JPS58147562A - Pretreatment of titanium material - Google Patents

Abstract

PURPOSE:To obtain a plated product having a long life and producing no pit by blasting cast iron powder on the surface of a Ti material to provide a satin state by blasting before plating the Ti material. CONSTITUTION:Cast iron powder is blasted on the surface of a Ti material to provide a satin state by blasting. The treated surface is similar to a surface treated by blasting with Al2O3 powder, yet cast iron powder biting into the treated surface is easily removed unlike Al2O3 powder. The cast iron powder can be removed almost thoroughly by pretreatment with a liq. mixture of H2SO4 with H2O2 or by the pretreatment combined with ultrasonic treatment in alkali. When the pretreated Ti is used as an electrode substrate and plated with Pt, an effecient electrode having a long life, preventing the stripping-off of the Pt plating, and producing not a pit can be obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pretreatment method for plating titanium materials.

A titanium material made of titanium or an alloy, such as an electrode substrate VC
In order to perform Pt plating, conventionally, AlzOs powder such as alundum or emery is used for plasting treatment and roughened into a matte finish.

By the way, in this pretreatment method, the surface KA of the electrode base
Tsom powder gets stuck in and cannot be completely removed by normal means, and if Pl plating etc. is applied as it is, bits are likely to form, causing peeling, and affecting the function as an electrode (efficiency, lifespan). It extends to Al that bit into one side
K for removing zOs powder from the surface of the electrode base is 70°C.
Since it must be treated with NaOH solution, AI! 0
3. Removal of powder is extremely difficult.

The present invention was made to solve this problem, and uses a powder that can be easily and almost completely removed even if it bites into the surface of a titanium material made of titanium or its alloy.
It is an object of the present invention to provide a pretreatment method for carrying out a blast treatment on the surface of a titanium material made of titanium or its alloy.

The pretreatment method for a titanium material of the present invention is characterized by spraying cast iron powder onto the surface of a titanium material (such as titanium or its alloy) to perform a blast treatment and roughen it into a matte finish.

In this way, when the surface of titanium material is treated by spraying cast iron powder and roughened into a matte finish, the treated surface becomes similar to that of conventional aluminum.
The result is similar to that of plasto treatment using TOS powder, but
Treatment (Unlike A15OA, cast iron powder that has eaten into ILK can be easily removed.

That is, by using the acid treatment with a mixed solution of H8504 and H202 or the alkali (NaCN) ultrasonic treatment in combination, the cast iron powder that has bitten into the treated surface can be almost completely and easily removed.

If the titanium material pretreated in this way is used as an electrode substrate and its surface is plated with KPt, no bits will be generated, the Pt plating will not peel off, and a long-life and efficient electrode can be obtained. It will be done.

In addition, the cast iron powder used in the above-mentioned 9110 pretreatment method of the present invention preferably has a particle size of a05 to 0.7 mm, and is preferably IIO Punst pressure #i3 noodles/- to 10 noodles/- for plasto treatment. LJ) When the surface of the titanium material is subjected to plasting treatment under these conditions, it is roughened to a depth of 5 to 15 μm in a satin-like pattern, and Pt plating is applied satisfactorily.

Next, specific examples and conventional examples will be described in order to clarify the effects of the pretreatment method according to the invention.

[Example 1] 8−/− of cast iron powder with a grain size of 0.13 was deposited on the surface of an electrode base made of titanium, 100 m long, 100 m wide, and 3 cm high.
Plast treatment was carried out at a blasting pressure of 1.5 μm to a depth of 5 μm to 15 μm to create a satin-like texture. The pretreated electrode substrate was heated to 20°C.
After acid treatment with a mixture of Hs80a and HIOI for 90 minutes, the cast iron powder that bit into the treated surface of the electrode base was 98%
It was promptly removed.

[Example 2] 6 noodles/- of cast iron powder with a grain size of 07 am was applied to the surface of an electrode base made of titanium, measuring 50 m long, 50 sm wide, and 3 cm high.
Blast treatment is performed by spraying with a blast pressure of 5fi ~
A rough and satin-like surface with a depth of 15 μm. After this pretreatment, the nine electrode substrates were heated at 60°C with a mixture of Hz804 and H2O1.
After 120 minutes of acid treatment, 99.91% of the cast iron powder that had bitten into the treated surface of the electrode base was removed.

[Conventional example]

The surface of an electrode base made of titanium (100mm long, 100mm wide, and 3mm high) was blast-treated with 7 random Al5Oi1), and the surface was blasted in an east jlk shape at a depth of 5μ to 15μ.
1. Shita. The Mu 180s powder that had eaten into the treated surface of the pretreated electrode substrate could not be removed by ordinary acid treatment.

Therefore, when treated with NaOH solution at 70° C. for 180 minutes, less than 10% of the sample was removed.

As can be seen from the above explanation, in the pretreatment method for titanium materials according to the present invention, cast iron powder is sprayed onto the surface of the titanium material to perform a blast treatment to roughen it to a satin-like appearance. Powder can be easily and almost completely removed by acid treatment. Therefore, when this titanium material is plated with KPt, no bits are generated, the Pt plating does not peel off, and it is possible to obtain an efficient product with good adhesion and a long life.

Applicant: Tanaka Kikan Kaede Kogyo Co., Ltd.

Claims (1)

[Claims] A pretreatment method for titanium materials that is characterized by spraying cast iron powder onto the surface of the titanium material to give it a plasto treatment and roughen it to a matte finish before plating the titanium material.