JPH0830258B2 - Boron treatment method for iron and steel - Google Patents
Boron treatment method for iron and steelInfo
- Publication number
- JPH0830258B2 JPH0830258B2 JP14621786A JP14621786A JPH0830258B2 JP H0830258 B2 JPH0830258 B2 JP H0830258B2 JP 14621786 A JP14621786 A JP 14621786A JP 14621786 A JP14621786 A JP 14621786A JP H0830258 B2 JPH0830258 B2 JP H0830258B2
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- JP
- Japan
- Prior art keywords
- salt
- steel
- iron
- temperature
- boron
- 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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- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、鉄および鋼の浸硼処理に関し、特に低温で
の浸硼処理を可能とし、寸法変化，硬さ変化が少なくか
つ浸硼処理後、被処理物に付着する浸硼剤の洗浄除去が
容易な鉄および鋼の浸硼処理方法に関するものである。Description: TECHNICAL FIELD The present invention relates to a boron immersion treatment of iron and steel, and in particular, enables a boron immersion treatment at a low temperature, has little dimensional change and hardness change, and has a boron immersion treatment. After that, the present invention relates to a method for boroboring of iron and steel in which the boroboring agent adhering to the object to be treated can be easily removed by washing.
（従来の技術） 鉄および鋼の表面に硼素を浸硼させ、表面層の硬さを
高くして耐摩耗性を向上し、また緻密なボロン化層によ
って耐食性を付与させることを目的とする浸硼処理方法
としては、塩化硼素と水素などを用いるガス法、炭化硼
素と塩化アンモニウムなどを用いる粉末パック法、硼砂
と炭化珪素などの混合溶融塩を用いて電解する電解法、
硼砂と炭化珪素などの混合溶融塩を用いて浸漬する浸漬
法などが知られている。(Prior art) Immersion of boron on the surface of iron and steel to increase the hardness of the surface layer to improve wear resistance, and to impart corrosion resistance with a dense boronized layer. Examples of the boron treatment method include a gas method using boron chloride and hydrogen, a powder packing method using boron carbide and ammonium chloride, an electrolysis method using a mixed molten salt of borax and silicon carbide, and the like.
A dipping method in which a mixed molten salt of borax and silicon carbide is used for dipping is known.
（発明が解決しようとする問題点） 前記ガス法は装置が複雑で操作に危険があり、原料も
高価で処理時間が長いなどの欠点があり殆んど実用化さ
れない。(Problems to be Solved by the Invention) The gas method is hardly practically used due to its disadvantages such as complicated apparatus, dangerous operation, and expensive raw materials and long processing time.
一方、前記粉末パック法，電解法，浸漬法はいずれも
800℃以上の高温で処理される方法である。鉄および鋼
の加熱，冷却による変形は、750℃以下では単純な膨張
収縮があるのみで変形は極めて少ないが、750℃を上廻
って加熱するとA1変態を生じ、冷却に際し不可逆的な変
形を生じ、変形量が大きくなる。また、850℃以上の高
温で処理する従来の方法によれば、変形率0.2〜0.3％で
変形し、内部硬度もブリネル硬度で30〜50上昇し、寸法
変化，硬さ変化を生ずる欠点がある。On the other hand, the powder pack method, the electrolytic method, and the dipping method are all
This is a method of processing at a high temperature of 800 ° C or higher. Deformation due to heating and cooling of iron and steel is extremely small with only simple expansion and contraction at 750 ° C or less, but when heated above 750 ° C, A 1 transformation occurs and irreversible deformation occurs during cooling. Occurs and the amount of deformation increases. Further, according to the conventional method of treating at a high temperature of 850 ° C. or higher, the deformation rate is 0.2 to 0.3%, the internal hardness is increased by 30 to 50 in Brinell hardness, and there is a drawback that dimensional change and hardness change occur. .
浸硼処理した鉄および鋼の表面層はビッカース硬度で
1500以上となるため、寸法変化を訂正するための研削な
どの表面加工は極めて困難であるのみならず、寸法調整
のための加工を施すと、浸硼層が削りとられて薄くな
り、浸硼効果が著しく減少するほか、浸硼層が使用時に
剥離する危険がある。The surface layers of iron and steel that have been subjected to boroboring have Vickers hardness.
Since it is 1500 or more, surface processing such as grinding to correct dimensional changes is extremely difficult, and when processing for dimension adjustment is performed, the boron-implanted layer is scraped off and thinned, The effect is significantly diminished and there is a risk that the boron layer will peel off during use.
さらに、従来の溶融塩法によれば、硼砂を主成分とし
炭化珪素などを混合した溶融塩が用いられるが、この種
の溶融塩は水に対する溶解度が少なく、電解法，浸漬法
の処理を行った後に被処理物に付着した塩は容易に除去
することができず、酸処理を施すと酸によって分解した
塩は再使用不能なので、廃棄せねばならないゆえ、コス
ト高となるのみならず、廃棄は公害の原因となる問題が
ある。Further, according to the conventional molten salt method, a molten salt containing borax as a main component and mixed with silicon carbide or the like is used. However, this type of molten salt has a low solubility in water, and thus the electrolytic method and the dipping method are used. The salt adhering to the material to be treated cannot be removed easily, and the salt decomposed by the acid cannot be reused if it is treated with acid, so it must be discarded. Has problems that cause pollution.
（問題点を解決するための手段） 本発明は、従来技術の有する前記諸問題を除去・改善
することのできる浸硼処理方法を提供することを目的と
するものであり、特許請求の範囲記載の方法を提供する
ことによって、前記目的を達成することができる。すな
わち、本発明は、 1.Na2O 10〜25％，K2O15〜30％とさらにLi2O 2〜24％を
含有し、残部不可避的不純物とB2O3とからなる溶融塩を
用い、前記溶融塩を構成する塩が揮発する温度より低
く、かつ前記溶融塩の溶融温度以上の温度において、浸
漬法，電解法のいずれか一つの方法により鉄および鋼を
浸硼することを特徴とする処理後被処理物の寸法変化，
硬さ変化が少なく、付着した塩を容易に除去することが
できる鉄および鋼の浸硼処理方法、 2.上記の浸硼処理方法において、電解法を、750℃を上
廻らない温度の上記成分組成の溶融塩を用い、被処理物
を陰極、るつぼを陽極として電解することにより浸硼さ
せることを特徴とする鉄および鋼の浸硼処理方法、 である。(Means for Solving Problems) An object of the present invention is to provide a method for immersing boron treatment capable of removing and improving the above-mentioned various problems of the prior art. The above object can be achieved by providing the above method. That is, the present invention is, 1.Na 2 O 10~25%, containing K 2 O15~30% and 2-24% more Li 2 O, the molten salt consisting of the balance unavoidable impurities B 2 O 3 Metropolitan Characterized by immersing iron and steel by a dipping method or an electrolysis method at a temperature lower than the temperature at which the salt constituting the molten salt volatilizes and at a temperature higher than the melting temperature of the molten salt. Dimensional change of the processed object after treatment,
2. A method for immersing iron and steel in which hardness change is small and which can easily remove adhered salts, 2. In the above method for immersing boron, the electrolysis method is carried out at a temperature not exceeding 750 ° C. A method for immersing boron in iron and steel, characterized in that a molten salt having a composition is used, and a material to be treated is electrolyzed using a cathode and a crucible as an anode to electrolyze.
（作用） 以下に本発明の構成の詳細を説明する。(Operation) Details of the configuration of the present invention will be described below.
本発明者ら数多くの実験を行い、Na2O 10〜25％，K2O
15〜30％、残部B2O3にLi2Ｏを２〜24％添加することに
より、溶融塩の融点を下げた結果、750℃を上廻らぬ温
度で浸漬法または電解法によって鉄および鋼に浸硼する
ことができ、しかも前記成分組成の塩は水に対する溶融
度が極めて大きいことを知見し本発明を完成した。The inventors of the present invention conducted many experiments and found that Na 2 O 10 to 25%, K 2 O
As a result of lowering the melting point of the molten salt by adding 15 to 30% and 2 to 24% of Li 2 O to the balance of B 2 O 3 , iron and steel can be produced by a dipping method or an electrolytic method at a temperature not exceeding 750 ° C. The present invention has been completed based on the finding that the salt having the above-mentioned component composition has an extremely high degree of melting in water.
本発明による前記成分組成の塩は前記したように、水
に対する溶解度が極めて大きいので、浸硼処理後冷却し
た被処理物を水中または温水に投入し、ブラシなどで表
面を擦ることにより容易に付着した塩を洗い落とすこと
ができる。また洗浄後の洗浄液に含まれる塩は、洗浄液
を蒸発させることにより回収可能であり、本発明による
浸硼処理は極めて有利である。なお本発明の塩が水溶性
である機構，理由は不詳である。As described above, the salt of the component composition according to the present invention has an extremely high solubility in water, so that the object to be treated that has been cooled after the soaking treatment is put into water or warm water, and easily adhered by rubbing the surface with a brush or the like. The salt can be washed off. Further, the salt contained in the cleaning liquid after cleaning can be recovered by evaporating the cleaning liquid, and the boration treatment according to the present invention is extremely advantageous. The mechanism and reason why the salt of the present invention is water-soluble is unknown.
さらに本発明による浸硼処理方法は、750℃を超えな
い温度で浸硼処理を施すことができるため、変形率0.1
％以下で、被処理物内部の硬化も殆ど認められず、寸法
変化および内部の硬度変化を少なくすることができた。Further, in the method of immersing boron according to the present invention, since the immersing treatment can be performed at a temperature not exceeding 750 ° C., the deformation ratio is 0.1
% Or less, hardening inside the object to be treated was hardly observed, and dimensional change and internal hardness change could be reduced.
次に塩成分の限定理由について述べる。 Next, the reasons for limiting the salt components will be described.
鉄および鋼の浸硼処理塩に、B2O3を主成分とし、Na
2O,K2Ｏを加えた塩を用いることはよく知られており、
とくにNa2Ｏ−B2O3系の塩がよく用いられている。この
系ではNa2Ｏ−B2O3より、Na2Ｏの比率が多い範囲に溶融
点の低いもの（例えば融点675℃の３Na2Ｏ・B2O3）など
があるが、この種の塩を用いて電解処理を行ってもB2O3
の含有量が少ないため浸硼しない。B 2 O 3 is the main component in the iron and steel impregnated salt, and Na
It is well known to use salts with the addition of 2 O, K 2 O,
Particularly, Na 2 O—B 2 O 3 type salts are often used. In this system, there is a low melting point (for example, 3Na 2 O.B 2 O 3 with a melting point of 675 ° C) in a range where the ratio of Na 2 O is higher than that of Na 2 O-B 2 O 3 , but this type of Even if electrolytic treatment is performed using salt, B 2 O 3
Since it has a low content of
また、Na2Ｏ・B2O3の融点は、968℃で高温であるた
め、一般には、Na2Ｏ・２B2O3（硼砂）が用いられる
が、その融点は742℃であるから、浸硼処理温度は800℃
以上であるのみならず、硼砂は水に対する溶解度が少な
いため、処理後、被処理部に付着した塩を除去するのが
困難である。また、B2O3比率の多い塩には融点の低いも
の（例えば融点682℃のNa2Ｏ・９B2O3）はあるが、これ
らは硼砂以上に洗浄性が悪く、使用することができな
い。したがって、Na2Ｏ−B2O3系のみの塩では低温浸硼
処理は不可能である。Further, since the melting point of Na 2 O · B 2 O 3 is high at 968 ° C., Na 2 O · 2B 2 O 3 (borax) is generally used, but its melting point is 742 ° C. Boron treatment temperature is 800 ℃
In addition to the above, since borax has a low solubility in water, it is difficult to remove the salt adhering to the treated portion after the treatment. Also, there are some salts with a high B 2 O 3 ratio, which have a low melting point (for example, Na 2 O.9B 2 O 3 with a melting point of 682 ° C.), but these have poorer cleaning properties than borax and cannot be used. . Therefore, the low-temperature boroboring treatment cannot be performed only with the Na 2 O—B 2 O 3 system salt.
本発明による塩の組成は、数多くの実験の結果発見さ
れたもので、Na2Ｏ−K2Ｏ−Li2Ｏ−B2O3系のものであ
る。The composition of the salt according to the present invention has been discovered as a result of numerous experiments and is based on the Na 2 O—K 2 O—Li 2 O—B 2 O 3 system.
第１図に、Na2O10〜25％，K2O 15〜30％，残部実質的
にB2O3の塩に、Li2Ｏを加えた場合の塩のLi2Ｏ濃度と溶
融点との関係を示したもので、この図から、700℃での
浸硼処理が可能な塩のLi2Ｏの濃度は２〜24％とすべき
ことが判る。また、実験の結果、この組成の塩の水溶性
は良好であった。FIG. 1 shows the Li 2 O concentration and the melting point of the salt when Li 2 O is added to the salt of Na 2 O 10 to 25%, K 2 O 15 to 30% and the balance substantially B 2 O 3. From this figure, it is understood that the concentration of Li 2 O in the salt that can be subjected to the boron immersion treatment at 700 ° C. should be 2 to 24%. As a result of the experiment, the water solubility of the salt having this composition was good.
これらの関係から、溶融点が低く、700℃での浸硼が
可能で、かつ水溶性に優れた塩の組成は、Na2O 10〜25
％，K2O 15〜30％，Li2O 2〜24％、残部B2O3の範囲とす
る必要がある。From these relationships, the composition of the salt, which has a low melting point, is capable of being borated at 700 ° C, and has excellent water solubility, is Na 2 O 10-25
%, K 2 O 15 to 30%, Li 2 O 2 to 24%, and the balance B 2 O 3 in the range.
次に本発明に実施例について説明する。 Next, examples of the present invention will be described.
（実施例１） Na2O 19.27％，K2O 23.99％，B2O353.45％，Li2O 3.2
9％の組成の塩を用い、S25C材に対し、処理温度700℃，
電流密度0.2Amp/cm2，処理時間１時間の電解条件で浸硼
処理を施した。(Example 1) Na 2 O 19.27%, K 2 O 23.99%, B 2 O 3 53.45%, Li 2 O 3.2
Using the salt of 9% composition, S25C material, processing temperature 700 ℃,
Boron treatment was performed under the electrolytic conditions of a current density of 0.2 Amp / cm 2 and a treatment time of 1 hour.
第２図は、浸硼処理後被処理物を切断研磨し、３％ナ
イタール液で腐食した表面層組織の顕微鏡写真（×25
0）である。表面層の硬さはビッカース硬さ1300で、付
着していた塩は70℃の温水中で完全に除去することがで
きた。Fig. 2 is a photomicrograph of the surface layer structure (× 25
0). The hardness of the surface layer was Vickers hardness 1300, and the adhering salt could be completely removed in hot water at 70 ° C.
（実施例２） Na2O 14.50％，K2O 18.08％，B2O360.80％，Li2O 6.6
4％の組成の塩を750℃に加熱し、この溶融塩にSK3材を
３時間浸漬して浸硼処理を施した。(Example 2) Na 2 O 14.50%, K 2 O 18.08%, B 2 O 3 60.80%, Li 2 O 6.6
A salt having a composition of 4% was heated to 750 ° C., and SK3 material was dipped in this molten salt for 3 hours to carry out a soaking treatment.
第３図は、浸硼処理後被処理物を切断研磨し、３％ナ
イタール液で腐食した表面層組織の顕微鏡写真（×25
0）である。浸硼層の硬さはビッカース硬さ1500で、浸
硼処理後50℃の温水中に30分間被処理物を漬け、清浄な
ものとなった。Fig. 3 is a photomicrograph (× 25
0). The hardness of the impregnated layer was Vickers hardness of 1500, and after the impregnation treatment, the object to be treated was soaked in warm water at 50 ° C for 30 minutes to be clean.
以上、溶融塩の成分組成を本発明による新規な組成に
調整することにより、750℃を上廻らない温度で浸硼処
理が施され、被処理物の寸法変化、硬さ変化を少なく、
かつ付着した塩も容易に除去することができた。As described above, by adjusting the component composition of the molten salt to a novel composition according to the present invention, the boroboring treatment is performed at a temperature not exceeding 750 ° C., the dimensional change of the object to be treated, the hardness change is small,
Moreover, the attached salt could be easily removed.
（発明の効果） 近来、金属表面を改質し、高性能表面を有する金属材
料を製造する技術開発が行われており、鉄鋼の表面に硼
素を浸硼させる処理方法も多く提案されている。(Effects of the Invention) Recently, technological development for modifying a metal surface to produce a metal material having a high-performance surface has been carried out, and many treatment methods for immersing boron on the surface of steel have been proposed.
しかし、従来法では処理による寸法変化，内部硬度変
化が大きく、また処理剤の除去が容易でないため実用化
が遅れている。However, in the conventional method, the dimensional change and the internal hardness change due to the treatment are large, and the removal of the treating agent is not easy, so that its practical application is delayed.
本発明によれば上記諸欠点が解決されるため、安価な
鉄系材料に、セラミックスに優る表面性能を与えた複合
材料を製造することができ、今後高性能機械部品などへ
の応用が期待される。According to the present invention, since the above-mentioned various drawbacks are solved, it is possible to manufacture a composite material in which an inexpensive iron-based material is provided with a surface performance superior to that of ceramics, and it is expected that the composite material will be applied to high-performance mechanical parts in the future. It
第１図は、Li2Ｏ％と溶融点との関係を示す図、第２
図，第３図はそれぞれ、S25C材,SK3材に、本発明方法に
より浸硼処理を施した浸硼層を有する金属組織の顕微鏡
写真（×250）である。Figure 1 shows the relationship between Li 2 O% and melting point, 2
FIG. 3 and FIG. 3 are photomicrographs (× 250) of S25C material and SK3 material, respectively, having a boron-immobilized layer obtained by the method of the present invention.
Claims (2)
O 2〜24％を含有し、残部不可避的不純物とB2O3とから
なる溶融塩を用い、前記溶融塩を構成する塩が揮発する
温度より低く、かつ前記溶融塩の溶融温度以上の温度に
おいて、浸漬法，電解法のいずれか一つの方法により鉄
および鋼を浸硼することを特徴とする処理後被処理物の
寸法変化，硬さ変化が少なく、付着した塩を容易に除去
することができる鉄および鋼の浸硼処理方法。1. Na 2 O 10 to 25%, K 2 O 15 to 30% and further Li 2
Using a molten salt containing O 2 to 24% and the balance unavoidable impurities and B 2 O 3 , the temperature is lower than the temperature at which the salt constituting the molten salt volatilizes, and a temperature equal to or higher than the melting temperature of the molten salt. In (1), there is little dimensional change and hardness change of the object to be processed after treatment, characterized by immersing iron and steel by either one of the dipping method and the electrolytic method, and easily removing the deposited salt. A method for immersing iron and steel in which boron can be treated.
上記成分組成の溶融塩を用い、鉄および鋼を陰極、るつ
ぼを陽極として電解することにより浸硼させることを特
徴とする特許請求の範囲第１項記載の方法。2. The electrolysis method is characterized in that a molten salt having the above-described composition is used at a temperature not exceeding 750 ° C., and iron and steel are used as a cathode and a crucible is used as an anode to carry out electrolysis to obtain boron. The method according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14621786A JPH0830258B2 (en) | 1986-06-24 | 1986-06-24 | Boron treatment method for iron and steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14621786A JPH0830258B2 (en) | 1986-06-24 | 1986-06-24 | Boron treatment method for iron and steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS634094A JPS634094A (en) | 1988-01-09 |
| JPH0830258B2 true JPH0830258B2 (en) | 1996-03-27 |
Family
ID=15402757
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14621786A Expired - Lifetime JPH0830258B2 (en) | 1986-06-24 | 1986-06-24 | Boron treatment method for iron and steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0830258B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110453237A (en) * | 2019-09-02 | 2019-11-15 | 江西理工大学 | A method for preparing titanium diboride coating by molten salt electrolysis |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE525477C2 (en) * | 2003-07-10 | 2005-03-01 | Sandvik Ab | Electric heating element with radiation tube |
| CN102517542B (en) * | 2011-12-16 | 2013-08-14 | 广西师范大学 | Boriding agent for boriding on metallic titanium surface and boriding technique |
-
1986
- 1986-06-24 JP JP14621786A patent/JPH0830258B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110453237A (en) * | 2019-09-02 | 2019-11-15 | 江西理工大学 | A method for preparing titanium diboride coating by molten salt electrolysis |
| CN110453237B (en) * | 2019-09-02 | 2021-08-20 | 江西理工大学 | A kind of method for preparing titanium diboride coating by molten salt electrolysis |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS634094A (en) | 1988-01-09 |
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