JPH10219474A - Corrosion inhibiting method using mixed metal powder - Google Patents
Corrosion inhibiting method using mixed metal powderInfo
- Publication number
- JPH10219474A JPH10219474A JP2258097A JP2258097A JPH10219474A JP H10219474 A JPH10219474 A JP H10219474A JP 2258097 A JP2258097 A JP 2258097A JP 2258097 A JP2258097 A JP 2258097A JP H10219474 A JPH10219474 A JP H10219474A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- metal powder
- mixed metal
- mixed
- coating layer
- 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.)
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Links
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- Other Surface Treatments For Metallic Materials (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は被処理材、例えば炭
素鋼、ステンレス鋼などのＦｅ基合金、Ｎｉ基合金材料
など、の表面に防食被膜を形成させる方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming an anticorrosion film on the surface of a material to be treated, for example, an Fe-based alloy such as carbon steel or stainless steel, or a Ni-based alloy material.
【０００２】[0002]
【従来の技術】従来、防食などを目的としたＦｅ基合
金、Ｎｉ基合金材料などの表面被覆は溶射、メッキ、肉
盛溶接などが採用されているが、溶射やメッキでは被覆
層に生じる欠陥が問題となることがあり、また肉盛溶接
は工数がかかるとともに局部的に高温となることから変
形が問題となることがあった。なお溶射においては、欠
陥防止のため、自溶性合金を用いることがあるが、組成
が限定されることから耐食性などの特性が十分得られな
い場合もあった。2. Description of the Related Art Conventionally, thermal spraying, plating, build-up welding, etc., have been employed for surface coating of Fe-based alloys, Ni-based alloy materials, etc. for the purpose of corrosion prevention and the like. May be a problem, and the build-up welding may require a lot of man-hours and may be deformed due to local high temperature. In the thermal spraying, a self-fluxing alloy is used in some cases to prevent defects. However, due to a limited composition, characteristics such as corrosion resistance may not be sufficiently obtained in some cases.
【０００３】[0003]
【発明が解決しようとする課題】本発明は上記技術水準
に鑑み、比較的低エネルギでＦｅ基合金、Ｎｉ基合金材
料などの被処理材の表面に優れた防食性被膜を形成する
方法を提供しようとするものである。SUMMARY OF THE INVENTION In view of the above technical problems, the present invention provides a method for forming an excellent anticorrosion coating on the surface of a material to be treated such as an Fe-based alloy or a Ni-based alloy material with relatively low energy. What you want to do.
【０００４】[0004]
【課題を解決するための手段】金属間化合物には耐食性
が優れるものがあり、防食用材料として有用であるが一
般に靱性が低く、また融点が高いことから、そのままで
は使用し難い。そこで、本発明は原料となる金属粉末か
ら金属間化合物が形成される際に大きな反応熱をもつ場
合が多いことに着目し、取扱いが容易な金属粉末を金属
間化合物組成あるいはそれに近い組成に所定量混合し、
該混合粉末を被処理材、例えば炭素鋼、ステンレス鋼な
どのＦｅ基合金、Ｎｉ基合金材料の表面に塗布した後、
昇温することで自らの反応熱により比較的低温で反応を
生じさせ、被処理材の表面に防食性のある金属間化合物
の被覆層を形成させようとするものである。SUMMARY OF THE INVENTION Some intermetallic compounds have excellent corrosion resistance and are useful as anticorrosion materials, but are generally difficult to use as they are because of their low toughness and high melting point. Accordingly, the present invention focuses on the fact that an intermetallic compound is often formed with a large heat of reaction when a metal powder as a raw material is formed. Quantitatively mixed,
After applying the mixed powder to the surface of a material to be processed, for example, Fe-based alloy such as carbon steel or stainless steel, or Ni-based alloy material,
By raising the temperature, a reaction is caused at a relatively low temperature by its own reaction heat, and a coating layer of an intermetallic compound having corrosion resistance is formed on the surface of the material to be treated.
【０００５】すなわち、本発明は被処理材の表面に、反
応して金属間化合物を形成する混合金属粉末を金属間化
合物組成近傍の割合に混合したものを塗布した後、該混
合金属粉末の反応溶融が生じる温度に加熱することを特
徴とする混合金属粉末を用いた防食表面被覆法であり、
好ましい実施態様例としては前記混合金属粉末がモル比
で３：１で混合したＮｉ粉末とＡｌ粉末よりなり、該混
合金属粉末を被処理材に塗布後の加熱温度を６００〜７
００℃にし、被処理材表面にＮｉ3 Ａｌ金属間化合物の
被覆層を形成させる方法があげられる。上記具体例以外
にも、モル比で１：１近傍のＴｉ粉末とＡｌ粉末、Ｆｅ
粉末とＡｌ粉末を用いることも可能である。That is, according to the present invention, a mixed metal powder which reacts to form an intermetallic compound is applied to the surface of a material to be treated and mixed at a ratio close to the composition of the intermetallic compound. An anticorrosion surface coating method using a mixed metal powder characterized by heating to a temperature at which melting occurs,
In a preferred embodiment, the mixed metal powder is composed of Ni powder and Al powder mixed at a molar ratio of 3: 1.
The temperature may be set to 00 ° C. to form a coating layer of Ni 3 Al intermetallic compound on the surface of the material to be treated. In addition to the above specific examples, Ti powder and Al powder in a molar ratio of about 1: 1 and Fe powder
It is also possible to use powder and Al powder.
【０００６】[0006]
【発明の実施の形態】例えば防食被覆層としてＮｉ3 Ａ
ｌ金属間化合物を例に採ると、ＮｉとＡｌをモル比で
３：１の比で混合した、混合金属粉末を炭素鋼やステン
レス鋼製の管等の表面被覆を実施しようとするものの表
面に塗布し、この混合金属粉末を昇温する。この時、金
属間化合物Ｎｉ3 Ａｌであれば１７００℃以上の融点を
もつにもかかわらず、金属粉を混合した場合であれば自
身の反応熱により６００〜７００℃程度まで昇温すると
反応溶融が生じる。BEST MODE FOR CARRYING OUT THE INVENTION For example, Ni 3 A is used as an anticorrosion coating layer.
1 Taking an intermetallic compound as an example, a mixed metal powder obtained by mixing Ni and Al at a molar ratio of 3: 1 is applied to the surface of a carbon steel or stainless steel tube or the like whose surface is to be coated. Then, the temperature of the mixed metal powder is increased. At this time, although the intermetallic compound Ni 3 Al has a melting point of 1700 ° C. or more, if the metal powder is mixed, the reaction melting will occur if the temperature is raised to about 600 to 700 ° C. by the reaction heat of its own. Occurs.
【０００７】通常の溶射などでは形成された被覆層には
欠陥（気孔）があり、この欠陥を介して腐食性物質が被
処理材に接するので防食効果が十分でないが、本発明に
おいて形成される被覆層は一旦溶融状態を経由している
ので、溶射などで形成される被覆層のような欠陥を生じ
ないので、防食を目的とした被覆層としては極めて有用
である。[0007] The coating layer formed by ordinary thermal spraying or the like has defects (pores), and the corrosive substance comes into contact with the material to be processed through these defects, so that the corrosion prevention effect is not sufficient. Since the coating layer once passes through a molten state, it does not cause defects such as a coating layer formed by thermal spraying or the like, and is therefore extremely useful as a coating layer for corrosion protection.
【０００８】本発明における防食被覆層は完全な金属間
化合物である必要はなく、金属間化合物が形成されてい
ればよいので、金属間化合物を形成する金属粉末の混合
比は厳密に金属間化合物の化学量論的量である必要はな
い。また、金属粉末は金属間化合物を容易に形成するよ
うに細粒である必要があるが、余り細かいと金属粉末自
体が酸化して防食被覆層を劣化するので、平均粒径５０
μｍ（この粒度は溶射などで使用される範囲のもの）程
度であることが好ましい。The anticorrosion coating layer according to the present invention does not need to be a complete intermetallic compound, and it is sufficient that the intermetallic compound is formed. Therefore, the mixing ratio of the metal powder forming the intermetallic compound is strictly defined. Need not be stoichiometric. Further, the metal powder needs to be fine particles to easily form an intermetallic compound, but if it is too fine, the metal powder itself oxidizes and deteriorates the anticorrosion coating layer.
It is preferably about μm (the particle size is in a range used for thermal spraying or the like).
【０００９】[0009]
【実施例】以下、具体的な実施例をあげ、本発明の効果
を明らかにする。粒度５０μｍ程度のＮｉ粉及びＡｌ粉
をモル比で３：１に混合した後、縦：２００ｍｍ、横：
２００ｍｍ、厚さ：３ｍｍの炭素鋼（ＳＳ４００）の表
面に縦：１００ｍｍ×横１００ｍｍの範囲で混合粉末を
厚さ：３ｍｍに塗布し、７００℃×１０分の熱処理を行
い、炭素鋼表面に金属間化合物の表面被覆層を形成し
た。このサンプルを縦：１５ｍｍ×横：１５ｍｍのサイ
ズ（厚さは概ね６ｍｍ）に切断し、表面被膜面以外を有
機系材料を塗布することでカバーした。同様のサンプル
を炭素鋼についても製作し、６５％硝酸中に２４時間浸
漬した。その結果炭素鋼の浸漬前後の減肉量は５０ｍｇ
であったが、金属間化合物Ｎｉ3 Ａｌで表面被覆した材
料では０．１ｍｇ以下で優れた耐食性を示した。EXAMPLES Hereinafter, the effects of the present invention will be clarified by giving specific examples. After mixing Ni powder and Al powder having a particle size of about 50 μm at a molar ratio of 3: 1, the length: 200 mm, the width:
A mixed powder having a thickness of 3 mm is applied to a surface of carbon steel (SS400) having a thickness of 200 mm and a thickness of 3 mm in a range of length: 100 mm × width 100 mm, and heat treatment is performed at 700 ° C. for 10 minutes to form a metal on the surface of the carbon steel. A surface coating layer of the inter-compound was formed. This sample was cut into a size of 15 mm (length) × 15 mm (width) (the thickness was approximately 6 mm), and the surface except for the surface coating was covered by applying an organic material. A similar sample was prepared for carbon steel and immersed in 65% nitric acid for 24 hours. As a result, the amount of wall loss before and after immersion of carbon steel was 50 mg.
However, the material coated with the intermetallic compound Ni 3 Al exhibited excellent corrosion resistance at 0.1 mg or less.
【００１０】[0010]
【発明の効果】本発明により欠陥の少ない耐食性等の優
れる表面被覆法が提供できる。According to the present invention, it is possible to provide a surface coating method with few defects and excellent corrosion resistance.
フロントページの続き (72)発明者 土井 祐一 長崎県長崎市深堀町五丁目717番地１ 長 菱エンジニアリング株式会社内Continuation of front page (72) Inventor Yuichi Doi 5-717-1, Fukahori-cho, Nagasaki-shi, Nagasaki Nagasaki Engineering Co., Ltd.
Claims (2)
物を形成する混合金属粉末を金属間化合物組成近傍の割
合に混合したものを塗布した後、該混合金属粉末の反応
溶融が生じる温度に加熱することを特徴とする混合金属
粉末を用いた防食表面被覆法。After applying a mixed metal powder which reacts to form an intermetallic compound at a ratio near the intermetallic compound composition on the surface of a material to be treated, the mixed metal powder reacts and melts. An anticorrosion surface coating method using a mixed metal powder characterized by heating to a temperature.
をモル比で３：１で混合したものであり、該混合金属粉
末を塗布後の加熱温度が６００〜７００℃であることを
特徴とする請求項１記載の防食表面被覆法。2. The method according to claim 1, wherein the mixed metal powder is obtained by mixing Ni powder: Al powder at a molar ratio of 3: 1, and a heating temperature after application of the mixed metal powder is 600 to 700 ° C. The anticorrosion surface coating method according to claim 1,
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02258097A JP3389036B2 (en) | 1997-02-05 | 1997-02-05 | Anticorrosion coating method using mixed metal powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02258097A JP3389036B2 (en) | 1997-02-05 | 1997-02-05 | Anticorrosion coating method using mixed metal powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10219474A true JPH10219474A (en) | 1998-08-18 |
| JP3389036B2 JP3389036B2 (en) | 2003-03-24 |
Family
ID=12086808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02258097A Expired - Fee Related JP3389036B2 (en) | 1997-02-05 | 1997-02-05 | Anticorrosion coating method using mixed metal powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3389036B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006129608A1 (en) * | 2005-06-01 | 2006-12-07 | Honda Motor Co., Ltd. | Die reinforcing method and die repairing method |
| JP2008240057A (en) * | 2007-03-27 | 2008-10-09 | Mitsubishi Materials Corp | Fluid paste for preventing sulfurization of silver clay sintered compact |
-
1997
- 1997-02-05 JP JP02258097A patent/JP3389036B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006129608A1 (en) * | 2005-06-01 | 2006-12-07 | Honda Motor Co., Ltd. | Die reinforcing method and die repairing method |
| US8337639B2 (en) | 2005-06-01 | 2012-12-25 | Honda Motor Co., Ltd. | Die reinforcing method and die repairing method |
| JP2008240057A (en) * | 2007-03-27 | 2008-10-09 | Mitsubishi Materials Corp | Fluid paste for preventing sulfurization of silver clay sintered compact |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3389036B2 (en) | 2003-03-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20021203 |
|
| LAPS | Cancellation because of no payment of annual fees |