JPS63176492A - Method for working aluminum-silicon alloy base material surface - Google Patents
Method for working aluminum-silicon alloy base material surfaceInfo
- Publication number
- JPS63176492A JPS63176492A JP659387A JP659387A JPS63176492A JP S63176492 A JPS63176492 A JP S63176492A JP 659387 A JP659387 A JP 659387A JP 659387 A JP659387 A JP 659387A JP S63176492 A JPS63176492 A JP S63176492A
- Authority
- JP
- Japan
- Prior art keywords
- base material
- plating
- aluminum
- iron
- phosphorus
- 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
- 239000000463 material Substances 0.000 title claims abstract description 34
- 229910000676 Si alloy Inorganic materials 0.000 title claims description 14
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 title claims description 13
- 238000000034 method Methods 0.000 title abstract description 16
- 238000007747 plating Methods 0.000 claims abstract description 53
- DPTATFGPDCLUTF-UHFFFAOYSA-N phosphanylidyneiron Chemical compound [Fe]#P DPTATFGPDCLUTF-UHFFFAOYSA-N 0.000 claims description 24
- 229910052782 aluminium Inorganic materials 0.000 claims description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 14
- 239000011856 silicon-based particle Substances 0.000 claims description 6
- 238000003672 processing method Methods 0.000 claims 1
- 238000005260 corrosion Methods 0.000 abstract description 17
- 230000007797 corrosion Effects 0.000 abstract description 17
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 9
- 229910052710 silicon Inorganic materials 0.000 abstract description 6
- 230000003746 surface roughness Effects 0.000 abstract description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 abstract description 2
- 229910017604 nitric acid Inorganic materials 0.000 abstract description 2
- 229910021364 Al-Si alloy Inorganic materials 0.000 abstract 3
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- 239000013078 crystal Substances 0.000 abstract 1
- 239000003792 electrolyte Substances 0.000 abstract 1
- 238000005498 polishing Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 239000011574 phosphorus Substances 0.000 description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- 229910001018 Cast iron Inorganic materials 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- 239000006061 abrasive grain Substances 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 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
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 235000003801 Castanea crenata Nutrition 0.000 description 1
- 244000209117 Castanea crenata Species 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000003483 aging Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- -1 copper and magnesium Chemical compound 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- OFNHPGDEEMZPFG-UHFFFAOYSA-N phosphanylidynenickel Chemical compound [P].[Ni] OFNHPGDEEMZPFG-UHFFFAOYSA-N 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Landscapes
- Electroplating Methods And Accessories (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、耐摩耗性及び耐食性を向上させるアルミニウ
ム−珪素合金表面の加工方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for processing the surface of an aluminum-silicon alloy to improve wear resistance and corrosion resistance.
（従来の技術）
数多くの基材は、その表面が耐摩耗性及び耐食性にすぐ
れていることが要求されるが、特に自動車などの内燃機
関のシリンダボアの摺動部分には高い耐摩耗性及び耐食
性が要求される。(Prior Art) The surface of many base materials is required to have excellent wear resistance and corrosion resistance, and in particular, the sliding parts of cylinder bores of internal combustion engines such as automobiles require high wear resistance and corrosion resistance. is required.
このシリンダポア特にシリンダブロックは、従来鋳鉄に
より製造されているが、最近では軽量化及び放熱性向上
のためにアルミニウム合金により多く製造ばれている。Cylinder pores, particularly cylinder blocks, have traditionally been made of cast iron, but recently they are often made of aluminum alloy to reduce weight and improve heat dissipation.
この場合、シリンダブロック本体は鋳造性の良い通常の
アルミニウム−珪素合金を使用し、摺動部分であるシリ
ンダ内壁には、慣用の鋳鉄製のシリンダライナを装入す
るか、あるいはニッケルまたはニッケルー燐をペースに
セラミック粒子を分散はせたものをめっきするか、ある
いは硬質クロムめっきするかして、シリンダ内壁の耐摩
耗性を商めている。In this case, the cylinder block body is made of an ordinary aluminum-silicon alloy with good castability, and the inner wall of the cylinder, which is the sliding part, is filled with a conventional cast iron cylinder liner or coated with nickel or nickel-phosphorus. The inner wall of the cylinder is made to have wear resistance by plating with ceramic particles dispersed in paste or by hard chrome plating.
また特公昭４３−８１７３号公報は、高珪素アルミニウ
ム合金（珪素含量約６ないし２０重量％）を使用してシ
リンダブロック内壁等を低摩擦性表面にする方法を開示
している。Further, Japanese Patent Publication No. 43-8173 discloses a method of making the inner wall of a cylinder block, etc., a low-friction surface using a high-silicon aluminum alloy (silicon content: about 6 to 20% by weight).
（発明が解決しようとする問題点）
シカシながら、シリンダブロックの材質を高珪素アルミ
ニウム合金とした場合は、その耐食性が慣用の鋳鉄製の
ものに比較して低く、腐食雰囲気下でのシリンダ内壁の
摩耗が早めという問題がある。(Problems to be Solved by the Invention) However, when the material of the cylinder block is made of high-silicon aluminum alloy, its corrosion resistance is lower than that of conventional cast iron, and the inner wall of the cylinder may deteriorate in a corrosive atmosphere. The problem is that it wears out quickly.
またアルミニウム合金のシリンダブロック内壁にニブケ
ルまたはニブケル−燐ベースにセラミック粒子を分散さ
せたもの、あるいは硬質クロムをめっきした場合には、
そのめっき層の耐摩耗性及び耐食性は鋳鉄の場合【比較
して飛躍的に向上するが、これと接触する相手材である
ピストンリング及びピストンの摩耗を増大させるという
問題が生じる。しかも硬質クロムめっきの場合、ピスト
ンリングとのスカフフが発生しやすいという問題もある
。In addition, when the inner wall of an aluminum alloy cylinder block is plated with Nibukel or Nibukel-phosphorus based ceramic particles dispersed, or hard chromium,
Although the wear and corrosion resistance of the plating layer is dramatically improved compared to that of cast iron, the problem arises that it increases the wear of the piston rings and pistons, which are the mating materials that come into contact with the plating layer. Moreover, in the case of hard chrome plating, there is also the problem that scuffing with the piston ring is likely to occur.
本発明は、上記の問題点を解決するためになされたもの
であシ、その目的とするところは特にシリンダブロック
またはシリンダライナ内壁の加工に有利である、耐摩耗
性及び耐食性を向上ζせるアルミニウム−珪素合金基材
表面の加工方法を提供することである。The present invention has been made to solve the above-mentioned problems, and its purpose is to improve wear resistance and corrosion resistance of aluminum, which is particularly advantageous for machining cylinder blocks or cylinder liner inner walls. - To provide a method for processing the surface of a silicon alloy substrate.
（問題点を解決するための手段）
本発明のアルミニウム−珪素合金基材表面の加工方法は
、アルミニウム−珪素合金よルなる基材の表面からアル
ミニウムを選択的に除去して珪素粒子を露出略せて表面
から突出；せた後に、この表面に鉄−燐めっきを施すこ
とを特徴とする。(Means for Solving the Problems) The method of processing the surface of an aluminum-silicon alloy base material of the present invention selectively removes aluminum from the surface of an aluminum-silicon alloy base material to avoid exposing silicon particles. It is characterized by applying iron-phosphorus plating to the surface after the surface is made to protrude from the surface.
本発明は、所望のアルミニウム−珪素合金よりなる基材
を鋳造後の表面の加工方法に関するものであるが、この
ときのアルミニウム−珪素合金は、珪素含量が約６ない
し２０重量％のものを使用し、所望によりアルミニウム
、珪素以外の金桐例えば銅、マグネシウム等を加えても
よく、好ましくは過共晶アルミニウム−珪素合金（珪素
含量１４ないし２０重量％）である。The present invention relates to a method for processing the surface of a base material made of a desired aluminum-silicon alloy after casting, and the aluminum-silicon alloy used at this time has a silicon content of about 6 to 20% by weight. However, metals other than aluminum and silicon, such as copper and magnesium, may be added if desired, and a hypereutectic aluminum-silicon alloy (silicon content of 14 to 20% by weight) is preferred.
また、基材表面からアルミニウムを選択的に除去する前
Ｋ、該表面を通常の機械加工仕上げ、例えばポーリング
加工やホーニング加工により表面のあらさを１μｍ 以
下としておくことが好ましい。Further, before selectively removing aluminum from the surface of the base material, it is preferable that the surface is subjected to a conventional mechanical finish such as poling or honing to a surface roughness of 1 μm or less.
基材表面からアルミニウムの選択的な除去は、電解研摩
により実施することが好ましいが他の方法例えば特殊な
ホーニング加工によっても可能である。この処理により
表面のあらさを１ないし６μｍ、好ましくは２ないし４
μｍとする。The selective removal of aluminum from the surface of the substrate is preferably carried out by electrolytic polishing, but other methods such as special honing are also possible. This treatment reduces the surface roughness to 1 to 6 μm, preferably 2 to 4 μm.
Let it be μm.
電解研摩は、電解液例えば柑り３またはＮａ ＮＯｓ中
に基材を浸漬し、液中に陰極を設置し、そして処理表面
を隣極として印加することにより行なう。Electrolytic polishing is carried out by immersing the substrate in an electrolytic solution such as Kuri 3 or Na NOs, placing a cathode in the solution, and applying the treated surface as an adjacent electrode.
また、特殊ホーニング加工は例えば鉱油中の粉末珪素Ａ
ｌｚＯｓ 、Ｍｙ２Ｓｉの懸濁液または分散液を使用し
て基材表面を研ぎ上げてアルミニウムを選択的に除去す
るものあるいは、弾力性のある砥石を用いたホーニング
加工である。In addition, special honing processing is possible, for example, using powdered silicon A in mineral oil.
This method involves selectively removing aluminum by polishing the surface of the substrate using a suspension or dispersion of lzOs or My2Si, or honing using an elastic grindstone.
アルミニウムを除去した後の基材表面に、次いで鉄−燐
めっきを行なうが、このとき基材表面は適度な凹凸を有
しているためこの凹部にめっきが侵入することにより、
めりき層は基材に強固に密着する。After the aluminum has been removed, iron-phosphorus plating is then applied to the surface of the base material, but at this time, since the surface of the base material has moderate irregularities, the plating penetrates into the recesses.
The plated layer firmly adheres to the base material.
鉄−燐めっきは、所望の組成からなるめっき浴を使用し
て行ない得るが、燐の含量が８重量％以上のめつき浴を
使用することにより、めっき層は特に耐食性にすぐれた
ものとなる。また鉄−燐めっき浴には、めっき特性を改
善するための他の添加剤例えば（ＮＨ４）、 ＳＯ２、
Ｈ，ＢＯ３等を加えても良い。Iron-phosphorus plating can be carried out using a plating bath with a desired composition, but by using a plating bath with a phosphorus content of 8% by weight or more, the plating layer will have particularly excellent corrosion resistance. . The iron-phosphorus plating bath also contains other additives to improve the plating properties, such as (NH4), SO2,
H, BO3, etc. may be added.
基材表面のめっき処理後、ざらにめっき層表面の凸部を
機械的に平滑だする処理を施こしても良い。これは特に
基材がシリンダブロックまたはシリンダライナである場
合、この処理はそれらの内壁を摺動するピストンリング
及びピストンの初期摩耗を低減させる。そしてこの処理
は、比較的砥粒が細かく、量の少ないホーニング砥石を
使用して行なうことが好ましい。After the plating treatment on the surface of the base material, a treatment may be performed to mechanically smooth out the rough convex portions on the surface of the plating layer. This is especially true if the substrate is a cylinder block or cylinder liner, this treatment reduces the initial wear of piston rings and pistons sliding on their inner walls. This treatment is preferably carried out using a honing stone with relatively fine abrasive grains and a small amount of abrasive grains.
（作 用）
本考案のアルミニウム−珪素合金基材表面の加工方法は
、基材表面にめっきを施す前の該表面よりアルミニウム
の選択的な除去により該表面に適度な凹凸が生じるため
、この面への鉄−燐めっき層を強固に密着ζせることが
できる。(Function) The method of processing the surface of an aluminum-silicon alloy base material of the present invention produces moderate unevenness on the surface by selectively removing aluminum from the surface before plating the base material surface. The iron-phosphorus plating layer can be firmly adhered to the surface.
まためっきを鉄−燐めっきとしたことてより耐摩耗性に
すぐれためつき層が得られる。さらに鉄−燐めっきは、
燐含量を調整することにより耐食性を付与することも可
能である。Furthermore, by using iron-phosphorus plating, a glazed layer with excellent wear resistance can be obtained. Furthermore, iron-phosphorus plating is
It is also possible to impart corrosion resistance by adjusting the phosphorus content.
また、適度な凹凸をもった鉄−燐めっきは、保油性に優
れる為、ピストン、ピストンリングとの摺動による摩耗
をより少なくするとともに１スカブフを生じることをな
くすることが可能となる。In addition, since iron-phosphorus plating with appropriate irregularities has excellent oil retention properties, it is possible to further reduce wear caused by sliding with the piston and piston ring, and to eliminate the occurrence of one scuff.
（実施例）
次に本発明の詳細な説明するが、本発明はこれに限定さ
れるものではない。(Example) Next, the present invention will be described in detail, but the present invention is not limited thereto.
シリンダブロック及びシリンダライナの内壁シリンダボ
ア加工過共晶のアルミニウム−珪素合金を使用してシリ
ンダブロック及びシリンダライナを鋳造後、各々の内壁
を荒仕上げ、中仕上げ及び仕上げボーリンダ加工し、次
に荒仕上げ及び仕上げホーニング加工し、次いでこの面
を本発明の方法に従りて加工する。Inner wall cylinder bore machining of cylinder block and cylinder liner After casting the cylinder block and cylinder liner using hypereutectic aluminum-silicon alloy, each inner wall is subjected to rough finishing, semi-finishing and finishing boring, then rough finishing and After finishing honing, this surface is then machined according to the method of the present invention.
第１図は各々の工程後の基材断面の状態を模式的に示す
説明図である。図中、１は基材、２は内壁、５は初晶珪
素粒子及び４は鉄−燐めっき層を表わす。FIG. 1 is an explanatory diagram schematically showing the state of the cross section of the base material after each step. In the figure, 1 is a base material, 2 is an inner wall, 5 is a primary silicon particle, and 4 is an iron-phosphorus plating layer.
前記仕上げホーニング後の状態を第１図（ａｌに示す。The state after the finish honing is shown in FIG. 1 (al).
この内壁２のあらさは１μｍ以下である。The roughness of this inner wall 2 is 1 μm or less.
次に電解研摩を下記の様に行ない内壁２表面のアルミニ
ウムを選択的に除去する。Next, electrolytic polishing is performed as described below to selectively remove aluminum on the surface of the inner wall 2.
電解液ＨＮＯ３（またはＮａＮＯ３）中に、前記ホーニ
ング加工したシリンダブロックまたはシリンダライナを
浸漬し、その内壁２を陽極、そして液中の８Ｕ８３ａａ
′＃を陰極として、常温、電流密度５ないし２ ｓＡ／
ｄｍｔで１０ないし１２０秒間印加する。なお、この電
解研摩処理の前後において通常の脱脂。The honed cylinder block or cylinder liner is immersed in an electrolytic solution HNO3 (or NaNO3), its inner wall 2 is used as an anode, and 8U83aa in the solution is immersed.
'# as a cathode, at room temperature, current density 5 to 2 sA/
dmt for 10 to 120 seconds. In addition, normal degreasing is performed before and after this electrolytic polishing treatment.
洗浄及び水洗を行なう。電解研摩後の内壁表面の状態を
第１図ｆｂｌに示す。アルミニウムが除去され珪素粒子
３が４出し、表面から突出している。この内壁２のあら
さは２ないし４μｍであり、次のめっきに好条件の凹凸
が形成されている。Wash and rinse with water. The condition of the inner wall surface after electrolytic polishing is shown in FIG. 1 fbl. Aluminum is removed and silicon particles 3 and 4 are exposed and protrude from the surface. The roughness of this inner wall 2 is 2 to 4 μm, and unevenness is formed that provides favorable conditions for subsequent plating.
また本実施例では電解研摩によりアルミニウムの除去を
行なったが、特殊ホーニング加工によシ行なっても良い
。Furthermore, although aluminum was removed by electrolytic polishing in this embodiment, it may also be removed by special honing.
次にアルミニウムを除去した内壁２に鉄−燐めっきを施
す。この鉄−燐めっきは、鉄成分とじて１） 塩化浴
ＦｅＣ７！２ ・’ｎＨ２Ｏ１６０２／／ 、 ｐＨ１
８（電流密度 ２０Ａ／ｄｍ” ）
ｉｉ） 混合浴ＦｅＣｅ２・ｈＨｔｏ １２０ｆ／７
、Ｆｅ３Ｏ４−７Ｈ，０５０ｔ／ｌ、ｐＨ１５（電流密
度 ３０Ａ／ｄｍ” ）
１１１）硫酸浴 ＦｅＳＯ４−７Ｈ２０２００９／／、
ｐＨ２，１（電流密度 １０Ａ／ａｍ”）
のいずれかに、燐成分としてＮａＨ２ＰＯ１・Ｈ，０、
ＮａＨｔ ＰＯｚ ・２ Ｈ！ ０１Ｈ３ＰＯ３等を０
．１ないし１６曽を加えて１）ないし１１１）に各々記
載した１１流密度にて行なう。さらにめっき特性を改善
する添加剤としてめっき浴にＩｄＮＨ４８０４１００ｐ
４ Ｈ３ＢＯ３２５ｔ／１等を加えても良い。Next, iron-phosphorus plating is applied to the inner wall 2 from which aluminum has been removed. This iron-phosphorus plating consists of 1) chloride bath as well as the iron component.
FeC7!2 ・'nH2O1602//, pH1
8 (Current density 20A/dm”) ii) Mixed bath FeCe2・hHto 120f/7
, Fe3O4-7H, 050t/l, pH 15 (current density 30A/dm") 111) Sulfuric acid bath FeSO4-7H202009//,
At pH 2.1 (current density 10 A/am"), NaH2PO1.H,0,
NaHt POz ・2 H! 01H3PO3 etc.
．． The process is carried out by adding 1 to 16 so and using the 11 flow densities described in 1) to 111), respectively. IdNH4804100p is added to the plating bath as an additive to further improve plating properties.
4 H3BO325t/1 etc. may be added.
このめっき後の状態を第１図（Ｃ）に示す。内壁２表面
に鉄−燐めりき膚４が形成されている。The state after this plating is shown in FIG. 1(C). An iron-phosphorus plated skin 4 is formed on the surface of the inner wall 2.
この鉄−燐めっき層４の厚さは約５０μｍである。The thickness of this iron-phosphorus plating layer 4 is approximately 50 μm.
またこの鉄−燐めっき層４は、電解研摩により生じた内
壁２の凹凸の凹部５にめっき成分が侵入するととＫより
しっかりと基材内壁２に密着している。Further, this iron-phosphorus plating layer 4 adheres more firmly to the inner wall 2 of the base material than K when the plating component enters the concave portion 5 of the unevenness of the inner wall 2 caused by electrolytic polishing.
このめっき後、鉄−燐めっき層４表面の凸部を、比較的
砥粒が細かいホーニング砥石少量でホーニング加工して
平滑にした。After this plating, the convex portions on the surface of the iron-phosphorus plating layer 4 were smoothed by honing using a small amount of a honing stone with relatively fine abrasive grains.
耐摩耗試験
以上の様に製造したシリンダブロック及びシリンダライ
ナの内壁の耐摩耗性を調べた。これは内壁に荷重を与え
たときの最初に焼付けを起こす荷重（焼付は限度荷重）
を求めることによ１行なった。本発明のものに加えて比
較のために同材質、同形状のシリンダブロックでホーニ
ング加工後直ちに鉄−燐めっきを施したもの（比較例１
）及び同様にホーニング加工後クロムめっきを施したも
の（比較例２）も同様の試、験を行なった。結果を第２
図に示す。Wear resistance test The abrasion resistance of the inner walls of the cylinder block and cylinder liner manufactured as described above was investigated. This is the load that causes seizure at the beginning when a load is applied to the inner wall (seizure is the limit load)
I did one line by asking for . In addition to the cylinder block of the present invention, for comparison, a cylinder block of the same material and shape was immediately iron-phosphorous plated after honing (Comparative Example 1)
) and a material similarly honed and then chromium plated (Comparative Example 2) were also subjected to similar tests. Second result
As shown in the figure.
これによると本発明によるシリンダブロック及びシリン
ダライナの内壁の耐摩耗性は、比較例１及び２に比べ顯
著に向上していることがわかる。This shows that the wear resistance of the inner walls of the cylinder block and cylinder liner according to the present invention is significantly improved compared to Comparative Examples 1 and 2.
耐食試験
次に鉄−燐めっきの際に燐含量を４．６，８．１２重量
チと変えてめっきを行ない、その各々のめつき層の耐食
性を調べた。これは試験サンプルを２．５％ＨＣ／水溶
液（中ｐＨ０７）中に浴温７０±１℃で２５分間浸漬し
た後に、試験サンプルへ腐食度を測定するものである。Corrosion Resistance Test Next, during iron-phosphorus plating, the phosphorus content was changed to 4.6 and 8.12% by weight, and the corrosion resistance of each plated layer was examined. This involves measuring the degree of corrosion on the test sample after immersing the test sample in a 2.5% HC/aqueous solution (medium pH 07) at a bath temperature of 70±1° C. for 25 minutes.
また比較のために前記比較例２のクロムめっきを施した
ものも同様に行なった。結果を第３図に示すが、これは
腐食による重量の減少量で示しである。For comparison, the chromium-plated sample of Comparative Example 2 was also subjected to the same process. The results are shown in Figure 3, which shows the amount of weight loss due to corrosion.
これによると本発明の鉄−燐めっき層は、燐含量を８重
量％以上としたとき、格段に耐食性が向上することがわ
かる。According to this, it can be seen that the iron-phosphorus plating layer of the present invention has significantly improved corrosion resistance when the phosphorus content is 8% by weight or more.
（発明の効果）
以上説明した様に本発明のアルミニウム−珪素合金基材
表面の加工方法は、基材表面にめっきを施す前に、その
面のアルミニウムを選択的に除去し、珪素粒子を露出さ
せて表面から突出させるため、適度な凹凸面が形成され
、この面への鉄−燐めっき層は、形成された凹部へ侵入
し、強固に基材に密着することＫより過酷な使用条件に
曝されても該めっき層がはがれることけない。(Effects of the Invention) As explained above, the method for processing the surface of an aluminum-silicon alloy base material of the present invention selectively removes aluminum on the surface of the base material before plating the surface, exposing silicon particles. In order to protrude from the surface, a moderately uneven surface is formed, and the iron-phosphorus plating layer on this surface penetrates into the formed recesses and firmly adheres to the base material. Even if exposed, the plating layer will not peel off.
また鉄−燐めっきは、すぐれた耐摩耗性を有するため、
従来のニブケル−燐めっきの様な時効硬化処理とか硬質
粒子の分散を必要としないため、工程を簡略化できる。In addition, iron-phosphorus plating has excellent wear resistance, so
The process can be simplified because it does not require age hardening treatment or dispersion of hard particles unlike conventional nibkel-phosphorus plating.
さらにこの鉄−燐めっきは、燐含量を調整することによ
り容易に耐食性を付与することも可能である。Furthermore, corrosion resistance can be easily imparted to this iron-phosphorus plating by adjusting the phosphorus content.
また適度な凹凸をもった鉄−燐めっき面は保油性にすぐ
れるため、例えばピストン、ピストンリングとの摺動に
おいて容易に油膜を形成するので焼付くことがなく摩耗
もより少くなる。In addition, since the iron-phosphorus plated surface with appropriate irregularities has excellent oil retention properties, it easily forms an oil film when sliding with, for example, a piston or a piston ring, thereby preventing seizure and reducing wear.
これらのことから、本発明の方法は、シリンダブロック
またはシリンダライナの内壁の加工に適しているといえ
る。シリンダブロックまたはシリンダライナの使用され
る環境条件は通常−３０ないし１８０℃と大幅に変化す
る。このため従−来は基材とめっき層またはシリンダラ
イナとの熱膨張率の差が大きいと熱変形としての膨張、
収縮過程で両者の界面においてフレツティング摩耗が生
じたり、めっき層に大きなりラブクが発生し、これによ
りめっき層表面に新たに形成される凸部によりピストン
リングスカッフまたはピストンスカブフを発生していた
。これに対し本発明によるものでは、基材とめつき層と
の熱膨張率の差は同様に大きいが、めっき層は基材に強
固て密着しているため、両者の界面ですべりを起こすこ
とはない。さらに熱変形に伴なう応力により、めっき層
にクラックは発生するが、非常に細かいものであるため
、このクラックは応力を緩和するという特徴を有し、従
来のような問題を発生することはない。From these facts, it can be said that the method of the present invention is suitable for processing the inner wall of a cylinder block or cylinder liner. The environmental conditions in which cylinder blocks or cylinder liners are used vary widely, typically from -30°C to 180°C. For this reason, conventionally, if there is a large difference in thermal expansion coefficient between the base material and the plating layer or cylinder liner, expansion due to thermal deformation,
During the shrinkage process, fretting wear occurred at the interface between the two, and large rubs occurred in the plating layer, resulting in piston ring scuff or piston scuff due to newly formed protrusions on the surface of the plating layer. . On the other hand, in the case of the present invention, although the difference in thermal expansion coefficient between the base material and the plating layer is similarly large, since the plating layer is firmly adhered to the base material, slippage does not occur at the interface between the two. do not have. Furthermore, cracks occur in the plating layer due to the stress associated with thermal deformation, but since they are very small, these cracks have the characteristic of relieving stress, and the problems that occur in the past do not occur. do not have.
第１図（ａ）ないしくｃ）は本発明の一実施例の各工程
後の基材断面の状態の説明図であり、第１図（ａ）は電
解研摩前、＠１図（ｂ）は電解研摩後、第１図（ｃ）け
鉄−燐めっき後の状態を表わし、第２図は、本発明の一
実施例の耐摩耗性を比較例と対比して示すグラフ、そし
て
第３図は、本発明の一実施例の耐食性を比較例と対比し
て示すグラフを表わす。
図中、
１・・・基材 ２・・・内壁３・初晶珪素粒
子 ４・・鉄−燐めっき層５・・・凹部
特許出願人 トヨタ自動車株式会社
（ｔより）２名）
第１図
第２図
実７！ｆＰＪ 比較例１ 比較９′ｌＪ２第３図
燐量４”７． ６”／、 ８”７． １？／、 比
較例２実施例Figures 1 (a) to c) are explanatory diagrams of the state of the cross section of the base material after each step in an embodiment of the present invention, and Figure 1 (a) is before electrolytic polishing, @ Figure 1 (b) 1(c) represents the state after electrolytic polishing and iron-phosphorus plating, FIG. 2 is a graph showing the wear resistance of one embodiment of the present invention in comparison with a comparative example, and FIG. The figure represents a graph showing the corrosion resistance of an example of the present invention in comparison with a comparative example. In the figure, 1... Base material 2... Inner wall 3 - Primary silicon particles 4... Iron-phosphorus plating layer 5... Concave portion Patent applicant: Toyota Motor Corporation (2 people from T) Figure 1 Figure 2, fruit 7! fPJ Comparative Example 1 Comparison 9'lJ2 Figure 3 Phosphorus amount 4"7.6"/, 8"7.1?/, Comparative Example 2 Example
Claims (1)
ニウムを選択的に除去して珪素粒子を露出させて表面か
ら突出させた後に、この表面に鉄−燐めっきを施すこと
を特徴とするアルミニウム−珪素合金基材表面の加工方
法。An aluminum-silicon alloy characterized in that aluminum is selectively removed from the surface of a base material made of an aluminum-silicon alloy to expose silicon particles so that they protrude from the surface, and then iron-phosphorus plating is applied to the surface. Processing method of base material surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP659387A JPS63176492A (en) | 1987-01-14 | 1987-01-14 | Method for working aluminum-silicon alloy base material surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP659387A JPS63176492A (en) | 1987-01-14 | 1987-01-14 | Method for working aluminum-silicon alloy base material surface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63176492A true JPS63176492A (en) | 1988-07-20 |
Family
ID=11642631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP659387A Pending JPS63176492A (en) | 1987-01-14 | 1987-01-14 | Method for working aluminum-silicon alloy base material surface |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63176492A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50148236A (en) * | 1974-05-21 | 1975-11-27 | ||
| JPS619597A (en) * | 1984-06-25 | 1986-01-17 | Toyota Motor Corp | Plating method of aluminum piston |
-
1987
- 1987-01-14 JP JP659387A patent/JPS63176492A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50148236A (en) * | 1974-05-21 | 1975-11-27 | ||
| JPS619597A (en) * | 1984-06-25 | 1986-01-17 | Toyota Motor Corp | Plating method of aluminum piston |
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