JPS6043455A - Corrosion-resistant beryllium alloy - Google Patents

Corrosion-resistant beryllium alloy

Info

Publication number
JPS6043455A
JPS6043455A JP14882483A JP14882483A JPS6043455A JP S6043455 A JPS6043455 A JP S6043455A JP 14882483 A JP14882483 A JP 14882483A JP 14882483 A JP14882483 A JP 14882483A JP S6043455 A JPS6043455 A JP S6043455A
Authority
JP
Japan
Prior art keywords
corrosion
alloy
beryllium
surface roughness
less
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
Application number
JP14882483A
Other languages
Japanese (ja)
Inventor
Yoshinori Kuwae
桑江 良昇
Kazuo Suzuki
一雄 鈴木
Akihiko Hoshiide
星出 明彦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP14882483A priority Critical patent/JPS6043455A/en
Publication of JPS6043455A publication Critical patent/JPS6043455A/en
Pending legal-status Critical Current

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  • Preventing Corrosion Or Incrustation Of Metals (AREA)

Abstract

PURPOSE:To obtain a corrosion-resistant Be alloy having superior resistance to nodular corrosion by specifying the surface roughness of a Be alloy. CONSTITUTION:The surface roughness Ra of a Be alloy is regulated to <=0.3mum. When the resulting Be alloy is used as metallic material requiring corrosion resistance such as a material for the inside of a nuclear reactor or a structural material for a chemical apparatus, the alloy shows superior performance for a long term and does not cause deterioration due to nodular corrosion. The amount of gaseous H2 produced is reduced, so the amount of gaseous H2 entering environment is reduced. The Be alloy having <=1.3mum surface roughness Ra can be easily manufactured by mechanical polishing and/or chemical polishing.

Description

【発明の詳細な説明】 〔発明の技術分野〕 本発明は水冷人IJ型原子炉の燃料核&管など耐食性を
要求される炉内材料として用いられる耐食ベリリウム基
合金に関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a corrosion-resistant beryllium-based alloy used as a reactor material that requires corrosion resistance, such as the fuel core and tubes of a water-cooled human IJ type nuclear reactor.

〔発明の技術的背景とその問題点〕[Technical background of the invention and its problems]

金属ベリリウムは比重が1.84でマグネシウムと殆ど
同じで必シ、アルミニウムの2.7.チタンの4.5よ
りはるか(二小さく、いわゆる軽金属の中でも軽い部類
に入いる。その上、比重4以下の他の元素が最高660
℃でとけてしまう中で、ベリリウムだけは1284℃と
いう高い融点をもち、それだけ耐熱性も匿れている。ま
た比熱が大きく、弾性係数が非常(ニーい。さら(ニベ
リリクムの原子核は高速中性子減速能が凝れている上(
二熱中性吸収断面積が小さく、かつ熱中性子敢乱断面積
が大きいので、原子炉の減速材9反射材など(=使用さ
れている。さらにγ脈照射を受けると中性子を発生する
ので、中性子鍬としても匣用されている。
Beryllium metal has a specific gravity of 1.84, which is almost the same as magnesium, and aluminum's specific gravity of 2.7. It is far (2) smaller than titanium's 4.5, and is among the lightest of the so-called light metals.Furthermore, other elements with a specific gravity of 4 or less have a maximum of 660
Among the materials that melt at ℃, only beryllium has a high melting point of 1284℃, making it that much more heat resistant. In addition, the specific heat is large and the elastic modulus is extremely high.
Because the bithermal neutral absorption cross section is small and the thermal neutron absorption cross section is large, it is used as a moderator in nuclear reactors. It is also used as a hoe.

上記のμ口く、ベリリウム (またはベリリウム基合金
)は機械的および核的性質ととも(二俊れているが、高
温水もしくは尚温水蒸気中での耐食性が必ずしも優れて
いるとは言い難く、このことがベリリウム基合金の普及
を妨げているきらいがあった。即ち、ベリリウム基合金
を高温間圧の水もしくは水蒸気中で使用すると、その匝
用時間の経過ととも艦=、いわゆるノジュラーコロージ
ョンと呼ばれる腐食反応(二よる白色腐食生成物が、そ
の衣面に斑点状(−生成してくるおそれがある。これは
ベリリウム基合金が高温水と反応し、生成された水素が
金属基材と表面の酸化膜との間(=蓄積して)vJ食主
生成物形成するものである。この腐食生成物は、経時的
(二光面(: 積し、ついには表面から剥離して、ベリ
リウム基合金の強度低下を招くおそれがある。
As mentioned above, beryllium (or beryllium-based alloys) has excellent mechanical and nuclear properties, but it is difficult to say that it has excellent corrosion resistance in high-temperature water or even hot steam. This has tended to hinder the widespread use of beryllium-based alloys.In other words, when beryllium-based alloys are used in water or steam at high temperature, as time passes, so-called nodular corrosion occurs. There is a possibility that a white corrosion product called a corrosion reaction (2) may be formed in spots on the coated surface. VJ corrosion products are formed between (accumulates) the oxide film on the surface.This corrosion product accumulates over time (accumulates) and eventually peels off from the surface, forming beryllium. This may lead to a decrease in the strength of the base alloy.

〔発明の目的〕[Purpose of the invention]

本発明は、かかる従米の問題点シニ鑑みなされたもので
、優れた耐ノジユラーコロ−ジョン性ヲ有する耐食ベリ
リウム基合金を提供するものである。
The present invention has been made in view of these problems, and provides a corrosion-resistant beryllium-based alloy having excellent nodular corrosion resistance.

〔発明のg要〕[Key points of invention]

本発明者等は、ベリリウム基合金の耐ノジユラーコロ−
ジョン性を改善するため、水蒸気環境下(二おける金に
14部材表面の腐食状態を研究したところ、ベリリウム
基合金の耐食性がベリリウム基合金表面の祖さと密接C
二関連することを見い出し、?I衣面の祖さRaが1.
3μm以下ではベリリウム基合金が優れた耐食性を示す
こと(二着目した。本発明はこの知見に基づいてなされ
たものである。
The present inventors have developed a method to improve the nodular roller resistance of beryllium-based alloys.
In order to improve the corrosion resistance, we researched the corrosion state of the surface of 14 parts in a water vapor environment (2000) and found that the corrosion resistance of beryllium-based alloys is closely related to that of beryllium-based alloy surfaces.
Find two related things,? The origin of the I-men mask is 1.
The second focus was on the fact that beryllium-based alloys exhibit excellent corrosion resistance below 3 μm. The present invention was made based on this knowledge.

即ち、ベリリウム基合金く二ついて表面粗さRa(mμ
)の異なる試験片(27aix20mix 3iII)
を用意し、500℃、 1071cg/cftO高濾高
圧水蒸気中でu時間の腐食試験を行った。上記試験条件
はノジュラーコロージョンの炉外加速試験の条件である
That is, the surface roughness Ra (mμ
) different test pieces (27aix20mix 3iII)
A corrosion test was conducted at 500°C in high-filtration, high-pressure steam at 1071 cg/cftO for u hours. The above test conditions are the conditions for an ex-core accelerated test of nodular corrosion.

第1図(二腐食試験結果を示す。第1図からRaが1.
3μm以下では腐食増量が極めて小さくなり、ノジュ2
−コロージョン(=よる白色腐食生成物の発生が見られ
ないこと。即ち、耐食性が飛躍的(−向上することが判
明した。ノジュラーコロージョンはベリリウム基合金母
材と酸化物皮膜との界面(=蓄積する水素ガスの圧力が
酸化物皮膜の耐圧を越えた時に酸化物皮膜破壊が起こる
こと(二より開始する。ベリリウム基合金の表面が徂れ
るほど、腐食速度が犬になる結果水素ガス圧力の上昇速
度が大きくなシ、かつ一様な酸化物ELMが形成され(
二くいため、酸化物皮膜の耐圧も小さくなる。ノジュ2
−コロージョンが発生するか否かのRaのしきい値が1
.3μm付近にあるものと推定される。
Figure 1 (shows the results of two corrosion tests. From Figure 1, Ra is 1.
At 3 μm or less, the increase in corrosion becomes extremely small, and nodules 2
-No occurrence of white corrosion products caused by corrosion (=).In other words, it was found that corrosion resistance was dramatically improved (-).Nodular corrosion is caused by the interface between the beryllium-based alloy base material and the oxide film Oxide film destruction occurs when the pressure of the accumulated hydrogen gas exceeds the withstand pressure of the oxide film (starting from step 2. The wider the surface of the beryllium-based alloy, the faster the corrosion rate becomes A uniform oxide ELM with a high rising speed is formed (
Because of this, the withstand voltage of the oxide film also decreases. Noju 2
-The Ra threshold for whether corrosion occurs is 1
.. It is estimated to be around 3 μm.

また、添加元素の並を重量%で鉄0.2チ以下、アルミ
ニウム0;1 %以下、クロム0.05%以下、ニッケ
ル6’、o5%以下としたのはこの範囲を超えると、R
aが1.3μm以下の場合でも、しばしばノジュ2−コ
ロージョンの発生が認められたからで、sる。
In addition, the addition elements were set to 0.2% iron or less, aluminum 0.1% or less, chromium 0.05% or less, nickel 6', o5% or less in terms of weight percent, because beyond this range, R
This is because even when a was 1.3 μm or less, occurrence of nodules corrosion was often observed.

〔発明の効果〕〔Effect of the invention〕

従って本発明に係るRa 1.3μm以下の表面粗さを
有するべIJ IJウム基合金を原子炉内材料あるいは
化学装置の構造材など耐食性を要求される金A4材料と
して用いた場合、長期口わたって優れた性能を発揮し、
ノジュ2−コロージョン1:よる劣化が起こらないこと
は明らかである。また、生成する水素ガスの量も少なく
なるため、水素ガスの環境への混入量も減る。
Therefore, when the aluminum-based alloy according to the present invention having a surface roughness of Ra 1.3 μm or less is used as a gold A4 material that requires corrosion resistance, such as a material inside a nuclear reactor or a structural material for chemical equipment, it will last for a long time. Demonstrates excellent performance,
No. 2 - Corrosion 1: It is clear that no deterioration occurs. Furthermore, since the amount of hydrogen gas generated is also reduced, the amount of hydrogen gas mixed into the environment is also reduced.

また本発明(=係るRa 1.3μm以下の表面粗さを
有するベリリウム基合金は機械研摩、化学研摩もしくは
両者の組み合わせにより容易ζ二製造できるという利点
をも有している。
Furthermore, the beryllium-based alloy having a surface roughness of Ra 1.3 μm or less according to the present invention also has the advantage that it can be easily manufactured by mechanical polishing, chemical polishing, or a combination of both.

〔発明の実施例〕[Embodiments of the invention]

以下、実施例を用いて本発明を説明するが、この実施例
は本発明を何ら制約するものではない。
The present invention will be explained below using examples, but these examples do not limit the present invention in any way.

市販のベリリウムホットプレスブロックから27關x2
0aiXa聾の試験片を用意し、600番の炭化ケイ素
で研摩したのち、リン酸、クロム酸、および硫酸を含む
水溶液中(二約ioo”cの温度で2分間振動しながら
浸漬した。浸漬後、水、エタノールで況浄して乾燥した
。得られた試料の表面粗さを測定するとRaは0.8μ
mであった。こうして得られた試販片を500℃、 1
07 jcglcr&の高温高圧水蒸気中でU時間のノ
ジュラーコロージョン試験を行なったところ、腐食増量
は18 mg/dm”であシ、白色腐食生成物の発生は
認められなかった。
27 mm x 2 from commercially available beryllium hot press block
A test piece of 0aiXa deafness was prepared, polished with No. 600 silicon carbide, and then immersed in an aqueous solution containing phosphoric acid, chromic acid, and sulfuric acid (at a temperature of about 2.00"C with vibration for 2 minutes. After immersion. , cleaned with water and ethanol, and dried.The surface roughness of the obtained sample was measured and found that Ra was 0.8μ.
It was m. The trial piece obtained in this way was heated to 500℃, 1
When a nodular corrosion test was conducted for U hours in high-temperature, high-pressure steam of No. 07 JCGLCR&, the corrosion weight increase was 18 mg/dm'', and no white corrosion products were observed.

以上の実施例から明らかなように本発明に係る1、3μ
m以下の表面粗さRa f有する耐食べIJ IJウム
基合金の製造方法は極めて簡単でかつその耐食性は極め
て優れている。
As is clear from the above examples, 1 and 3μ according to the present invention
Corrosion Resistant IJ IJ having a surface roughness Ra f of less than m The method for producing the IJ umium-based alloy is extremely simple and its corrosion resistance is extremely excellent.

以上の実施例では耐食ベリリウム(二ついて述べたが特
許請求の範囲第2項6二示す量のFe +Alなどを添
加元素とするベリリウム基合金(二ついても同様(二耐
ノジュラーコロージョン性が曖れた合金を得ることがで
きる。
In the above embodiments, corrosion-resistant beryllium (although two were mentioned, a beryllium-based alloy containing Fe + Al in the amount shown in claim 2, item 6, and the like) (the same applies even if there are two), It is possible to obtain an alloy that is

【図面の簡単な説明】[Brief explanation of drawings]

第1図は表面粗さRa(μm)と腐食増量ΔW/A(m
g/dm2)との関係を示す図である。 代理人 弁理士 則 近 窟 右(他1名)關昭60−
43455 (3) − 第1図 Rtt (−ttm)
Figure 1 shows surface roughness Ra (μm) and corrosion increase ΔW/A (m
g/dm2). Agent: Patent Attorney Nori Kon Kutsu (1 other person) Sekisho 60-
43455 (3) - Figure 1 Rtt (-ttm)

Claims (2)

【特許請求の範囲】[Claims] (1) ベリリウムの表面粗さRaが1,3μm以下で
必ることを特徴とする耐食ベリリウム基合金。
(1) A corrosion-resistant beryllium-based alloy characterized in that the surface roughness Ra of beryllium is 1.3 μm or less.
(2) ベリリウムが重i%で0.2チ以下の鉄、0.
1多以下のアルミニウム、0.05 %以下のクロム、
0.05チ以下のニッケルを甘み残部が実質的にベリリ
ウムから成ること全特徴とする特許請求の範囲第−項目
己載の耐食ベリリウム基合金。
(2) Iron containing 0.2% or less of beryllium, 0.
1 or less aluminum, 0.05% or less chromium,
A corrosion-resistant beryllium-based alloy according to claim 1, characterized in that the sweetened portion consists essentially of beryllium, containing less than 0.05 inches of nickel.
JP14882483A 1983-08-16 1983-08-16 Corrosion-resistant beryllium alloy Pending JPS6043455A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14882483A JPS6043455A (en) 1983-08-16 1983-08-16 Corrosion-resistant beryllium alloy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14882483A JPS6043455A (en) 1983-08-16 1983-08-16 Corrosion-resistant beryllium alloy

Publications (1)

Publication Number Publication Date
JPS6043455A true JPS6043455A (en) 1985-03-08

Family

ID=15461541

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14882483A Pending JPS6043455A (en) 1983-08-16 1983-08-16 Corrosion-resistant beryllium alloy

Country Status (1)

Country Link
JP (1) JPS6043455A (en)

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