JP2974344B2 - Stainless steel bolts and nuts - Google Patents
Stainless steel bolts and nutsInfo
- Publication number
- JP2974344B2 JP2974344B2 JP1301045A JP30104589A JP2974344B2 JP 2974344 B2 JP2974344 B2 JP 2974344B2 JP 1301045 A JP1301045 A JP 1301045A JP 30104589 A JP30104589 A JP 30104589A JP 2974344 B2 JP2974344 B2 JP 2974344B2
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- plating
- nuts
- steel bolts
- corrosion resistance
- 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.)
- Expired - Lifetime
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- Chemically Coating (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、化学プラント等の腐食環境下で優れた耐食
性を持ち、かつ締結時にかじり、焼付き等が生じないス
テンレス製ボルト，ナットに関する。Description: TECHNICAL FIELD The present invention relates to stainless steel bolts and nuts that have excellent corrosion resistance in a corrosive environment such as a chemical plant and do not generate galling or seizure when fastening.
［従来の技術］ 化学プラトン、電気、機械、食品機器等で耐食性を要
求されるボルト、ナット、ネジ等として、ステンレス製
のものを使用するケースが増えている。[Related Art] Stainless steel bolts, nuts, screws, and the like, which require corrosion resistance in chemical platons, electric machines, machines, food appliances, and the like, are increasingly used.
前記ステンレスとしては、一般にオーステナイト系の
SUS304が使用されている。Generally, the austenitic stainless steel is used as the stainless steel.
SUS304 is used.
［発明が解決しようとする課題］ 前記オーステナイト系のSUS304は、炭素鋼に比べて摩
擦係数が大きく、かつ熱伝導率が小さいうえに熱膨張係
数が大きい等の性質を有している。[Problems to be Solved by the Invention] The austenitic SUS304 has properties such as a large coefficient of friction, a small thermal conductivity, and a large coefficient of thermal expansion as compared with carbon steel.
したがって、その締結時には発熱、膨張により、かじ
り、焼付きが発生し、作業に困難をきたす場合があっ
た。Therefore, at the time of the fastening, seizure and seizure may occur due to heat generation and expansion, which may make the work difficult.
それらかじり、焼付き防止対策として、表面にシュウ
酸あるいは弗素系の皮膜形成による方法が提案されてい
るが、形成される皮膜の硬度が低く、さらに容易に剥離
したりして再使用に耐えられないものであった。As a countermeasure against galling and seizure, a method of forming an oxalic acid or fluorine-based film on the surface has been proposed, but the formed film has a low hardness and can be easily peeled off to withstand reuse. There was nothing.
その他、使用に際して乾燥皮膜潤滑剤やペースト状の
潤滑剤を塗布することにより摩擦抵抗を低下させる方法
も提案されているが、該潤滑剤塗布の場合には経時変化
により油膜等が切れて目的が達成されない場合があると
ともに、食品機械分野の装置の使用には、腐食問題も絡
んで問題が残されていた。In addition, a method of reducing frictional resistance by applying a dry film lubricant or a paste-like lubricant at the time of use has also been proposed. However, in the case of applying the lubricant, an oil film or the like is cut due to aging and the purpose is reduced. In some cases, this was not achieved, and the use of equipment in the food machinery sector remained problematic, with a concern for corrosion.
また、特に海水等の腐食環境下での使用においては、
錆の発生が問題となるため、従来は高価なチタンが使用
されていた。In addition, especially when used in corrosive environments such as seawater,
Conventionally, expensive titanium has been used because rust is a problem.
前記錆の発生は、止め具の取り外しが不可能となった
り、止め具及び装置の破損を招く等、操作上大きな問題
となっていた。The generation of the rust has been a serious problem in operation, such as the inability to remove the stopper and the damage of the stopper and the device.
本発明は、前記事情に鑑みてなされたもので、耐食性
の向上、かじり、焼付き防止の効果の優れたステンレス
製ボルト、ナットを提供することを目的とするものであ
る。もっとも、本発明は、いわゆるネジを含むものであ
る。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a stainless steel bolt and nut excellent in corrosion resistance, galling, and seizure prevention. However, the present invention includes a so-called screw.
［課題を解決するための手段］ 本発明は、前記目的を達成するため、ステンレス製ボ
ルト、ナットにNi及びCu下地めっきを施し、ついでSnあ
るいはSnZn合金めっきを施し、熱拡散処理により表面に
Cu−Sn系及びFe−Sn系金属間化合物を形成させたもので
あり、好ましくは、トルク係数が0.2から0.4の間にある
ことを特徴とするものである。Means for Solving the Problems In order to achieve the above object, the present invention provides stainless steel bolts and nuts with Ni and Cu base plating, followed by Sn or SnZn alloy plating, and heat diffusion treatment on the surface.
It is formed by forming a Cu-Sn-based and Fe-Sn-based intermetallic compound, and preferably has a torque coefficient of between 0.2 and 0.4.
［作 用］ 金属間化合物は、純金属にに比べて、硬さ、耐摩耗性
及び耐食性に優れている。本発明で使用されるSnあるい
はSnZnは、従来よりブリキに用いられ、耐食性に優れて
いるとともに、凝着抑制効果をもっているため、機械部
品、軸受にも合金として使用されている。したがって、
めっき処理後で得られるη−Cu6Sn5,FeS2は、硬さがス
テンレスに対して十分高く、組織が緻密で潤滑性の良好
な皮膜であるため、ステンレス製ボルト、ナットのかじ
り、耐焼付き防止効果が優れているものである。[Operation] The intermetallic compound is excellent in hardness, wear resistance and corrosion resistance as compared with a pure metal. The Sn or SnZn used in the present invention has been conventionally used for tinplate, has excellent corrosion resistance, and has an effect of suppressing adhesion. Therefore, it is also used as an alloy in mechanical parts and bearings. Therefore,
Η-Cu 6 Sn 5 , FeS 2 obtained after plating is sufficiently high in hardness compared to stainless steel, and has a dense structure and good lubricating properties. It has an excellent anti-sticking effect.
また、耐食性については、めっき後の熱処理により形
成される金属間化合物の緻密化によって、めっき層のピ
ンホールが減少して耐食性を向上させるとともに、ステ
ンレスの素地に対して極めて貴になるため、良好な性質
を示すものと思われる。その他、めっき層中のフリーSn
残存効果で耐食性が向上している場合や、Zn含有のもの
はZnのアノード防食効果により耐食性がさらに向上させ
られるものである。In addition, regarding the corrosion resistance, the pinholes of the plating layer are reduced and the corrosion resistance is improved by densification of the intermetallic compound formed by the heat treatment after plating, and the corrosion resistance is extremely noble with respect to the stainless steel base material. It seems to show a characteristic. In addition, free Sn in plating layer
In the case where the corrosion resistance is improved due to the residual effect, or in the case where Zn is contained, the corrosion resistance is further improved by the anodic corrosion protection effect of Zn.
［実施例］ 以下に、関連実施例及び本発明の一実施例を説明す
る。[Embodiment] Hereinafter, a related embodiment and an embodiment of the present invention will be described.
［実施例１］ オーステナイト系SUS304材からなるステンレス製ボル
トを電解脱脂（NaOH 50g/1,NaCN 10g/,Na3PO4 2
0g/,NaCO3 10g/，界面活性材 1g/，室温）及び
硫酸処理（50wt％ H2SO4,室温）を行った後、直接Snめ
っきを施し、さらに熱拡散処理を最高430℃で８時間実
施した。その結果、得られためっき層の熱さは、10μｍ
である。Example 1 A stainless steel bolt made of austenitic SUS304 material was electrolytically degreased (NaOH 50 g / 1, NaCN 10 g /, Na 3 PO 4 2
0g /, NaCO 3 10g /, surfactant 1g /, room temperature) and sulfuric acid treatment (50wt% H 2 SO 4 , room temperature), then direct Sn plating, and heat diffusion treatment at 430 ° C max. Conducted for hours. As a result, the heat of the obtained plating layer was 10 μm
It is.
この処理においては、Snがステンレス母材中のFeと反
応し、FeSn2（一部はFeSn）の金属間化合物が形成さ
れ、硬さは350〜400HVと高い値を示し、耐焼付き性が向
上した。なお、トルク係数は0.25から0.3であった。In this treatment, Sn reacts with Fe in the stainless steel base material to form an intermetallic compound of FeSn 2 (partially FeSn), with a high hardness of 350 to 400 HV and improved seizure resistance did. The torque coefficient was between 0.25 and 0.3.
［実施例２］ オーステナイト系SUS304材からなるステンレス製ボル
トを前記実施例１と同様の電解脱脂及び硫酸処理を行っ
た後、直接SnZn合金めっきを施し、さらに熱拡散処理を
最高550℃で３時間実施した。[Example 2] A stainless steel bolt made of austenitic SUS304 material was subjected to electrolytic degreasing and sulfuric acid treatment in the same manner as in Example 1, and then directly subjected to SnZn alloy plating, and further subjected to thermal diffusion treatment at a maximum of 550 ° C for 3 hours. Carried out.
その結果、得られためっき層も前記実施例１とほぼ同
様の硬さとなり、耐焼付き性が向上した。As a result, the obtained plated layer also had substantially the same hardness as that of Example 1, and the seizure resistance was improved.
［実施例３］ 本発明の一実施例であり、オーステナイト系SUS304材
からなるステンレス製ボルトを前記実施例１と同様の電
解脱脂及び硫酸処理を行った後、密着性向上のため、Ni
下地めっきを施し、Cuめっき、ついでSnZn合金めっきを
施し、さらに熱拡散処理を最高400℃で10時間実施し
た。Example 3 This is an example of the present invention, in which a stainless steel bolt made of an austenitic SUS304 material is subjected to electrolytic degreasing and sulfuric acid treatment as in Example 1, and then Ni is added to improve adhesion.
Undercoating was performed, Cu plating was performed, and then SnZn alloy plating was performed, and thermal diffusion treatment was performed at a maximum of 400 ° C. for 10 hours.
前記各めっき条件は下記の通りである。 The plating conditions are as follows.
Ni下地めっき:NiCl2 6H2O 250g/,HCL 100g/室
温 Cuめっき :NACN 30g/,CuCN 20g/,NaCO320g/
，界面活性剤 2g/,45℃ SnZnめっき:NaCN 25g/,Na2SnO3 3H2O 75g/,Zn
（CN）２ 5g/,NaOH 15g/,65℃ 前記処理の結果、得られためっき層の厚さは、Cuめっ
き層５μm,SnZn層10μｍであり、Znの含有量は25wt％で
あった。Ni base plating: NiCl 2 6H 2 O 250 g /, HCL 100 g / room temperature Cu plating: NACN 30 g /, CuCN 20 g /, NaCO 3 20 g /
, Surfactant 2g /, 45 ℃ SnZn plating: NaCN 25g /, Na 2 SnO 3 3H 2 O 75g /, Zn
(CN) 2 5g /, NaOH 15g /, 65 ℃ result of the processing, the thickness of the resulting plating layer, Cu plating layer 5 [mu] m, an SnZn layer 10 [mu] m, the content of Zn was 25 wt%.
この処理においては、めっき中のNi,Cu,SnならびにZn
の拡散が起こり、η−Cu6Sn5（一部はCu3Sn）の金属間
化合物が形成され、硬さは350〜400HVと高いうえに、潤
滑性が良好であった。In this process, Ni, Cu, Sn and Zn
, An intermetallic compound of η-Cu 6 Sn 5 (partially Cu 3 Sn) was formed, the hardness was as high as 350 to 400 HV, and the lubricity was good.
また、Snの一部はステンレス母材中のFeと反応してFe
Sn2を形成し、ステンレスとの密着性が向上させられ
た。Some of the Sn reacts with Fe in the stainless steel
Sn 2 was formed, and the adhesion to stainless steel was improved.
［実施例４］ 本発明の他の一実施例であり、オーステナイト系SUS3
04材からなるステンレス製ボルトを前記実施例１と同様
の電解脱脂及び硫酸処理を行った後、密着性向上のた
め、Ni下地めっきを施し、Cuめっき、ついでSnめっきを
施し、さらに熱拡散処理を200℃で20時間実施した。Sn
めっき条件は、前記実施例３と同様である。前記処理の
結果、得られためっき層の厚さは、Cuめっき５μm,Snが
10μｍである。Embodiment 4 Another embodiment of the present invention is an austenitic SUS3
After performing the same electrolytic degreasing and sulfuric acid treatment on the stainless steel bolt made of the 04 material as in the first embodiment, in order to improve the adhesion, Ni plating is applied, Cu plating is applied, then Sn plating is applied, and thermal diffusion treatment is performed. Was carried out at 200 ° C. for 20 hours. Sn
The plating conditions are the same as in the third embodiment. As a result of the above treatment, the thickness of the plating layer obtained was 5 μm for Cu plating and Sn for Cu plating.
10 μm.
第１図には、未処理及び前記各実施例によって得られ
たステンレスボルトのトルク係数の変化が示されてい
る。FIG. 1 shows the change in the torque coefficient of the untreated and stainless steel bolts obtained in each of the above embodiments.
すなわち、前記各ステンレスボルトの耐焼付き性評価
のため、締め付け操作を数回（最大10回）繰り返して行
い、軸力1000Kgf時のトルクを測定して計算によりトル
ク係数を求めたものである。That is, in order to evaluate the seizure resistance of each of the stainless steel bolts, the tightening operation was repeated several times (up to 10 times), the torque at an axial force of 1000 kgf was measured, and the torque coefficient was obtained by calculation.
同図に示されているように、未処理のボルトは、締め
付け回数につれてトルク係数が次第に上昇して焼付きに
至るが、他の前記実施例ではトルク係数の上昇がほとん
ど見られず、最大10回締め付けた場合でも焼付きが発生
せず、締め付け回数にかかわらず係数がほぼ一定であ
り、0.2から0.4の間にあり、前記実施例中でも、特に本
発明にかかる前記実施例３及び４が良好な特性を示すこ
とが判明した。As shown in the figure, the untreated bolt has a torque coefficient that gradually increases as the number of tightening times increases, resulting in seizure. Seizure does not occur even when tightened twice, the coefficient is almost constant irrespective of the number of times of tightening, is between 0.2 and 0.4, and among the above examples, Examples 3 and 4 according to the present invention are particularly good. It turned out that it shows a characteristic.
すなわち、本発明のステンレスボルトは、耐焼付き性
に優れていることが確認されたものである。That is, it was confirmed that the stainless steel bolt of the present invention had excellent seizure resistance.
第２図には、複合腐食試験結果が示されている。ステ
ンレスボルトは、耐食性が良好であるため、化学プラン
ト、電気、機械、食品機器等に使用されているが、特に
海岸地帯ならびに海水に接触する装置、機器では錆が問
題となる。FIG. 2 shows the results of the composite corrosion test. Stainless steel bolts have good corrosion resistance and are therefore used in chemical plants, electricity, machinery, food equipment, and the like. However, rust is a problem particularly in equipment and equipment that come into contact with coastal areas and seawater.
そこで、耐食性評価の複合腐食試験を行ったものであ
る。該複合腐食試験は、人工海水を用いて35℃、４時間
塩水噴霧を行った後、乾燥60℃で２時間、湿潤試験50℃
で２時間のサイクルを繰り返し行う方法であり、極めて
厳しい腐食試験である。Therefore, a composite corrosion test for evaluating corrosion resistance was performed. The composite corrosion test was performed by spraying salt water for 4 hours at 35 ° C using artificial seawater, and then drying for 2 hours at 60 ° C and a wet test at 50 ° C.
This is a method of repeating a two-hour cycle, which is an extremely severe corrosion test.
同図に示されているように、未処理のボルトは、２日
で錆の発生が見られるが、他の前記実施例では前記未処
理のボルトに比べて錆の発生が遅く、前記実施例中で
も、特に本発明にかかる前記実施例３では、45サイクル
の試験後でも錆の発生が見られないものであった。ま
た、錆の形態も未処理のボルトの場合と異なっており、
耐食性が非常に高いことが判明したものである。As shown in the figure, the rust is observed in the untreated bolt in two days, but in the other examples, the rust is slower than that in the untreated bolt. Above all, particularly in Example 3 according to the present invention, no rust was observed even after the test of 45 cycles. Also, the form of rust is different from untreated bolts,
It has been found that the corrosion resistance is very high.
［発明の効果］ 前記本発明のステンレス製ボルト、ナットは、表面に
金属間化合物が形成され、耐食性の向上、かじり、焼付
き防止効果が極めて優れているものである。[Effects of the Invention] The stainless steel bolts and nuts of the present invention have an intermetallic compound formed on the surface and are extremely excellent in the effects of improving corrosion resistance, galling and seizing.
第１図はステンレス製ボルトの締め付け回数とトルク係
数の関係を示した線図、第２図は複合腐食試験結果を示
したグラフである。FIG. 1 is a diagram showing the relationship between the number of tightening of stainless steel bolts and the torque coefficient, and FIG. 2 is a graph showing the results of a composite corrosion test.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭59−200803（ＪＰ，Ａ) 特開 昭50−61561（ＪＰ，Ａ) 特開 昭60−139909（ＪＰ，Ａ) 特開 昭53−92335（ＪＰ，Ａ) 特開 昭51−115240（ＪＰ，Ａ) 特開 昭58−61268（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) C23C 18/48 - 18/50 F16B 33/06 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-200803 (JP, A) JP-A-50-61561 (JP, A) JP-A-60-139909 (JP, A) JP-A 53-2008 92335 (JP, A) JP-A-51-115240 (JP, A) JP-A-58-61268 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) C23C 18/48-18 / 50 F16B 33/06
Claims (4)
し、ついでSnあるいはSnZn合金めっきを施し、熱拡散処
理により表面にCu−Sn系及びFe−Sn系金属間化合物を形
成させてなることを特徴とするステンレス製ボルト、ナ
ット。1. A method in which a stainless steel surface is plated with Ni and Cu underlayers, followed by Sn or SnZn alloy plating, and Cu-Sn-based and Fe-Sn-based intermetallic compounds are formed on the surface by thermal diffusion treatment. Features stainless steel bolts and nuts.
し、ついでSnあるいはSnZn合金めっきを施し、熱拡散処
理により表面にFe−Sn系及びFe−Sn系金属間化合物を形
成させてなるステンレス製ボルト、ナットであって、ト
ルク係数が0.2から0.4の間にあることを特徴とするステ
ンレス製ボルト、ナット。2. A stainless steel product in which a stainless steel surface is plated with Ni and Cu underlayers, followed by Sn or SnZn alloy plating, and Fe-Sn-based and Fe-Sn-based intermetallic compounds are formed on the surface by thermal diffusion treatment. Stainless steel bolts and nuts, wherein the torque coefficient is between 0.2 and 0.4.
びCu3Snであることを特徴とする請求項１または２に記
載のステンレス製ボルト、ナット。3. The stainless steel bolt or nut according to claim 1, wherein the Cu—Sn intermetallic compound is η-Cu 6 Sn 5 and Cu 3 Sn.
ことを特徴とする請求項１または２に記載のステンレス
製ボルト、ナット。4. A stainless steel bolt, nut according to claim 1 or 2 wherein the FeSn system intermetallic compound is characterized in that it is a FeSn 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1301045A JP2974344B2 (en) | 1989-11-20 | 1989-11-20 | Stainless steel bolts and nuts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1301045A JP2974344B2 (en) | 1989-11-20 | 1989-11-20 | Stainless steel bolts and nuts |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11059889A Division JP3099119B2 (en) | 1999-03-08 | 1999-03-08 | Stainless steel bolts and nuts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03162587A JPH03162587A (en) | 1991-07-12 |
| JP2974344B2 true JP2974344B2 (en) | 1999-11-10 |
Family
ID=17892197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1301045A Expired - Lifetime JP2974344B2 (en) | 1989-11-20 | 1989-11-20 | Stainless steel bolts and nuts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2974344B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2844255B2 (en) * | 1990-09-07 | 1999-01-06 | 同和鉱業株式会社 | Stainless steel bolts and nuts for torque control and their fabrication |
| DE29801049U1 (en) * | 1998-01-22 | 1998-04-30 | Emhart Inc., Newark, Del. | Body component with a tin-zinc coating |
-
1989
- 1989-11-20 JP JP1301045A patent/JP2974344B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03162587A (en) | 1991-07-12 |
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