EP2276866A1 - Cadmium-free zinc-based alloy, its use as a sacrificial anode, a sacrificial anode, and a method for cathodic protection of corrosion-threatened constructions in aggressive environment - Google Patents
Cadmium-free zinc-based alloy, its use as a sacrificial anode, a sacrificial anode, and a method for cathodic protection of corrosion-threatened constructions in aggressive environmentInfo
- Publication number
- EP2276866A1 EP2276866A1 EP09724942A EP09724942A EP2276866A1 EP 2276866 A1 EP2276866 A1 EP 2276866A1 EP 09724942 A EP09724942 A EP 09724942A EP 09724942 A EP09724942 A EP 09724942A EP 2276866 A1 EP2276866 A1 EP 2276866A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- weight
- maximum
- sacrificial anode
- cadmium
- zinc
- 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.)
- Granted
Links
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 37
- 239000000956 alloy Substances 0.000 title claims abstract description 37
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 18
- 239000011701 zinc Substances 0.000 title claims abstract description 18
- 238000010276 construction Methods 0.000 title claims description 6
- 238000000034 method Methods 0.000 title claims description 6
- 238000004210 cathodic protection Methods 0.000 title claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 18
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 18
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052751 metal Inorganic materials 0.000 claims abstract description 12
- 239000002184 metal Substances 0.000 claims abstract description 12
- 229910052738 indium Inorganic materials 0.000 claims abstract description 11
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052793 cadmium Inorganic materials 0.000 claims abstract description 9
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000010949 copper Substances 0.000 claims abstract description 9
- 150000002739 metals Chemical class 0.000 claims abstract description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 8
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 8
- 229910052716 thallium Inorganic materials 0.000 claims abstract description 8
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 13
- 229910052742 iron Inorganic materials 0.000 claims description 6
- CHBRHODLKOZEPZ-UHFFFAOYSA-N Clotiazepam Chemical compound S1C(CC)=CC2=C1N(C)C(=O)CN=C2C1=CC=CC=C1Cl CHBRHODLKOZEPZ-UHFFFAOYSA-N 0.000 claims 1
- 238000005266 casting Methods 0.000 abstract description 20
- 238000003754 machining Methods 0.000 abstract description 5
- 238000005336 cracking Methods 0.000 abstract 1
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 229910021607 Silver chloride Inorganic materials 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 2
- 238000011109 contamination Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
-
- 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
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
- C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
- C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
- C23F13/12—Electrodes characterised by the material
- C23F13/14—Material for sacrificial anodes
Definitions
- CADMIUM-FREE ZINC-BASED ALLOY. ITS USE AS A SACRIFICIAL ANODE. A SACRIFICIAL ANODE, AND A METHOD FOR CATHODlC PROTECTION OF CORROSION-THREATENED CONSTRUCTIONS IN AGGRESSIVE ENVIRONMENT
- This invention relates to a new zinc-based alloy; the said alloy for use as the active part of a sacrificial anode; the use of the alloy as the active part of such an anode; a sacrificial anode, the active part of which is an alloy according to the invention; as well as a method for cathodic protection of corrosion-threatened constructions in aggressive environment.
- Know alloys such as e.g. known from WO 00/26426, can be used for casting anodes of a relatively large size, the order of magnitude of the smallest dimension being several centimeters
- the inventors have realised that a tendency of breaking or crack development is observed, especially in connection with machining, e.g. threading or boring, aftei casting of the anodes.
- Another feature indicated to be essential in this document is that the sacrificial anodes should be free from cadmium, i which poses a substantial risk factor' with respect to loading and contamination of the environment
- An alloy according to the invention which is preferred on account of its particular advantages regarding casting of small anodes, consists substantially of 0 4 - 0.6% by weight of aluminum, 0 02 - 0 03% by weight of indium, maximum 0 001% by weight of cadmium, maximum 0 005% by weight of iron, maximum 0 005% by weight of copper, maximum 0 006% by weight of lead, maximum 0 0005% of tin, maximum 0 10% by weight of other metals, in particular nickel and thallium, and balance zinc having a purity of about 99 995 %
- a particularly piefe ⁇ ed alloy according to the invention which with a suitable margin avoids the problems mentioned above, when the aluminum content is less than 0 4% by weight or more than 0 6% by weight, consists substantially of 0.45 - 0 55% by weight of aluminum, 0 02 - 0 03% by weight of indium, maximum 0 001% by weight of cadmium, maximum 0 005% by weight of iron, maximum 0 005% by weight of copper, maximum 0 006% by weight of lead maximum 0 0005% of tin, maximum 0.10% by weight of other metals, in particular nickel and thallium, and balance zinc having a purity of about 99 995 %
- the high price of indium makes it advantageous to have a narrower indication of the amount of indium in the alloy and accordingly a more preferred alloy according to the invention consists substantially of 04 - 0 6% by weight of aluminum, 0 024 - 0 026% by weight of indium, maximum 0 001% by weight of cadmium, maximum 0 005% by weight of iron, maximum 0 005% by weight of copper, maximum 0 006% by weight of lead, maximum 0 0005% of tin, maximum 0 10% by weight of other metals, in particular nickel and thallium, and balance zinc having a purity of about 99 995 %
- WO 00/26426 suggests an alloy having a content of aluminum between 0 1 and 1% by weight, but only one of the specific embodiments shown in the table of this document, namely specimen No, 7, has an aluminum content in the na ⁇ ower range in accordance with the present invention
- this specimen No 7 has an indium content of 500 ppm, which is outside the range provided for the alloy in accordance with the present invention, and furiheirnoie the result of this specimen is indicated to be an anode with a coarse grained surface, which would not be acceptable for a relatively small anode in accordance with the present invention
- this relatively coarse grained surface indicates a tendency of crack development, as indicated above
- This invention also relates to a zinc-based alloy as described above for use as the active part of a sacrificial anode, and the invention also relates to the use of an alloy of the present type as the active part of a sacrificial anode
- the invention relates to a sacrificial anode, the active part of which is a zinc-based alloy of the present type, as well as a method for the cathodic protection of corrosion- thieatened constructions in aggressive environment, in particular smaller components, and this method is characterized in that the constructions aie protected by using a sacrificial anode according to the invention.
- the invention is further illustrated by means of the following test results obtained with alloys according to the invention, the test having been carried out according to the directions in the 'Det Norske Veritas 1 Offshore-standard RP B 401; the potentials have been measured vs Ag/AgCl/seawater Alloy in accordance with the present invention:
- the performance data were substantially identical to the performance data for the alloy in accordance with the invention, despite the change of content of aluminum, However, with a content of aluminum of 0 4% and 0 1%, the casting becomes brittle and has a tendency to breakage or crack development, especially when post machining the castings. Furthermore, a tendency io ciack development during solidification of the casting has been observed Aluminum content higher than in accordance with the present invention:
- test alloys according to the invention substantially meet the requirements according to U S MilI-A-1800 Kl and for a substantial part show even more advantageous values, and furthermore the test results show that small electrodes having a smallest dimensioning in the order of 5-10 mm or less can be cast with said alloy.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Prevention Of Electric Corrosion (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DKPA200800453 | 2008-03-28 | ||
US4201308P | 2008-04-03 | 2008-04-03 | |
PCT/IB2009/051239 WO2009118693A1 (en) | 2008-03-28 | 2009-03-25 | Cadmium-free zinc-based alloy, its use as a sacrificial anode, a sacrificial anode, and a method for cathodic protection of corrosion-threatened constructions in aggressive environment |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2276866A1 true EP2276866A1 (en) | 2011-01-26 |
EP2276866B1 EP2276866B1 (en) | 2011-09-07 |
Family
ID=40940375
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09724942A Active EP2276866B1 (en) | 2008-03-28 | 2009-03-25 | Cadmium-free zinc-based alloy, its use as a sacrificial anode, a sacrificial anode, and a method for cathodic protection of corrosion-threatened constructions in aggressive environment |
Country Status (5)
Country | Link |
---|---|
US (1) | US20110089047A1 (en) |
EP (1) | EP2276866B1 (en) |
AT (1) | ATE523609T1 (en) |
ES (1) | ES2373024T3 (en) |
WO (1) | WO2009118693A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101928944B (en) * | 2010-03-12 | 2012-04-18 | 邹积强 | Alloy sacrificial anode film preventing stress corrosion cracking and preparation method thereof |
FR2989386B1 (en) * | 2012-04-12 | 2014-04-04 | A M P E R E Ind | ZINC-BASED ALLOY AND SACRIFICIAL ZINC-BASED ANODE |
CN103243238A (en) * | 2013-05-23 | 2013-08-14 | 南通鑫祥锌业有限公司 | Zinc composite material for alloy zinc belt |
US11634822B2 (en) * | 2017-09-15 | 2023-04-25 | Onesubsea Ip Uk Limited | Systems and methods for providing monitored and controlled cathodic protection potential |
EP3647465A1 (en) * | 2018-11-05 | 2020-05-06 | BAC Corrosion Control A/S | Zink-based sacrificial anode alloy, use of a zink-based alloy, and a sacrificial anode |
CN112853359A (en) * | 2021-01-05 | 2021-05-28 | 中国石油天然气股份有限公司 | Sacrificial anode material and preparation method and application thereof |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6152337A (en) * | 1984-08-20 | 1986-03-15 | Nippon Mining Co Ltd | Zinc alloy for hot dip galvanizing |
RU1788064C (en) * | 1991-04-22 | 1993-01-15 | Государственный научно-исследовательский, проектный и конструкторский институт сплавов и обработки цветных металлов "Гипроцветметобработка" | Alloy on the basis of zinc for anodes, and a method of its working |
DK173514B1 (en) * | 1998-11-03 | 2001-01-22 | Bac Corrosion Control As | Zinc-based alloy, its use as a sacrificial anode, sacrificial anode and cathodic protection method |
JP4552171B2 (en) * | 1999-02-09 | 2010-09-29 | エヌ ヴェ ユミコア ソシエテ アノニム | Centrifugal atomized zinc alloy powder for alkaline batteries |
-
2009
- 2009-03-25 EP EP09724942A patent/EP2276866B1/en active Active
- 2009-03-25 AT AT09724942T patent/ATE523609T1/en not_active IP Right Cessation
- 2009-03-25 US US12/934,867 patent/US20110089047A1/en not_active Abandoned
- 2009-03-25 ES ES09724942T patent/ES2373024T3/en active Active
- 2009-03-25 WO PCT/IB2009/051239 patent/WO2009118693A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2009118693A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE523609T1 (en) | 2011-09-15 |
EP2276866B1 (en) | 2011-09-07 |
US20110089047A1 (en) | 2011-04-21 |
ES2373024T3 (en) | 2012-01-30 |
WO2009118693A1 (en) | 2009-10-01 |
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