JPH07228937A - Aluminum alloy for galvanic anode - Google Patents
Aluminum alloy for galvanic anodeInfo
- Publication number
- JPH07228937A JPH07228937A JP6019304A JP1930494A JPH07228937A JP H07228937 A JPH07228937 A JP H07228937A JP 6019304 A JP6019304 A JP 6019304A JP 1930494 A JP1930494 A JP 1930494A JP H07228937 A JPH07228937 A JP H07228937A
- Authority
- JP
- Japan
- Prior art keywords
- alloy
- anode
- sufficiently
- aluminum alloy
- galvanic anode
- 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
Landscapes
- Prevention Of Electric Corrosion (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鉄筋コンクリート構造
物中の鉄筋の防食用に好適な流電陽極用アルミニウム合
金に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum alloy for galvanic anodes suitable for corrosion protection of reinforcing bars in reinforced concrete structures.
【０００２】[0002]
【従来の技術】鉄筋コンクリート構造物中の鉄筋は、コ
ンクリートが強アルカリであるため、通常腐食はあまり
進行しない。しかし、上記構造物が、例えば海水上や海
水中に設けられたり、凍結防止用に塩化物が散布された
りして塩水が浸透する環境に置かれると、腐食の進行が
問題になる。2. Description of the Related Art Corrosion of reinforcing bars in a reinforced concrete structure does not usually progress because the concrete is a strong alkali. However, when the above-mentioned structure is provided in, for example, seawater or seawater, or chloride is sprayed to prevent freezing, and the structure is placed in an environment where salt water penetrates, the progress of corrosion becomes a problem.
【０００３】この問題に対して、長期間低廉で安定した
防食ができる流電陽極法においては、従来亜鉛合金が検
討されているが、この亜鉛合金は流電陽極の重要な特性
の一つである陽極電位が高すぎるという問題点がある。In order to solve this problem, zinc alloys have been conventionally studied in the galvanic anode method, which is inexpensive and stable in corrosion protection for a long time. This zinc alloy is one of the important characteristics of galvanic anodes. There is a problem that a certain anode potential is too high.
【０００４】[0004]
【発明が解決しようとする課題】本発明の目的は、上記
問題点を解消し、鉄筋コンクリート構造物中の鉄筋の防
食用に好適な、即ち陽極電位が充分卑で、発生電気量が
充分大きい流電陽極用アルミニウム合金を提供すること
にある。SUMMARY OF THE INVENTION The object of the present invention is to solve the above problems and to provide a flow suitable for the corrosion protection of the reinforcing bars in the reinforced concrete structure, that is, the anode potential is sufficiently base and the generated electricity is sufficiently large. An object is to provide an aluminum alloy for an electrolytic anode.
【０００５】[0005]
【課題を解決するための手段】本発明は、上記目的を達
成するものとして、１０〜５０重量％のＺｎ、０．０３
〜０．６重量％のＩｎを含み、残部がＡｌおよび不可避
不純物からなる流電陽極用アルミニウム合金である。In order to achieve the above object, the present invention provides 10 to 50% by weight of Zn, 0.03
It is an aluminum alloy for galvanic anodes that contains ˜0.6 wt% In and the balance is Al and inevitable impurities.
【０００６】[0006]
【作用】本発明のアルミニウム合金において、Ｚｎおよ
びＩｎはいずれも、該合金の自己溶解を抑制することに
より発生電気量を大きくする作用があり、Ｚｎが１０重
量％未満、またはＩｎが０．０３重量％未満では、該作
用が充分発揮されない。また、Ｚｎが５０重量％を超え
るかＩｎが０．６重量％を超えると、陽極電位が貴にな
り易い。In the aluminum alloy of the present invention, Zn and In both have the effect of increasing the amount of electricity generated by suppressing the self-dissolution of the alloy, and Zn is less than 10% by weight or In is 0.03%. If it is less than wt%, the action is not sufficiently exhibited. If the Zn content exceeds 50 wt% or the In content exceeds 0.6 wt%, the anode potential tends to become noble.
【０００７】[0007]
実施例１〜１１、比較例１〜１０ ２１種類のアルミニウム合金を大気溶解した後、金型鋳
造して、直径２５ｍｍ、長さ２５０ｍｍの丸棒形状の鋳
塊を得た。その後、これらの鋳塊を試料として、流電陽
極の性能試験を行なった。試験は、（社）腐食防食協会
が制定した「流電陽極試験法」（「流電陽極試験法およ
び同解説」、防食技術、Ｖｏｌ．３１，ｐ６１２〜６２
０，１９８２）に準拠して実施した。Examples 1 to 11 and Comparative Examples 1 to 10 21 kinds of aluminum alloys were melted in the atmosphere and then die-cast to obtain round bar-shaped ingots having a diameter of 25 mm and a length of 250 mm. Then, a performance test of the galvanic anode was performed using these ingots as samples. The test was carried out by the "Corrosion and Anticorrosion Association""galvanic anode test method"("galvanic anode test method and description", anticorrosion technology, Vol. 31, p612-62).
0,1982).
【０００８】上記試験法を略述すると次の通りである。
即ち、これらの試料は、表面をサンドペーパーの２４０
番の粗さになるまで研磨し、側面を２０ｃｍ2 残して他
はビニールテープを用いて絶縁被覆した。次に、ＫＣｌ
３２．０ｇ／ｌ、ＮａＯＨ２４．５／ｌ、ＫＯＨ１
０．０ｇ／ｌ、Ｃａ（ＯＨ）2 ０．１ｇ／ｌなる組成の
水溶液をコンクリート模擬試験液として１リットルのビ
ーカー内に満たした。試料はビーカー中央に陽極とし、
ステンレス円筒板をビーカー側壁に沿って陰極として配
置した（極間距離３０ｍｍ）。そして、陽極と陰極との
間に直流安定化電源を挟んで結線した。通電は、陽極電
流密度０．１ｍＡ／ｃｍ2 の定電流条件で２４０時間行
なった。発生電気量は、試料の重量減から算出し、また
陽極電位は、通電終了直前の陽極電位を銀−塩化銀電極
を参照電極として測定した。供試陽極試料の組成および
得られた結果を表１に示す。The above test method is summarized as follows.
That is, these samples had a surface of sandpaper of 240
The surface was ground to a roughness of 20 mm, and the side surface was left with 20 cm 2 and the others were covered with vinyl tape for insulation. Next, KCl
32.0 g / l, NaOH 24.5 / l, KOH1
An aqueous solution having a composition of 0.0 g / l and Ca (OH) 2 0.1 g / l was filled in a 1 liter beaker as a concrete simulated test solution. The sample is the anode in the center of the beaker,
A stainless steel cylindrical plate was arranged as a cathode along the side wall of the beaker (distance between electrodes: 30 mm). Then, a direct current stabilized power supply was sandwiched between the anode and the cathode for connection. The energization was performed for 240 hours under the constant current condition of the anode current density of 0.1 mA / cm 2 . The amount of electricity generated was calculated from the weight reduction of the sample, and the anode potential was measured by using the silver-silver chloride electrode as a reference electrode for the anode potential immediately before the end of energization. Table 1 shows the composition of the tested anode sample and the obtained results.
【０００９】[0009]
【表１】 [Table 1]
【００１０】[0010]
【発明の効果】以上から、本発明のアルミニウム合金
は、発生電気量が１５００Ａ・ｈｒ／ｋｇ以上と充分大
きく、また陽極電位が−１０００ｍＶ以下と充分卑であ
り、鉄筋コンクリート構造物中の鉄筋の防食用に好適で
あることが判る。As described above, the aluminum alloy of the present invention has a sufficiently large generated electricity amount of 1500 A · hr / kg or more and an anode potential of −1000 mV or less, which is sufficiently base, and prevents the reinforcement of reinforcing steel in a reinforced concrete structure. It turns out to be suitable for food.
Claims (1)
０．６重量％のＩｎを含み、残部がＡｌおよび不可避不
純物からなる流電陽極用アルミニウム合金。1. 10 to 50% by weight of Zn, 0.03 to
An aluminum alloy for galvanic anode, which contains 0.6% by weight of In and the balance is Al and inevitable impurities.
Priority Applications (11)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01930494A JP3183603B2 (en) | 1994-02-16 | 1994-02-16 | Aluminum alloy for galvanic anodic protection of steel bars in reinforced concrete and corrosion protection method using the same |
| CA002142244A CA2142244C (en) | 1994-02-16 | 1995-02-10 | Sacrificial anode for cathodic protection and alloy therefor |
| US08/387,158 US6673309B1 (en) | 1994-02-16 | 1995-02-10 | Sacrificial anode for cathodic protection and alloy therefor |
| SG1996001123A SG50423A1 (en) | 1994-02-16 | 1995-02-14 | Sacrificial anode for cathodic protection and alloy therefor |
| EP95101956A EP0668364B1 (en) | 1994-02-16 | 1995-02-14 | Sacrificial anode for cathodic protection and alloy therefor |
| AT95101956T ATE192782T1 (en) | 1994-02-16 | 1995-02-14 | SACRIFICIAL ANODE FOR CATHODIC CORROSION PROTECTION AND ALLOY THEREFOR |
| DE69516738T DE69516738D1 (en) | 1994-02-16 | 1995-02-14 | Sacrificial anode for cathodic corrosion protection and alloy therefor |
| FI950666A FI111385B (en) | 1994-02-16 | 1995-02-15 | Galvanic anode for cathodic protection and alloy therefor |
| NO19950566A NO312204B1 (en) | 1994-02-16 | 1995-02-15 | Method of providing cathodic protection for a reinforced concrete structure, and alloy for a sacrificial anode for use with the method |
| MXPA/A/1995/000945A MXPA95000945A (en) | 1994-02-16 | 1995-02-15 | Sacrificatory anode for cathodic protection and my alloy |
| KR1019950002890A KR0165720B1 (en) | 1994-02-16 | 1995-02-16 | Aluminium alloy for galvanic anode |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01930494A JP3183603B2 (en) | 1994-02-16 | 1994-02-16 | Aluminum alloy for galvanic anodic protection of steel bars in reinforced concrete and corrosion protection method using the same |
| US08/387,158 US6673309B1 (en) | 1994-02-16 | 1995-02-10 | Sacrificial anode for cathodic protection and alloy therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07228937A true JPH07228937A (en) | 1995-08-29 |
| JP3183603B2 JP3183603B2 (en) | 2001-07-09 |
Family
ID=32299863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP01930494A Expired - Lifetime JP3183603B2 (en) | 1994-02-16 | 1994-02-16 | Aluminum alloy for galvanic anodic protection of steel bars in reinforced concrete and corrosion protection method using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3183603B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6673309B1 (en) | 1994-02-16 | 2004-01-06 | Corrpro Companies, Inc. | Sacrificial anode for cathodic protection and alloy therefor |
| JP2015137424A (en) * | 2014-01-24 | 2015-07-30 | 住友大阪セメント株式会社 | Thermal spray material for anode, thermal spray coating for anode and electric anti-corrosion method of concrete structure |
-
1994
- 1994-02-16 JP JP01930494A patent/JP3183603B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6673309B1 (en) | 1994-02-16 | 2004-01-06 | Corrpro Companies, Inc. | Sacrificial anode for cathodic protection and alloy therefor |
| JP2015137424A (en) * | 2014-01-24 | 2015-07-30 | 住友大阪セメント株式会社 | Thermal spray material for anode, thermal spray coating for anode and electric anti-corrosion method of concrete structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3183603B2 (en) | 2001-07-09 |
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