JPS5848670A - Treatment of surface - Google Patents

Abstract

PURPOSE:To obtain a tape guide member capable of maintaining rhe initial characteristics during long-term use by using cupric ion and a mineral acid as the principal components of an etching soln. for treating the surface of a tape guide member. CONSTITUTION:The surface of a tape guide member is treated with an etching agent contg. cupric ion and a mineral acid as the principal components. Thus, a tape guide member with high roundness and stable surface roughness is obtd. This member undergoes remarkably less intergranular corrosion than a member treated with an etching agent contg. ferric chloride as the principal component, and it shows favorable results in a brine spray test. Even if a tape is continuously run over a long time, the intial characteristics of this member can be maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a surface treatment method, and in particular, item (c) relates to a surface treatment method for a tape guide member.

Conventionally, tape guide members such as capstans used in audio and video equipment have been processed by mechanical methods such as sandblasting, liquid horny blowing, and ceramic coating, or by chemical methods such as etching. Mechanical methods are easy to operate, but problems arise in keeping the surface roughness at a certain level and the roundness below 0.5μ, which is considered to cause no distortion in the sound. .

As for the etching method, which is a chemical method, it is known that a ferric chloride solution is used as an etching bath solution. If the etching process is performed until the grain boundary corrosion of the material becomes dull, the salt spray test (JIS-22301
) When assembled into a V coder with 〇/m9 tape that rusted easily, it was possible to drive the tape stably in the initial stage of use, but as the usage time became longer, the overlap with the tape caused the problem. The surface roughness force f changed and the initial characteristics could no longer be maintained.

Therefore, the present invention provides a new surface treatment method that can improve the various drawbacks of the prior art.

The method according to the invention comprises surface-treating the tape guide member to a suitable surface roughness in an etching solution containing cupric ions and mineral acids as main components.

Examples of the compound used as cupric io/# include halogenated steels such as cupric chloride and cupric bromide, sulfuric acid steel, and cupric nitrate. The amount of such a compound used is not particularly limited, but is about 0.5 to 20
011/l. If too little of such a compound is used, the etching time will be too long; if too much of the compound is used, the etching time will be too short and there is a risk that a uniform surface roughness will not be obtained and the mineral will be damaged. When the acid concentration and temperature are lowered, precipitation may occur, which is not preferred in practice. These compounds are
When made into an aqueous solution, it generates cupric ions and is suitable as an etching solution used in the present invention.

Further, examples of the mineral acids used include hydrochloric acid, sulfuric acid, and nitric acid. This mine #I! It is best to use a range of about 0.1 to 6 feet.

The etching agent that can be used in this invention in which cupric ions are present as described above may optionally contain a surfactant to lower the surface tension of the processing solution and suppress grain boundary corrosion. Alcohols such as ethanol, viscosity S
Additives such as carboxymethyl cellulose and carboxymethyl cellulose can be added as conditioners.

When using alcohols, the amount is preferably up to about 40 by volume, and the amount of surfactant and viscosity a14 adjuster is about 0.
．． It is advantageous to use a range of 0.01 to 11 I/l.

Among the etching treatment conditions in the method according to the present invention, the etching temperature is not particularly limited;
Preferably, it is within the range of about 10U to 70U. From the viewpoint of practicality such as work, a range of 20C to 50C is more preferable. Furthermore, the etching treatment time is not particularly limited, and can be determined as appropriate depending on the degree of surface roughness caused by etching, but generally the etching process takes about 10 seconds to 20 minutes. Yes0 The tape guide member buried as described above according to the method of the present invention has good roundness and stable surface roughness. In addition, compared to the case of treatment with an etching agent containing ferric chloride as a main component, the number of grain boundary cavities is significantly less, and good results can be obtained in the salt spray test. Furthermore,
When the tape guide member processed according to the present invention is assembled into a tape recorder and the tape is moved laterally,
Its initial characteristics can be maintained even after continuous operation.

Hereinafter, this invention will be explained in detail with reference to Examples. Example C [A stainless steel day pillar-shaped tape guide member containing 10% or more was treated with CuCl250 l/l and 1NHCe after removing oil and fat with Trichlorine.
When etching treatment was performed by immersing the tape guide member in a 10-thiethanol aqueous solution containing the following at 60C for 5 minutes, a tape guide member having a surface roughness of about 1 to 6 μm was obtained.

The surface of this surface-treated tape guide member was scanned.
When observed under a microscope, it was found that grain boundary erosion was significantly less than in the case of ferric chloride.

-17 (Good results were obtained in the salt water spray test according to JIs-Z2301.Furthermore, in a continuous tape running test with this member installed in a tape recorder,
Even after more than 1500 hours had passed, the initial properties remained unchanged.

Comparative Example In the same manner as in Example, the surface was treated with an aqueous solution of ferric chloride at 40° Baume. The parts obtained in this way were 50
After some time, the initial characteristics and special number wow and flutter almost doubled.

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Claims (1)

[Claims] A surface treatment method that involves surface treating a tape guide member with an etching agent whose main components are cupric ions and mineral acids.