JPH02145736A - Copper alloy having excellent dezincification corrosion resistance - Google Patents
Copper alloy having excellent dezincification corrosion resistanceInfo
- Publication number
- JPH02145736A JPH02145736A JP29860488A JP29860488A JPH02145736A JP H02145736 A JPH02145736 A JP H02145736A JP 29860488 A JP29860488 A JP 29860488A JP 29860488 A JP29860488 A JP 29860488A JP H02145736 A JPH02145736 A JP H02145736A
- Authority
- JP
- Japan
- Prior art keywords
- corrosion resistance
- corrosion
- dezincification corrosion
- copper alloy
- erosion
- 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
- 230000007797 corrosion Effects 0.000 title claims abstract description 60
- 238000005260 corrosion Methods 0.000 title claims abstract description 60
- 229910000881 Cu alloy Inorganic materials 0.000 title claims abstract description 13
- 239000010949 copper Substances 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims description 2
- 239000000956 alloy Substances 0.000 abstract description 13
- 230000003628 erosive effect Effects 0.000 abstract description 13
- 229910045601 alloy Inorganic materials 0.000 abstract description 10
- 229910052802 copper Inorganic materials 0.000 abstract description 3
- 229910052759 nickel Inorganic materials 0.000 abstract description 3
- 229910052725 zinc Inorganic materials 0.000 abstract description 2
- 229910052785 arsenic Inorganic materials 0.000 abstract 1
- 239000000463 material Substances 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 7
- 229910052801 chlorine Inorganic materials 0.000 description 7
- 239000000460 chlorine Substances 0.000 description 7
- 150000003839 salts Chemical class 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 229910001369 Brass Inorganic materials 0.000 description 4
- 239000010951 brass Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 239000013505 freshwater Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000013535 sea water Substances 0.000 description 3
- 239000012085 test solution Substances 0.000 description 3
- 229910017518 Cu Zn Inorganic materials 0.000 description 2
- 229910017752 Cu-Zn Inorganic materials 0.000 description 2
- 229910017943 Cu—Zn Inorganic materials 0.000 description 2
- TVZPLCNGKSPOJA-UHFFFAOYSA-N copper zinc Chemical compound [Cu].[Zn] TVZPLCNGKSPOJA-UHFFFAOYSA-N 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000011253 protective coating Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000000645 desinfectant Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
Landscapes
- Conductive Materials (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、優れた耐脱亜鉛腐食性を有し、給水給湯用配
管、排水用配管並びに淡水及び海水の導水管用の材料と
して利用するのに適した耐脱亜鉛腐食性が優れた銅合金
に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention has excellent dezincification corrosion resistance and can be used as a material for water supply pipes, drainage pipes, and freshwater and seawater water conduit pipes. This invention relates to a copper alloy with excellent dezincification corrosion resistance suitable for
［従来の技術］
黄銅（例えば、Ｃ２７００）は、加工性、はんだ付は性
、ろう付は性及びめっき性等が優れているため、配管材
として多用されている。しかし、黄銅製配管を淡水又は
海水に暴露される用途で使用する場合は、脱亜鉛腐食が
問題となることがある。[Prior Art] Brass (for example, C2700) is widely used as a piping material because of its excellent workability, soldering properties, brazing properties, and plating properties. However, when brass piping is used in applications where it is exposed to freshwater or seawater, dezincification corrosion can become a problem.
従来、この脱亜鉛腐食を防止するためにＡｓを黄銅に添
加している。Conventionally, As is added to brass to prevent this dezincification corrosion.
［発明が解決しようとする課題］
しかしながら、近年、水質の劣化に伴い、腐食性塩類が
通流水中に濃縮したり、殺菌剤として注入している塩素
の使用量が増加する傾向にある。[Problems to be Solved by the Invention] However, in recent years, with the deterioration of water quality, there is a tendency for corrosive salts to concentrate in flowing water and for an increase in the amount of chlorine injected as a disinfectant.
このため、耐食性としては、耐脱亜鉛腐食性だけではな
く、全面腐食又は潰食等に対する防食性も考慮する必要
がある。しかしながら、従来のこの種の用途に使用され
る銅合金は耐全面腐食性及び耐潰食性については何ら考
慮されていないため、上述の塩素又は腐食性塩類の増加
には十分に対処することができないという問題点がある
。Therefore, as for corrosion resistance, it is necessary to consider not only dezincification corrosion resistance but also corrosion resistance against general corrosion or erosion corrosion. However, since the copper alloys conventionally used for this type of application do not have any consideration given to general corrosion resistance and crushing corrosion resistance, they cannot adequately cope with the increase in chlorine or corrosive salts mentioned above. There is a problem.
本発明はかかる問題点に鑑みてなされたものであって、
耐脱亜鉛腐食性は勿論のこと、耐全面腐食性及び耐潰食
性も優れた銅合金を提供することを目的とする。The present invention has been made in view of such problems, and includes:
The object of the present invention is to provide a copper alloy that has excellent not only dezincification corrosion resistance but also general corrosion resistance and crushing corrosion resistance.
［課題を解決するための手段］
本発明に係る耐脱亜鉛腐食性が優れた銅合金は、６０乃
至７０重１％のＣｕ及び０．００５乃至０．０６重量％
のＡｓを含有し、更に、Ｎｉ及び／又はＡＪを総量で０
．００５乃至０．５重量％だけ含有し、残部がＺｎ及び
不可避的不純物であることを特徴とする。[Means for Solving the Problems] The copper alloy having excellent dezincification corrosion resistance according to the present invention contains 60 to 70% by weight of Cu and 0.005 to 0.06% by weight.
of As, and further contains Ni and/or AJ in a total amount of 0.
．． 0.005 to 0.5% by weight, with the remainder being Zn and unavoidable impurities.
［作用−］
前述の如く、一般に黄Ｅ（Ｃｕ−Ｚｎ合金）の脱亜鉛腐
食を抑制する元素としてＡｓが知られている６通常の淡
水等が通流する配管である場合は、その配管用材料の黄
銅にＡｓのみを添加すれば十分実用上問題とならない程
度に脱亜鉛腐食を防止することができる。[Function] As mentioned above, As is generally known as an element that suppresses dezincification corrosion of yellow E (Cu-Zn alloy). If only As is added to the brass material, dezincification corrosion can be sufficiently prevented to an extent that does not pose a practical problem.
しかし、前述のように、塩素の使用量が増加した水質及
び腐食性塩類が濃縮した水質では、脱亜鉛腐食以外に全
面腐食又は潰食を受ける場合がある。However, as described above, in water conditions in which the amount of chlorine used has increased or in water conditions in which corrosive salts are concentrated, general corrosion or erosion may occur in addition to dezincification corrosion.
そこで、本願発明者等は、添加元素による全面腐食及び
潰食の防止効果について研究した結果、ＮＬ又はＡＪを
微量添加することによって、このような水質での使用に
おいて発生する全面腐食及び潰食に対する耐食性を向上
させることができることを見い出した。Therefore, as a result of research on the effect of additive elements on preventing general corrosion and erosion, the inventors of the present application found that by adding a small amount of NL or AJ, the overall corrosion and erosion that occur when used in such water conditions can be prevented. It has been found that corrosion resistance can be improved.
即ち、６０乃至７０重量％のＣｕを含有するＣｕ−Ｚｎ
合金中に、Ｎｉ又はＡＪを微量添加すると、水中でこの
合金材料の表面にＮｉ酸化物又はＡｌ酸化物の保護皮膜
が生成する。この保護皮膜によって、合金材料が腐食性
塩類及び塩素等の濃縮水による腐食から保護される。That is, Cu-Zn containing 60 to 70% by weight of Cu.
When a small amount of Ni or AJ is added to an alloy, a protective film of Ni oxide or Al oxide is formed on the surface of the alloy material in water. This protective coating protects the alloy material from corrosion by corrosive salts and concentrated water such as chlorine.
次に、本発明に係る耐脱亜鉛腐食性が優れた銅合金につ
いてその各成分の添加理由及び組成限定理由について説
明する。Next, the reason for adding each component and the reason for limiting the composition of the copper alloy having excellent dezincification corrosion resistance according to the present invention will be explained.
Ｎｉ又はＡｌ
Ｎｉ又はＡＪは配管を通流する水と反応してＮｉ酸化物
又はＡｆＩ酸化物の保護皮膜を生成する。Ni or Al Ni or AJ reacts with water flowing through the piping to form a protective coating of Ni oxide or AfI oxide.
この保護皮膜により全面腐食及び潰食を防止することが
できる。Ｎｉ若しくはＡＪの含有量又はＮｉ及びＡＪを
共に添加する場合はその総合有量が０．００５重景重量
満では全面腐食又は潰食を有効に抑制することができな
い。一方、Ｎｉ及び／又はＡ１の含有量が０．５重量％
を超えると、この銅合金材料を淡水で使用した場合に、
Ｎｉ又はＡＪの酸化スケールに起因した局部腐食が発生
し易くなる。This protective film can prevent general corrosion and erosion. If the content of Ni or AJ, or if Ni and AJ are added together, the total amount is less than 0.005, full-scale corrosion or erosion cannot be effectively suppressed. On the other hand, the content of Ni and/or A1 is 0.5% by weight
When this copper alloy material is used in fresh water,
Local corrosion due to Ni or AJ oxide scale is likely to occur.
従って、Ｎｉ又はＡＪの含有量は０．００５乃至０．５
重量％とする。なお、Ｎｉ及びＡ１を共に添加してもよ
く、この場合はその総合有量が前記範囲に入るようにす
る。Therefore, the content of Ni or AJ is 0.005 to 0.5
Weight%. Note that Ni and A1 may be added together, and in this case, the total amount thereof should be within the above range.
Ａｓ
Ａｓは銅合金の耐脱亜鉛腐食性を向上させる元素である
。Ａｓ含有量が０．００５重景重量満の場合は、脱亜鉛
腐食を有効的に抑制することができない、一方、ＡＳ＆
０．０６重量％を超えて添加しても、Ａｓによる耐脱亜
鉛腐食効果は飽和してしまい、添加コストが高くなるだ
けである。従って、Ａｓは０．００５乃至０．０６重量
％とする。As As is an element that improves the dezincification corrosion resistance of copper alloys. When the As content is less than 0.005, dezincification corrosion cannot be effectively suppressed.
Even if it is added in an amount exceeding 0.06% by weight, the dezincification corrosion resistance effect due to As will be saturated, and the addition cost will only increase. Therefore, the amount of As is 0.005 to 0.06% by weight.
Ｃｕ
この銅合金における主要な構成元素はＣｕとＺｎである
。この場合にＣｕ含有量が６０重量％未満では、β相の
比率が増加する。このβ相に対しては、Ａｓの添加によ
る脱亜鉛腐食抑制作用は十分な効果を発揮しない、一方
、Ｃｕ含有量が７０重量％以上になると、高価なＣｕの
含有量が増大するため、材料コストが高くなる。従って
、Ｃｕ含有量は６０乃至７０重量％とする。Cu The main constituent elements in this copper alloy are Cu and Zn. In this case, if the Cu content is less than 60% by weight, the ratio of β phase increases. For this β phase, the dezincification corrosion inhibiting effect by the addition of As does not have a sufficient effect. On the other hand, when the Cu content exceeds 70% by weight, the content of expensive Cu increases, so the material Cost increases. Therefore, the Cu content is set to 60 to 70% by weight.
［実施例コ
次に、本発明の実施例に係る銅合金について、その耐食
性を評価した結果を、比較例合金についての結果と比較
して説明する。通常の高周波電気炉を使用し、下記第１
表に示す成分組成を有する溶湯を調整した。そして、こ
の溶湯を金型に鋳造し、４ｋｇの板状の鋳塊を得た。こ
のようにして得られた鋳塊を面側した後、７５０℃の温
度に加熱して熱間圧延し、厚さが１０龍の板材とした。[Example 2] Next, the results of evaluating the corrosion resistance of copper alloys according to Examples of the present invention will be explained by comparing them with the results for Comparative Example alloys. Using a normal high frequency electric furnace,
A molten metal having the component composition shown in the table was prepared. This molten metal was then cast into a mold to obtain a 4 kg plate-shaped ingot. After the ingot thus obtained was side-faced, it was heated to a temperature of 750° C. and hot-rolled to obtain a plate material having a thickness of 10 mm.
その後。after that.
この板材を冷間圧延することにより、厚さが１■の薄板
を作製し、この薄板に対し４５０℃に３０分間加熱する
熱処理を行った。この熱処理後の薄板から試験材を作製
し、以下に示す各試験に供した。This plate material was cold rolled to produce a thin plate having a thickness of 1 inch, and this thin plate was heat-treated at 450° C. for 30 minutes. Test materials were prepared from the heat-treated thin plates and subjected to the following tests.
■耐脱亜鉛腐食性評価試験
供試材の耐脱亜鉛腐食性は、ｌ５Ｏ６５０９−１９８１
法に準拠した方法により試験した。即ち、ＣｕＣ，０２
・２Ｈ２０を１２．７ｇ／Ｊｌだけ含有する温水＜７５
°Ｃ）中に各試験材を２４時間浸漬した後、各試験材の
断面を観察して脱亜鉛腐食深さを測定した。■ Dezincification corrosion resistance evaluation test The dezincification corrosion resistance of the sample material is l5O6509-1981.
Tested in accordance with the law. That is, CuC,02
・Hot water containing 12.7g/Jl of 2H20<75
After each test material was immersed in 24 hours (°C), the cross section of each test material was observed to measure the depth of dezincification corrosion.
■耐全面腐食性評価試験
腐食性塩類及び塩素が濃縮した試験液を３５°Ｃに保持
し゛、この試験液中に試験材を４ケ月間浸漬して、腐食
減量（全面腐食減量）を求め、更に局部腐食の発生状況
について観察した。なお、この試験液の組成は上水中に
８０４２−を２００ｐｐｍ、 ＣＪ２−を２００ｐｐｍ
、残留塩素を２ ｐｐｍ含有させたものである。■ General corrosion resistance evaluation test A test solution containing concentrated corrosive salts and chlorine was maintained at 35°C, and the test material was immersed in this test solution for 4 months to determine the corrosion loss (overall corrosion loss). Furthermore, the occurrence of local corrosion was observed. The composition of this test solution was 200 ppm of 8042- and 200 ppm of CJ2- in tap water.
, containing 2 ppm of residual chlorine.
■耐潰食性評価試験
円板状の保持部材に供試材を固定し、これを上述の耐全
面腐食性評価、試験液と同一組成の試験液中に浸漬して
前記保持部材を５ｍ／秒の周速度で回転させた。このよ
うにして３０日間継続して回転浸漬試験した後の腐食減
量（潰食域ｉ）を求めた。■ Crushing corrosion resistance evaluation test A sample material is fixed to a disc-shaped holding member, and the material is immersed in a test liquid having the same composition as the general corrosion resistance evaluation described above, and the holding member is moved at a speed of 5 m/sec. It was rotated at a circumferential speed of . In this manner, the corrosion loss (erosion area i) was determined after the rotary immersion test continued for 30 days.
これらの各試験における測定結果を第１表に併わせて示
す。The measurement results for each of these tests are also shown in Table 1.
この第１表から明らかなように、本発明の特許請求の範
囲に入る実施例１乃至６の合金は、脱亜鉛腐食深さが浅
く、全面腐食減量及び潰食減量が少なく、局部腐食も発
生しなかった。As is clear from Table 1, the alloys of Examples 1 to 6, which fall within the scope of the claims of the present invention, have shallow dezincification corrosion depth, small general corrosion loss and erosion loss, and localized corrosion. I didn't.
これ、に対し１、比較例１の合金は、Ｎｉ及びＡＪの添
加量が少ないため、全面腐食及び潰食による腐食減量が
大きい、また、比較例２の合金は、Ａｓの添加量が少な
いため、脱亜鉛腐食深さが深い、更に、比較例３，４の
合金はＮｉ又はＡＪの添加量が多いため、孔食が発生し
た。On the other hand, 1. The alloy of Comparative Example 1 has a small amount of Ni and AJ added, so the corrosion loss due to general corrosion and erosion is large, and the alloy of Comparative Example 2 has a small amount of As added. The alloys of Comparative Examples 3 and 4 had a deep dezincification corrosion depth, and pitting corrosion occurred because the alloys of Comparative Examples 3 and 4 had a large amount of Ni or AJ added.
［発明の効果］
上述の如く本発明に係る銅合金は、耐脱亜鉛腐食性に加
え、耐全面腐食性及び耐潰食性も優れているので、淡水
又は海水用の配管材料としては勿論のこと、腐食性塩類
又は塩素が多い水質に使用される各種配管材料としても
極めて優れた耐食性能を発揮する。[Effects of the Invention] As mentioned above, the copper alloy according to the present invention has excellent general corrosion resistance and crushing corrosion resistance in addition to dezincification corrosion resistance, so it can of course be used as a piping material for freshwater or seawater. It also exhibits extremely excellent corrosion resistance as a piping material used in water containing a lot of corrosive salts or chlorine.
Claims (1)
．０６重量％のＡｓを含有し、更に、Ｎｉ及び／又はＡ
ｌを総量で０．００５乃至０．５重量％だけ含有し、残
部がＺｎ及び不可避的不純物であることを特徴とする耐
脱亜鉛腐食性が優れた銅合金。(1) 60-70% by weight of Cu and 0.005-0.
．． 06% by weight of As, and further contains Ni and/or A
1. A copper alloy having excellent dezincification corrosion resistance, characterized in that it contains 0.005 to 0.5% by weight of L in total, with the remainder being Zn and unavoidable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29860488A JPH02145736A (en) | 1988-11-25 | 1988-11-25 | Copper alloy having excellent dezincification corrosion resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29860488A JPH02145736A (en) | 1988-11-25 | 1988-11-25 | Copper alloy having excellent dezincification corrosion resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02145736A true JPH02145736A (en) | 1990-06-05 |
Family
ID=17861881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29860488A Pending JPH02145736A (en) | 1988-11-25 | 1988-11-25 | Copper alloy having excellent dezincification corrosion resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02145736A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5766377A (en) * | 1994-10-28 | 1998-06-16 | Wieland-Werke Ag | Copper-zinc-alloy for use in drinking-water installations |
| US5828022A (en) * | 1996-03-28 | 1998-10-27 | Niles Parts Co., Ltd. | Inhibitor switch device having an operating lever with a strength adjusting portion |
| US5828023A (en) * | 1996-03-28 | 1998-10-27 | Niles Parts Co., Ltd. | Inhibitor switch for detecting position of automobile automatic gear shifter including operating lever stoppers |
-
1988
- 1988-11-25 JP JP29860488A patent/JPH02145736A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5766377A (en) * | 1994-10-28 | 1998-06-16 | Wieland-Werke Ag | Copper-zinc-alloy for use in drinking-water installations |
| US5828022A (en) * | 1996-03-28 | 1998-10-27 | Niles Parts Co., Ltd. | Inhibitor switch device having an operating lever with a strength adjusting portion |
| US5828023A (en) * | 1996-03-28 | 1998-10-27 | Niles Parts Co., Ltd. | Inhibitor switch for detecting position of automobile automatic gear shifter including operating lever stoppers |
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