JPH0575838B2 - - Google Patents
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- Publication number
- JPH0575838B2 JPH0575838B2 JP61106800A JP10680086A JPH0575838B2 JP H0575838 B2 JPH0575838 B2 JP H0575838B2 JP 61106800 A JP61106800 A JP 61106800A JP 10680086 A JP10680086 A JP 10680086A JP H0575838 B2 JPH0575838 B2 JP H0575838B2
- Authority
- JP
- Japan
- Prior art keywords
- plating
- chrome plating
- chrome
- chromium
- defects
- 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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- 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、クロムめつき被膜の形成方法に関
し、特に、フイルム形成機のロール、射出成形機
や押出機のロール、パワーシヨベルの油圧アーム
部、印刷機のロールなどの、耐食性を要求される
構造用鋼母材にクロムめつき被膜を形成する方法
に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for forming a chrome plating film, and in particular, the present invention relates to a method for forming a chrome plating film, and particularly to a roll of a film forming machine, a roll of an injection molding machine or an extrusion machine, a hydraulic arm part of a power shovel, This invention relates to a method for forming a chromium plating film on structural steel base materials that require corrosion resistance, such as printing press rolls.
工業用クロムめつき（以下、クロムめつきとい
う）は、高硬度であるため、耐摩耗性を要求され
る部品に多用される代表的表面処理である。しか
し、部品によつては、耐摩耗性と同時に耐食性も
併せて要求されることも多い。しかし、クロムめ
つきは、耐摩耗性を維持するためには、微小なク
ラツク・ビツトは避けられず、母材までの貫通ク
ラツクを少なくする手段としては、めつき厚を厚
くすることや重ねめつきを施工する方法がとられ
ている。両手段とも効果はあるものの、耐食性の
バラツキが大きい。クロムめつき品の腐食ダメー
ジは、クロム自体の腐食ではなく、クロムめつき
の欠陥部分を通じて腐食性物質が母材に到達し
て、母材金属を腐食させ、その際生成した錆等で
めつき層が持ち上り、部品の機能を低下させるこ
とが殆んどである。従つて、クロムめつき品の耐
食性向上は、クロムめつき層の欠陥をいかに少な
くし、被覆性を向上させるかにある。
Industrial chrome plating (hereinafter referred to as chrome plating) is a typical surface treatment that is often used for parts that require wear resistance because of its high hardness. However, depending on the part, corrosion resistance is often required as well as wear resistance. However, in order to maintain wear resistance with chrome plating, small cracks and bits are unavoidable, and the means to reduce the number of cracks that penetrate to the base metal are to thicken the plating thickness and to overlay the plating. The method of constructing a tsuki is used. Both methods are effective, but the corrosion resistance varies widely. Corrosion damage to chrome-plated products is not due to corrosion of the chrome itself, but rather corrosive substances reach the base metal through defects in the chrome plating, corrode the base metal, and the rust generated at that time damages the plating layer. In most cases, this builds up and deteriorates the functionality of the parts. Therefore, improving the corrosion resistance of chrome-plated products lies in reducing defects in the chrome-plated layer and improving coverage.
クロムめつきの耐食性向上手段として、従来重
ねめつきが行なわれているが、従来の重ねめつき
は、第２図に示すように、工程上では、母材１１
の研磨面１３上に垂直に第１層クロムめつき１２
の結晶が成長する。この層には、宿命として、母
材１１まで貫通する欠陥１４や末貫通欠陥１５な
どが存在する。これを工程で再表面を研削し、
研削面１６を得るが、クロムめつきには、内部応
力が存在するため、研削によつて未貫通欠陥１５
が母材１１に貫通するようになることが十分考え
られる。これに、工程で重ねめつき１７を行な
うと、第１表の欠陥を閉止する効果はあるもの
の、欠陥１４、欠陥１５のように閉止しきれない
状態が存続する。なお、図において、１８は実用
面（研摩面）を示す。 Conventionally, overlapping plating has been carried out as a means to improve the corrosion resistance of chrome plating, but as shown in Fig.
First layer chrome plating 12 perpendicularly on the polished surface 13 of
crystals grow. In this layer, defects 14 that penetrate to the base material 11, end-penetrating defects 15, etc. exist as a fate. This is then resurfaced in the process,
A ground surface 16 is obtained, but since internal stress exists in the chrome plating, non-penetrating defects 15 are obtained by grinding.
It is quite conceivable that this will penetrate into the base material 11. In addition, if overlapping 17 is performed in the process, although it has the effect of closing the defects shown in Table 1, conditions such as defects 14 and 15 that cannot be closed still remain. In addition, in the figure, 18 indicates a practical surface (polished surface).
クロムめつきの特長は、安価な材料、即ち構造
用鋼母材上に高硬度の被膜を付けることにより高
耐摩部材に変え得ることである。しかし、腐食環
境では、クロムめつきに不可避なクラツク・ピツ
トを通して、元来耐食性のない素材が腐食を起こ
し、その腐食生成物の膨張のため、めつき面が持
ち上がり（ふくれとなる）使用に耐えなくなる。
The advantage of chrome plating is that it can be made into a highly wear-resistant component by applying a high hardness coating to an inexpensive material, ie, a structural steel base material. However, in a corrosive environment, materials that are not inherently corrosion resistant corrode through the crack pits that are inevitable with chrome plating, and the corrosion products expand, causing the plated surface to lift (bulge) and become unusable. It disappears.
本発明は、従来の構造用鋼母材へのクロムめつ
き被膜の形成方法の欠点を解消し、めつき結晶の
成長方法を変化させることにより、クロムめつき
に不可避なクロツク・ピツトの貫通欠陥を除き、
構造用鋼に対して耐摩耗・耐食の両特性を保持さ
せることを可能とするクロムめつき被膜の形成方
法を提供しようとするものである。 The present invention solves the drawbacks of the conventional method of forming a chrome plating film on a structural steel base material, and by changing the growth method of plating crystals, it eliminates the through-hole defects of clock pits that are inevitable in chrome plating. except for
The present invention aims to provide a method for forming a chromium plating film that makes it possible to maintain both wear and corrosion resistance properties on structural steel.
本発明は、構造用鋼母材の表面に数層のクロム
めつき被膜を重ねて形成する方法において、上記
母材上に直接形成したクロムめつき被膜表面にブ
ラステイング処理を施して該表面に凹凸を形成し
た後、クロムを電気めつきすることを特徴とする
クロムめつき被膜の形成方法である。
The present invention is a method for forming several layers of chromium plating on the surface of a structural steel base material by applying a blasting treatment to the surface of the chromium plating coat formed directly on the base material. This method of forming a chrome plating film is characterized by electroplating chromium after forming the unevenness.
本発明は、クロムめつき被膜より硬度の低い構
造用鋼の表面に一旦クロムめつき被膜を形成した
後、該クロムめつき被膜表面に対してブラステイ
ング処理を施して該表面に凹凸を形成し、次い
で、クロムを電気めつきすることを特徴とする。
The present invention involves forming a chrome plating film on the surface of structural steel whose hardness is lower than that of the chrome plating film, and then subjecting the surface of the chrome plating film to a blasting treatment to form irregularities on the surface. , and then electroplated with chrome.
即ち、ブラステイング処理を施したクロムめつ
き被膜の凹凸面に対して電気めつきを行うと、電
気めつきの特性から、上記凹凸の凸部の電流密度
が高くなり、この凸部からクロムの結晶を優先的
に成長し、放射状（断面では扇状に見える）結晶
を形成する。この放射状の結晶は、成長が順次進
行すると、隣合う結晶が相互に干渉することによ
り、クロムめつきにおいて不可避なピツト・クラ
ツクの貫通欠陥を塞ぎ、実質的に皆無にすること
ができる。 In other words, when electroplating is performed on the uneven surface of a chromium plating film that has been subjected to a blasting process, the current density at the convex portions of the convex and convex portions increases due to the characteristics of electroplating, and chromium crystals flow from these convex portions. preferentially grows, forming radial crystals (which appear fan-shaped in cross section). When these radial crystals grow sequentially, adjacent crystals interfere with each other, thereby closing the pit-cracks through-hole defects that are inevitable in chromium plating, making it possible to substantially eliminate them.
しかし、構造用鋼の表面にブラステイング処理
を施すと、構造用鋼の硬度が比較的低いために、
その表面に研磨材が埋め込まれ、研磨材を完全に
除去することができない。このような研磨材を含
む表面にクロムの電気めつきを施すと、研磨材が
新たな結晶欠陥を発生し、ピツト・クラツクの貫
通欠陥を生む原因となる。 However, when blasting is applied to the surface of structural steel, due to the relatively low hardness of structural steel,
The abrasive material is embedded in the surface and cannot be completely removed. When electroplating with chromium is applied to a surface containing such an abrasive material, the abrasive material generates new crystal defects, causing through-hole defects such as pit cracks.
そこで、本発明では、構造用鋼の表面に一旦ク
ロムメツキ被膜を形成し、高硬度のクロムめつき
被膜表面に対してブラステイング処理を施すこと
より、研磨材の埋め込みを防止することができ、
研磨材による新たな結晶欠陥の発生を回避するこ
とができるのである。 Therefore, in the present invention, by first forming a chrome plating film on the surface of structural steel and then performing a blasting treatment on the surface of the highly hard chrome plating film, it is possible to prevent the abrasive from embedding.
This makes it possible to avoid the generation of new crystal defects due to the abrasive.
次に、本発明を図面に基づいて説明する。 Next, the present invention will be explained based on the drawings.
第１図に示すように、工程では、構造用鋼母
材１の表面３に直接クロムめつき層２を形成し、
工程では、上記のクロムめつき層２の表面にブ
ラステイング処理を施して凹凸面４を形成する。
工程では、高硬度のクロムめつき被膜表面に対
してブラステイング処理を施すので、研磨材が該
表面に埋め込まれることはない。次いで、工程
では、研磨材を含まない上記の凹凸面にクロムの
電気めつき処理を施すので、研磨材による新たな
結晶欠陥を発生させず、凹凸面の凸部からクロム
結晶を優先的に成長させ、扇状結晶を形成するこ
とができるので、隣合う結晶の干渉によりピツ
ト・クラツクの貫通欠陥の極めて少ないクロムめ
つき層を得ることができる。そして、工程に続
いて表面を研磨することにより実用面６を得る。 As shown in FIG. 1, in the process, a chromium plating layer 2 is directly formed on the surface 3 of the structural steel base material 1,
In the step, the surface of the chromium-plated layer 2 is subjected to a blasting treatment to form an uneven surface 4.
In the process, since the surface of the highly hard chromium plating film is subjected to a blasting treatment, the abrasive will not become embedded in the surface. Next, in the process, chromium is electroplated on the uneven surface that does not contain an abrasive, so chromium crystals are preferentially grown from the convex parts of the uneven surface without creating new crystal defects due to the abrasive. Since it is possible to form fan-shaped crystals, it is possible to obtain a chromium-plated layer with extremely few through-hole defects such as pit cracks due to interference between adjacent crystals. Then, following the process, the practical surface 6 is obtained by polishing the surface.
なお、工程で得たクロムめつき層に対して、
工程のブラステイング処理、及び、工程のク
ロムの電気メツキ処理を繰り返すことにより、ピ
ツト・クラツクの貫通欠陥をより少なくすること
も可能である。 In addition, for the chrome plating layer obtained in the process,
By repeating the blasting process and the chromium electroplating process, it is possible to further reduce the number of through-hole defects such as pits and cracks.
（実施例）
直径150mm、長さ500mm、厚さ５mmの
STKM11Aめつき基材を用い、その表面を0.1mm
研削し、脱脂、酸洗した後、CrO3を230ｇ／リツ
トル、Cr（）を１〜５ｇ／リツトル、H2SO4を
2.3〜2.8ｇ／リツトルからなる、液温53±２℃の
めつき液に浸漬し、20A／ｄm2の電流密度でクロ
ムめつきを施し、厚さ50μｍの第１層クロムめつ
き層を形成した。
(Example) Diameter 150mm, length 500mm, thickness 5mm
Using STKM11A plating base material, the surface is 0.1mm
After grinding, degreasing and pickling, 230g/liter of CrO3 , 1-5g/liter of Cr(), H2SO4
Immerse in a plating solution containing 2.3 to 2.8 g/liter at a temperature of 53 ± 2°C and apply chrome plating at a current density of 20 A/dm 2 to form the first chrome plating layer with a thickness of 50 μm. did.
次いで、60メツシユのアルミナ製ブラスト粒子
を用い、ブラスト圧19.6×104Paで乾式法でブラ
スト処理を施した後、第１層クロムめつき条件の
うち、電流密度を22.5A／ｄm2に変更した以外は
同じ条件で厚さ50μｍの第２層クロムめつき層を
形成した。 Next, dry blasting was performed using 60 mesh alumina blast particles at a blast pressure of 19.6 x 10 4 Pa, and the current density was changed to 22.5 A/dm 2 among the first layer chrome plating conditions. A second chromium plating layer with a thickness of 50 μm was formed under the same conditions except for the following steps.
その後、表面研削を施してめつき厚さの合計を
85μｍとし、バフ仕上げを施して実施例のロール
状試験品を完成した。 After that, surface grinding is performed to calculate the total plating thickness.
The roll-shaped test product of the example was completed by applying a buff finish to 85 μm.
（比較例）
上記実施例において、第１層クロムめつき層の
厚さを55μｍとし、ブラスト処理の代わりに研削
処理を施してめつき厚さを45μｍとし、第２層ク
ロムめつき層の厚さを55μｍしし、表面研削を施
してめつき厚さの合計を90μｍとした以外は、実
施例と同じ条件で比較例のロール状試験品を完成
した。(Comparative example) In the above example, the thickness of the first chrome plating layer was 55 μm, the plating thickness was 45 μm by performing grinding instead of blasting, and the thickness of the second chrome plating layer was 55 μm. A roll-shaped test article of a comparative example was completed under the same conditions as the example except that the thickness was 55 μm and the surface was ground to make the total plating thickness 90 μm.
（耐食性評価試験）
実施例及び比較例のロール状試験品のロール部
のみをチヤンバに収納し、超音波加湿器及びオゾ
ン発生器で水蒸気及びオゾンを発生してチヤンバ
内のオゾン濃度を100ppmに調整し、湿潤酸化環
境を形成し、上記ロール部を60rpmで回転しなが
ら500時間暴露した。(Corrosion resistance evaluation test) Only the roll parts of the roll-shaped test products of Examples and Comparative Examples were stored in a chamber, and the ozone concentration in the chamber was adjusted to 100 ppm by generating water vapor and ozone with an ultrasonic humidifier and an ozone generator. A moist oxidizing environment was created, and the roll was exposed for 500 hours while rotating at 60 rpm.
暴露終了後のロール中央部300mmを円周方向に
６等分し、その長手方向６断面を研摩して顕微鏡
により、めつき直下の母材の腐食浸食深さを測定
して評価した。 After the exposure, the central 300 mm of the roll was divided into six equal parts in the circumferential direction, six cross sections in the longitudinal direction were polished, and the corrosion depth of the base material directly under the plating was measured and evaluated using a microscope.
その結果、実施例の腐食浸食深さは0.0015〜
0.0020mmであるのに対し、比較例の腐食浸食深さ
は0.0060〜0.0075mmであり、実施例は比較例と比
べて（0.0060／0.0020）〜（0.0075／0.0015）＝３
〜５倍の耐食性が向上していることが確認され
た。 As a result, the corrosion depth of the example was 0.0015 ~
0.0020 mm, whereas the corrosion depth of the comparative example is 0.0060 to 0.0075 mm, and the example is (0.0060/0.0020) to (0.0075/0.0015) = 3 compared to the comparative example.
It was confirmed that the corrosion resistance was improved by ~5 times.
本発明は上記構成を採用することにより、クロ
ムめつきに不可避なピツト・クラツクの貫通欠陥
を皆無に近くすることができ、安価な構造用鋼材
料に耐摩耗、耐食の両特性を保持させることがで
きた。
By adopting the above configuration, the present invention can nearly eliminate the pit and crack penetration defects that are unavoidable in chrome plating, and allow inexpensive structural steel materials to maintain both wear and corrosion resistance properties. was completed.
第１図〜は、本発明によるクロムめつきの
施工工程を示した図、第２図〜は、従来の重
ねめつき施工工程を示した図である。
Figures 1 and 2 are diagrams showing the chrome plating construction process according to the present invention, and Figures 2 and 2 are diagrams showing the conventional overlapping plating construction process.
Claims (1)
膜を重ねて形成する方法において、上記母材上に
直接形成したクロムめつき被膜表面にブラステイ
ング処理を施して該表面に凹凸を形成した後、ク
ロムを電気めつきすることを特徴とするクロムめ
つき被膜の形成方法。1 In a method of forming several layers of chrome plating on the surface of a structural steel base material, the surface of the chrome plating film formed directly on the base material is subjected to a blasting treatment to form irregularities on the surface. A method for forming a chrome plating film, which is characterized by electroplating chrome after that.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10680086A JPS62263994A (en) | 1986-05-12 | 1986-05-12 | Formation of plated chromium film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10680086A JPS62263994A (en) | 1986-05-12 | 1986-05-12 | Formation of plated chromium film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62263994A JPS62263994A (en) | 1987-11-16 |
| JPH0575838B2 true JPH0575838B2 (en) | 1993-10-21 |
Family
ID=14442949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10680086A Granted JPS62263994A (en) | 1986-05-12 | 1986-05-12 | Formation of plated chromium film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62263994A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0234799A (en) * | 1988-07-26 | 1990-02-05 | Kanzaki Paper Mfg Co Ltd | Mat roll and production of mat coated paper with said roll |
| JPH0397894A (en) * | 1989-09-11 | 1991-04-23 | Kimura Kuroomu Kogyosho:Kk | Method for satin black chrome plating treatment |
| JPH07122157B2 (en) * | 1990-09-11 | 1995-12-25 | 株式会社サトーセン | Roll surface treatment method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54112733A (en) * | 1978-02-24 | 1979-09-03 | Toyoda Automatic Loom Works | Plating treatment of aluminium metal product |
| JPS5814504A (en) * | 1981-07-17 | 1983-01-27 | サンケン電気株式会社 | Oxide voltage nonlinear resistor |
-
1986
- 1986-05-12 JP JP10680086A patent/JPS62263994A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62263994A (en) | 1987-11-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |