JPH0765182B2 - Surface treatment method for sintered parts - Google Patents
Surface treatment method for sintered partsInfo
- Publication number
- JPH0765182B2 JPH0765182B2 JP61250265A JP25026586A JPH0765182B2 JP H0765182 B2 JPH0765182 B2 JP H0765182B2 JP 61250265 A JP61250265 A JP 61250265A JP 25026586 A JP25026586 A JP 25026586A JP H0765182 B2 JPH0765182 B2 JP H0765182B2
- Authority
- JP
- Japan
- Prior art keywords
- treatment
- sintered
- treated
- film
- surface treatment
- 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
Links
- 238000004381 surface treatment Methods 0.000 title claims description 11
- 238000000034 method Methods 0.000 title claims description 5
- 238000011282 treatment Methods 0.000 claims description 34
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 22
- 239000011347 resin Substances 0.000 claims description 18
- 229920005989 resin Polymers 0.000 claims description 18
- 229910052742 iron Inorganic materials 0.000 claims description 9
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 6
- 239000011701 zinc Substances 0.000 claims description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 239000011651 chromium Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- 239000003638 chemical reducing agent Substances 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 239000004094 surface-active agent Substances 0.000 claims description 2
- 238000007654 immersion Methods 0.000 claims 1
- 238000007789 sealing Methods 0.000 claims 1
- 230000007797 corrosion Effects 0.000 description 16
- 238000005260 corrosion Methods 0.000 description 16
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 10
- 239000011248 coating agent Substances 0.000 description 10
- 238000000576 coating method Methods 0.000 description 10
- 239000011737 fluorine Substances 0.000 description 10
- 229910052731 fluorine Inorganic materials 0.000 description 10
- 239000000463 material Substances 0.000 description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 5
- 235000019353 potassium silicate Nutrition 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 5
- 239000007921 spray Substances 0.000 description 5
- 239000011148 porous material Substances 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- CPSYWNLKRDURMG-UHFFFAOYSA-L hydron;manganese(2+);phosphate Chemical compound [Mn+2].OP([O-])([O-])=O CPSYWNLKRDURMG-UHFFFAOYSA-L 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000012085 test solution Substances 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 1
- 229910000165 zinc phosphate Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
- C23C22/74—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process for obtaining burned-in conversion coatings
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Powder Metallurgy (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、自動車、家電機器、事務機、船外機、釣具等
の各種器械に利用される鉄系焼結部品の耐食性を向上さ
せるための表面処理法に関するものであり、焼結部品の
寿命を飛躍的に向上せしめ、その利用範囲を拡大せしめ
ることを目的とする。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is intended to improve the corrosion resistance of iron-based sintered parts used in various machines such as automobiles, home appliances, office machines, outboard motors, fishing tackles and the like. The present invention relates to a surface treatment method, and aims to dramatically improve the service life of a sintered part and expand its range of use.
（従来の技術） 従来、鉄系焼結部品の耐食性向上としては、防錆油油漬
や、水蒸気処理、あるいはめつき処理が挙げられるが、
これらは短時間の防錆効果はあるものの、近年自動車部
品をはじめとして各種部品に要求される耐食性は増々厳
しくなり、従来の処理では対応できなくなつてきた。(Prior Art) Conventionally, as corrosion resistance improvement of iron-based sintered parts, rust-preventive oil pickling, steam treatment, or plating treatment can be mentioned.
Although these have an anticorrosive effect for a short period of time, the corrosion resistance required for various parts including automobile parts has become increasingly severe in recent years, and it has become impossible to cope with them by conventional treatments.
そこで出願人は既に、水蒸気処理＋ダクロタイズド処理
＋樹脂又は水ガラスコーテイングを組み合わせる事によ
つて塩水噴霧試験で240Hr以上赤錆発生なしという画期
的な表面処理方法を開発した。Therefore, the applicant has already developed an epoch-making surface treatment method in which red rust does not occur for 240 hours or more in a salt spray test by combining steam treatment + dacrotized treatment + resin or water glass coating.
（発明が解決しようとする問題点） しかし乍ら世の中の耐食性に対する要求はさらに厳しく
なり、塩水噴霧480Hr赤錆発生無しというのも一般的と
なつており、しかも現実の要求はもつと厳しい部品（自
動車のアンチロツクブレーキシステム用センサーリング
等）も挙げられる。(Problems to be solved by the invention) However, the demand for corrosion resistance in the world has become more severe, and it is common that salt spray 480Hr does not cause red rust, and the actual requirements are strict. Sensor rings for anti-lock brake systems).
これらに対しては、従来の水蒸気処理＋ダクロタイズド
＋樹脂又は水ガラスコーテイングでは、表面処理が剥離
し、鉄地が露出するので使用途中で部品が欠けたりして
機能上大きな害を生じていた。On the other hand, in the conventional steam treatment + dacrotized + resin or water glass coating, the surface treatment is peeled off and the iron material is exposed, so that parts are chipped during use and a large functional damage is caused.
上記に鑑み本発明はこの様な問題点を解消するため開発
されたものである。In view of the above, the present invention was developed to solve such problems.
（問題点を解決するための手段） 即ち本発明の焼結部品の表面処理方法は、鉄系焼結部品
の表面処理において、まず該焼結部品を水蒸気と水素を
含む雰囲気中で処理して該焼結部品の表面に緻密な酸化
鉄皮膜を形成せしめ表面層を封孔する処理を施し、その
後該処理部品を亜鉛、アルミニウムの１種または２種、
６価クロム供給物質および該物質に対する還元剤ならび
に表面活性剤からなる混合物が液状媒体中に分散した処
理液に浸漬した後250℃〜400℃で加熱し揮発成分を焼失
せしめ焼結部品の表面に亜鉛および／またはアルミニウ
ムの粒子が３価クロム重合物で囲まれた皮膜を形成させ
る処理を施し、さらに該処理部品の表層部に弗素系樹脂
の皮膜を形成させる処理を施すことを特徴とするもので
ある。(Means for Solving Problems) That is, in the surface treatment method for a sintered part of the present invention, in the surface treatment of an iron-based sintered part, the sintered part is first treated in an atmosphere containing steam and hydrogen. The surface of the sintered part is formed with a dense iron oxide film and the surface layer is sealed, and then the processed part is treated with one or two of zinc and aluminum,
A mixture of a hexavalent chromium supplying substance, a reducing agent for the substance and a surface active agent is immersed in a treatment liquid dispersed in a liquid medium, and then heated at 250 ° C to 400 ° C to burn off volatile components to the surface of the sintered part. Characterized in that zinc and / or aluminum particles are subjected to a treatment to form a film surrounded by a trivalent chromium polymer, and further a treatment to form a film of a fluorine resin on the surface layer part of the treated parts. Is.
以上に詳細に本発明を説明する。The present invention is described in detail above.
従来の、前記出願人の開発した表面処理の考え方は、水
蒸気処理で素材を封孔して、ダクロタイズド処理を行
い、ダクロ処理の製法上残存する気孔をさらに水ガラス
又は樹脂でコーテイングするというものであつたが、さ
らに発展させコーテイングするものも非常に耐食性に優
れたものを使用すれば全体での耐食性はさらに一段と高
まる。Conventionally, the idea of the surface treatment developed by the applicant is to seal the material with steam treatment, perform dacrotized treatment, and coat the remaining pores in the production method of dacro treatment with water glass or resin. However, if the one to be further developed and coated has a very excellent corrosion resistance, the overall corrosion resistance will be further enhanced.
耐食性に優れた樹脂としては弗素系樹脂例えば四弗化エ
チレン樹脂等があげられる。Examples of resins having excellent corrosion resistance include fluorine-based resins such as tetrafluoroethylene resin.
第１図にその模式図を示す。図中、（１）は焼結鉄、
（２）は水蒸気処理膜（Fe3O4）、（３）は気孔、
（４）はダクロ皮膜、（５）はCr重合体、（６）はZn
片、（７）は空孔、（８）は弗素系樹脂膜である。The schematic diagram is shown in FIG. In the figure, (1) is sintered iron,
(2) is a steam treatment film (Fe 3 O 4 ), (3) is a pore,
(4) is a Dakuro film, (5) is a Cr polymer, (6) is Zn
One is a hole, (7) is a hole, and (8) is a fluorine-based resin film.
（作用） まず鉄系焼結材に弗素系樹脂をコーテイングして塩水噴
霧試験を施すと第１表に示す様に斑点状に赤錆が発錆し
てしまう。(Function) First, when a fluorine-based resin is coated on an iron-based sintered material and a salt water spray test is performed, red rust occurs in spots as shown in Table 1.
しかし、前処理として該焼結部品を水蒸気と水素を含む
雰囲気中で高温で処理して該焼結部品の表面に緻密な酸
化鉄被膜を形成せしめ表面層を封孔する処理いわゆる水
蒸気処理を施した後ダクロタイズド処理を施し、さらに
弗素系樹脂をコーテイングすると、著しく耐食性が上昇
する。 However, as pretreatment, the sintered part is treated at a high temperature in an atmosphere containing water vapor and hydrogen to form a dense iron oxide film on the surface of the sintered part to seal the surface layer, so-called steam treatment. After that, when the material is subjected to a dacrotized treatment and further coated with a fluorine resin, the corrosion resistance is remarkably increased.
これは、弗素系樹脂コーテイングが300〜400℃と高温で
処理するため通常の焼結材では内部の空孔中のガスがコ
ーテイング膜を破つて外に出るため、せつかくの処理膜
にブローホールが形成され望む耐食性が得られないのに
対して、水蒸気処理＋ダクロ処理を施すと、内部のガス
がこの処理の時に外に出てしまい、弗素系樹脂コーテイ
ングを欠陥なく形成させる事が可能となる。This is because the fluorine-based resin coating is processed at a high temperature of 300 to 400 ° C, so in ordinary sintered materials the gas in the internal pores breaks the coating film and goes out, so the blown holes in the treated film are blown out. While the desired corrosion resistance cannot be obtained due to the formation of steam, when steam treatment + dacro treatment is performed, the internal gas will come out during this treatment, and it will be possible to form the fluororesin coating without defects. Become.
又この前処理としては例えば樹脂含浸であると弗素系樹
脂の処理温度（300〜400℃）に耐えれないし、又一般的
に弗素系樹脂の前処理として燐酸マンガンあるいは燐酸
亜鉛処理もせいぜい200℃で分解するので、これらは弗
素系樹脂が被処理面にのりやすくするだけで耐食性には
寄与しない。As the pretreatment, for example, resin impregnation cannot withstand the treatment temperature of the fluororesin (300 to 400 ° C), and in general, pretreatment of the fluororesin with manganese phosphate or zinc phosphate is at most 200 ° C. Since they decompose, the fluorine-based resin does not contribute to the corrosion resistance but only makes it easy for the fluorine-based resin to be placed on the surface to be treated.
ところがダクロタイズド処理は、これも350℃程度で処
理するので、弗素系樹脂の処理を施してもさ程耐食性が
低下しない。However, since the dacrotized treatment is also performed at about 350 ° C., the corrosion resistance does not deteriorate so much even if the treatment with the fluororesin is performed.
よつてこれらを組み合わせる事により従来の一般的な水
蒸気処理＋ダクロダイズド処理＋樹脂又は水ガラスのコ
ーテイングよりもはるかに耐食性は向上する。Therefore, by combining these, the corrosion resistance is improved much more than the conventional general steam treatment + dacrodized treatment + coating of resin or water glass.
（実施例） 以下に本発明の実施例を述べる。(Examples) Examples of the present invention will be described below.
主としてFeから成る焼結鉄（ギヤー形状のもの）に次の
No.1、No.2、No.3のケースの表面処理を行つた。Sintered iron mainly composed of Fe (gear-shaped one)
Surface treatment of No. 1, No. 2 and No. 3 cases was performed.
ケースNo.1:水蒸気処理＋ダクロタイズド処理＋水ガラ
スコーテイング＋ワツクスコーテイング ケースNo.2:水蒸気処理＋ダクロタイズド処理＋弗素系
樹脂コーテイング を施してキヤス溶液のどぶ漬けによる耐食性試験を行つ
た。Case No. 1: Steam treatment + Dacrotized treatment + Water glass coating + Wax coating Case No. 2: Steam treatment + Dacrotized treatment + Fluorine-based resin coating was applied and corrosion resistance test was performed by immersing the cast solution.
この評価方法はJIS Z 2371の塩水噴霧試験よりも厳しい
キヤス試験JIS H 8681をさらに進めてキヤス試験溶液の
どぶ漬けで評価した。This evaluation method was carried out by further advancing the cast test JIS H 8681, which is stricter than the salt spray test of JIS Z 2371, and evaluated by immersing the cast test solution.
ちなみにケースNo.1の処理は通常の塩水噴霧試験では48
0Hrは十分に赤錆発生しない程度である。By the way, the treatment of case No. 1 is 48 in the normal salt spray test.
0Hr is such that red rust does not occur sufficiently.
結果は第１表で明らかな様に、ケースNo.1の処理ではす
でに72Hr後には皮膜が剥離し、240Hr後には完全に剥離
し、ギヤーの歯先が欠けている程腐食しているにもかか
わらず、ケースNo.2では72Hrでは若干赤錆が認められる
程度で、240Hr後でも皮膜の剥離はわずかであり、非常
に高い耐食性を示している。As the results are clear in Table 1, in case No. 1 treatment, the film was already peeled off after 72 hours, completely peeled off after 240 hours, and the tooth tip of the gear was corroded to the extent that it lacked. Regardless, in Case No. 2, a slight amount of red rust was observed at 72 hours, and even after 240 hours, peeling of the coating was slight, indicating extremely high corrosion resistance.
（発明の効果） 本発明により、従来の鉄系焼結材では考えられなかつた
様な耐食性を得る事ができた。これにより例えば自動車
の足まわりの部品（アンチロツクブレーキシステム用の
センサーリング等）の様に非常に耐食性を要求される所
を焼結により作製する事が可能となり、部品のコスト低
減により上記システム等の普及に貢献できる。又、この
処理により、焼結部品の適用範囲を著しく拡大させる。(Effects of the Invention) According to the present invention, it is possible to obtain a corrosion resistance unlike any conventional iron-based sintered material. This makes it possible to sinter parts that require extremely high corrosion resistance, such as parts around automobiles (sensor rings for anti-lock brake systems, etc.), and reduce the cost of parts to make the above systems, etc. Can contribute to the spread of. Also, this treatment significantly expands the range of application of sintered parts.
第１図は本発明の表面処理を行つた焼結部品の模式図を
例示している。 （１）……焼結体、（２）……水蒸気処理膜（Fe
3O2）、 （３）……気孔、（４）……ダクロ皮膜、（５）……Cr
重合体、 （６）……Zn片、（７）……空孔、（８）……弗素系樹
脂膜FIG. 1 exemplifies a schematic view of a sintered part subjected to the surface treatment of the present invention. (1) …… Sintered body, (2) …… Steam treatment film (Fe
3 O 2 ), (3) …… Porosity, (4) …… Dakuro film, (5) …… Cr
Polymer, (6) ... Zn piece, (7) ... Hole, (8) ... Fluorine resin film
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ２３Ｃ 22/24 26/00 Ａ 28/04 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location C23C 22/24 26/00 A 28/04
Claims (1)
焼結部品を水蒸気と水素を含む雰囲気中で処理して該焼
結部品の表面に緻密な酸化鉄皮膜を形成せしめ表面層を
封孔する処理を施し、その後該処理部品を亜鉛、アルミ
ニウムの１種または２種、６価クロム供給物質および該
物質に対する還元剤ならびに表面活性剤からなる混合物
が液状媒体中に分散した処理液に浸漬した後250℃〜400
℃で加熱し揮発成分を焼失せしめ焼結部品の表面に亜鉛
および／またはアルミニウムの粒子が３価クロム重合物
で囲まれた皮膜を形成させる処理を施し、さらに該処理
部品の表層部に弗素系樹脂の皮膜を形成させる処理を施
すことを特徴とする焼結部品の表面処理方法。1. In the surface treatment of an iron-based sintered component, first, the sintered component is treated in an atmosphere containing water vapor and hydrogen to form a dense iron oxide film on the surface of the sintered component. A treatment liquid in which a treatment for sealing is carried out, and then the treated component is dispersed in a liquid medium in which a mixture of one or two of zinc and aluminum, a hexavalent chromium supplying substance, a reducing agent for the substance and a surfactant is dispersed. After immersion 250 ℃ ~ 400
It is heated at ℃ to burn off the volatile components, and the surface of the sintered part is treated to form a film in which zinc and / or aluminum particles are surrounded by a trivalent chromium polymer. A surface treatment method for a sintered part, characterized by performing a treatment for forming a resin film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61250265A JPH0765182B2 (en) | 1986-10-20 | 1986-10-20 | Surface treatment method for sintered parts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61250265A JPH0765182B2 (en) | 1986-10-20 | 1986-10-20 | Surface treatment method for sintered parts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63103081A JPS63103081A (en) | 1988-05-07 |
| JPH0765182B2 true JPH0765182B2 (en) | 1995-07-12 |
Family
ID=17205317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61250265A Expired - Lifetime JPH0765182B2 (en) | 1986-10-20 | 1986-10-20 | Surface treatment method for sintered parts |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0765182B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3568568B2 (en) * | 1994-01-17 | 2004-09-22 | 本田技研工業株式会社 | Recycling method of aluminum alloy product scraps for automobiles |
| US6190464B1 (en) | 1998-09-24 | 2001-02-20 | Nisshin Steel Co., Ltd. | Chromating solution and chromated metal sheet |
| JP2009074114A (en) * | 2007-09-19 | 2009-04-09 | Hitachi Powdered Metals Co Ltd | Iron-based sintered material superior in corrosion resistance, fixing case for cylinder lock device made from the material, and method for manufacturing them |
| JP2021066945A (en) * | 2019-10-28 | 2021-04-30 | 株式会社クボタ | Engine exterior part, and manufacturing method thereof |
| CN117600466A (en) * | 2023-11-13 | 2024-02-27 | 迈格发(上海)科技股份有限公司 | A manufacturing process for rubber-coated sprockets |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4871431A (en) * | 1971-12-28 | 1973-09-27 | ||
| JPS52904A (en) * | 1975-06-24 | 1977-01-06 | Nichigou Asechiren Kk | Process for recovering activity of washing liquid for acetylene gas purification |
-
1986
- 1986-10-20 JP JP61250265A patent/JPH0765182B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63103081A (en) | 1988-05-07 |
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