JP3183603B2 - Aluminum alloy for galvanic anodic protection of steel bars in reinforced concrete and corrosion protection method using the same - Google Patents
Aluminum alloy for galvanic anodic protection of steel bars in reinforced concrete and corrosion protection method using the sameInfo
- Publication number
- JP3183603B2 JP3183603B2 JP01930494A JP1930494A JP3183603B2 JP 3183603 B2 JP3183603 B2 JP 3183603B2 JP 01930494 A JP01930494 A JP 01930494A JP 1930494 A JP1930494 A JP 1930494A JP 3183603 B2 JP3183603 B2 JP 3183603B2
- Authority
- JP
- Japan
- Prior art keywords
- aluminum alloy
- reinforced concrete
- same
- corrosion
- steel bars
- 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
Links
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
金およびそれを用いる防食方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum alloy for a galvanic anode suitable for corrosion protection of a reinforcing bar in a reinforced concrete structure, and a method of preventing corrosion using the same.
【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 Reinforcing steel in a reinforced concrete structure usually does not corrode much because concrete is strongly alkaline. However, if the above structure is placed in an environment where salt water penetrates, for example, when it is provided on seawater or in seawater, or when chloride is sprayed to prevent freezing, 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。To solve this problem, a zinc alloy has been conventionally studied in the galvanic anode method capable of providing stable corrosion protection at a low cost for a long time. This zinc alloy is one of the important characteristics of the galvanic anode. 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合金およびそれを用いる防食方法
を提供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to solve the above problems. An object of the present invention is to provide an alloy for an electroanode and a method for preventing corrosion using the same.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するもの
として、本発明は、１０〜５０重量％のＺｎ、０．１１
〜０．６重量％のＩｎを含み、残部がＡｌおよび不可避
不純物からなる鉄筋コンクリート中鉄筋の流電陽極防食
用のアルミニウム合金を提供する。また、本発明は、鉄
筋コンクリート中の鉄筋を流電陽極法により防食する方
法において、１０〜５０重量％のＺｎ、０．１１〜０．
６重量％のＩｎを含み、残部がＡｌおよび不可避不純物
からなるアルミニウム合金を流電陽極に用いることを特
徴とする防食方法を提供する。In order to achieve the above-mentioned object, the present invention provides a method for producing ZnO, comprising:
Provided is an aluminum alloy for galvanic anodic protection of a reinforcing steel bar in reinforced concrete containing up to 0.6% by weight of In with the balance being Al and inevitable impurities. The present invention also relates to a method for preventing corrosion of reinforcing steel in reinforced concrete by a galvanic anode method, wherein 10 to 50% by weight of Zn, 0.11 to 0.
An anticorrosion method is provided, wherein an aluminum alloy containing 6% by weight of In and the balance of Al and inevitable impurities is used for a galvanic anode.
【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０．１１重量％未満では、該作
用が十分発揮されない。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
りやすい。In the aluminum alloy of the present invention, both Zn and In have an effect of increasing the amount of generated electricity by suppressing self-melting of the alloy. Zn is less than 10% by weight or In is less than 0.11%. When the amount is less than the weight%, the effect is not sufficiently exhibited. Further, when Zn exceeds 50% by weight or In exceeds 0.6% by weight, the anode potential tends to be noble.
【０００７】[0007]
【実施例】［実施例１〜５、参考例１〜６、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 [Examples 1 to 5, Reference Examples 1 to 6, Comparative Examples 1 to 5]
10] Twenty-one types of aluminum alloys were melted in the air and then cast in a mold to obtain a round bar-shaped ingot having a diameter of 25 mm and a length of 250 mm. Thereafter, a performance test of a galvanic anode was performed using these ingots as samples. The test was conducted by the “Corrosion Protection Test” established by the Corrosion and Corrosion Prevention Association of Japan (“Current Protection Anode Test Method and its Explanation”, Corrosion Protection 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、ＫＣ
ｌ：３２．０ｇ／ｌ、ＮａＯＨ：２４．５／ｌ、ＫＯ
Ｈ：１０．０ｇ／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１ｍＡ／ｃｍ ２ 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 briefly described as follows.
That is, these samples have a surface of 240
The surface was polished until the surface became rough, and the other side was insulated and coated with vinyl tape except for 20 cm 2 . Next, KC
1: 32.0 g / l, NaOH: 24.5 / l, KO
An aqueous solution having a composition of H: 10.0 g / l and Ca (OH) 2 : 0.1 g / l was filled in a 1-liter beaker as a concrete simulation test solution. The sample was used as an anode in the center of the beaker, and a stainless steel cylindrical plate was arranged as a cathode along the side wall of the beaker (distance between the electrodes was 30 mm). Then, a connection was made with a DC stabilized power supply interposed between the anode and the cathode. The energization was performed under a constant current condition of an anode current density of 1 mA / cm 2 at 240 mA.
Time went on. The amount of generated electricity was calculated from the weight loss of the sample, and the anodic potential was measured using the silver-silver chloride electrode as a reference electrode immediately before the end of the energization. Table 1 shows the composition of the test 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。また、そのため、本発明の防食方法に
よれば、鉄筋コンクリート構造物中の鉄筋を好適に防食
できることも判る。As described above, the aluminum alloy of the present invention has a sufficiently large amount of generated electricity of 1500 A · hr / kg or more, and has a sufficiently low anode potential of −1000 mV or less. It turns out that it is suitable for edible use. In addition, according to the anticorrosion method of the present invention, it is also found that the reinforcing bars in the reinforced concrete structure can be suitably protected against corrosion.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平２−149637（ＪＰ，Ａ) 特開 平１−123046（ＪＰ，Ａ) 特開 平２−149635（ＪＰ，Ａ) 特公 昭48−38283（ＪＰ，Ｂ１) 特公 昭42−4444（ＪＰ，Ｂ１) ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-149637 (JP, A) JP-A-1-123046 (JP, A) JP-A-2-149635 (JP, A) 38283 (JP, B1) JP 42-4444 (JP, B1)
Claims (2)
０．６重量％のＩｎを含み、残部がＡｌおよび不可避不
純物からなる鉄筋コンクリート中鉄筋の流電陽極防食用
のアルミニウム合金。1. A 10 to 50 wt% of Zn, 0.11 ~
An aluminum alloy containing 0.6% by weight of In for balance current anodic corrosion protection of reinforcing steel in reinforced concrete, the balance consisting of Al and unavoidable impurities.
により防食する方法において、１０〜５０重量％のＺ
ｎ、０．１１〜０．６重量％のＩｎを含み、残部がＡｌ
および不可避不純物からなるアルミニウム合金を流電陽
極に用いることを特徴とする防食方法。2. A method of corrosion by galvanic anode method rebar in concrete, 10 to 50 wt% of Z
n, containing 0.11 to 0.6% by weight of In, with the balance being Al
And aluminum alloy consisting of unavoidable impurities
An anticorrosion method characterized by being used for poles .
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 |
| DE69516738T DE69516738D1 (en) | 1994-02-16 | 1995-02-14 | Sacrificial anode for cathodic corrosion protection and alloy therefor |
| AT95101956T ATE192782T1 (en) | 1994-02-16 | 1995-02-14 | SACRIFICIAL ANODE FOR CATHODIC CORROSION PROTECTION AND ALLOY THEREFOR |
| EP95101956A EP0668364B1 (en) | 1994-02-16 | 1995-02-14 | 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 |
| MXPA/A/1995/000945A MXPA95000945A (en) | 1994-02-16 | 1995-02-15 | Sacrificatory anode for cathodic protection and my alloy |
| 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 |
| FI950666A FI111385B (en) | 1994-02-16 | 1995-02-15 | Galvanic anode for cathodic protection and alloy therefor |
| 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 JPH07228937A (en) | 1995-08-29 |
| JP3183603B2 true 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) |
Families Citing this family (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 |
| JP6255253B2 (en) * | 2014-01-24 | 2017-12-27 | 住友大阪セメント株式会社 | Thermal spray material for anode, method for producing thermal spray coating for anode, and method for cathodic protection of concrete structure |
-
1994
- 1994-02-16 JP JP01930494A patent/JP3183603B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07228937A (en) | 1995-08-29 |
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