JPS6196084A - Pretreatment of steel sheet before chemical conversion treatment - Google Patents
Pretreatment of steel sheet before chemical conversion treatmentInfo
- Publication number
- JPS6196084A JPS6196084A JP21606384A JP21606384A JPS6196084A JP S6196084 A JPS6196084 A JP S6196084A JP 21606384 A JP21606384 A JP 21606384A JP 21606384 A JP21606384 A JP 21606384A JP S6196084 A JPS6196084 A JP S6196084A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- phosphate
- chemical conversion
- conversion treatment
- steel plate
- 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
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
- C23C22/78—Pretreatment of the material to be coated
- C23C22/80—Pretreatment of the material to be coated with solutions containing titanium or zirconium compounds
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)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、鋼板にリン酸塩処理等の化成処理を施す前処
理としての化成処理前処理方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a chemical conversion pretreatment method as a pretreatment for subjecting a steel plate to a chemical conversion treatment such as phosphate treatment.
［従来の技術］
近年、自動車、家電製品等に用いられる冷延鋼板、電気
亜鉛ノー２キ鋼板等の塗装前処理方法として、亜鉛、鉄
等のリン酸塩を鋼板表面に形成する化成処理方法が広く
用いられている。この化成処装後の耐食性を向上し、そ
れら自動車、家電製品等の耐久性を向上可能としている
。この化成処理被膜による鋼板と塗料との密着性を効果
的に向上させるためには、リン酸塩の結晶が生成するた
めの核を鋼板表面に高密度で形成し、該鋼板表面に微細
なリン酸塩の結晶を均一に隙間なく形成する必要がある
。[Prior Art] In recent years, a chemical conversion treatment method in which phosphates of zinc, iron, etc. are formed on the surface of steel sheets has been used as a pre-painting treatment method for cold-rolled steel sheets, electric zinc-coated steel sheets, etc. used in automobiles, home appliances, etc. is widely used. The corrosion resistance after this chemical conversion treatment is improved, making it possible to improve the durability of automobiles, home appliances, etc. In order to effectively improve the adhesion between the steel plate and the paint due to this chemical conversion coating, it is necessary to form a high density of nuclei for the formation of phosphate crystals on the steel plate surface, and to add fine phosphorus to the surface of the steel plate. It is necessary to form acid salt crystals uniformly and without gaps.
［発明が解決しようとする問題点］
しかしながら、鋼板に上記化成処理に対する前処理を施
さない場合には、鋼板表面の汚れ、酸化被膜の存在によ
る表面性状の不均一、核発生の低密度化等により、リン
酸塩の結晶が粗大化してリン−酸塩被膜に、鋼板表面が
透視可能となるスケ、ムラを生じたり、リン酸塩被膜が
全く形成されない状態を生ずる。このような場合には、
塗装密着性、特に、耐水２次密着性の悪化が見られる。[Problems to be Solved by the Invention] However, if the steel sheet is not pretreated for the above-mentioned chemical conversion treatment, stains on the surface of the steel sheet, non-uniform surface texture due to the presence of an oxide film, low density of nucleation, etc. As a result, the phosphate crystals become coarse and the phosphate coating becomes uneven or uneven, making the surface of the steel sheet visible, or a phosphate coating is not formed at all. In such a case,
Deterioration of paint adhesion, especially water resistant secondary adhesion, was observed.
本発明は、鋼板表面に良好な化成処理被膜を形成可能と
し、塗装後の２凍害着性を向上することを目的とする。The object of the present invention is to enable the formation of a good chemical conversion coating on the surface of a steel plate and to improve the second frost damage adhesion after coating.
本発明に係る鋼板の化成処理前処理方法は、鋼板に化成
処理を施す前処理として、鋼板表面を研削用ブラシで研
磨した後、該鋼板表面にリン酸ナトリウムとリン酸チタ
ンからなる懸濁液を付着するようにしたものである。In the pretreatment method for chemical conversion treatment of a steel plate according to the present invention, as a pretreatment for chemical conversion treatment of a steel plate, the surface of the steel plate is polished with a grinding brush, and then a suspension of sodium phosphate and titanium phosphate is applied to the surface of the steel plate. It is designed so that it can be attached.
［作 用］
本発明によれば、研削ブラシによる鋼板表面の研磨によ
って、表面性状の均一な活性面を得た後、リン酸ナトリ
ウムとリン酸チタンによって該活性面に核を高密度に形
成し、結果として、鋼板表面に微細な化成処理被膜を均
一に隙間なく形成することが可能となる。[Function] According to the present invention, after obtaining an active surface with uniform surface properties by polishing the surface of a steel plate with a grinding brush, nuclei are formed at a high density on the active surface using sodium phosphate and titanium phosphate. As a result, it becomes possible to form a fine chemical conversion coating uniformly and without gaps on the surface of the steel sheet.
［実施例］
本発明の実施においては、まず、鋼板表面、たとえば電
気亜鉛メッキ鋼板のメッキ面を、スコッチブライ）５Ａ
Ｆ（商品名）、砥粒入ナイロン等からなる研削用ロール
ブラシで研磨する。この研磨においては、研磨残りを生
ずることがないように留意する必要があり、たとえば電
気亜鉛メッキ鋼板においては、そのノー２キ付着量を０
．５〜２ｇ／ｒｎ’減少する程度に研磨するのが良い。[Example] In carrying out the present invention, first, the surface of a steel plate, for example, the plated surface of an electrogalvanized steel plate, is coated with Scotch Bligh 5A.
Polish with a grinding roll brush made of F (product name), nylon containing abrasive grains, etc. In this polishing, care must be taken not to leave any polishing residue. For example, on electrogalvanized steel sheets, the amount of adhesion must be reduced to zero.
．． It is preferable to polish to the extent that it decreases by 5 to 2 g/rn'.
この研磨により、鋼板表面は汚れ、酸化被膜等の表面性
状を不均一化する要因を除去されると同時に、続くリン
酸ナトリウムとリン酸チタンからなる懸濁液の付着処理
段階に対する均一な活性面を提供可能とする。This polishing removes dirt, oxide films, and other factors that make the surface uneven, and at the same time provides a uniform active surface for the subsequent adhesion treatment step of a suspension consisting of sodium phosphate and titanium phosphate. can be provided.
次に、上記鋼板は、リン酸ナトリウムとリン酸チタンを
水に懸濁してなる懸濁液を、スプレーまたは浸漬処理に
よってその表面に付着される。懸濁液中における濃度は
ナトリウム４００〜２０００ｐｐｍ、チタン２０〜１１
００Ｐｐ、リン酸［１００〜３０００ｐｐｍの範囲が好
ましく、懸濁液の付着処理時間は１０〜２０秒とするの
が好適である。懸濁液を付着された鋼板は、絞りロール
で余分な懸濁液をその表面から除去され、ドライヤーで
乾燥される。Next, a suspension of sodium phosphate and titanium phosphate in water is applied to the surface of the steel plate by spraying or dipping. The concentration in the suspension is sodium 400-2000 ppm, titanium 20-11
00Pp, phosphoric acid [preferably in the range of 100 to 3000 ppm, and the adhesion treatment time of the suspension is preferably 10 to 20 seconds. The steel plate coated with the suspension is stripped of excess suspension from its surface with squeeze rolls and dried with a dryer.
このリン酸ナトリウムとリン酸チタンからなる懸濁液の
付着処理により、前記研削ブラシの研磨ムラによる鋼板
表面の活性度ムラが緩和され、鋼板表面には、後に行な
われるリン酸塩処理においてリン酸塩の結晶が生成する
ための核が高密度で形成される。By this adhesion treatment of the suspension consisting of sodium phosphate and titanium phosphate, the unevenness of activity on the steel plate surface due to the uneven polishing of the grinding brush is alleviated, and the phosphoric acid A high density of nuclei is formed for the formation of salt crystals.
したがって１本発明の実施によれば、鋼板表面に核を高
密度で形成することとなり、鋼板表面に微細なリン酸塩
被膜を均一に隙間なく形成することが可能となり、表１
に示すように、鋼板表面に良好なリン酸塩被膜を形成し
、塗料の耐水２次密着性を向上可能とする。Therefore, according to the implementation of the present invention, nuclei are formed at a high density on the surface of the steel sheet, and it is possible to form a fine phosphate coating uniformly and without gaps on the surface of the steel sheet, as shown in Table 1.
As shown in Figure 2, a good phosphate film is formed on the surface of the steel plate, making it possible to improve the water-resistant secondary adhesion of paint.
なお１表１は、電気亜鉛メッキ鋼板の表面にリン酸塩処
理を施し、さらにその主に電着塗装、中塗り、上塗りの
三層からなる３コート塗装を施した鋼板を試験片として
得た結果である。ここで、表１の処理法Ａは本発明の方
法であり、処理法Ｂであり、処理法Ｃはリン酸ナトリウ
ムとリン酸チタンからなる懸濁液の付着処理のみを施し
た方法である。In addition, Table 1 shows the test pieces obtained by applying a phosphate treatment to the surface of an electrogalvanized steel sheet, and then applying a 3-coat coating consisting mainly of electrodeposition coating, intermediate coating, and top coating. This is the result. Here, treatment method A in Table 1 is the method of the present invention, treatment method B is treatment method C, and treatment method C is a method in which only the adhesion treatment of a suspension consisting of sodium phosphate and titanium phosphate is performed.
［発明の効果］
以上のように、本発明に係る鋼板の化成処理前処理方法
は、鋼板に化成処理を施す前処理として、鋼板表面を研
削用ブラシで研磨した後、該鋼板表面にリン酸ナトリウ
ムとリン酸チタンからなる懸濁液を付着するようにした
ものである。したがって、鋼板表面に良好な化成処理被
膜を形成可能とし、塗装後の２凍害着性を向上すること
が可能となる。[Effects of the Invention] As described above, in the pretreatment method for chemical conversion treatment of a steel plate according to the present invention, as a pretreatment for applying chemical conversion treatment to a steel plate, the surface of the steel plate is polished with a grinding brush, and then phosphoric acid is applied to the surface of the steel plate. It is made to adhere to a suspension consisting of sodium and titanium phosphate. Therefore, it is possible to form a good chemical conversion coating on the surface of the steel plate, and it is possible to improve the second frost damage resistance after painting.
Claims (1)
研削用ブラシで研磨した後、該鋼板表面にリン酸ナトリ
ウムとリン酸チタンからなる懸濁液を付着することを特
徴とする鋼板の化成処理前処理方法。(1) As a pretreatment for chemical conversion treatment of a steel plate, the surface of the steel plate is polished with a grinding brush, and then a suspension consisting of sodium phosphate and titanium phosphate is applied to the surface of the steel plate. Chemical conversion treatment pretreatment method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21606384A JPS6196084A (en) | 1984-10-17 | 1984-10-17 | Pretreatment of steel sheet before chemical conversion treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21606384A JPS6196084A (en) | 1984-10-17 | 1984-10-17 | Pretreatment of steel sheet before chemical conversion treatment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6196084A true JPS6196084A (en) | 1986-05-14 |
Family
ID=16682693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21606384A Pending JPS6196084A (en) | 1984-10-17 | 1984-10-17 | Pretreatment of steel sheet before chemical conversion treatment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6196084A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61153284A (en) * | 1984-12-27 | 1986-07-11 | Nippon Steel Corp | Method and device for surface treatment of metallic material having hardly wettable surface |
| WO2007097139A1 (en) | 2006-02-20 | 2007-08-30 | Sumitomo Metal Industries, Ltd. | Process for producing hot-dip galvanized steel sheet with zinc phosphate coat |
-
1984
- 1984-10-17 JP JP21606384A patent/JPS6196084A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61153284A (en) * | 1984-12-27 | 1986-07-11 | Nippon Steel Corp | Method and device for surface treatment of metallic material having hardly wettable surface |
| WO2007097139A1 (en) | 2006-02-20 | 2007-08-30 | Sumitomo Metal Industries, Ltd. | Process for producing hot-dip galvanized steel sheet with zinc phosphate coat |
| EP1988189A1 (en) * | 2006-02-20 | 2008-11-05 | Sumitomo Metal Industries Limited | Process for producing hot-dip galvanized steel sheet with zinc phosphate coat |
| EP1988189A4 (en) * | 2006-02-20 | 2012-01-25 | Sumitomo Metal Ind | Process for producing hot-dip galvanized steel sheet with zinc phosphate coat |
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