JPH03243792A - Formation of chromium coating - Google Patents
Formation of chromium coatingInfo
- Publication number
- JPH03243792A JPH03243792A JP2039773A JP3977390A JPH03243792A JP H03243792 A JPH03243792 A JP H03243792A JP 2039773 A JP2039773 A JP 2039773A JP 3977390 A JP3977390 A JP 3977390A JP H03243792 A JPH03243792 A JP H03243792A
- Authority
- JP
- Japan
- Prior art keywords
- chromium
- coating
- steel
- layer
- welding
- 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
- 239000011248 coating agent Substances 0.000 title claims abstract description 33
- 238000000576 coating method Methods 0.000 title claims abstract description 33
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 title claims description 41
- 229910052804 chromium Inorganic materials 0.000 title claims description 37
- 239000011651 chromium Substances 0.000 title claims description 37
- 230000015572 biosynthetic process Effects 0.000 title description 2
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 13
- 239000010959 steel Substances 0.000 claims abstract description 13
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 8
- 239000000956 alloy Substances 0.000 claims abstract description 8
- 238000009713 electroplating Methods 0.000 claims abstract description 6
- 230000001678 irradiating effect Effects 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 20
- 238000005260 corrosion Methods 0.000 abstract description 12
- 230000007797 corrosion Effects 0.000 abstract description 12
- 238000003466 welding Methods 0.000 abstract description 9
- 239000010410 layer Substances 0.000 abstract description 8
- 238000007747 plating Methods 0.000 abstract description 8
- 238000005336 cracking Methods 0.000 abstract description 5
- 239000002344 surface layer Substances 0.000 abstract description 3
- 239000011247 coating layer Substances 0.000 abstract description 2
- UFGZSIPAQKLCGR-UHFFFAOYSA-N chromium carbide Chemical compound [Cr]#C[Cr]C#[Cr] UFGZSIPAQKLCGR-UHFFFAOYSA-N 0.000 description 5
- 229910003470 tongbaite Inorganic materials 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000000586 desensitisation Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 206010070834 Sensitisation Diseases 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は、鉄鋼系材料表面へのクロム被覆の形成方法に
関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method for forming a chromium coating on the surface of a steel-based material.
（従来の技術）
鉄鋼材料の表面の耐食性や耐摩耗性を上げるために、従
来から電気めっき、蒸着法や溶射法などでクロム系金属
の被膜が形成されている。(Prior Art) In order to improve the corrosion resistance and wear resistance of the surface of steel materials, a chromium-based metal coating has been conventionally formed by electroplating, vapor deposition, thermal spraying, or the like.
ところが、このうち、電気めっきで形成されたクロム被
膜は、他の方法よりも膜質はすぐれているが、一方では
被膜内にピンホールや亀裂が残りやすく、もしそれらが
被膜の貫通方向に連通ずると、外気の影響で地金が侵さ
れるおそれがある。However, although the chrome film formed by electroplating has better film quality than other methods, it also tends to leave pinholes and cracks in the film, and if they are connected in the direction of penetration of the film, There is a risk that the metal will be attacked by the outside air.
ところで、例えばオーステナイト系ステンレス鋼の溶接
で製造された配管継手のように、溶接による熱で内部に
クロム炭化物を生成し鋭敏化された熱影響域が生成した
部品では、基材中に析出された炭化物を拡散させるため
に、高温熱処理による脱鋭敏化処理が施される。By the way, in parts such as pipe fittings manufactured by welding austenitic stainless steel, where heat from welding produces chromium carbide inside and creates a sensitized heat-affected zone, chromium carbide is precipitated in the base material. In order to diffuse the carbides, a desensitization treatment is performed using high temperature heat treatment.
（発明が解決しようとする課題）
ところが、この脱鋭敏化処理は、工程が複雑なだけでな
く、高温加熱で母材が歪むおそれがあるので１組立のた
めの嵌合部や螺合部に高精度が要求され長期に亘って水
密が要求される配管部品などには使えない。(Problem to be solved by the invention) However, this desensitization process not only requires a complicated process, but also has the risk of distorting the base material due to high temperature heating, so it is difficult to apply it to the fitting or threaded parts for one assembly. It cannot be used for piping parts that require high precision and watertightness over a long period of time.
又、もし、歪みを防ぐために脱鋭敏化処理を省くと１組
立後に振動を受ける部品では、応力腐食割れが起きるお
それがある。Also, if desensitization is omitted to prevent distortion, stress corrosion cracking may occur in parts that are subjected to vibration after one assembly.
そこで、本発明の目的は、鉄鋼の母材を変形させること
なく、表面の耐食性を上げることのできるクロム被覆の
形成方法を得ることである。Therefore, an object of the present invention is to provide a method for forming a chromium coating that can improve the corrosion resistance of the surface without deforming the steel base material.
（課題を解決するための手段）
本発明は、鉄鋼材の母材の熱影響部の外面にクロム又は
クロム系合金の被覆を電気めっきで形成するクロム被覆
の形成方法において、熱影響部の外面に形成されたクロ
ム又はクロム系合金の被覆にレーザ光を照射して、上記
被覆を溶融し母材に溶着したことを特徴とするクロム被
覆の形成方法である。(Means for Solving the Problems) The present invention provides a method for forming a chromium coating, in which a coating of chromium or a chromium-based alloy is formed on the outer surface of a heat affected zone of a base material of a steel material by electroplating. This method of forming a chromium coating is characterized in that the coating of chromium or chromium-based alloy formed on the substrate is irradiated with a laser beam to melt the coating and weld it to the base material.
（作 用） この方法で得られたクロム被覆の表面層には。(for production) In the surface layer of the chromium coating obtained by this method.
耐食性にすぐれた緻密な溶融凝固層が一様に形成される
とともに、母材表面を一部溶融し各成分が拡散して、極
めて密着性にすぐれたクロム被覆層となる。とくに溶接
接合されたオーステナイト系ステンレス鋼の熱影響域に
施されたときでも、表面に析出したクロム炭化物を分解
させた溶体化層の形成で、流水に接し震動がかかる場所
に設置されても応力腐食割れを防ぐことのできるクロム
被覆となる。A dense molten solidified layer with excellent corrosion resistance is uniformly formed, and the surface of the base material is partially melted and each component is diffused, resulting in a chromium coating layer with extremely excellent adhesion. In particular, even when applied to the heat-affected zone of welded austenitic stainless steel, the formation of a solution layer that decomposes the chromium carbide precipitated on the surface reduces stress even when installed in a location exposed to running water and subject to vibrations. It becomes a chrome coating that can prevent corrosion cracking.
（実施例） 以下、本発明の一実施例を図面を参照して説明する。(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
第１図において、母材ｌは左右の鉄鋼板材が溶接肉盛部
２で溶接され、この肉盛部２の外側に熱影響域３が残り
、この熱影響域３の上面にその周りに電気めっきのうち
の部分めっきで用途によって５０〜３００ｍの厚さのク
ロムめっき層を形成したものである。In Fig. 1, the base material l is made by welding left and right steel plates at a weld build-up area 2, and a heat-affected zone 3 remains outside of this build-up area 2. Partial plating is used to form a chromium plating layer with a thickness of 50 to 300 m depending on the application.
本発明のクロム被覆の形成方法では、このように鉄鋼材
料の溶接部などの熱影響域３の耐食性が要求される側の
面に形成されたクロム被覆４に対して、第２図に示すよ
うにレーザ光（例えば炭酸ガスレーザ）５を矢印５ａ方
向に照射してクロム被［４を溶融して後述するように更
に耐食性のすぐれたクロム被覆６を形成する。In the method for forming a chromium coating of the present invention, as shown in FIG. A laser beam (for example, a carbon dioxide laser) 5 is irradiated in the direction of the arrow 5a to melt the chromium coating [4] and form a chromium coating 6 with further excellent corrosion resistance as described later.
するとこのとき、溶融したクロム被覆の熱で加熱された
母材１の表層近傍には溶接で析出されたクロム炭化物が
分解された溶体化域７が同図に示すように形成される。At this time, a solution region 7 in which chromium carbide precipitated during welding is decomposed is formed near the surface layer of the base material 1 heated by the heat of the melted chromium coating, as shown in the figure.
第３図は、上記クロム被覆の形成方法を、オーステナイ
ト系ステンレス鋼材のＴ形継手の溶接接合部１４に適用
した事例を示す部分断面図である。FIG. 3 is a partial cross-sectional view showing an example in which the method for forming a chromium coating is applied to a welded joint 14 of a T-shaped joint made of austenitic stainless steel.
発明者らは、大口径の管１３と小口径の管１２とが隅肉
溶接された環状の溶接部が形成されたＴ形継手に対し、
管１２の内面を洗滌の後、熱影響部となる部分に対して
２００μの厚さでクロムめっきを施した後、レーザ光１
６を照射して第２図で前述したようなりロム被覆１５を
形成した。The inventors have developed a T-shaped joint in which a ring-shaped welded portion is formed by fillet-welding a large-diameter pipe 13 and a small-diameter pipe 12,
After cleaning the inner surface of the tube 12, chromium plating is applied to the part that will become the heat affected zone to a thickness of 200μ, and then the laser beam 1 is applied.
6 to form a ROM coating 15 as described above in FIG.
レーザ光１６は、炭酸ガスレーザ２ｋＷ、横モードは定
形共振器から出射されたマルチモードで、焦点はずし法
で焦点径１０ｗｍ、加工速度は０．５ｍ／＋ｍｉｎであ
る。なお、アシストガスはアルゴンを用いた。The laser beam 16 is a carbon dioxide gas laser of 2 kW, the transverse mode is a multi-mode emitted from a regular resonator, the focal diameter is 10 wm by the defocus method, and the processing speed is 0.5 m/+min. Note that argon was used as the assist gas.
このようにしてクロム被覆が形成されたＴ形継手におい
ては、例えば加熱炉による高温度の脱鋭敏化熱処理を行
ったものに比べて、接続される相手との接続部の熱歪を
防ぐことができるので、長期に亘って応力腐食割れを防
ぐことのできるＴ形継手となるだけでなく、設備の増設
や仕様の変更に対してもレーザ加工機の搬入で現地で処
理できるので１発電プラント設備などのライン変更・増
設にも容易に対応することができる。T-shaped joints with a chromium coating formed in this way are more effective in preventing thermal strain at the connection to the other party than those that have been subjected to high-temperature de-sensitization heat treatment using a heating furnace, for example. This not only creates a T-shaped joint that can prevent stress corrosion cracking over a long period of time, but also allows equipment expansion or specification changes to be processed on-site by bringing in a laser processing machine. It can easily accommodate line changes and expansions such as
第４図は１本発明のクロム被覆の形成方法の他の実施例
を示す図である。FIG. 4 is a diagram showing another embodiment of the method for forming a chromium coating according to the present invention.
本実施例では、大径の管１７と小径の管１８の溶接部１
９の外側表面にクロムめっき２０を施した後、外側から
矢印２１方向にレーザ光を照射して上述の熱影響部の応
力腐食割れを緩和したものである。In this embodiment, the welded portion 1 of the large-diameter pipe 17 and the small-diameter pipe 18 is
After chromium plating 20 is applied to the outer surface of 9, laser light is irradiated from the outside in the direction of arrow 21 to alleviate stress corrosion cracking in the heat affected zone.
この場合には、Ｔ形又は十字形の交点で形成される切欠
き係数による機械的応力だけがとくに大きいときなどに
とくに効果がある利点がある。In this case, there is an advantage that it is particularly effective when only the mechanical stress due to the notch coefficient formed at the intersection of the T shape or the cross shape is particularly large.
なお、上記実施例では、母材としてオーステナイト系ス
テンレス鋼のときで説明したが、鋳鋼品、炭素鋼管など
でもよく、又、内部に水が流れる管状部品だけでなく、
屋外に設置された支持材でもよい。In the above embodiments, the base material is austenitic stainless steel, but cast steel products, carbon steel pipes, etc. may also be used, and not only tubular parts through which water flows, but also
Supports installed outdoors may also be used.
更に、上記実施例においては、被覆材はクロムとしたが
、クロムを主体としたものであれば、ニッケル、鉄など
を配合したものでもよい。Further, in the above embodiments, the coating material was made of chromium, but as long as it is made mainly of chromium, it may be made of nickel, iron, or the like.
以上、本発明によれば、鉄鋼材の熱影響部にクロム又は
クロム系合金の被覆を電気めっきで形成するクロム被覆
の形成方法において、熱影響部の片面又は両面に形成さ
れたクロム又はクロム系合金の被覆にレーザ光を照射す
ることで、基材に析出されたクロム炭化物を分解して溶
体化したので、母材を変形させることなく、表面の耐食
性を上げることのできるクロム被覆の形成方法を得るこ
とができる。４、図面の簡単な説明
第１図と第２図は本発明のクロム被覆の形成方法の一実
施例を示す図で、第１図は前工程を示す部分断面図、第
２図は後工程を示す部分断面図。As described above, according to the present invention, in the method for forming a chromium coating in which a coating of chromium or a chromium-based alloy is formed on a heat-affected zone of a steel material by electroplating, By irradiating the alloy coating with laser light, the chromium carbide precipitated on the base material is decomposed and converted into a solution, so this method can improve the corrosion resistance of the surface without deforming the base material. can be obtained. 4. Brief description of the drawings Figures 1 and 2 are diagrams showing an embodiment of the method for forming a chromium coating according to the present invention. FIG.
第３図は本発明のクロム被覆の形成方法の実施例を示す
部分断面図、第４図は本発明のクロム被覆の形成方法の
他の実施例を示す部分外観図である。FIG. 3 is a partial sectional view showing an embodiment of the method for forming a chrome coating according to the present invention, and FIG. 4 is a partial external view showing another embodiment of the method for forming a chrome coating according to the present invention.
１・・・鉄鋼材の母材 ２・・・溶接部３・・・熱
影響部 ４・・・クロムめっき層５・・・レー
ザ光 ７・・・溶体化域（８７３３）代理人
弁理士 猪 股 祥 晃（ほか１名）第
図
第
図
手続補正書（方式）1...Base material of steel material 2...Welded zone 3...Heat affected zone 4...Chromium plating layer 5...Laser light 7...Solution zone (8733) agent
Patent Attorney Yoshiaki Inomata (and 1 other person) Diagram/diagram procedural amendment (method)
Claims (1)
金の被覆を電気めっきで形成するクロム被覆の形成方法
において、前記母材の熱影響部に形成された前記クロム
又はクロム系合金の被覆にレーザ光を照射して、前記ク
ロム又はクロム系合金の被覆を溶融させ、前記母材に溶
着させたことを特徴とするクロム被覆の形成方法。In a method for forming a chromium coating in which a coating of chromium or a chromium-based alloy is formed on the outer surface of a heat-affected zone of a base material of a steel material by electroplating, the chromium or chromium-based alloy coating formed on the heat-affected zone of the base material A method for forming a chromium coating, comprising irradiating the coating with a laser beam to melt the chromium or chromium-based alloy coating and weld it to the base material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2039773A JPH03243792A (en) | 1990-02-22 | 1990-02-22 | Formation of chromium coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2039773A JPH03243792A (en) | 1990-02-22 | 1990-02-22 | Formation of chromium coating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03243792A true JPH03243792A (en) | 1991-10-30 |
Family
ID=12562255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2039773A Pending JPH03243792A (en) | 1990-02-22 | 1990-02-22 | Formation of chromium coating |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03243792A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102392247A (en) * | 2011-10-26 | 2012-03-28 | 首都航天机械公 | Electroplating method for middle local area of part for diffusion welding |
| JP2018189235A (en) * | 2017-04-28 | 2018-11-29 | ユニゾン・インダストリーズ，エルエルシー | Methods of forming strengthened component |
-
1990
- 1990-02-22 JP JP2039773A patent/JPH03243792A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102392247A (en) * | 2011-10-26 | 2012-03-28 | 首都航天机械公 | Electroplating method for middle local area of part for diffusion welding |
| JP2018189235A (en) * | 2017-04-28 | 2018-11-29 | ユニゾン・インダストリーズ，エルエルシー | Methods of forming strengthened component |
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