JP2712808B2 - Method for improving corrosion resistance of hard chrome plating film - Google Patents
Method for improving corrosion resistance of hard chrome plating filmInfo
- Publication number
- JP2712808B2 JP2712808B2 JP26998190A JP26998190A JP2712808B2 JP 2712808 B2 JP2712808 B2 JP 2712808B2 JP 26998190 A JP26998190 A JP 26998190A JP 26998190 A JP26998190 A JP 26998190A JP 2712808 B2 JP2712808 B2 JP 2712808B2
- Authority
- JP
- Japan
- Prior art keywords
- plating film
- corrosion resistance
- polishing
- crack
- rust
- 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 - Fee Related
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- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Electroplating Methods And Accessories (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、摺動部品の耐摩耗性を付与するために施さ
れる硬質クロムめっき皮膜の耐蝕性向上方法に関する。Description: TECHNICAL FIELD The present invention relates to a method for improving the corrosion resistance of a hard chromium plating film applied to impart abrasion resistance of a sliding component.
［従来の技術］ 従来、摺動部品は耐摩耗性を付与するために鉄系素地
上に硬質クロムめっきが施されている。この摺動部品が
腐蝕性の環境に置かれた場合、硬質クロムめっき皮膜に
存在するクラック中に腐蝕因子（たとえば、塩水など）
が第６図の模式図に示すような貫通クラックを通り素地
面まで浸透し錆などの腐蝕を発生する。特に硬質陽極酸
化法によるクロムめっき皮膜には表面には微細なクラッ
クが存在し、そのクラックは表面側が開口しており腐蝕
因子が浸透しやすい。そのため素材腐蝕となりやすい。[Prior art] Conventionally, hard chrome plating is applied to an iron-based substrate to impart abrasion resistance to a sliding component. If this sliding part is placed in a corrosive environment, corrosion factors (eg, salt water, etc.) will appear in the cracks present in the hard chromium plating film.
Penetrates through the cracks as shown in the schematic view of FIG. 6 to the bare ground, and causes corrosion such as rust. In particular, fine cracks are present on the surface of the chromium plating film formed by the hard anodic oxidation method, and the cracks are open on the surface side, so that corrosion factors easily penetrate. Therefore, the material is susceptible to corrosion.
この硬質クロムめっき皮膜の耐蝕性向上の手段として
は、めっき皮膜の厚膜化、めっき皮膜のマイクロク
ラック化、めっき皮膜と素地との間にニッケルの中間
層を設けるなどの方法が知られている。As means for improving the corrosion resistance of the hard chromium plating film, there are known methods such as increasing the thickness of the plating film, microcracking the plating film, and providing an intermediate layer of nickel between the plating film and the substrate. .
上記のめっき皮膜の厚膜化は、めっき処理時間が長
くなり生産性の低下、コストアップにつながり好ましく
ない。また、上記のめっき皮膜のマイクロクラック化
は、マイクロクラック化によるクラックの多層化では貫
通クラックの発生を完全に防止することは困難であり貫
通クラック部位が錆の発生点となる。さらに、上記の
めっき皮膜と素地との間にニッケルの中間層を設けるこ
とは、工数が増えコストアップとなるので好ましくな
い。Increasing the thickness of the above-mentioned plating film is undesirable because it leads to a longer plating process time and lowers productivity and increases costs. Further, in the above-described micro-cracking of the plating film, it is difficult to completely prevent the generation of through cracks in the case of multi-layering of cracks by micro-cracking, and the portion of the through crack becomes a rust generation point. Further, providing a nickel intermediate layer between the plating film and the substrate is not preferable because it increases the number of steps and increases the cost.
［発明が解決しようとする課題］ 本発明は上記の事情に鑑みてなされたもので、硬質ク
ロムめっき皮膜の仕上げ研磨条件を検討することによ
り、めっき表面に研磨加工層を形成し低いコストで高耐
蝕性を有する硬質クロムめっき皮膜とすることを目的と
する。[Problems to be Solved by the Invention] The present invention has been made in view of the above circumstances, and by examining the finish polishing conditions of a hard chromium plating film, a polished layer is formed on the plating surface to achieve high cost at a low cost. It is intended to provide a hard chromium plating film having corrosion resistance.
［課題を解決するための手段］ 本願の第１の発明は、鉄系素材上に形成される硬質ク
ロムめっき皮膜の耐蝕性向上方法であって、該鉄系素材
上に形成されたクラック密度が300本/cm以上の該硬質ク
ロムめっき皮膜に対して研磨によるめっき皮膜の研磨量
を△ｔ、めっき直後の皮膜表面の最大粗さ値をRmaxとし
た場合、△t/Rmax f≧２となるように超仕上げ研磨をお
こなうことを特徴とする。[Means for Solving the Problems] The first invention of the present application is a method for improving the corrosion resistance of a hard chromium plating film formed on an iron-based material, wherein the crack density formed on the iron-based material is reduced. Δt / Rmax f ≧ 2, where Δt is the polishing amount of the plating film by polishing the hard chrome plating film of 300 lines / cm or more and Rmax is the maximum roughness value of the coating surface immediately after plating. It is characterized by performing super finish polishing as described above.
ただし、以下△t/Rmaxをｆとして説明する。 However, the following description will be made assuming that Δt / Rmax is f.
本願の第２の発明は、鉄系素材上に形成される硬質ク
ロムめっき皮膜の耐蝕性向上方法であって、該鉄系素材
上に形成されたクラック密度が580本/cm以上の該硬質ク
ロムめっき皮膜に対して研磨によるめっき皮膜の研磨量
を△ｔ、めっき直後の皮膜表面の最大粗さ値をRmaxとし
た場合、△t/Rmax f≧１となるように超仕上げ研磨をお
こなうことを特徴とする。The second invention of the present application is a method for improving the corrosion resistance of a hard chromium plating film formed on an iron-based material, wherein the hard chromium plating film formed on the iron-based material has a crack density of 580 / cm or more. When the amount of polishing of the plating film by polishing the plating film is Δt, and the maximum roughness value of the coating surface immediately after plating is Rmax, super finish polishing is performed so that Δt / Rmax f ≧ 1. Features.
鉄系素地上に形成された直後の硬質クロムめっき皮膜
には、通常第３図（ａ）に示すように表面２に微細なク
ラックが存在している。そしてなかにはめっき皮膜５を
貫通する貫通クラック１が存在する。この表面のクラッ
クを超仕上げ研磨を特定条件でおこなうことにより第３
図（ｂ）に示すように平滑にし、クラックに封孔部４を
もつ研磨加工層３を形成することにできる。これにより
腐蝕因子がめっき皮膜５中に浸透するのを防ぎ素材６の
耐蝕性を向上させることができる。The hard chromium plating film immediately after being formed on the iron-based substrate usually has fine cracks on the surface 2 as shown in FIG. 3 (a). In addition, there is a through crack 1 penetrating through the plating film 5. This surface crack can be reduced to a third by performing super finish polishing under specific conditions.
As shown in FIG. 2B, the polishing layer 3 having smoothness and having a sealing portion 4 in a crack can be formed. This can prevent the corrosion factor from penetrating into the plating film 5 and improve the corrosion resistance of the material 6.
この際研磨加工層３でクラックを封孔するには、クロ
ムめっき皮膜５のクラック密度と、めっき皮膜表面２の
粗さが関係する。そこで表面２の粗さ値が大きい場合に
は超仕上げ研磨量を多くしなければ表面が平滑とならな
い。その結果腐蝕因子を表面に保持することとなりめっ
き皮膜５中への浸透の機会を高めることとなり好ましく
ない。またクラックを封孔するためには、クラックの溝
幅の大きさが関係し大きい場合は研磨量を多くしてもク
ラックの封孔が困難である場合が多い。そこで超仕上げ
研磨の条件と、めっき皮膜のクラック密度に基づいてめ
っき皮膜研磨のかかり具合（クラックの封孔能力）を評
価するためにｆ値を尺度として設定した。ｆ＝△t/Rmax
なお、式中△ｔはめっき皮膜の研磨したときの皮膜の研
磨量を、Rmaxはめっき直後の皮膜表面の最大粗さ値を表
す。At this time, in order to seal the cracks in the polishing layer 3, the crack density of the chromium plating film 5 and the roughness of the plating film surface 2 are related. Therefore, when the roughness value of the surface 2 is large, the surface will not be smooth unless the amount of superfinishing is increased. As a result, the corrosion factor is retained on the surface, and the chance of penetration into the plating film 5 is increased, which is not preferable. In addition, in order to seal a crack, when the size of the groove width of the crack is related and large, it is often difficult to seal the crack even if the polishing amount is increased. Therefore, the f-value was set as a scale in order to evaluate the degree of polishing of the plating film (the crack-sealing ability) based on the conditions of the super-finishing polishing and the crack density of the plating film. f = △ t / Rmax
In the formula, Δt represents the polishing amount of the plating film when the plating film is polished, and Rmax represents the maximum roughness value of the coating surface immediately after plating.
この関係を第１図および第２図の模式図に示す。 This relationship is shown in the schematic diagrams of FIG. 1 and FIG.
すなわち、クラック密度が、たとえば300本/cm以上で
あるときは、第１図に示すようにめっき皮膜表面の最大
粗さRmaxに対して、充分な皮膜の研磨量△ｔがあるｆ≧
２の場合には、めっき皮膜全面に均一な研磨がかかり表
面クラックを封孔した研磨加工層３の形成が期待でき
る。That is, when the crack density is, for example, 300 or more / cm, there is a sufficient film polishing amount Δt with respect to the maximum roughness Rmax of the plating film surface as shown in FIG.
In the case of No. 2, the formation of the polished layer 3 in which the entire surface of the plating film is uniformly polished and the surface cracks are sealed can be expected.
ところが第２図に示すようにめっき皮膜の表面の最大
粗さRmaxに対して、充分な皮膜の研磨量△ｔがないｆ＜
２の場合は、皮膜の表面全面に均一な研磨加工層３が形
成できず、クラックの封孔部ができないものが残存す
る。その結果、腐蝕因子がめっき皮膜５中に貫通クラッ
ク１から浸透し、めっき皮膜５による耐蝕性が向上しな
い。このためクラック密度が300本/cm以上であるとき
は、ｆ値は２以上であることが必要である。However, as shown in FIG. 2, for the maximum roughness Rmax of the surface of the plating film, there is no sufficient amount of film polishing Δt f <
In the case of No. 2, a uniform polished layer 3 cannot be formed on the entire surface of the film, and some of which cannot form a crack sealing portion remain. As a result, the corrosion factor penetrates into the plating film 5 from the through cracks 1 and the corrosion resistance of the plating film 5 is not improved. For this reason, when the crack density is 300 or more / cm, the f-value needs to be 2 or more.
この場合クラック密度が小さいとクラックの数が少な
くクラック自体が大きく開口の溝幅は大きくなる。逆に
密度が大きいとクラックの数が多くなりクラック自体が
細かくなり開口も小さく溝幅は細くなる。In this case, when the crack density is low, the number of cracks is small and the cracks themselves are large and the groove width of the opening is large. Conversely, when the density is high, the number of cracks increases, the cracks themselves become finer, the openings become smaller, and the groove width becomes narrower.
そこで、たとえば、めっき皮膜５のクラック密度が58
0本/cm未満であるとクラック幅が太くなるため、超仕上
げ研磨加工をｆ＜１と少なくすると研磨が不十分でクラ
ックの封孔ができず錆が発生するので好ましくない。ク
ラック密度が580本/cm以上あればクラック幅が細くなる
ためｆ＝１の加工量であってもクラックの溝幅が狭くな
っているため充分クラックの封孔部ができ錆の発生が防
止できる。したがって、クラック密度が580本/cm以上あ
ればｆ値が１以上の仕上げ研磨加工によるクラック封孔
が充分おこなえ、確実に防錆力が向上する。Therefore, for example, the crack density of the plating film 5 is 58
If it is less than 0 / cm, the crack width becomes large, and if the super-finishing polishing is reduced to f <1, the polishing is insufficient, the pores cannot be sealed, and rust is generated, which is not preferable. If the crack density is 580 / cm or more, the crack width becomes narrow, and even if the processing amount is f = 1, the crack groove width is narrow, so that the crack can be sufficiently sealed and the rust can be prevented. . Therefore, if the crack density is 580 / cm or more, the cracks can be sufficiently sealed by the finish polishing process with the f-value of 1 or more, and the rust prevention power is surely improved.
したがって、めっき皮膜５のクラック密度が300本/cm
以上の時は、ｆ値を２以上とし、めっき皮膜５のクラッ
ク密度が580本/cm以上の時は、ｆ値を１以上とすること
によりクラックの封孔が可能となる。Therefore, the crack density of the plating film 5 is 300 / cm.
In the above cases, the f-value is set to 2 or more, and when the crack density of the plating film 5 is 580 / cm or more, the f-value is set to 1 or more, whereby the crack can be sealed.
この研磨は、公知の超仕上装置を使用することにより
おこなうことができる。This polishing can be performed by using a known super finishing device.
その超仕上げは、砥石による精密仕上げ法の一種で、
円筒外面に、粒度のこまかい結合度の弱い角状砥石を低
い圧力で押付け、工作物に回転を与えると同時に砥石に
振動をあたえて能率よく極めて平滑な鏡面を得る方法で
ある。超仕上げ面は粗さが小さく、加工変質層も少な
く、また多方向切削のため仕上げ面は無方向性で耐摩耗
性に優れ、耐蝕性にすぐれた仕上げ面が得られる。ま
た、この超仕上げ法はワークの回転・砥石の往復摺動運
動のため研削軌跡が曲線的で一方向に限定されていない
ため二次元的なネットワーク形状の表面クラックに対し
て研磨を効果的に施しやすい。さらにバフ研磨と比較
し、△ｔを大きくできｆ値を大きくすることができる。The super finishing is a kind of precision finishing method using a whetstone,
In this method, a square grindstone having a small degree of bonding and a small degree of bonding is pressed against the outer surface of the cylinder at a low pressure, and the workpiece is rotated while simultaneously applying vibration to the grindstone to obtain an extremely smooth mirror surface with high efficiency. The super-finished surface has a small roughness and a small number of deteriorated layers, and the finished surface is non-directional and excellent in abrasion resistance due to multi-directional cutting, resulting in a finished surface with excellent corrosion resistance. In addition, this super-finishing method effectively grinds two-dimensional network-shaped surface cracks because the grinding locus is not limited to one direction due to the rotation of the work and the reciprocating sliding movement of the grinding wheel. Easy to apply. Further, compared with buff polishing, Δt can be increased and f-number can be increased.
［作用］ 本発明の耐蝕性向上方法は、めっき皮膜のクラックの
開口の溝幅の状態、クラック密度に基づいて超仕上げ加
工の研磨量を変え、表面の研磨加工層を形成してクラッ
ク開口の溝の封孔をおこなう。すなわち、クラック密度
に対応して定義したｆ値に基づいた超仕上げ研磨をおこ
なう。その結果めっき皮膜中には腐蝕因子が素地面に浸
透するような貫通クラックがなくなり硬質クロムめっき
皮膜で被覆された鉄系素地の耐蝕性を一段と高めること
ができる。[Action] The method for improving corrosion resistance of the present invention is to change the polishing amount of the superfinishing process based on the state of the groove width of the opening of the crack in the plating film and the crack density, to form a polished layer on the surface, and Seal the groove. That is, super-finishing is performed based on the f-number defined corresponding to the crack density. As a result, there are no penetrating cracks in the plating film that cause the corrosion factor to penetrate into the substrate, and the corrosion resistance of the iron-based substrate covered with the hard chromium plating film can be further improved.
［実施例］ 以下、実施例により具体的に説明する。[Examples] Hereinafter, specific examples will be described.
（実施例１） ショックアブソーバー、ピストンロッドなどの鉄系素
材６の上に形成された硬質クロムめっき皮膜５について
この耐蝕性向上方法をおこなった。(Example 1) This method of improving corrosion resistance was performed on a hard chromium plating film 5 formed on an iron-based material 6 such as a shock absorber and a piston rod.
クロムめっき皮膜５の膜厚30μｍ、クラック密度600
本/cmの試験片を用い、超仕上げ研磨をおこないその研
磨の度合の尺度のｆ値と錆発生点数との関係を調べた。
結果を第４図に示す。図中●が塩水噴霧（濃度５％の食
塩水、ノズル空気圧0.8〜1.3kgf/cm2 温度35℃ 湿度9
5〜98％）96時間経過度の腐蝕を、○が塩水噴霧500時間
経過後の錆発生点数である。なお、錆発生点数を測定し
た素地面積は100cm2である。ｆ値が大きくなると錆の発
生が少なく耐蝕性が向上していることを示している。Chromium plating film thickness 30μm, crack density 600
Using a test piece having a size of 1 cm / cm, superfinishing was performed, and the relationship between the f value of the scale of the degree of polishing and the number of rust occurrence points was examined.
The results are shown in FIG. In the figure, ● is a salt spray (saline with a concentration of 5%, nozzle air pressure 0.8 to 1.3 kgf / cm 2 temperature 35 ° C humidity 9
(5 to 98%) Corrosion at 96 hours, and ○ indicates the number of rust points after 500 hours of salt spray. The base area measured for the number of rust points was 100 cm 2 . When the f-number increases, it indicates that the generation of rust is small and the corrosion resistance is improved.
ｆ値が０＜ｆ＜１の範囲ではｆ値が大きくなるにつれ
て耐蝕性は向上するが錆の発生は多い。When the f-value is in the range of 0 <f <1, the corrosion resistance is improved as the f-value increases, but rust often occurs.
ｆ値が１≦ｆ＜２の範囲ではｆ値が大きくなるにつれ
て耐蝕性は向上し錆の発生はほとんど阻止できる。した
がって、クラック密度が580本/cm以上の本実施例ではｆ
≧１の条件で超仕上げ研磨をおこなえば防錆性が向上す
る。When the f value is in the range of 1 ≦ f <2, as the f value increases, the corrosion resistance improves, and the generation of rust can be almost prevented. Therefore, in the present embodiment where the crack density is 580 / cm or more, f
If super-finishing polishing is performed under the condition of ≧ 1, rust resistance is improved.
ｆ値を大きすれば耐蝕性は向上するが、そのためには
超仕上げ研磨の削り代を多くすることとなり、砥石の消
耗が速くなり、また加工時間が長くなる。したがって、
通常の環境下で使用する場合の硬質クロムめっき皮膜で
は、ｆ≧１の特にｆ＝１近傍でおこなうのが耐蝕性と生
産性のバランスのとれた値である。If the f-value is increased, the corrosion resistance is improved, but for that purpose, the cutting allowance of the super-finishing polishing is increased, the consumption of the grindstone is increased, and the processing time is lengthened. Therefore,
In a hard chromium plating film used under a normal environment, the value of f ≧ 1 and especially near f = 1 is a value that balances corrosion resistance and productivity.
（実施例２） めっき皮膜５の作製条件を変えて鉄系素材６にクラッ
ク密度の異なる硬質クロムめっき皮膜５を作製した。そ
して超仕上げ研磨のｆ値を変えた条件でおこないその防
錆性を調べた。(Example 2) Hard chromium plating films 5 having different crack densities were formed on iron-based material 6 by changing the preparation conditions of plating film 5. Then, the super-finish polishing was performed under different f-values, and the rust prevention was examined.
硬質クロムめっき条件:a、ケイフッ化浴 60℃ 80A/
dm2クラック密度200本/cm、b,HEEF25浴（日本Ｍ＆Ｔ社
製） 60℃ 100A/dm2クラック密度400本/cm、c,HEEF25
浴（日本Ｍ＆Ｔ社製） 60℃ 70A/dm2クラック密度600
本/cm、d,HEEF25浴（日本Ｍ＆Ｔ社製） 55℃ 50A/dm2
クラック密度800〜1000本/cm、e,ケイフッ化浴 50℃
50A/dm2クラック密度300本/cm、なお、クラック密度は
光学顕微鏡（マイクロスコープ、100〜500倍）を使用し
た表面観察により算出した。Hard chrome plating conditions: a, Fluorosilicate bath 60 ℃ 80A /
dm 2 crack density 200 / cm, b, HEEF25 bath (manufactured by Japan M & T) 60 ℃ 100A / dm 2 crack density 400 / cm, c, HEEF25
Bath (M & T Japan) 60 ℃ 70A / dm 2 Crack density 600
Book / cm, d, HEEF25 bath (manufactured by M & T Japan) 55 ℃ 50A / dm 2
Crack density 800-1000 / cm, e, Fluorosilicate bath 50 ℃
50A / dm 2 crack density 300 lines / cm, In addition, the crack density was calculated by surface observation using an optical microscope (microscope 100-500 times).
各めっき皮膜（ａ〜ｅ）について超仕上げ研磨をｆ＝
２、ｆ＝１、ｆ＝0.5の条件でおこない、その後塩水噴
霧を96時間おこなった後の錆の発生点数により評価し
た。評価面積は150cm2である。Super finishing polishing for each plating film (ae)
2, f = 1, f = 0.5, and then evaluated by the number of rusting points after spraying with salt water for 96 hours. The evaluation area is 150 cm 2 .
第５図にはクラック密度と錆発生点数との関係のグラ
フに示す。なお○印の曲線はｆ＝２、●印の曲線はｆ＝
１、◎印の曲線はｆ＝0.5である。FIG. 5 is a graph showing the relationship between the crack density and the number of rust occurrence points. Note that the curve marked with ○ is f = 2, and the curve marked with ● is f =
1, the curve marked with ◎ is f = 0.5.
クラック密度が580本/cm以上の場合は、ｆ≧１であれ
ば錆の発生は認められない。しかしｆ＝0.5の場合には1
5点以上の錆が発生し超仕上げ研磨が不十分であること
を示している。また、クラック密度が580本/cm以下の場
合で、ｆ＝１の研磨では錆の発生が認められクラックの
封孔が不完全であり超仕上げ研磨が不十分であることを
示している。クラック密度が300本/cm以上の場合は、ｆ
≧２であれば錆の発生は認められない。クラック密度が
200本/cmとなると、研磨がｆ＝２であっても錆の発生が
認められクラックの封孔が不完全であり超仕上げ研磨が
不十分であることを示している。When the crack density is 580 / cm or more, no rust is observed if f ≧ 1. However, when f = 0.5, 1
Rust of 5 points or more was generated, indicating that super finish polishing was insufficient. Further, when the crack density was 580 / cm or less, rust was observed in the polishing at f = 1, indicating that the crack was incompletely sealed and the super finish polishing was insufficient. If the crack density is 300 / cm or more, f
If ≧ 2, no rust is observed. Crack density
When the number is 200 / cm, rust is observed even when the polishing is f = 2, indicating that the cracks are incompletely sealed and the superfinishing is insufficient.
［効果］ 本発明の耐蝕性向上方法によれば、めっき皮膜の表面
クラックの溝を超仕上げ研磨により研磨加工層を形成し
てクラックを封孔することができる。その結果、表面の
クラックからの腐蝕因子の浸透により錆などの素地腐蝕
の発生が抑制できる。したがって、耐蝕性の向上した硬
質クロムめっき皮膜が形成された鉄系素材の部品とする
ことができる。[Effects] According to the method for improving corrosion resistance of the present invention, the cracks can be sealed by forming a polished layer by superfinishing the grooves of the surface cracks of the plating film. As a result, it is possible to suppress the occurrence of base corrosion such as rust due to penetration of corrosion factors from surface cracks. Therefore, it is possible to obtain a component made of an iron-based material on which a hard chromium plating film having improved corrosion resistance is formed.
めっき皮膜のクラック密度を大きくすれば、クラック
は小さくなりクラックの溝幅が小さくなる。そのため超
仕上げ研磨のｆ値を小さくできる。そのためクラック密
度の大きい硬質クロムめっき皮膜が形成できれば超仕上
げの研磨量を少なくして耐蝕性を向上させることができ
る。そして生産を高めて低いコストで耐蝕性を向上させ
ることができる。If the crack density of the plating film is increased, the crack becomes smaller and the groove width of the crack becomes smaller. Therefore, the f-number of the super finish polishing can be reduced. Therefore, if a hard chromium plating film having a large crack density can be formed, the amount of superfinishing can be reduced and the corrosion resistance can be improved. And the corrosion resistance can be improved at a low cost by increasing the production.
第１図および第２図ははｆ値の内容を説明する模式図
で、第１図はｆ＞１の場合、第２図はｆ＜１の場合、第
３図はめっき皮膜の研磨加工層の形成を示す模式図であ
り（ａ）は超仕上げ研磨前、（ｂ）は超仕上げ研磨後、
第４図は実施例１のｆ値と錆発生点数との関係を示すグ
ラフ、第５図は実施例２のクラック密度と錆発生点数と
の関係を示すグラフ、第６図はめっき皮膜の腐蝕を説明
する模式図である。 １……貫通クラック ２……めっき皮膜表面の粗さ ３……めっき皮膜表面の研磨加工層 ４……クラックの封孔部 ５……硬質クロムめっき皮膜 ６……鉄系素材1 and 2 are schematic diagrams for explaining the contents of the f-value. FIG. 1 shows a case where f> 1, FIG. 2 shows a case where f <1, and FIG. It is a schematic diagram which shows formation of (a) before super finish polishing, (b) after super finish polishing,
FIG. 4 is a graph showing the relationship between the f value of Example 1 and the number of rust occurrence points, FIG. 5 is a graph showing the relationship between the crack density and the number of rust occurrence points of Example 2, and FIG. 6 is the corrosion of the plating film. FIG. DESCRIPTION OF SYMBOLS 1 ... Through crack 2 ... Roughness of plating film surface 3 ... Polishing layer of plating film surface 4 ... Sealing part of crack 5 ... Hard chrome plating film 6 ... Iron-based material
Claims (2)
皮膜の耐蝕性向上方法であって、 該鉄系素材上に形成されたクラック密度が300本/cm以上
の該硬質クロムめっき皮膜に対して研磨によるめっき皮
膜の研磨量を△ｔ、めっき直後の皮膜表面の最大粗さ値
をRmaxとした場合、△t/Rmax f≧２となるように超仕上
げ研磨をおこなうことを特徴とする硬質クロムめっき皮
膜の耐蝕性向上方法。1. A method for improving the corrosion resistance of a hard chromium plating film formed on an iron-based material, wherein the hard chromium plating film formed on the iron-based material has a crack density of 300 / cm or more. On the other hand, when the polishing amount of the plating film by polishing is Δt and the maximum roughness value of the coating surface immediately after plating is Rmax, the super finish polishing is performed so that Δt / Rmax f ≧ 2. Method for improving corrosion resistance of hard chrome plating film.
皮膜の耐蝕性向上方法であって、 該鉄系素材上に形成されたクラック密度が580本/cm以上
の該硬質クロムめっき皮膜に対して研磨によるめっき皮
膜の研磨量を△ｔ、めっき直後の皮膜表面の最大粗さ値
をRmaxとした場合、△t/Rmax f≧１となるように超仕上
げ研磨をおこなうことを特徴とする硬質クロムめっき皮
膜の耐蝕性向上方法。2. A method for improving the corrosion resistance of a hard chromium plating film formed on an iron-based material, wherein the hard chromium plating film formed on the iron-based material has a crack density of 580 / cm or more. On the other hand, when the polishing amount of the plating film by polishing is Δt, and the maximum roughness value of the coating surface immediately after plating is Rmax, super-finishing is performed so that Δt / Rmax f ≧ 1. Method for improving corrosion resistance of hard chrome plating film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26998190A JP2712808B2 (en) | 1990-10-08 | 1990-10-08 | Method for improving corrosion resistance of hard chrome plating film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26998190A JP2712808B2 (en) | 1990-10-08 | 1990-10-08 | Method for improving corrosion resistance of hard chrome plating film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04146074A JPH04146074A (en) | 1992-05-20 |
| JP2712808B2 true JP2712808B2 (en) | 1998-02-16 |
Family
ID=17479913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26998190A Expired - Fee Related JP2712808B2 (en) | 1990-10-08 | 1990-10-08 | Method for improving corrosion resistance of hard chrome plating film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2712808B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4609391B2 (en) * | 1995-09-20 | 2011-01-12 | 株式会社日立プラントテクノロジー | Manufacturing method of water supply pump |
| JP2006095990A (en) * | 2004-09-30 | 2006-04-13 | Hitachi Metals Ltd | Screw excellent in abrasion resistance and corrosion resistance |
-
1990
- 1990-10-08 JP JP26998190A patent/JP2712808B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04146074A (en) | 1992-05-20 |
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