JPH04157126A - Aluminum alloy for calvanic anode - Google Patents
Aluminum alloy for calvanic anodeInfo
- Publication number
- JPH04157126A JPH04157126A JP27771390A JP27771390A JPH04157126A JP H04157126 A JPH04157126 A JP H04157126A JP 27771390 A JP27771390 A JP 27771390A JP 27771390 A JP27771390 A JP 27771390A JP H04157126 A JPH04157126 A JP H04157126A
- Authority
- JP
- Japan
- Prior art keywords
- alloy
- weight
- anode
- corrosion
- amount
- 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.)
- Pending
Links
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 10
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 8
- 239000010959 steel Substances 0.000 abstract description 8
- 239000013535 sea water Substances 0.000 abstract description 6
- 229910052725 zinc Inorganic materials 0.000 abstract description 3
- 229910052738 indium Inorganic materials 0.000 abstract 2
- 238000005260 corrosion Methods 0.000 description 18
- 230000005611 electricity Effects 0.000 description 18
- 229910045601 alloy Inorganic materials 0.000 description 17
- 239000000956 alloy Substances 0.000 description 17
- 230000007797 corrosion Effects 0.000 description 14
- 230000000694 effects Effects 0.000 description 14
- 238000000034 method Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- 238000004210 cathodic protection Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910000861 Mg alloy Inorganic materials 0.000 description 2
- 229910001297 Zn alloy Inorganic materials 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- GTKRFUAGOKINCA-UHFFFAOYSA-M chlorosilver;silver Chemical compound [Ag].[Ag]Cl GTKRFUAGOKINCA-UHFFFAOYSA-M 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000012085 test solution Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Landscapes
- Prevention Of Electric Corrosion (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は鉄鋼構造物の電気的防食に好適の流電陽極用ア
ルミニウム合金に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an aluminum alloy for galvanic anodes suitable for electrical corrosion protection of steel structures.
［従来の技術］
従来、海水中、海上中あるいは土中で使用される鉄鋼構
造物の防食法として、防食電流により鉄を腐食に対する
安定領域に保持する電気防食法が広く用いられている。[Prior Art] Conventionally, as a corrosion protection method for steel structures used in seawater, on the sea, or in the ground, cathodic protection methods have been widely used in which iron is maintained in a stable region against corrosion using an anticorrosion current.
この電気防食法には、例えば高シリコン鋼、白金などの
陽極電位の責な不溶性合金を陽極として用い、被防食体
を陰極としてこれを接続し、その中間に直流電源を配置
して強制的に通電させて防食電流を得る外部電源法と、
アルミニウム合金、亜鉛合金、マグネシウム合金などの
陽極電位の卑な合金を陽極として用い、陽極が腐食され
ることにより発生する余剰電子を防食電流として得る流
電陽極法の２種類がある。こ・のうち、外部電源法はそ
の設備が大規模となりやすく、また防食する期間中連続
して通電を行わなければならず、コストが高（つくため
通常は流電陽極法が多く用いられている。In this cathodic protection method, an insoluble alloy with a high anodic potential such as high silicon steel or platinum is used as an anode, the object to be protected is connected as a cathode, and a DC power source is placed between them to force the External power supply method to obtain anti-corrosion current by applying electricity,
There are two types of galvanic anode methods in which an alloy with a base anode potential, such as an aluminum alloy, a zinc alloy, or a magnesium alloy, is used as an anode, and surplus electrons generated by corrosion of the anode are obtained as a corrosion protection current. Among these methods, the external power supply method tends to require large-scale equipment, and it requires continuous energization during the corrosion protection period, resulting in high costs (current current anode method is usually used). There is.
このうちアルミニウム合金流電陽極は、マグネシウム合
金あるいは亜鉛合金と比較して単位重量当たり最も高い
発生電気量を示し、少ない重量で広範囲の被防食体であ
る鉄鋼構造物を防食出来ることから海水中あるいは海上
中で使用される船舶、鋼矢板、橋梁の基礎など腐食性の
高い環境において多く用いられている。Among these, aluminum alloy galvanic anodes generate the highest amount of electricity per unit weight compared to magnesium alloys or zinc alloys, and can protect a wide range of steel structures with a small weight, so they can be used in seawater or It is often used in highly corrosive environments such as ships used at sea, steel sheet piles, and bridge foundations.
［発明が解決しようとする課Ｍ］
このような従来のアルミニウム合金陽極としては、Ａｌ
にＺｎｓ Ｓｎｓ Ｉｎ５Ｚｎ−１ｎｓ Ｚｎ−５ｎｓ
Ｉｎ−５ｎ等さまざまの元素を各種の配合比率で添加
したものが提案または実用化されている。[Problem M to be solved by the invention] As such a conventional aluminum alloy anode, Al
Zns Sns In5Zn-1ns Zn-5ns
Products in which various elements such as In-5n are added at various blending ratios have been proposed or put into practical use.
流電陽極の特性値としては発注電気量、効率および陽極
電位が挙げられる。発生電気量とは単位重量あたりの防
食電気量のことであり、この値が大きいほど優れた陽極
であることを表している。Characteristic values of the galvanic anode include the amount of electricity to be ordered, efficiency, and anode potential. The amount of electricity generated is the amount of anti-corrosion electricity per unit weight, and the larger this value is, the better the anode is.
また同じ重量であれば値が大きいほど長期にわたり防食
電流を得られる、すなわち長寿命であるということを表
している。効率とはこの発生電気量と、合金の成分組成
によって決定される理論発生電気量（電気化学当量の逆
数であり、アルミニウムは２９ＢＯＡ−ｈｒ／ｋｇ、亜
鉛は８２０＾・ｂｒ／ｋｇ、またマグネシウムは２２０
５Ａ−ｈｒ／ｋｇである）との比であり、全発生電気量
の何％が防食電流として有効に作′用したかを表す数値
である。また、陽極電位とは合金の自然電位であり、鉄
の自然電位との差が大きいほど広範囲にわたり防食電流
を流すことが可能であることを示している。Furthermore, if the weight is the same, the larger the value, the longer the corrosion protection current can be obtained, that is, the longer the life. Efficiency is the amount of electricity generated and the theoretical amount of electricity (reciprocal of electrochemical equivalent) determined by the composition of the alloy; aluminum is 29 BOA-hr/kg, zinc is 820^br/kg, and magnesium is 220
5A-hr/kg), and is a numerical value representing what percentage of the total amount of electricity generated effectively acts as a corrosion protection current. Further, the anode potential is the natural potential of the alloy, and the larger the difference from the natural potential of iron, the more it is possible to flow the anti-corrosion current over a wider range.
上記の各種合金は効率が約８７〜８８％（発生電気量と
して２６００〜２６５０Ａ−ｈｒ／ｋｇ）といわれ、最
近の鉄鋼構造物の長寿命化を望む要求に対し十分でない
という問題点を有するものであった。The various alloys mentioned above are said to have an efficiency of about 87 to 88% (2,600 to 2,650 A-hr/kg of generated electricity), which has the problem of not being sufficient to meet the recent demands for longer lifespans of steel structures. Met.
本発明の目的は発生電気量が大きく、高効率、長寿命の
流を陽極用アルミニウム合金を提供することにある。An object of the present invention is to provide an aluminum alloy for anodes that generates a large amount of electricity, has high efficiency, and has a long life.
［課題を解決するための手段］
上記目的を達成するため本発明の合金は、ＺｎＯ０５〜
６、Ｉｎ０．０１〜０．０５、Ｓｉ０．０５〜０．３、
Ｔｉ ０．００５〜０．１、Ｂ ０．００１〜０．０２
、Ｃｅ０．０２〜０．２各重量％を含み、残部がアル
ミニウムと不可避不純物からなる点に特徴がある。[Means for Solving the Problems] In order to achieve the above object, the alloy of the present invention contains ZnO05~
6, In0.01-0.05, Si0.05-0.3,
Ti 0.005-0.1, B 0.001-0.02
, Ce and 0.02 to 0.2% by weight, with the remainder consisting of aluminum and unavoidable impurities.
［作 用］
以下に本発明合金の各成分組成範囲を上記の通りに限定
した理由について述べる。[Function] The reason why the composition range of each component of the alloy of the present invention is limited as described above will be described below.
Ｚｎは、ＡＩを主体とする合金において、Ａ１を活性に
する効果については、ＺｎはＩｎに比較すると小さいが
、ＩｎをＡｌ中に分散させる作用を有し、溶解表面を平
滑にするのに有効な作用をする。さらにＺｎはＡｎ合金
の水素過電圧を増大させる効果があり、平滑な溶解表面
を形成する効果とともに局部アノード、局部カソードの
形成による自己腐食を抑制し、発生電気量を増大させる
元素であるが、０．５重量％未満ではその効果が十分で
はなり、−方、６重量％を超えると陽極電位の資化を招
（のでその含有量を０．５〜６重量％とする必要がある
。Zn has a smaller effect on activating A1 in alloys mainly composed of AI than In, but it has the effect of dispersing In in Al and is effective in smoothing the melted surface. It has a certain effect. Furthermore, Zn has the effect of increasing the hydrogen overvoltage of the An alloy, and is an element that has the effect of forming a smooth melted surface, suppresses self-corrosion due to the formation of local anodes and local cathodes, and increases the amount of electricity generated. If it is less than .5% by weight, the effect will not be sufficient, and if it exceeds 6% by weight, the anodic potential will be utilized (therefore, the content needs to be 0.5 to 6% by weight).
ＩｎはＡ１合金を活性化し、陽極電位を大きく卑にする
作用を有するが、Ｚｎが０．５〜６重量％の範囲におい
て、Ｉｎが０．０１重量％未満ではその作用が十分では
なく、一方、０．０５重量％を超えると陽極電位は卑に
なるが、Ｉｎ自体不均一に分散し、そのために局部腐食
を生じて電気量が低下するのでその含有量を０．０１〜
０．０５重量％とする必要がある。In has the effect of activating the A1 alloy and greatly making the anode potential less noble, but in the range of 0.5 to 6% by weight of Zn, if In is less than 0.01% by weight, this effect is not sufficient; If the content exceeds 0.05% by weight, the anode potential becomes base, but In itself is non-uniformly dispersed, causing local corrosion and reducing the amount of electricity.
It needs to be 0.05% by weight.
Ｓｔは発生電気量を向上させるのに有効な元素であるが
、その含有量が０．０５重量％未満ではその作用が十分
ではなく、一方、０．３重量％を超えると陽極電位の資
化を招くのでその含有量を０．０５〜０．３重量％とす
る必要がある。St is an effective element for increasing the amount of electricity generated, but if its content is less than 0.05% by weight, its effect will not be sufficient, while if it exceeds 0.3% by weight, it will not be able to assimilate the anode potential. Therefore, the content needs to be 0.05 to 0.3% by weight.
Ｔｉ及びＢはＡｌｔ−Ｚｎ−Ｉｎ−Ｓｔ合金に添加され
る事によって結晶組織が粗大な柱状晶から微細な粒状晶
へと変化し、それにともなって合金の溶出が均一となり
、孔食、溝腐食並びに腐食生成物の付着を防止する。そ
の結果、溶解表面の均一性と平滑性が向上する。Ｔｉは
０．００５重量％未満、Ｂは０．００１重量％未満では
その効果は十分ではなく、Ｔｉは０．１重量％を超え、
Ｂは０．０２重量％を超えると発生電気量の低下を招く
のでその含有量をＴｉはｏ、ｏｏｓ〜０．１重量％、Ｂ
は０．００１〜０．０２重量％とする必要がある。By adding Ti and B to the Alt-Zn-In-St alloy, the crystal structure changes from coarse columnar crystals to fine granular crystals, and as a result, the elution of the alloy becomes uniform, causing pitting corrosion and groove corrosion. It also prevents the adhesion of corrosion products. As a result, the uniformity and smoothness of the melted surface is improved. If Ti is less than 0.005% by weight and B is less than 0.001% by weight, the effect is not sufficient, and if Ti exceeds 0.1% by weight,
If B exceeds 0.02% by weight, the amount of electricity generated will decrease, so the content should be adjusted to 0.1% by weight for Ti, and 0.1% by weight for B.
needs to be 0.001 to 0.02% by weight.
ＣｅはＡ１合金の孔食を防止し、結果として発生電気量
を増大させるのに有効な作用をする元素であるが、その
含有量が０．０２重量％未満ではその作用が十分ではな
く、一方、０．２重量％を超えると陽極電位の資化を招
くのでその含有量を０．０２〜０．２重量％とする必要
がある。Ce is an element that has an effective effect in preventing pitting corrosion of the A1 alloy and increasing the amount of electricity generated as a result, but if its content is less than 0.02% by weight, its effect is not sufficient; If it exceeds 0.2% by weight, the anodic potential will be assimilated, so the content needs to be 0.02 to 0.2% by weight.
［実施例］ 以下に実施例を示す。[Example] Examples are shown below.
第１表に示す組成で添加元素を配合し黒鉛ルツボを用い
て熔解し、直径２０■、長さ１５０日の丸棒状の金型に
鋳造して試験片とした。この試料を（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、実施した。略述すると、これ
らの試験片は鋳肌表面の酸化物の影響を除くために最終
的にサンドペーパーの２４０番の粗さになるまで表面を
研磨し、側面の供試面積４０ｄｌを残して他はビニール
テープを用いて絶縁被覆した。さらに人工海水に水酸化
マグネシウムを飽和させた液を１リツトルのビーカー内
に満たし、これを試験液とした。試験片は容器中央に配
置してこれを陽極とし、容器側壁に沿って配置したステ
ンレス円筒板を極間距離を３０鶴にとり陰極として、間
に直流安定化電源をはさんで結線した。これを陽極電流
密度１．０１１１Ａ／ＣＩＪの定電流条件で２４０時間
通電し、試験片の重量減から発生電気量を算出した。ま
た終了直前の陽極電位を銀−塩化銀電極を用いて測定し
飽和甘木電極基準値（Ｓ ＣＥ）に換算した。結果を第
１表に示す。Additive elements were blended with the composition shown in Table 1, melted in a graphite crucible, and cast into a round bar-shaped mold with a diameter of 20 cm and a length of 150 days to obtain a test piece. This sample was tested using the "galvanic anode test method" established by the Corrosion Prevention Association ("galvanic anode test method and explanation", Corrosion Technology, vol. 31, p. 612-62).
0.1982). Briefly, the surfaces of these test pieces were polished to the final roughness of 240-grit sandpaper to remove the influence of oxides on the surface of the cast surface, leaving a test area of 40 dl on the side surface. was insulated using vinyl tape. Furthermore, a 1-liter beaker was filled with a solution of artificial seawater saturated with magnesium hydroxide, and this was used as a test solution. The test piece was placed in the center of the container and used as an anode, and a stainless steel cylindrical plate placed along the side wall of the container was used as a cathode with a distance of 30 mm between the electrodes, and a stabilized DC power source was placed in between to connect the test piece. This was energized for 240 hours under constant current conditions with an anode current density of 1.0111 A/CIJ, and the amount of electricity generated was calculated from the weight loss of the test piece. In addition, the anode potential immediately before completion was measured using a silver-silver chloride electrode and converted to a saturated Amagi electrode standard value (SCE). The results are shown in Table 1.
第１表から本発明の合金はいずれも比較合金に比較して
一１０００ｍＶ （ｖｓ、５ＣＥ）以下の十分に卑な陽
極電位と２７５０〜２８０ＯＡ−ｈｒ／ｋｇと十分に高
い発生電気量を具備していることが分る。From Table 1, all of the alloys of the present invention have a sufficiently base anode potential of -11000 mV (vs. 5 CE) or less and a sufficiently high amount of generated electricity of 2750 to 280 OA-hr/kg compared to the comparative alloys. I can see that
［発明の効果］
本発明合金は、海水中あるいは海水中に設置された鉄鋼
構造物の電気防食に使用される場合、十分に卑な陽極電
位を有しながらかつ発生電気量２７５０〜２８００Ａ−
ｈｒ／ｋｇと合金の効率を従来の８７〜８８％から約９
４％にまで高めるものであり、長期間安定して使用され
得る超寿命の流電陽極を得ることができ、実用上顕著な
効果を発揮するものである。[Effects of the Invention] When the alloy of the present invention is used for cathodic protection of seawater or steel structures installed in seawater, it has a sufficiently base anode potential and generates an amount of electricity of 2750 to 2800 A-.
hr/kg and alloy efficiency from conventional 87-88% to approximately 9
4%, it is possible to obtain a long-life galvanic anode that can be stably used for a long period of time, and exhibits a remarkable practical effect.
特許出願人 住友金属鉱山株式会社Patent applicant: Sumitomo Metal Mining Co., Ltd.
Claims (1)
０．０５〜０．３、Ｔｉ０．００５〜０．１、Ｂ０．０
０１〜０．０２、Ｃｅ０．０２〜０．２各重量％を含み
、残部がアルミニウムと不可避不純物からなることを特
徴とする流電陽極用アルミニウム合金。(1) Zn0.5-6, In0.01-0.05, Si
0.05-0.3, Ti0.005-0.1, B0.0
An aluminum alloy for a galvanic anode, characterized in that it contains 0.01 to 0.02% by weight and 0.02 to 0.2% by weight of Ce, with the remainder consisting of aluminum and inevitable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27771390A JPH04157126A (en) | 1990-10-18 | 1990-10-18 | Aluminum alloy for calvanic anode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27771390A JPH04157126A (en) | 1990-10-18 | 1990-10-18 | Aluminum alloy for calvanic anode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04157126A true JPH04157126A (en) | 1992-05-29 |
Family
ID=17587282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27771390A Pending JPH04157126A (en) | 1990-10-18 | 1990-10-18 | Aluminum alloy for calvanic anode |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04157126A (en) |
-
1990
- 1990-10-18 JP JP27771390A patent/JPH04157126A/en active Pending
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