US3701677A - Method of after-treatment of metal platings - Google Patents

Method of after-treatment of metal platings Download PDF

Info

Publication number
US3701677A
US3701677A US85163A US3701677DA US3701677A US 3701677 A US3701677 A US 3701677A US 85163 A US85163 A US 85163A US 3701677D A US3701677D A US 3701677DA US 3701677 A US3701677 A US 3701677A
Authority
US
United States
Prior art keywords
cracks
nozzle
plated
aluminum
treatment
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
US85163A
Inventor
Akira Miyata
Hideyo Okubo
Chikayoshi Tomita
Akio Suzuki
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.)
NIPPON KOKAN TECHNICAL INST KK
Original Assignee
NIPPON KOKAN TECHNICAL INST KK
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 NIPPON KOKAN TECHNICAL INST KK filed Critical NIPPON KOKAN TECHNICAL INST KK
Application granted granted Critical
Publication of US3701677A publication Critical patent/US3701677A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
    • C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/11—Making amorphous alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • 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
    • C23F17/00—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
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/66—Electroplating: Baths therefor from melts
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/48—After-treatment of electroplated surfaces
    • 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
    • Y10S29/00—Metal working
    • Y10S29/012—Method or apparatus with electroplating
    • 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
    • Y10S29/00—Metal working
    • Y10S29/036—Shot blasting with other step

Definitions

  • This invention relates to an after-treatment of metal platings deposited on the surface of different metals.
  • An object of this invention is to provide plated plates or sheets of excellent adhesiveness and corrosion resistance by driving olf the bath composition remaining in the cracks by suitable means and then peening the plates by utilizing solid particles such as glass beads.
  • Still another approach is to eliminate particles adhering to the steel surface such as rust by applying peening treatment.
  • This method is applicable only to big size particles and therefore the pressure of the nozzle in peening treatment is bigger.
  • glass beads are jetted with a very small nozzle pressure in order to eliminate line cracks on the plated surface, utilizing the jet pressure and malleability of aluminum, thus improving corrosion resistance of plated surface.
  • FIG. 1 shows results of visual observations and observations made with an electron microscope of a steel plate described in Example l.
  • FIGS. 2a-c are photomicrographs of steel plates described in Example 1.
  • FIG. 3 shows corrosion results described in Example 2.
  • FIG. 4 shows relationships between the distance of a nozzle from an object which is treated and corrosion resistance, together with glass bead size.
  • the surface of aluminum plated steel after cooling is uneven and has fine cracks.
  • aluminum plated steel is dipped in a tank lilled with distilled water, rinsed by ultrasonic wave rinsing method and then dried.
  • Glass beads having a predetermined diameter are jetted by a nozzle with a predetermined pressure.
  • the distance between the plated surface and the nozzle is maintained constant.
  • the diameter of the glass beads is set at to 150g, jet pressure of the pressure of the nozzle, 0.5 to 1.5 kg./cm.2, and the distance between the plated surface and the nozzle is mm., which may be varied according to the object to be treated.
  • da molten bath was immediately placed in a vessel containing distilled water. Any material from the molten bath composition remaining in any cracks of the aluminum coating was then driven off thoroughly by applying an ultrasonic wave to the distilled water containing the aluminum-coated steel plate. The plate was then air dried.
  • a jet of fine glass beads having an average size of 80 microns was applied to the surface of the dried plate through a jet nozzle for 30 secondsl under a pressure of 0.5 kg./cm.2, the distance between the nozzle and the article being maintained at 100 mm. Soft aluminum was deformed to eliminate cracks thus improving the property of the aluminum plating.
  • the diameter of glass beads and nozzle pressure were then varied with the distance between the nozzle and the plated steel at 100 mm. and the time for jetting for 30 seconds.
  • Diameter of glass beads 80p, 150;.
  • Nozzle pressure (kg/cm2): 0.5, 0.075, 1.2, 1.25, 1.5, 1.75,
  • FIG. 1 Naked eye and electronic microscope observation of the plated surface after jetting was made, the result of which is shown in FIG. 1. Close examination of FIG. 1 shows the nozzle pressure of 0.5 to 1.5 -kg./cm.2 shows the best result. If the pressure is below 0.5 kg./cm.2, the surface treatment is not satisfactorily conducted and if it exceeds 1.5 kg./cm.2, the film may be damaged.
  • FIGS. 2a, 2b, and 2c Test piece treated in the process where the diameter of glass beads was set at g, nozzle pressure at 1.0 kg./cm.2 is shown in FIGS. 2a, 2b, and 2c, as before the treatment, during the treatment and after the treatment, respectively, in electromiscroscopic photos (1:5000). While FIG. 2a shows cracks on the surface distinctly, no cracks are seen in FIG. 2c.
  • Example 2 Corrosion test of the treated test piece was conducted in Example 2.
  • the salt water spray test (ASTM-B117- 49T) was used and test pieces were subjected to observation untilred rust appeared. The result thereof is shown in FIG. 3.
  • the corrosion resistance property of the surface film begins to improve from the point when the nozzle pressure is 0.5 kg./cm.2, reaching its maximum at 1.0 kg./cm.2, and becoming stationaryat 1.7 kg./cm.2.
  • the-corrosion resistance property of the film surface begins to improve as early as at the point of 0.3 kg./cm.2 nozzle pressure, reaching its maximum at 0.7 kg./cm.2, and becoming stationary at"1.5 kg./cm.2.
  • Example 3 Study was made of the relation between the distance from the nozzle to the object to be treated and the corrosion resistance property.
  • the glass beads of 80p. and 150g were used and the jet pressure was 1.0 kg./cm.2 for 30 seconds.
  • the distance between the nozzle and the deposited metal was varied as 20, ⁇ 40, 60, 80, 100, 120, 140, 160, 180, 200, 220 and 240 mm.
  • the same corrosion test as in Example 2 was applied.
  • FIG. 4 shows its results, according to which the corrosion resistance prop- 4 erty is at itsmaximum when the glass beads are 80p. in
  • the diameter and the distance between the nozzle and the deposited material is 40 mm. In excess of 40 mm. distance, the property gradually deteriorates. When the diameter is 150,1, the distance becomes maximum at 80 mm. From the foregoing, one learns the correlation among the diameter of glass beads, pressure of the nozzle, and the distance between the nozzle and the material. These three factors are to be varied in accordance with the variance of objects to be treated. The inventors have decided to adopt the glass beadshaving the diameter of 80 to 150; and the pressure of the nozzle of 0.5 to 1.5 kg./cm.2. The other factors are variable depending on the variance of objects to be treated.
  • the presen-t invention facilitates filling in the complex shapes of cavities on the plated surface by cleansing and drying of plated surface and by peening process and succeeds in obtaining beautiful plating surface. without cracks.
  • Such beautiful plated surface also has excellent corrosion resistance and adhesion properties.
  • the present invention has so far been described in respect of aluminum, but it is not limited only to aluminum.
  • plating process as cadmium plating over the steels where the difference in expansion coeicient is great, the same type of treatment is possible and beautiful plating surface having excellent corrosion resistance is obtained. Even in the cases where cracks are seen between iron surface and plating because of expansion and contraction, this invention method is applicable if the plating metal has malleability.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

METAL ARTICLES PLATED WITH METALS HAVING A TENDENCY OF FORMING CRACKS IN THE DEPOSITED METALS ARE SUBJECTED TO

A JET STREAM OF SOLID PARTICLES SUCH AS GLASS BEADS TO ELIMINATE THE CRACKS.

Description

oct' 31, 1972 AKIRA MIYATA EI'AL '3,701,677
METHOD 0F AFTER-'TREATMENT 0F METAL PLATINGS.
Filed oct. 29, 1970 4 sheets-sheet 2 FIG-.20 n Fleet /nven/ons. A/r//a M/ afa H/'o'eyoO un@ Cn/'lrayosn/ Tom/fa Alf/0 Suzuki By F /ynn 8 Fr/shauf Attorneys OCL 31, 1972 AK|RA M|YATA ETAL 3,701,677
METHOD OF AFTER-TREATMENT OF METAL PLATINGS Filed Oct. 29, 1970 4 Sheets-Sheet 3 FIGURE 3 l O Nozzle Pressure, KCS/CM2 Effem` of Peening L Jpon Corrosion Resistance l I s l l a I l l O O o o O 8 m smoH "45mg psg o4sauoqg www uauMewgl /m/en/ors Alf/'m M/'ya/o OC. 31, 1972 AKlRA MIYATA ETAL 3,701,677
METHOD OF AFTER-TREATMENT OF METAL PLATINGS Filed OC.. 29, 1970 4 Sheets-Sheet 4 AI EE @2535 OQ OQ O mokwmww :Qwotoo coa: QEom 2 QNNOZ Eo: 8:22@ 62E v MEDOE @om m U Oo@ ml. D
,Hw 00mm@ ww uw @om w mw /m/en/ors nited States Patent ce 3,701,677 Patented Oct. 31, 1972 Ser. No. 85,163
Int. Cl. 824e 1/00 U.S. Cl. 204-35 R 3 Claims ABSTRACT OF THE DISCLOSURE Metal articles plated with metals having a tendency of forming cracks in the deposited metals are subjected to a jet stream of solid particles such as glass beads to eliminate the cracks.
RELATED APPLICATIONS This application is a continuation-in-part of application Ser. No. 698,416, filed J an. 17, 1968 and now abandoned. It is also related to application Ser. No. 693,093, led Dec. 26, 1967, now Pat. No. 3,470,073, issued Sept. 30, 1969.
This invention relates to an after-treatment of metal platings deposited on the surface of different metals.
Where the surface of metals is plated with different metals =`by a chemical or electrical process, fine cracks are often formed on the surface of the platings due to the difference in elastic limit or coeicient of expansion of two metals.
An object of this invention is to provide plated plates or sheets of excellent adhesiveness and corrosion resistance by driving olf the bath composition remaining in the cracks by suitable means and then peening the plates by utilizing solid particles such as glass beads.
For example, when aluminum is plated upon a steel sheet by utilizing a molten bath maintained at a temperature of about 160/ C., as described in said related application now 3,470,073, line cracks are often formed around the periphery of aluminum crystal grains due to the difference in the expansion coecient of aluminum and steel, the expansion coefiicient being 22.5 X 10-6 for aluminum and 11.6 106 for steel. Even after removal of the plated sheet from the bath, the composition remains in said cracks to deteriorate the plating. Even when the plated article is thoroughly washed the remaining bath composition afects the corrosion proof property of aluminum. This invention contemplates a solution of this problem.
One prior approach for healing these cracks involves heating of the plated sheet to re-melt aluminum thus eliminating cracks. Alternatively, where the product is in the form of a plate, it is passed through a rolling mill to effect a slight reduction to close cracks by pressure. The former method, however, is not applicable Where the material deteriorates by the heat of heat treatment or where the deposited metal alloys with the substrate metal, whereas the latter method is not applicable to products of irregular or complicated configuration.
Still another approach is to eliminate particles adhering to the steel surface such as rust by applying peening treatment. This method, however, is applicable only to big size particles and therefore the pressure of the nozzle in peening treatment is bigger.
According to this invention, glass beads are jetted with a very small nozzle pressure in order to eliminate line cracks on the plated surface, utilizing the jet pressure and malleability of aluminum, thus improving corrosion resistance of plated surface.
FIG. 1 shows results of visual observations and observations made with an electron microscope of a steel plate described in Example l.
FIGS. 2a-c are photomicrographs of steel plates described in Example 1.
FIG. 3 shows corrosion results described in Example 2.
FIG. 4 shows relationships between the distance of a nozzle from an object which is treated and corrosion resistance, together with glass bead size.
The manner in which the present invention accomplishes the above described objects can be more fully apprehended from a consideration of the following descriptions and of the preferred examples.
The surface of aluminum plated steel after cooling is uneven and has fine cracks. In order to eliminate residual compounds from the electrolytic bath in the said cracks, aluminum plated steel is dipped in a tank lilled with distilled water, rinsed by ultrasonic wave rinsing method and then dried. Glass beads having a predetermined diameter are jetted by a nozzle with a predetermined pressure. The distance between the plated surface and the nozzle is maintained constant. In the present invention, the diameter of the glass beads is set at to 150g, jet pressure of the pressure of the nozzle, 0.5 to 1.5 kg./cm.2, and the distance between the plated surface and the nozzle is mm., which may be varied according to the object to be treated.
da molten bath was immediately placed in a vessel containing distilled water. Any material from the molten bath composition remaining in any cracks of the aluminum coating was then driven off thoroughly by applying an ultrasonic wave to the distilled water containing the aluminum-coated steel plate. The plate was then air dried.
A jet of fine glass beads having an average size of 80 microns was applied to the surface of the dried plate through a jet nozzle for 30 secondsl under a pressure of 0.5 kg./cm.2, the distance between the nozzle and the article being maintained at 100 mm. Soft aluminum was deformed to eliminate cracks thus improving the property of the aluminum plating.
The diameter of glass beads and nozzle pressure were then varied with the distance between the nozzle and the plated steel at 100 mm. and the time for jetting for 30 seconds.
Diameter of glass beads: 80p, 150;. Nozzle pressure (kg/cm2): 0.5, 0.075, 1.2, 1.25, 1.5, 1.75,
Naked eye and electronic microscope observation of the plated surface after jetting was made, the result of which is shown in FIG. 1. Close examination of FIG. 1 shows the nozzle pressure of 0.5 to 1.5 -kg./cm.2 shows the best result. If the pressure is below 0.5 kg./cm.2, the surface treatment is not satisfactorily conducted and if it exceeds 1.5 kg./cm.2, the film may be damaged.
Test piece treated in the process where the diameter of glass beads was set at g, nozzle pressure at 1.0 kg./cm.2 is shown in FIGS. 2a, 2b, and 2c, as before the treatment, during the treatment and after the treatment, respectively, in electromiscroscopic photos (1:5000). While FIG. 2a shows cracks on the surface distinctly, no cracks are seen in FIG. 2c.
Example 2 Corrosion test of the treated test piece was conducted in Example 2. The salt water spray test (ASTM-B117- 49T) was used and test pieces were subjected to observation untilred rust appeared. The result thereof is shown in FIG. 3. When the diameter of glass beads is 80a, the corrosion resistance property of the surface film begins to improve from the point when the nozzle pressure is 0.5 kg./cm.2, reaching its maximum at 1.0 kg./cm.2, and becoming stationaryat 1.7 kg./cm.2. When the diameter of glass beads is 150,11., the-corrosion resistance property of the film surface begins to improve as early as at the point of 0.3 kg./cm.2 nozzle pressure, reaching its maximum at 0.7 kg./cm.2, and becoming stationary at"1.5 kg./cm.2.
From ythe foregoing, it is known that there is a correlation among the necessary factors for peening treatment; more in particular the smaller pressure obtains better results in the case of 15 0p. diameter glass beads.
lExample 3 Study was made of the relation between the distance from the nozzle to the object to be treated and the corrosion resistance property. The glass beads of 80p. and 150g were used and the jet pressure was 1.0 kg./cm.2 for 30 seconds. The distance between the nozzle and the deposited metal was varied as 20, `40, 60, 80, 100, 120, 140, 160, 180, 200, 220 and 240 mm. The same corrosion test as in Example 2 was applied. FIG. 4 shows its results, according to which the corrosion resistance prop- 4 erty is at itsmaximum when the glass beads are 80p. in
diameter and the distance between the nozzle and the deposited material is 40 mm. In excess of 40 mm. distance, the property gradually deteriorates. When the diameter is 150,1, the distance becomes maximum at 80 mm. From the foregoing, one learns the correlation among the diameter of glass beads, pressure of the nozzle, and the distance between the nozzle and the material. These three factors are to be varied in accordance with the variance of objects to be treated. The inventors have decided to adopt the glass beadshaving the diameter of 80 to 150; and the pressure of the nozzle of 0.5 to 1.5 kg./cm.2. The other factors are variable depending on the variance of objects to be treated.
As is clear from the Iforegoing, the presen-t invention facilitates filling in the complex shapes of cavities on the plated surface by cleansing and drying of plated surface and by peening process and succeeds in obtaining beautiful plating surface. without cracks. Such beautiful plated surface also has excellent corrosion resistance and adhesion properties.
The present invention has so far been described in respect of aluminum, but it is not limited only to aluminum. In such plating process as cadmium plating over the steels where the difference in expansion coeicient is great, the same type of treatment is possible and beautiful plating surface having excellent corrosion resistance is obtained. Even in the cases where cracks are seen between iron surface and plating because of expansion and contraction, this invention method is applicable if the plating metal has malleability.
We claim:
1. AIn the method of after-treatment of a plated metal which has a tendency of forming cracks in a metal deposit due to the difference in the expansion coeiiicient or in theelastic limit of the deposited metal and a base metal, the improvement which comprises: immersing in water an aluminum-plated steel formed by electrolytically plating the steel in a molten bath, subjecting the immersed aluminum-platedsteel to anultrasonic wave to thereby remove substantially all material left by the bath in the cracks of the aluminum plating, and then applying to the surface of the aluminum-plated steel a jet stream of glass beads in the size range of from about to about 150 microns under a pressure of from about 0.5 to about 1.5 kg./lcrn.2 to deform the aluminum plating and eliminate cracks therein.
2. The method of claim 1 wherein the plated metal is dried prior to application of the jet stream.
3. The method of claim 1 wherein the jet stream is applied to said plated aluminum or cadmium at a distance of from about 20 to about 200 mm.
References Cited UNITED STATES PATENTS 3,138,845 `6/1964- Hellman et al. 29-90 3,066,042 11/ 1962 Ogden 117-65\.2 3,410,124 11/1968 Suwa 72-53 3,367,798 2/1968 Bremer et al 134-1 3,019,522 2/1962 Bluth et al. 29-552 108,408 10/ 1870 Tilghman 72-53 2,769,709 11/ 1956 Talmage 7 5-221 WILLIAM D. MARTIN, Primary Examiner r M. R. LUSIGNAN, Assistant Examiner U.S. Cl. X.R.
72-53; 117-63, 65.2, 114 C, Dig. l8; 34-1; 2104-39 i
US85163A 1970-10-29 1970-10-29 Method of after-treatment of metal platings Expired - Lifetime US3701677A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US8516370A 1970-10-29 1970-10-29

Publications (1)

Publication Number Publication Date
US3701677A true US3701677A (en) 1972-10-31

Family

ID=22189857

Family Applications (1)

Application Number Title Priority Date Filing Date
US85163A Expired - Lifetime US3701677A (en) 1970-10-29 1970-10-29 Method of after-treatment of metal platings

Country Status (1)

Country Link
US (1) US3701677A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4034585A (en) * 1975-08-25 1977-07-12 Straub John C Process of compression stressing metals to increase the fatigue strength thereof
US4330375A (en) * 1979-10-02 1982-05-18 Vereinigte Metallwerke Ranshofen-Berndorf Aktiengesellschaft Method of cleaning cathodes
US5355570A (en) * 1990-09-20 1994-10-18 Sms Schloemann-Siemag Aktiengesellschaft Method for the production of bright round steel
US6808751B2 (en) 2001-10-03 2004-10-26 Industrial Hard Chrome Method for improving corrosion resistance of chrome plated material
US20050123683A1 (en) * 2001-10-03 2005-06-09 C.G. Thirkeldsen Method and apparatus for improving corrosion resistance of chrome plated material

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4034585A (en) * 1975-08-25 1977-07-12 Straub John C Process of compression stressing metals to increase the fatigue strength thereof
US4330375A (en) * 1979-10-02 1982-05-18 Vereinigte Metallwerke Ranshofen-Berndorf Aktiengesellschaft Method of cleaning cathodes
US5355570A (en) * 1990-09-20 1994-10-18 Sms Schloemann-Siemag Aktiengesellschaft Method for the production of bright round steel
US6808751B2 (en) 2001-10-03 2004-10-26 Industrial Hard Chrome Method for improving corrosion resistance of chrome plated material
US20050022728A1 (en) * 2001-10-03 2005-02-03 C. G. Therkildsen Apparatus for improving corrosion resistance of chrome plated material
US20050123683A1 (en) * 2001-10-03 2005-06-09 C.G. Thirkeldsen Method and apparatus for improving corrosion resistance of chrome plated material
US7037373B2 (en) 2001-10-03 2006-05-02 Industrial Hard Chrome, Ltd. Apparatus for improving corrosion resistance of chrome plated material
US7641782B2 (en) 2001-10-03 2010-01-05 Industrial Hard Chrome, Ltd. Method and apparatus for improving corrosion resistance of chrome plated material
US20100101488A1 (en) * 2001-10-03 2010-04-29 Therkildsen Charles G Method and Apparatus for Improving Corrosion Resistance of Chrome Plated Material
US8303783B2 (en) 2001-10-03 2012-11-06 Industrial Hard Chrome, Ltd. Method and apparatus for improving corrosion resistance of chrome plated material

Similar Documents

Publication Publication Date Title
US2915444A (en) Process for cleaning and plating ferrous metals
JPS5932553B2 (en) How to form a strippable copper coating on aluminum
US3699013A (en) Method of electroplating readily oxidizable metals
US3701677A (en) Method of after-treatment of metal platings
US2244526A (en) Process of treating metal surfaces
US1256954A (en) Process of metal-plating aluminium.
US2548420A (en) Method of producing lustrous zinc
US3762883A (en) Coated steel article
US2271375A (en) Process of coating metal surfaces
US3201211A (en) Stainless steel trim member
JPS5770268A (en) Preparation of galvanized sheet iron
US2228836A (en) Rust-proofing process
US3880727A (en) Method of pretreating bands and sheets of steel for one-layer enameling, and electrolytic bath for use in connection therewith
US1523741A (en) Method of rust removal and prevention
US3617345A (en) Method of manufacturing aluminum coated ferrous base articles
US2856333A (en) Electroplating
JPS605896A (en) Treatment of aluminum and its alloy as substrate
US2839437A (en) Method of producing a dull finished fused tin coating
US3547787A (en) Hot dip tinning a high carbon ferrous metal
JPS6029477A (en) Production of steel sheet for can vessel having excellent weldability and painting performance
US2277664A (en) Zinc plating ferrous articles
US827802A (en) Process of treating iron or steel objects.
US1878837A (en) Method of preparing metals for electroplating
US1069857A (en) Planographic printing-surface.
US2213952A (en) Process for treating metal surfaces