JP2005290443A - High corrosion resistant black skin steel - Google Patents
High corrosion resistant black skin steel Download PDFInfo
- Publication number
- JP2005290443A JP2005290443A JP2004105112A JP2004105112A JP2005290443A JP 2005290443 A JP2005290443 A JP 2005290443A JP 2004105112 A JP2004105112 A JP 2004105112A JP 2004105112 A JP2004105112 A JP 2004105112A JP 2005290443 A JP2005290443 A JP 2005290443A
- Authority
- JP
- Japan
- Prior art keywords
- steel material
- black skin
- corrosion resistance
- skin steel
- ion
- 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.)
- Withdrawn
Links
Landscapes
- Laminated Bodies (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
【課題】 表面スケールの除去や下地処理を不要とし、黒皮鋼材のままの使用であっても所望の耐食性を奏する高耐食黒皮鋼材を提供することを目的とする。
【解決手段】 表面が酸化物層で覆われた鋼材の亀裂部にリン酸塩皮膜を形成したことを特徴とする。また、前記リン酸塩皮膜の金属イオンがCaイオンもしくはMgイオンであることを特徴とする。したがって、耐食性が向上する。また、工程が簡素になり製造コストの低減を図ることができる。さらに、実施工に際しては、黒皮のままの屋外使用が可能になると共に、耐食性の向上により電着塗装やコンクリートとの密着性が低下することがない。
PROBLEM TO BE SOLVED: To provide a highly corrosion-resistant black skin steel material that eliminates the need for surface scale removal and ground treatment and exhibits desired corrosion resistance even when used as it is.
A phosphate film is formed on a crack portion of a steel material whose surface is covered with an oxide layer. Further, the metal ion of the phosphate film is Ca ion or Mg ion. Accordingly, the corrosion resistance is improved. Further, the process is simplified and the manufacturing cost can be reduced. Furthermore, when the construction work is performed, it is possible to use the skin as it is outdoors, and the adhesion with the electrodeposition coating or the concrete does not deteriorate due to the improvement of the corrosion resistance.
Description
本発明は、鉄鋼材料、特に、熱間圧延ままで表面が酸化物層（本発明において「表面スケール」と称す）によって覆われている鉄鋼材料（本発明において「黒皮鋼材」と称す）であって、耐食性を向上するための耐食性向上処理がなされた高耐食黒皮鋼材に関する。なお、本発明における黒皮鋼材とは、厚鋼板、薄鋼板、形鋼、鋼管、棒鋼、鋼線等を含むものである。 The present invention is a steel material, in particular, a steel material (referred to as “black skin steel” in the present invention) in which the surface is hot-rolled and the surface is covered with an oxide layer (referred to as “surface scale” in the present invention). The present invention relates to a highly corrosion-resistant black skin steel material that has been subjected to a corrosion resistance improving treatment for improving the corrosion resistance. In addition, the black skin steel material in this invention includes a thick steel plate, a thin steel plate, a shape steel, a steel pipe, a bar steel, a steel wire, and the like.
従来、建築・土木用途などに用いられる黒皮鋼材は1次保管時、倉庫など屋根のある場所で一部は保管されるものの、屋外で野積みされることが多い。特に、屋外で保管された鋼材は錆が発生し、著しく外観を損なう上、無塗装でコンクリート中に埋めて使用する場合には、コンクリート密着性が低下したりする。このような錆発生による外観劣化は屋内でも長期保管されることによってたびたび生じる。
一方、塗装して使用する場合には、塗装密着性ならびに塗装後耐食性を向上させる目的で塗装前処理としてショットブラスト等による黒皮除去処理を施す。保管時に錆が発生していても、このとき錆が落とされてしまうので、直接問題とはならない。塗装密着性を向上させる目的で「下地処理」としてりん酸処理が施される場合があった。該下地処理としては、亜鉛めっきを施すものや亜鉛等の微粒子をショットブラストするものがある。（例えば、特許文献１参照）。
On the other hand, when used after coating, a black skin removal process such as shot blasting is performed as a pre-coating process for the purpose of improving coating adhesion and post-coating corrosion resistance. Even if rust is generated during storage, the rust is removed at this time, so this is not a direct problem. In some cases, phosphoric acid treatment was performed as a “primary treatment” for the purpose of improving the paint adhesion. Examples of the base treatment include galvanization and shot blasting of fine particles such as zinc. (For example, refer to Patent Document 1).
しかしながら、前記耐食性向上方法は、黒皮鋼材の表面スケールを除去した地鉄表面に対して処理されるものであるため、該除去のための作業が発生するという問題があった。また、該除去が不完全な部位においては塗装後の耐食性が向上しないという問題があった。さらに、該除去の後で所定の下地処理のための作業が発生するという問題があった。 However, since the corrosion resistance improving method is applied to the surface of the ground iron from which the surface scale of the black skin steel material is removed, there is a problem that work for the removal occurs. In addition, there is a problem that the corrosion resistance after coating is not improved in the part where the removal is incomplete. Furthermore, there has been a problem that work for a predetermined ground treatment occurs after the removal.
本発明は上記問題を解決するためのものであり、表面スケールの除去や下地処理を不要とし、黒皮鋼材のままの使用であっても所望の耐食性を奏する高耐食黒皮鋼材を提供することを目的とする。 The present invention is intended to solve the above-described problems, and provides a highly corrosion-resistant black skin steel material that eliminates the need for surface scale removal and ground treatment, and exhibits desired corrosion resistance even when used as it is. With the goal.
（１）本発明は、表面が酸化物層で覆われた鋼材の亀裂部にりん酸塩皮膜を形成したことを特徴とする耐食性に優れた黒皮鋼材。 (1) The present invention is a black skin steel material excellent in corrosion resistance, characterized in that a phosphate film is formed in a crack portion of a steel material whose surface is covered with an oxide layer.
（２）また、前記りん酸塩皮膜の金属イオンがCaイオンもしくはMgイオンであることを特徴とする。 (2) Moreover, the metal ion of the said phosphate membrane | film | coat is Ca ion or Mg ion, It is characterized by the above-mentioned.
したがって、本発明の高耐食黒皮鋼材によれば、黒皮鋼材の表面スケールに生じている亀裂部にりん酸塩皮膜を形成されるから、耐食性が向上する。また、黒皮鋼材の表面スケールを除去する作業が発生しないから、工程が簡素になり製造コストの低減を図ることができる。さらに、実施工に際しては、黒皮のままの屋外使用が可能になると共に、耐食性の向上により電着塗装やコンクリートとの密着性が低下することがない。 Therefore, according to the highly corrosion-resistant black skin steel material of the present invention, the phosphate film is formed on the crack portion formed on the surface scale of the black skin steel material, so that the corrosion resistance is improved. Moreover, since the operation | work which removes the surface scale of a black skin steel material does not generate | occur | produce, a process is simplified and it can aim at reduction of manufacturing cost. Furthermore, when the construction work is performed, it is possible to use the skin as it is outdoors, and the adhesion with the electrodeposition coating or the concrete is not deteriorated due to the improvement of the corrosion resistance.
本発明の実施形態に係る高耐食黒皮鋼材は、黒皮鋼材をりん酸イオンを含む溶液に浸漬する工程と、該浸漬する工程の後、前記黒皮鋼材を乾燥する工程とによって製造される。なお、りん酸イオンとは、（ＰＯ4）3-、（ＨＰＯ4）2-、または（Ｈ2ＰＯ4）- をいう。
すなわち、熱間圧延された黒皮鋼材は、脱脂や予熱をすることなく、前記溶液に浸漬されるものである。なお、黒皮鋼材の表面スケールは種々の酸化物（酸化性や導電性を具備または不備のもの等）から構成され、それぞれ温度に対する線膨張係数が相違している。このため、熱間圧延後の冷却過程において、様々な亀裂が発生している。したがって、前記浸漬によって、前記亀裂には前記溶液が侵入することになる。
A highly corrosion-resistant black skin steel material according to an embodiment of the present invention is manufactured by a step of immersing the black skin steel material in a solution containing phosphate ions and a step of drying the black skin steel material after the soaking step. . The phosphate ion means (PO 4 ) 3− , (HPO 4 ) 2− , or (H 2 PO 4 ) − .
That is, the hot-rolled black skin steel material is immersed in the solution without degreasing or preheating. In addition, the surface scale of the black skin steel material is composed of various oxides (having or lacking oxidation property or conductivity), and the linear expansion coefficient with respect to temperature is different. For this reason, various cracks are generated in the cooling process after hot rolling. Therefore, the solution enters the crack by the immersion.
そして、前記亀裂に前記溶液が侵入している黒皮鋼材は、前記亀裂にりん酸塩皮膜が生成されることになる。すなわち、地鉄表面がりん酸塩皮膜によって覆われることにより耐食性が格段に向上する。
よって、前記亀裂の底部において地鉄表面が露出することなく、また、前記亀裂の底部への水侵入が効果的に防止されるから、前記黒皮鋼材の耐食性が格段に向上する。また、該耐食性の格段の向上によって、前記黒皮鋼材を黒皮ままで使用した場合であっても錆の発生が抑えられるから、コンクリートや電着塗装の密着性が低下することがない。また、前記工程が簡素であって、特別の装置を必要としないから、低コストで高い耐食性を奏する黒皮鋼材が得られる。
And the black skin steel material in which the said solution has penetrate | invaded the said crack will produce | generate a phosphate membrane | film | coat in the said crack. That is, the corrosion resistance is remarkably improved by covering the surface of the ground iron with the phosphate film.
Therefore, the surface of the iron core is not exposed at the bottom of the crack, and water intrusion into the bottom of the crack is effectively prevented, so that the corrosion resistance of the black skin steel material is significantly improved. Further, due to the marked improvement in corrosion resistance, the occurrence of rust can be suppressed even when the black skin steel material is used as it is, so that the adhesion of concrete and electrodeposition coating does not decrease. Moreover, since the said process is simple and does not require a special apparatus, the black skin steel material which shows low corrosion resistance and high corrosion resistance is obtained.
なお、前記浸漬は、前記亀裂に前記溶液を侵入させることを目的とするものであるから、該目的を満たす限り、前記溶液を噴射（スプレー）したり塗布（刷毛塗り）したりしてもよい。 In addition, since the said immersion aims at making the said solution penetrate | invade into the said crack, as long as this objective is satisfy | filled, you may spray (spray) and apply | coat (brush coating) the said solution. .
表１は本発明の実施形態に係る黒皮鋼材における耐食性向上効果を示すものであって、塩類の種類による耐食性向上効果である。本鋼材は熱間処理された後、脱脂や予熱することなく、各種金属塩類溶液濃度１０%で、溶液温度を５０℃に調整後、鋼材を５秒間浸漬し、浸漬後乾燥し耐食性を評価した。耐食性評価は、２８日間の屋内暴露および屋外暴露（広島県福山市にて、平成１５年１２月）後の表面状況を観察して判断した。
表１において、二重丸(◎)は錆の発生がほとんどなくて熱間圧延後の光沢のある黒皮が残っているもの、一重丸（○）は軽度の錆が発生しているもの、バツ（×）は錆が密集しているものを示す。
Table 1 shows the effect of improving the corrosion resistance of the black skin steel material according to the embodiment of the present invention, and shows the effect of improving the corrosion resistance depending on the type of salt. This steel material was hot-treated, and without degreasing or preheating, after adjusting the solution temperature to 50 ° C. with a concentration of various metal salt solutions of 10%, the steel material was immersed for 5 seconds, dried after immersion, and evaluated for corrosion resistance. . The corrosion resistance was evaluated by observing the surface condition after 28 days of indoor exposure and outdoor exposure (Fukuyama City, Hiroshima Prefecture, December 2003).
In Table 1, double circles (◎) have almost no rust and glossy black skin remains after hot rolling, and single circles (○) have mild rust. X (x) indicates that rust is dense.
表１において、比較例１は無処理のものである。比較例２〜５はりん酸イオンを含まない塩類で、実施例１〜５はりん酸塩の金属イオンの種類を変えたものである。
表１より、りん酸イオンを含む塩類を鋼材の亀裂部に皮膜を形成させた実施例１〜５は耐食性向上効果が認められ、特に、金属イオンがMgイオンからなる実施例１およびCaイオンからなる実施例３は耐食性向上効果が顕著である。
In Table 1, Comparative Example 1 is untreated. Comparative Examples 2 to 5 are salts that do not contain phosphate ions, and Examples 1 to 5 are examples in which the types of metal ions of phosphate are changed.
From Table 1, Examples 1-5 which formed the film | membrane in the crack part of steel materials with the salt containing a phosphate ion recognized the corrosion-resistant improvement effect, and especially from Example 1 and Ca ion in which a metal ion consists of Mg ion. In Example 3, the corrosion resistance improvement effect is remarkable.
以上のように本発明によれば、黒皮鋼材の表面スケールに生じている亀裂部にりん酸塩皮膜が形成されるから、板、管、棒等の各種形態の高耐食黒皮鋼材として広く利用することができる。
As described above, according to the present invention, since the phosphate film is formed on the crack portion generated on the surface scale of the black skin steel material, it is widely used as a highly corrosion resistant black skin steel material in various forms such as a plate, a pipe, and a rod. Can be used.
Claims (2)
2. The highly corrosion-resistant black skin steel material according to claim 1, wherein metal ions of the phosphate film are Ca ions or Mg ions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004105112A JP2005290443A (en) | 2004-03-31 | 2004-03-31 | High corrosion resistant black skin steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004105112A JP2005290443A (en) | 2004-03-31 | 2004-03-31 | High corrosion resistant black skin steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2005290443A true JP2005290443A (en) | 2005-10-20 |
Family
ID=35323711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2004105112A Withdrawn JP2005290443A (en) | 2004-03-31 | 2004-03-31 | High corrosion resistant black skin steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2005290443A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI417186B (en) * | 2007-04-18 | 2013-12-01 | Enthone | Metallic surface enhancement |
-
2004
- 2004-03-31 JP JP2004105112A patent/JP2005290443A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI417186B (en) * | 2007-04-18 | 2013-12-01 | Enthone | Metallic surface enhancement |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6653026B2 (en) | Solution composition for surface treatment of steel sheet, galvanized steel sheet surface-treated using the same, and method for producing the same | |
| JP5600992B2 (en) | Surface-treated corrosion-resistant steel with excellent weather resistance | |
| JP2010248567A (en) | Surface-treated steel with excellent corrosion resistance | |
| Conde et al. | Protective properties of a sol-gel coating on zinc coated steel | |
| JP6252400B2 (en) | Repair base coating composition | |
| JP5532009B2 (en) | Early rust aging weathering steel and method for producing the same | |
| JP4455712B2 (en) | Coated steel with atmospheric corrosion resistance | |
| JP6743524B2 (en) | Anti-corrosion coated steel and its manufacturing method, anti-corrosion method for coated steel | |
| JP2005290443A (en) | High corrosion resistant black skin steel | |
| JP6052521B2 (en) | Process for manufacturing corrosion-resistant metal member coating and process for manufacturing corrosion-resistant metal member | |
| JP6874363B2 (en) | Anti-corrosion coated steel materials and their manufacturing methods, anti-corrosion methods for coated steel materials | |
| JP2005290441A (en) | Method for improving the corrosion resistance of black skin steel | |
| KR101295679B1 (en) | Oxide film remover and method for removing oxide film using that | |
| KR100790269B1 (en) | Composition of anti-whitening agent for galvanized iron wire and steel wire and method of manufacturing galvanized iron wire and steel wire using the above inhibitor | |
| JP6701792B2 (en) | Painted corrosion resistant steel and anticorrosion method for corrosion resistant steel | |
| JP2827878B2 (en) | Surface treatment method for steel with excellent weather resistance | |
| JP2699733B2 (en) | Method for promoting rust stabilization of steel | |
| SA116380155B1 (en) | Anti-corrosion treatment composition for steel rebar embedded in concrete | |
| JP4343570B2 (en) | Steel base material and base material adjustment method | |
| JP5201806B2 (en) | Coated steel with excellent corrosion resistance and corrosion fatigue resistance | |
| JPH0737672B2 (en) | Rust weatherproof steel plate | |
| JPH10330881A (en) | Coated steel product excellent in durability | |
| JPS60166356A (en) | Anti-rust plated wire | |
| JP2001234351A (en) | Coated steel excellent in corrosion resistance | |
| CN222007664U (en) | Environment-friendly water-based anti-corrosion coating structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20070605 |