US1967715A - Surface treatment for zinc base alloys - Google Patents

Surface treatment for zinc base alloys Download PDF

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Publication number
US1967715A
US1967715A US674035A US67403533A US1967715A US 1967715 A US1967715 A US 1967715A US 674035 A US674035 A US 674035A US 67403533 A US67403533 A US 67403533A US 1967715 A US1967715 A US 1967715A
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US
United States
Prior art keywords
base alloys
zinc base
surface treatment
zinc
alloys
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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
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US674035A
Inventor
Jr Wlllett C Magruder
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.)
Carter Carburetor Corp
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Carter Carburetor Corp
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Publication date
Application filed by Carter Carburetor Corp filed Critical Carter Carburetor Corp
Priority to US674035A priority Critical patent/US1967715A/en
Priority to DEC48915D priority patent/DE635261C/en
Application granted granted Critical
Publication of US1967715A publication Critical patent/US1967715A/en
Anticipated expiration legal-status Critical
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
    • C23C22/05—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
    • C23C22/24—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 hexavalent chromium compounds

Definitions

  • This invention relates to means and methods of forming corrosion resisting coatings for zinc base alloys and particularly to such alloys as are ordinarily used for die casting purposes.
  • This invention is applicable generally to zinc base alloys some of which are listed below for purposes of illustration:
  • Castings of zinc base alloys when treated by the method above described have strong corrosion resisting qualities and also a neat appearance and there is no chance of clogging up any small passageways which may be formed in the casting.
  • the method of coating zinc base metals which comprises immersing them in a solution v containing zinc chloride, ammonium chloride, ammonium thiocyanate, and an oxygen contain- 1 ing chromium salt of an akali metal.
  • the method of coating zinc base alloys which comprises immersing them in a solution containing nickel chloride, zinc chloride, ammonium chloride, ammonium thiocyanate, and a salt from the group consisting of alkali metal chromates and dichromates.
  • the method of providing zinc base alloys. with a corrosion resisting coating which comprises immersing them in a solution containing zinc chloride, ammonium chloride; ammonium thiocyanate and a salt from the group consisting of alkali metal chromates and dichromates.

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  • 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)

Description

' Patented July 24, 1934 UNITED STATES PATENT OFFICE SURFACE TREATMENT FOR ZINC BASE ALLOYS No Drawing. Application June 2, 1933, Serial No. 674,035
3 Claims. (Cl- 148-8) This invention relates to means and methods of forming corrosion resisting coatings for zinc base alloys and particularly to such alloys as are ordinarily used for die casting purposes.
5 Attempts have previously been made to coat such alloys with black nickel, phosphates and copper, but these methods. were not entirely satisfactory because they did not completely protect the surface nor did they sufilcientl'y resist the corresion. In addition to this certain of these treatments produce an unsightly coloring on the surface of the zinc which was, of course, objectionable.
It is an object of this invention to produce a is corrosion resisting coating for zinc base alloys which will be of sufficient density to protect the alloy from the action of moist atmosphere, salt spray and the like.
It is a further object of this invention to produce a corrosion resisting coating for zinc base alloys which will be. sufliciently dense to protect the material from corrosion and yet not so thick as to substantially change the dimensions of the casting or to fill up any small cast passageways which may have been formed therein. I
It is a further object of this invention to produce a corrosion resisting coating for zinc base alloys of such a nature that the coated casting will have substantially the same appearance as the original uncoated casting; or in other words to produce a substantially invisible or nonnoticeable corrosion resisting coating for such alloys.
This invention is applicable generally to zinc base alloys some of which are listed below for purposes of illustration:
may be made as follows:
4 oz .Nickel chloride 6 oz. .Zinc chloride y, oz Ammnnium chloride 5 2 oz Ammnninm tmocymte oz "Potassium dlchromate 1 gal.. .Water The above solution is heated to the boiling point or slightly below and the castings to be treated are immersed in the bath for a period of approximately five minutes, and then removed and dried. It will be understood, or course, that all grease, oil and dirt must be removed from the castings prior to the treatment. The cleaning may be done by any of the well known methods for cleaning such material such as immersion in a sodium hydroxide bath or washing with carbon tetrachloride, oakite, or xylene.
Castings of zinc base alloys when treated by the method above described have strong corrosion resisting qualities and also a neat appearance and there is no chance of clogging up any small passageways which may be formed in the casting.
The exact chemical reactions that take place in this solution are not fully understood at this time except that chromium in some form is deposited on the surface of the casting in a thin 'but strongly adhesive layer. It is quite possible that there is also some deposition of nickel. However, it is fully established that zinc base alloys may be given a very satisfactory protective coating by the practice of the above described method.
Iclaim:
1. The method of coating zinc base metals which comprises immersing them in a solution v containing zinc chloride, ammonium chloride, ammonium thiocyanate, and an oxygen contain- 1 ing chromium salt of an akali metal.
2. The method of coating zinc base alloys which comprises immersing them in a solution containing nickel chloride, zinc chloride, ammonium chloride, ammonium thiocyanate, and a salt from the group consisting of alkali metal chromates and dichromates.
3. The method of providing zinc base alloys. with a corrosion resisting coating which comprises immersing them in a solution containing zinc chloride, ammonium chloride; ammonium thiocyanate and a salt from the group consisting of alkali metal chromates and dichromates.
WILLETT C. MAGRUDER, Jr.
US674035A 1933-06-02 1933-06-02 Surface treatment for zinc base alloys Expired - Lifetime US1967715A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US674035A US1967715A (en) 1933-06-02 1933-06-02 Surface treatment for zinc base alloys
DEC48915D DE635261C (en) 1933-06-02 1934-02-28 Process for the production of a corrosion-resistant coating on objects made of zinc alloys

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US674035A US1967715A (en) 1933-06-02 1933-06-02 Surface treatment for zinc base alloys

Publications (1)

Publication Number Publication Date
US1967715A true US1967715A (en) 1934-07-24

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Family Applications (1)

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DE (1) DE635261C (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2434237A (en) * 1943-09-13 1948-01-06 Sk Wellman Co Apparatus for applying powdered metal briquets to curved metallic surfaces
US2434525A (en) * 1943-08-23 1948-01-13 Rheem Mfg Co Coating on metals
US4776898A (en) * 1985-03-20 1988-10-11 Omi International Corporation Passivation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2434525A (en) * 1943-08-23 1948-01-13 Rheem Mfg Co Coating on metals
US2434237A (en) * 1943-09-13 1948-01-06 Sk Wellman Co Apparatus for applying powdered metal briquets to curved metallic surfaces
US4776898A (en) * 1985-03-20 1988-10-11 Omi International Corporation Passivation

Also Published As

Publication number Publication date
DE635261C (en) 1936-09-14

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