METHOD OF REMOVING OXIDE FILM OF METAL SURFACE

• Main Authors: NAGAI TATSUO, YOSHIMURA NAMI
• Format: Patent
• Language: English; Japanese
• Published: 20.09.2018
• Subjects: APPARATUS THEREFOR; CHEMISTRY; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; METALLURGY; PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROMOBJECTS

PROBLEM TO BE SOLVED: To provide a method of removing an oxide film of a metal material surface, which can easily remove not only a natural oxide film formed on the surface of a titanium or titanium alloy but also a thick oxide film formed by anode oxidation etc., and which can form a renewable surface.SOLUTION: In a method of removing an oxide film of a metal material surface, a processing apparatus 1 comprises: a processing tank 2; and a cathode member 4 and an anode member 5 that are placed in the processing tank 2. The cathode member 4 and the anode member 5 are connected to a minus electrode and a plus electrode of a DC power supply 3, respectively. In the processing apparatus 1, the cathode member 4 composed of a titanium or titanium alloy member, on the surface of which a thick anode oxide film is formed, is used. As for the anode member 5, a diamond-based electrode, a platinum-group-based electrode, or the like is used. As for an electrolytic treatment solution accommodated in the processing tank 2, an electrolyte S of sulfuric acid concentration 5-75% in weight is used. The temperature of the electrolyte S is 10°C or more, preferably 20-90°C.SELECTED DRAWING: Figure 1 【課題】チタン又はチタン合金表面に形成される自然酸化皮膜のみならず陽極酸化などにより形成された厚い酸化皮膜除去を容易にし、再生可能な表面を形成することが可能な金属材表面の酸化皮膜の除去方法の提供。【解決手段】処理装置１は、処理槽２とこの処理槽２内に設置された陰極部材４及び陽極部材５とを有し、これら陰極部材４及び陽極部材５はそれぞれ直流電源３のマイナス極及びプラス極に接続している。この処理装置１において、陰極部材４は、チタン又はチタン合金製の部材であってその表面に厚い陽極酸化皮膜が形成されたものを用いる。また、陽極部材５としては、ダイヤモンド基材とした電極や白金族金属を基材とした電極等を用いる。処理槽２に収容する電解処理の溶液としては、硫酸濃度５〜７５重量％の電解液Ｓを用いる。この電解液Ｓの温度は１０℃以上、好ましくは２０〜９０℃である、酸化皮膜の除去方法。【選択図】図１