EP1407060B1 - Panier d'essorage chrome dur - Google Patents

Panier d'essorage chrome dur Download PDF

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Publication number
EP1407060B1
EP1407060B1 EP02732304A EP02732304A EP1407060B1 EP 1407060 B1 EP1407060 B1 EP 1407060B1 EP 02732304 A EP02732304 A EP 02732304A EP 02732304 A EP02732304 A EP 02732304A EP 1407060 B1 EP1407060 B1 EP 1407060B1
Authority
EP
European Patent Office
Prior art keywords
layer
hard
hard chrome
indicator
element according
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
EP02732304A
Other languages
German (de)
English (en)
Other versions
EP1407060A1 (fr
Inventor
Walter Gisin
Michael Hekli
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.)
Hartchrom AG
Original Assignee
Hartchrom AG
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 Hartchrom AG filed Critical Hartchrom AG
Publication of EP1407060A1 publication Critical patent/EP1407060A1/fr
Application granted granted Critical
Publication of EP1407060B1 publication Critical patent/EP1407060B1/fr
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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/40—Coatings including alternating layers following a pattern, a periodic or defined repetition
    • C23C28/44—Coatings including alternating layers following a pattern, a periodic or defined repetition characterized by a measurable physical property of the alternating layer or system, e.g. thickness, density, hardness
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/023—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/027—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal matrix material comprising a mixture of at least two metals or metal phases or metal matrix composites, e.g. metal matrix with embedded inorganic hard particles, CERMET, MMC.
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/16—Cylinders and plates for screens

Definitions

  • the invention relates to a hard chrome-plated element, in particular a screen basket, according to the preamble of claim 1.
  • elements for example those made of steel, are electroplated, in particular technically hard chrome-plated. It is possible to renew the hard chrome plating, that is to re-coat the element when a part of the hard chrome plating is removed.
  • stainless steel screen baskets are used whose surfaces are provided with a hard chrome layer to increase the wear resistance. These screen baskets can also be recoated.
  • the screen baskets consist of a plurality of rods having a substantially triangular cross section and thus have a plurality of crests. The abrasion is on these crests on. strongest, so that here the chrome layer is removed first.
  • the commonly used magnetic measuring methods for determining the layer thickness at these crests fail, it is relatively difficult to set the optimum time for recoating. Too early recoating increases the costs and leads to unnecessary production interruptions. If the screen basket is used too long, the base material on the dome is also removed and thus the screen basket is irreparably damaged. In the second case, the damage is serious because these baskets are relatively expensive. A new hard chrome plating would only amount to one twentieth of the production costs.
  • DE-A-199'09'871 also shows a Verschleissan Attache for a hard chrome-plated element of the type mentioned.
  • This display layer consists of copper, nickel, chromium or precious metals.
  • an indicator layer is present, which differs optically, in particular color, from the hard chrome layer. This makes it possible to detect even in geometrically complicated or hard to reach places, in particular on crests, whether the hard chrome layer has been removed.
  • a second hard chrome layer is provided between the indicator layer and the base material.
  • This second hard chromium layer serves as a run-flat layer with increased wear resistance to protect the base material from abrasion until re-chrome plating.
  • a voltage buffer layer is present between the second hard chrome layer and the indicator layer, which compensates for tensile stresses and thus prevents the indicator layer from cracking or flaking off.
  • FIG. 1 shows a simple embodiment of a layer structure of a screen basket according to the prior art.
  • the screen basket has a base body 1 made of a base material, preferably made of stainless steel.
  • an indicator layer 2 is applied on this base body 1.
  • the material of the indicator layer 2 differs optically, in particular color, from the base material 1.
  • copper is preferably used because of its low cost.
  • other materials are also suitable, for example non-ferrous metals such as brass or bronze, gold, metal ceramics, metal oxides, conductive plastics, black chrome or black nickel.
  • the indicator layers may be formed of metal dispersions or electrochemical dispersion layers such as nickel or copper with micro-color capsules as a dispersant, or they may consist of CVD, PVD or thermal spray coatings.
  • a hard chrome layer 3 is applied, wherein the indicator layer 2 is chosen so that it differs visually, in particular color, from the hard chromium layer 3 in any case. If the hard chrome layer 3 is removed, then the indicator layer 2 stands out optically at these points and indicates that the screen basket has to be chrome-plated anew. If the indicator layer 2 consists of a CVD or a PVD layer, then the screen basket does not have to be replaced immediately since these layers have a relatively good wear resistance and thus ensure a short-term wear protection in the form of a so-called run flat layer. This makes it possible to plan a renovation of the screen basket at rest.
  • FIG. 2 a structure, as in FIG. 2 is illustrated by a first preferred embodiment of this invention.
  • this structure allows a more cost-effective variant than the use of relatively expensive CVD and PVD layers.
  • the layers according to FIG. 1 are again provided with the same reference numerals.
  • a second hard chrome layer 4 is now present, which forms the emergency running layer.
  • This hard chrome layer 4 preferably has the same composition as the first hard chrome layer 3, but is much thinner. Typical values for a screen basket are 30-450 ⁇ m for the first hard chrome layer 3 and 25-30 ⁇ m for the second hard chrome layer 4.
  • adhesion promoters and activation methods can be used.
  • an adhesion-promoting layer 5 available between the second hard chrome layer 4 and the indicator layer 2, depending on the material of the indicator layer 2 an adhesion-promoting layer 5 available. This is necessary in particular when using plastic as an indicator layer 2.
  • the choice of material of the adhesion-promoting layer 5 depends on the type of indicator layer 2. For example, a nickel strike can be used as a primer.
  • FIG. 3 is a second, also preferred embodiment of the invention shown, which is especially recommended when using copper as the indicator layer 2.
  • a stress buffer layer 6 which absorbs shear forces.
  • the adhesion-promoting layer 5 again consists of a nickel strike and the voltage buffer layer 6 of galvanic nickel.
  • the adhesion-promoting layer 5 has a typical thickness of 20-60 .mu.m and the stress buffer layer 6 has a thickness greater than 20 .mu.m.
  • the main body 1 is hard chromium plated according to a known first method step using an inner anode. Then it is rinsed and dismantled the inner anode. Next, an anode basket for nickel is mounted and the hard chrome layer is activated in a hydrochloric acid solution. In an optional step is rinsed. Subsequently, first the nickel strike and then the galvanic nickel layer is applied. The anode basket for nickel is dismantled and an anode basket for copper is mounted.
  • the screen basket is copper-plated and the anode basket for copper is dismantled again to allow the installation of a leaded steel anode, a lead anode or platinum-plated titanium anode for hard chromium plating. It is covered with an increased current density to the influence of the copper layer to compensate for the electrical behavior.
  • the indicator layer can be applied by means of thermal spraying or tamponing.
  • the sieve basket according to the invention enables early detection of abrasions. Since there is also an emergency running layer, a renovation of the screen basket can be prepared in peace.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Composite Materials (AREA)
  • Inorganic Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Combined Means For Separation Of Solids (AREA)

Claims (9)

  1. Elément, en particulier panier de tamisage, doté d'un chromage dur et constitué d'un corps de base (1) en un matériau de base,
    la surface du corps de base (1) étant dotée d'une première couche de chromage dur (3),
    une couche d'indicateur (2) qui se distingue visuellement de la première couche de chromage dur (3) étant disposée entre la première couche de chromage dur (3) et le corps de base (1),
    caractérisé en ce que
    une deuxième couche de chromage dur (4) servant de couche de secours est prévue entre la couche d'indicateur (2) et le corps de base (1).
  2. Elément selon la revendication 1, caractérisé en ce que la couche d'indicateur (2) est constituée d'un métal non ferreux, d'une matière synthétique, de noir de chrome ou de noir de nickel.
  3. Elément selon la revendication 2, caractérisé en ce que la couche d'indicateur (2) est constituée de cuivre.
  4. Elément selon la revendication 1, caractérisé en ce que la deuxième couche de chromage dur (4) est essentiellement plus mince que la première couche de chromage dur (3).
  5. Elément selon la revendication 1, caractérisé en ce qu'une couche (5) de renforcement de l'adhérence est prévue entre la deuxième couche de chromage dur (4) et la couche d'indicateur (2).
  6. Elément selon la revendication 5, caractérisé en ce que la couche (5) de renforcement de l'adhérence est une amorce de nickel.
  7. Elément selon la revendication 1, caractérisé en ce qu'une couche (6) de tamponnage des contraintes est prévue entre la couche d'indicateur (2) et la deuxième couche de chromage dur (4).
  8. Elément selon la revendication 7, caractérisé en ce que la couche (6) de tamponnage des contraintes est constituée d'une couche galvanique de dispersion de nickel.
  9. Elément selon la revendication 1, caractérisé en ce que le corps de base (1) est réalisé en acier allié.
EP02732304A 2001-07-17 2002-06-10 Panier d'essorage chrome dur Expired - Lifetime EP1407060B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH131601 2001-07-17
CH13162001 2001-07-17
PCT/CH2002/000303 WO2003008667A1 (fr) 2001-07-17 2002-06-10 Panier d'essorage chrome dur

Publications (2)

Publication Number Publication Date
EP1407060A1 EP1407060A1 (fr) 2004-04-14
EP1407060B1 true EP1407060B1 (fr) 2009-04-29

Family

ID=4565373

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02732304A Expired - Lifetime EP1407060B1 (fr) 2001-07-17 2002-06-10 Panier d'essorage chrome dur

Country Status (5)

Country Link
US (1) US20040195158A1 (fr)
EP (1) EP1407060B1 (fr)
CA (1) CA2453299A1 (fr)
DE (1) DE50213503D1 (fr)
WO (1) WO2003008667A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011078655A1 (de) * 2011-07-05 2013-01-10 Voith Patent Gmbh Indikatorstab
FI124364B (fi) * 2012-06-15 2014-07-15 Valmet Technologies Inc Sihtikorin kulutuksenkestävä pinnoite ja menetelmä pinnoitteen valmistamiseksi
PT3483319T (pt) * 2017-11-09 2022-02-14 Groz Beckert Kg Ferramenta têxtil com película indicadora
CN109868395A (zh) * 2019-03-20 2019-06-11 安徽信息工程学院 一种高硬度材料及其制备方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3425900A (en) * 1964-08-24 1969-02-04 Appleton Wire Works Corp Coated papermaking wire
US3459642A (en) * 1966-11-18 1969-08-05 Schafler Armando B Process for preparing a planographic plate
US3848744A (en) * 1972-12-04 1974-11-19 J Flaherty Green pellet sizing screen
US4563399A (en) * 1984-09-14 1986-01-07 Michael Ladney Chromium plating process and article produced
DE3533534A1 (de) * 1985-09-20 1987-04-02 Blendax Werke Schneider Co Zahnaerztliches schleifwerkzeug
DE19909871A1 (de) * 1999-03-08 2000-10-05 Fraunhofer Ges Forschung Verschleißanzeige
US6585116B1 (en) * 2000-02-22 2003-07-01 Voith Sulzer Paper Technology North America, Inc. Screening apparatus for fiber suspension

Also Published As

Publication number Publication date
US20040195158A1 (en) 2004-10-07
CA2453299A1 (fr) 2003-01-30
EP1407060A1 (fr) 2004-04-14
WO2003008667A1 (fr) 2003-01-30
DE50213503D1 (de) 2009-06-10

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