US3849206A - Densification of hard chrome plated surfaces - Google Patents

Densification of hard chrome plated surfaces Download PDF

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Publication number
US3849206A
US3849206A US00320217A US32021773A US3849206A US 3849206 A US3849206 A US 3849206A US 00320217 A US00320217 A US 00320217A US 32021773 A US32021773 A US 32021773A US 3849206 A US3849206 A US 3849206A
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US
United States
Prior art keywords
chromic acid
heating
solution
chrome plated
temperature
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
US00320217A
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English (en)
Inventor
L Jacobs
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.)
Premier Refractories and Chemicals Inc
Original Assignee
Combustion Engineering Inc
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 Combustion Engineering Inc filed Critical Combustion Engineering Inc
Priority to US00320217A priority Critical patent/US3849206A/en
Priority to CA187,004A priority patent/CA993285A/en
Priority to DE2364329A priority patent/DE2364329A1/de
Priority to JP48144796A priority patent/JPS4998342A/ja
Publication of US3849206A publication Critical patent/US3849206A/en
Application granted granted Critical
Assigned to VFR, INC., 901 EAST 8TH AVENUE, KING OF PRUSSIA, PA. 19406, A DE. CORP. reassignment VFR, INC., 901 EAST 8TH AVENUE, KING OF PRUSSIA, PA. 19406, A DE. CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: COMBUSTION ENGINEERING, INC.
Assigned to PREMIER REFRACTORIES AND CHEMICALS INC., reassignment PREMIER REFRACTORIES AND CHEMICALS INC., ASSIGNMENT OF ASSIGNORS INTEREST. EFFECTIVE 10-28-88 Assignors: VFR, INC.,
Assigned to CONTINENTAL BANK N.A., A NATIONAL BANKING ASSOCIATION reassignment CONTINENTAL BANK N.A., A NATIONAL BANKING ASSOCIATION SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PREMIER REFRACTORIES AND CHEMICALS INC.
Anticipated expiration legal-status Critical
Assigned to PREMIER REFRACTORIES AND CHEMICALS INC., A DE CORP. reassignment PREMIER REFRACTORIES AND CHEMICALS INC., A DE CORP. RELEASE BY SECURED PARTY OF A SECURITY AGREEMENT RECORDED AT REEL 5125 FRAME 0289 Assignors: CONTINENTAL BANK N.A.
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • C23C22/73—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 characterised by the process
    • C23C22/74—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 characterised by the process for obtaining burned-in conversion coatings

Definitions

  • chromium is very resistant to the corrosive action of many chemicals, such as corrosive acids and alkalies, these chemicals penetrate the pores and cracks and corrode the metal substrate. This action results in the flaking or pealing of the chromium plating from the substrate and parts which are subject to very high pressures, such as hydraulic components, may leak after a short service period.
  • the object of the present invention is to treat chrome plated surfaces to densify the surface by filling in inherent defects such as micropores and cracks. This densitication will prevent penetration of the chrome plating by chemicals and thereby reduce the tendency of the chrome plating to become detached from the substrate and reduce chemical attack on the substrate.
  • the objects of the present invention are accomplished by treating the chrome plated surfaces with a chromic acid solution and then converting the chromic acid to chromic oxide.
  • the chromic acid solution for use in the present invention isprepared by dissolving chromium trioxide in water to produce a chromic acid solution having a specific gravity of 1.64-1.66 at 70F. The preferred specific gravity is 1.65.
  • the chrome plated metal part to be treated is then immersed into the chromic acid solution or otherwise treated with the solution and the chromic acid wets and penetrates the micropores and cracks of the chrome plated surface.
  • the treated metal part is then heated so as to convert the chromic acid to a refractory chromic oxide.
  • the conversion of the chromic acid to chromic oxide takes place at a temperature between 700F and 1,200F.
  • This heating cycle involves first heating the treated metal part to 230F t F and held at this temperature for a period of time sufficient to insure that all the moisture is removed from the micropores and cracks of the chrome plated surface. The part is then gradually brought to a temperature of 700F i 50F. The rate of heating to this temperature level is determined by the mass and complexity of the metal part and is selected to avoid thermal stresses. Sufficient time is allowed to stabilize the temperature throughout the metal substrate. After the temperature has stabilized at 700F i 50F, the temperature of the surface is rapidly brought to 1200F 5 0F and then the part is removed from the heating equipment. This rapid heating from 700 to 1,200F converts the chromic acid to chromic oxide and the chromic oxide becomes very dense and is more strongly bonded to the base metal.
  • the repeated coating with chromic acid and curing to form chromic oxide will tend to more completely fill the pores and cracks of the chrome electroplated surface.
  • the part is then cooled to F and again treated with chromic acid solution, heated to 230F, gradually brought to the stabilized temperature of 700F and then rapidly heated to 1,200F. This procedure is repeated until the pores and cracks have been filled.
  • the part may then be finished by polishing by conventional means.
  • Heating of the metal parts may be accomplished by any conventional means such as in ovens or furnaces, or by means of radiant heat burners or by direct flame.
  • parts which have been heated with induction heating have proved to be the most effective in bonding the chromic oxide to the substrate. This fact is apparent on a microscopic examination of sections of parts treated in accordance with the present invention.
  • a method of treating metal parts having chrome plating thereon wherein said chrome plating contains pores and cracks comprising the steps of:
  • step of heating comprises the step of heating by induction heating.
  • said chromic acid solution contains a material selected from the group consisting of carbon black and lamp black, said material being present in an amount equivalent to 0.05 to 0.5 percent by weight of the chromic acid present in the chromic acid solution.

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Electroplating Methods And Accessories (AREA)
US00320217A 1973-01-02 1973-01-02 Densification of hard chrome plated surfaces Expired - Lifetime US3849206A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US00320217A US3849206A (en) 1973-01-02 1973-01-02 Densification of hard chrome plated surfaces
CA187,004A CA993285A (en) 1973-01-02 1973-11-29 Densification of hard chrome plated surfaces
DE2364329A DE2364329A1 (de) 1973-01-02 1973-12-22 Verfahren zur behandlung verchromter metallteile
JP48144796A JPS4998342A (ja) 1973-01-02 1973-12-28

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00320217A US3849206A (en) 1973-01-02 1973-01-02 Densification of hard chrome plated surfaces

Publications (1)

Publication Number Publication Date
US3849206A true US3849206A (en) 1974-11-19

Family

ID=23245400

Family Applications (1)

Application Number Title Priority Date Filing Date
US00320217A Expired - Lifetime US3849206A (en) 1973-01-02 1973-01-02 Densification of hard chrome plated surfaces

Country Status (4)

Country Link
US (1) US3849206A (ja)
JP (1) JPS4998342A (ja)
CA (1) CA993285A (ja)
DE (1) DE2364329A1 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4576655A (en) * 1983-06-23 1986-03-18 Ssab Svenskt Stal Ab Method for producing high strength steel with good ductility
US10519322B2 (en) * 2014-01-03 2019-12-31 The Boeing Company Composition and method for inhibiting corrosion

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3145236C2 (de) * 1981-11-13 1984-11-22 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8000 München Verfahren zur Herstellung von verformungsbeständigen oxydischen Schutzschichten
JPH05240156A (ja) * 1992-08-21 1993-09-17 Toshiba Corp 往復動型ピストンポンプ

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2327885A (en) * 1939-05-13 1943-08-24 Remington Arms Co Inc Ammunition manufacture
US2438013A (en) * 1940-07-22 1948-03-16 Patents Corp Treated steel sheet and process
US2618578A (en) * 1950-10-13 1952-11-18 Armco Steel Corp Blackening stainless steel
US2746915A (en) * 1951-10-15 1956-05-22 Autoyre Co Inc Electrolytic metal treatment and article
US2755242A (en) * 1954-04-09 1956-07-17 Aluminum Co Of America Treatment for chromium plated aluminum
US2773623A (en) * 1954-06-01 1956-12-11 Heintz Mfg Co Corrosion resistant coated steel members and method of making
US3526486A (en) * 1967-02-21 1970-09-01 Nat Steel Corp Corrosion resistant ferrous metal articles and method of preparing the same
US3755091A (en) * 1969-06-19 1973-08-28 Nat Steel Corp Process for reducing discoloration of electrochemically treated chromium plated ferrous metal strip

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2327885A (en) * 1939-05-13 1943-08-24 Remington Arms Co Inc Ammunition manufacture
US2438013A (en) * 1940-07-22 1948-03-16 Patents Corp Treated steel sheet and process
US2618578A (en) * 1950-10-13 1952-11-18 Armco Steel Corp Blackening stainless steel
US2746915A (en) * 1951-10-15 1956-05-22 Autoyre Co Inc Electrolytic metal treatment and article
US2755242A (en) * 1954-04-09 1956-07-17 Aluminum Co Of America Treatment for chromium plated aluminum
US2773623A (en) * 1954-06-01 1956-12-11 Heintz Mfg Co Corrosion resistant coated steel members and method of making
US3526486A (en) * 1967-02-21 1970-09-01 Nat Steel Corp Corrosion resistant ferrous metal articles and method of preparing the same
US3755091A (en) * 1969-06-19 1973-08-28 Nat Steel Corp Process for reducing discoloration of electrochemically treated chromium plated ferrous metal strip

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4576655A (en) * 1983-06-23 1986-03-18 Ssab Svenskt Stal Ab Method for producing high strength steel with good ductility
US10519322B2 (en) * 2014-01-03 2019-12-31 The Boeing Company Composition and method for inhibiting corrosion

Also Published As

Publication number Publication date
DE2364329A1 (de) 1974-07-11
CA993285A (en) 1976-07-20
JPS4998342A (ja) 1974-09-18

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Legal Events

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AS Assignment

Owner name: VFR, INC., 901 EAST 8TH AVENUE, KING OF PRUSSIA, P

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:COMBUSTION ENGINEERING, INC.;REEL/FRAME:004993/0109

Effective date: 19880927

AS Assignment

Owner name: PREMIER REFRACTORIES AND CHEMICALS INC.,

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. EFFECTIVE 10-28-88;ASSIGNOR:VFR, INC.,;REEL/FRAME:005020/0764

Effective date: 19890118

AS Assignment

Owner name: CONTINENTAL BANK N.A., A NATIONAL BANKING ASSOCIAT

Free format text: SECURITY INTEREST;ASSIGNOR:PREMIER REFRACTORIES AND CHEMICALS INC.;REEL/FRAME:005125/0289

Effective date: 19890621

AS Assignment

Owner name: PREMIER REFRACTORIES AND CHEMICALS INC., A DE CORP

Free format text: RELEASE BY SECURED PARTY OF A SECURITY AGREEMENT RECORDED AT REEL 5125 FRAME 0289;ASSIGNOR:CONTINENTAL BANK N.A.;REEL/FRAME:006098/0524

Effective date: 19911211