosphate, 22.9 percent ammonium fluoride, and 15.4 percent potassium dichromate. It is applied at a temperature between 1 l0 and 120 F. for a period of time between I and 5 minutes.
The following example illustrates several aspects of the invention.
A number of stainless steel trim members were prepared withstripes of aluminum adhered to their contact surface. Half of the trim members were assembled onto carbon steel body members without further treatment. The other half were given a chromate conversion coating prior to assembly. Coating was accomplished by dipping the aluminum stripes into a bath maintained at ambient temperature. Immersion times ranged from 1 to 3 minutes. The bath contained Iridite No. l42, a chromate conversion coating sold by Allied Research Products, Inc., Baltimore, Md.
All of the assemblies, i.e., those with and those without chromate conversion coatings, were subject to salt spray tests in order to demonstrate the effectiveness of the conversion coatings. These tests are considered to be accelerated tests insofar as they produce corrosive conditions far more severe than those encountered by automotive bodies under normal road conditions. Aluminum corrosion products were well in evidence on the untreated assemblies, i.e., those without chromate conversion coatings, after 24 hours of testing. The treated assemblies, i.e., those with chromate conversion coatings, were essentially free of aluminum corrosion products after hours of testing and provided the carbon steel body member with galvanic protection equivalent to that provided by the untreated assemblies.
It will be apparent to those skilled in the art that the novel principles of the invention disclosed herein in connection with specific examples thereof will suggest various other modifications and applications of the same. It is accordingly desired that in construing the breadth of the appended claims they shall not be limited to the specific examples of the invention described herein.
Iclaim:
I. An assembly comprising a stainless steel trim member in combination with a first metal less noble in the electromotive series than stainless steel; said stainless steel trim member having an exposed surface and a contact surface abutting said first metal, a layer of aluminum adhering to said contact surface, said aluminum being less noble in the electromotive series than said first metal, and a conversion coating from the group consisting of chromate and phosphate conversion coatings on said aluminum. said coated aluminum acting to preclude galvanic action between said first metal and said stainless steel.
2. An assembly according to claim 1 wherein said first metal is plain carbon steel.
3. An assembly according to claim 1 wherein said conversion coating is a chromate conversion coating.
4. An assembly according to claim I wherein said conversion coating is a phosphate conversion coating.
9. A composite article according to claim 7 wherein said conversion coating is a phosphate conversion coating.
10. A composite article according to claim 7 having at least two spaced-apart stripes of aluminum.
II. A composite article according to claim 7 wherein said aluminum has a thickness in excess of about 0.5 of a mil.
12. A composite article according to claim I] wherein said aluminum has a thickness of from about 3 mils to about 5 mils.

Claims (11)

  1. 2. An assembly according to claim 1 wherein said first metal is plain carbon steel.
  2. 3. An assembly according to claim 1 wherein said conversion coating is a chromate conversion coating.
  3. 4. An assembly according to claim 1 wherein said conversion coating is a phosphate conversion coating.
  4. 5. An assembly according to claim 1 wherein said aluminum has a thickness in excess of about 0.5 of a mil.
  5. 6. An assembly according to claim 5 wherein said aluminum has a thickness of from about 3 mils to about 5 mils.
  6. 7. A composite article comprising: stainless steel, at least one stripe of aluminum adhered to said stainless steel and a conversion coating from the group consisting of chromate and phosphate conversion coatings on said aluminum.
  7. 8. A composite article according to claim 7 wherein said conversion coating is a chromate conversion coating.
  8. 9. A composite article according to claim 7 wherein said conversion coating is a phosphate conversion coating.
  9. 10. A composite article according to claim 7 having at least two spaced-apart stripes of aluminum.
  10. 11. A composite article according to claim 7 wherein said aluminum has a thickness in excess of about 0.5 of a mil.
  11. 12. A composite article according to claim 11 wherein said aluminum has a thickness of from about 3 mils to about 5 mils.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3859061A (en) * 1973-04-23 1975-01-07 Chromalloy American Corp Corrosion resistant coating system for ferrous metal articles having brazed joints
US3948689A (en) * 1969-06-30 1976-04-06 Alloy Surfaces Company, Inc. Chromic-phosphoric acid coated aluminized steel
US4885215A (en) * 1986-10-01 1989-12-05 Kawasaki Steel Corp. Zn-coated stainless steel welded pipe
US20170276160A1 (en) * 2014-04-15 2017-09-28 Changize Sadr Structural assembly and method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3201211A (en) * 1962-06-22 1965-08-17 Allegheny Ludlum Steel Stainless steel trim member
US3201210A (en) * 1963-01-03 1965-08-17 Allegheny Ludlum Steel Trim member assembly
US3201212A (en) * 1962-06-22 1965-08-17 Allegheny Ludlum Steel Trim member
US3484350A (en) * 1965-04-28 1969-12-16 Allegheny Ludlum Steel Method of producing trim members
US3536459A (en) * 1967-11-29 1970-10-27 United States Steel Corp Stainless steel composite

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3201211A (en) * 1962-06-22 1965-08-17 Allegheny Ludlum Steel Stainless steel trim member
US3201212A (en) * 1962-06-22 1965-08-17 Allegheny Ludlum Steel Trim member
US3201210A (en) * 1963-01-03 1965-08-17 Allegheny Ludlum Steel Trim member assembly
US3484350A (en) * 1965-04-28 1969-12-16 Allegheny Ludlum Steel Method of producing trim members
US3536459A (en) * 1967-11-29 1970-10-27 United States Steel Corp Stainless steel composite

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3948689A (en) * 1969-06-30 1976-04-06 Alloy Surfaces Company, Inc. Chromic-phosphoric acid coated aluminized steel
US3859061A (en) * 1973-04-23 1975-01-07 Chromalloy American Corp Corrosion resistant coating system for ferrous metal articles having brazed joints
US4885215A (en) * 1986-10-01 1989-12-05 Kawasaki Steel Corp. Zn-coated stainless steel welded pipe
US20170276160A1 (en) * 2014-04-15 2017-09-28 Changize Sadr Structural assembly and method

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