US3694196A - Aluminum alloy for galvanic anode - Google Patents

Aluminum alloy for galvanic anode Download PDF

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Publication number
US3694196A
US3694196A US186218A US3694196DA US3694196A US 3694196 A US3694196 A US 3694196A US 186218 A US186218 A US 186218A US 3694196D A US3694196D A US 3694196DA US 3694196 A US3694196 A US 3694196A
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United States
Prior art keywords
anode
aluminum
alloy
gallium
tin
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Expired - Lifetime
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US186218A
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English (en)
Inventor
Kazuo Toda
Tosuke Murai
Chikatoshi Miura
Yuichi Tamura
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Mitsubishi Metal Corp
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Mitsubishi Metal Corp
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/10—Alloys based on aluminium with zinc as the next major constituent

Definitions

  • This invention relates to a metal alloy for use as the galvanic anode, and, more particularly, to an aluminum alloy for such galvanic anode having an improved galvanic, or anode current characteristics.
  • single figure is a graphical representation showing a relationship between the anode current density and the galvanic (or anode) current efiiciency of the galvanic anode made of the alloy according to the present invention.
  • the aluminum alloy for the galvanic anode according to the present invention is an improvement in the known alloy of this type and purpose.
  • It is another object of the present invention to provide The present invention has succeeded in developing the aluminum alloy for the galvanic anode having further improved electrical properties by adding to the alloy consisting of aluminum, zinc, and tin particular elements capable of imparting galvanic anode characteristics such as, for example, bismuth, gallium, etc.
  • the resulting anode When 0.5 to 10% of zinc is added to the base aluminum, the resulting anode possesses a stabilized low anode potential and high galvanic current efiiciency.
  • the zinc content of below 0.5% does not result in any appreciable improvement in the anode (galvanic) current efliciency.
  • the zinc content exceeding 10% does not yield so remarkable an effect as in the content of less than 10%.
  • Addition of tin at a rate of below 0.05% increases the anode potential and lowers the anode current efiiciency. Again, when the tin content exceeds 1.0%, the current efliciency also lowers. From this, the appropriate content of tin in the alloy is from 0.05 to 1.0%.
  • the appropriate adding quantity of bismuth is found to be equal to or less than that of tin. If the adding quantity of bismuth exceeds 1.0%, adhesion of corrosion product to the anode surface increases, and the condition for elution (a state of galvanic dissolution of the anode) deteriorates. With the gallium content of below 0.005%, no current eiiiciency improves. However, within the range of from 0.005 to 0.3%, improvement in the current eiiiciency can be recognized. Further increase in the adding quantity of gallium lowers the current efficiency, while low anode potential which is one of the characteristics of this invention is resulted. However, addition of large amount of gallium causes irregularity in dissolution on the anode surface, which brings about undesirable slimming phenomenon at the dissolved portion, accompanying impairment of economic value of the alloy product, hence the quantity exceeding 1.0% is not recommendable.
  • EXAMPLE An aluminum base metal (containing 0.12% of iron, 0.08% of silicon, 0.003% of copper, and remainder of aluminum) was dissolved in a graphite crucible, and, at a temperature of 680 C., zinc, tin, bismuth, and gallium are simultaneously added to the molten base metal, sufficiently agitated, and cast into an ingot of the alloy composition as shown in the following Table 2.
  • anode current efliciency are as shown in the figure, from which it will be noted that the anode of this alloy maintains its high performance even at a low current density, and, while its conditions for elution may be local at the initial stage, the dissolution of the anode surface proceeds with lapse of time until the entire surface thereof dissolves with the consequence that there is no possibility of adhesion of corrosion products, and the anode can be successfully used at a high specific resistance, which greatly contributes to the corrosion engrneermg.
  • Aluminum alloy for galvanic anode which consists of 05-10% zinc, 0.05-1.0% tin, 0.05-1.0% bismuth, 0.0051.0% gallium, and remainder of aluminum.
  • Alloy of claim 1 consisting of 6.0% zinc, 0.05% tin, 0.1% bismuth, 0.01% gallium, and remainder of aluminum.
  • Alloy of claim 1 consisting of 0.5% zinc, 0.1% tin, 0.1% bismuth, 0.01% gallium, and remainder of aluminum.
  • Alloy of claim 1 consisting of 6.0% zinc, 0.05% tin, 0.05% bismuth, 0.005% gallium, and remainder of aluminum.
  • Alloy of claim 1 consisting of 6.0% zinc, 0.1% tin, 0.1% bismuth, 0.01% gallium, and remainder of aluminum.
  • Alloy of claim 1 consisting of 6.0% zinc, 0.1% tin, 0.05% bismuth, 0.01% gallium, and remainder of aluminum.
  • the comparative alloy samples are of the known alloy composition as well as those produced by adding to the aluminum base any one of the above-mentioned alloying components.
  • the alloys of the present invention in which all of the alloying components are properly combined and added to the base aluminum, exhibit the current efiiciency of higher than 90% at the anode potential of from 1.0 v. to 1.1 v., and or so at about -1.5 v.
  • Alloy of claim 1 consisting of 6.0% zinc, 1.0% tin, 1.0% bismuth, 0.1% gallium, and remainder of aluminum.
  • Alloy of claim 1 consisting of 10.0% zinc, 0.1% tin, 0.1% bismuth, 0.01% gallium, and remainder of aluminum.
  • Alloy of claim 1 consisting of 10.0% zinc, 1.0% tin, 1.0% bismuth, 0.1% gallium, and remainder of aluminum.
  • Alloy of claim 1 consisting of 2.0% zinc, 0.5% tin, 0.5% bismuth, 0.3% gallium, and remainder of aluminum.
  • Alloy of claim 1 consisting of 6.0% zinc, 0.5% tin, 0.5% bismuth, 0.3% gallium, and remainder of Ga, and remainder of A l) for its anode current density aluminum.
  • Alloy pf claim 1 cor istlng of 6.0% zir c, 1.0% Referenges Cited glndmilfigzi. blsmuth, 0.3% galhum, and remamder of UNITED STATES PATENTS 14. Alloy 9f claim 1 consistlng of 2.0% zix c, 1.0% 3,616,420 10/1971 Brougham 75-146 b1smuth, 0.5% gallium, and remamder of 5 RICHARD O DEAN Primary Examiner 15. Alloy of claim 1 consisti ng of 6.0% zin c, 1.0% US CL tm, 1.0% blsmuth, 0.5% galllum, and remalnder of aluminum. 75-140; 204-148, 197, 293

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Prevention Of Electric Corrosion (AREA)
US186218A 1970-10-07 1971-10-04 Aluminum alloy for galvanic anode Expired - Lifetime US3694196A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45087521A JPS4838285B1 (enrdf_load_stackoverflow) 1970-10-07 1970-10-07

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US3694196A true US3694196A (en) 1972-09-26

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US186218A Expired - Lifetime US3694196A (en) 1970-10-07 1971-10-04 Aluminum alloy for galvanic anode

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US (1) US3694196A (enrdf_load_stackoverflow)
JP (1) JPS4838285B1 (enrdf_load_stackoverflow)
DE (1) DE2150102A1 (enrdf_load_stackoverflow)
GB (1) GB1358899A (enrdf_load_stackoverflow)
NO (1) NO127628B (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2305506A1 (fr) * 1975-03-24 1976-10-22 British Aluminium Co Ltd Perfectionnements aux alliages a base d'aluminium
US4141725A (en) * 1977-02-14 1979-02-27 Nihon Boshoku Kogyo Kabushiki Kaisha Aluminum alloy for galvanic anode
US4166755A (en) * 1977-11-02 1979-09-04 Swiss Aluminium Ltd. Aluminum alloy capacitor foil and method of making

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55164U (enrdf_load_stackoverflow) * 1979-05-30 1980-01-05
JPS5518600U (enrdf_load_stackoverflow) * 1979-06-18 1980-02-05
DE3522166C1 (de) * 1985-06-21 1986-08-07 Daimler-Benz Ag, 7000 Stuttgart Verwendung von Aluminium und einer Aluminiumlegierung zur Herstellung von faserverstaerkten Aluminiumgussteilen
FR2713244B1 (fr) * 1993-10-29 1996-01-12 France Etat Armement Anode consommable de protection cathodique en alliage à base d'aluminium.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2305506A1 (fr) * 1975-03-24 1976-10-22 British Aluminium Co Ltd Perfectionnements aux alliages a base d'aluminium
US4141725A (en) * 1977-02-14 1979-02-27 Nihon Boshoku Kogyo Kabushiki Kaisha Aluminum alloy for galvanic anode
US4166755A (en) * 1977-11-02 1979-09-04 Swiss Aluminium Ltd. Aluminum alloy capacitor foil and method of making

Also Published As

Publication number Publication date
GB1358899A (en) 1974-07-03
NO127628B (enrdf_load_stackoverflow) 1973-07-23
JPS4838285B1 (enrdf_load_stackoverflow) 1973-11-16
DE2150102A1 (de) 1972-04-13

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