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Surface activated alloy electrodes and process for preparing them

Assignee: Daiki Ataka Engineering Co Ltd
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Filing: 1990-02-16
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Granted: 1990-10-23
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Expires: 2010-02-16
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Abstract

Abstract Surface activated surface alloy electrodes and a process for preparing them high in corrosion resistance and activity, comprising a corrosion-resistant metal selected from, or a corrosion-resistant alloy composed of two or more metals selected from titanium, zirconium, niobium and tantalum, or a corrosion-resistant metal selected from, or a corrosion-resistant alloy composed of two or more metals selected from titanium, zirconium, niobium and tantalum clad with a corrosion-resistant metal selected from, or a corrosion-resistant alloy composed of two or more metals selected from titanium, zirconium, niobium and tantalum, or with any other metal or alloy, rolled or non-rolled, being used as a substrate metal or alloy; an alloy consisting of 20 to 67 atomic % of one or more metals selected from titanium, zirconium, niobium and tantalum, 0.01 to 10 atomic % of oine or more platinum group metals of ruthenium, rhodium, palladium, iridium and platinum, and substantially the remaining amount of nickel and/or cobalt, existing on said substrate metal or alloy as a rapidly solidified surface alloy of 150 μm or less thickness containing amorphous phase at least partially; and said surface alloy, being treated to be activated on the surface.

Inventors

  • 👤 Koji Hashimoto
  • 👤 Naokazu Kumagai
  • 👤 Katsuhiko Asami
  • 👤 Asahi Kawashima

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 04:28
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/32; C; C23; C23C; C23C26/00; C23C26/02; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/055; C25B11/069; Y; Y10; Y10S; Y10S148/00; Y10S148/902; Y10S148/903; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12812; Y10T428/12993

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 193 words
Surface activated surface alloy electrodes high in corrosion resistance and activity, comprising: A. a substrate selected from the group consisting of (i) a corrosion-resistant metal selected from titanium, zirconium, niobium and tantalum, (ii) a corrosion-resistant alloy composed of two or more metals selected from titanium, zirconium, niobium and tantalum, and (iii) (i) or (ii) clad with a corrosion-resistant metal or a corrosion-resistant-alloy, and B. a solid surface alloy layer on substrate A, said solid surface alloy consisting of 20 to 67 atomic % of one or more metals selected from titanium, zirconium, niobium and tantalum, 0.01 to 10 atomic % of one or more platinum group metals of ruthenium, rhodium, palladium, iridium and platinum, and substantially the remaining amount of nickel and/or cobalt, and said solid surface alloy containing an amorphous phase of 150 μm or less thickness as a result of being formed by irradiation melting of high energy density beam followed by self quenching; the surface of said solid surface alloy being activated by surface roughening and enrichment of platinum group elements as a result of immersion in corrosive solution capable of dissolving nickel, cobalt, titanium, zirconium, niobium and tantalum selectively.
Claim 2
Dependent Claim 193 words
Surface activated surface alloy electrodes high in corrosion resistance and activity, comprising: A. a substrate selected from the group consisting of (i) a corrosion-resistant metal selected from titanium, zirconium, niobium and tantalum, (ii) a corrosion-resistant alloy composed of two or more metals selected from titanium, zirconium, niobium and tantalum, and (iii) (i) or (ii) clad with a corrosion-resistant metal or a corrosion-resistant-alloy, and B. a solid surface alloy layer on substrate A, said solid surface alloy consisting of 20 to 67 atomic % of one or more metals selected from titanium, zirconium, niobium and tantalum, 0.01 to 10 atomic % of one or more platinum group metals of ruthenium, rhodium, palladium, iridium and platinum, and substantially the remaining amount of nickel and/or cobalt, and said solid surface alloy containing an amorphous phase of 150 μm or less thickness as a result of being formed by irradiation melting of high energy density beam followed by self quenching; the surface of said solid surface alloy being activated by surface roughening and enrichment of platinum group elements as a result of immersion in corrosive solution capable of dissolving nickel, cobalt, titanium, zirconium, niobium and tantalum selectively.
Claim 3
Dependent Claim 32 words
Surface activated surface alloy electrodes according to claim 1 wherein the corrosion-resistant substrate (i) or (ii) is clad with a metal selected from the group consisting of titanium, zirconium, niobium and tantalum.
Claim 4
Dependent Claim 33 words
Surface activated surface alloy electrodes according to claim 1 wherein the corrosion-resistant substrate (i) or (ii) is clad with a metal alloy selected from the group consisting of titanium, zirconium, niobium and tantalum.

References Cited (Backward Citations)

US4253933A Cited
US4339270A Cited
US4544473A Cited
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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1993-10-22 1994-04-23 1994-10-23 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1997-10-22 1998-04-23 1998-10-23 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2001-10-22 2002-04-23 2002-10-23 $7700.00 Window Closed / Lapsed

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