JPH06346281A - Surface treatment of work - Google Patents

Abstract

PURPOSE:To efficiently surface-treat a work in a short time without causing environmental pollution by using a wet blasting device for the plating pretreatment. CONSTITUTION:An appropriate liq. such as a mixture of water with a fine abrasive grain is injected on a work under pressure. As a result, an oxide film on the work surface is removed, the surface is degreased and activated, and the affected layer on the work surface is removed. When the work is plated, an excellent plating layer is formed on the surface without need for any conventional plating pretreatment because the work surface is cleaned in the cleaning stage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work surface treatment method capable of efficiently performing work surface treatment.

[0002]

2. Description of the Related Art The so-called plating treatment that has been conventionally proposed is roughly divided into the following:
As shown in the flow chart of FIG. 1, it is composed of two steps, a plating pretreatment step and a plating treatment step. The pre-plating treatment step is a step of appropriately treating the surface of the work in the subsequent plating treatment step so that the plating layer is satisfactorily adhered to the work. Specifically, the oxide film on the work surface is removed by using an appropriate mechanical means, acid or alkali, or the work surface is degreased by using acid or alkali. This is a step of activating the surface (washing with an acid or alkali), or removing (etching) an altered layer on the surface of the work with an acid or the like.

By the way, the applicant is a device for cleaning the surface of the work by injecting a mixture of water and abrasive grains onto the work under pressure (hereinafter referred to as a wet blasting device).
Have been studying for many years.

[0004] The applicant has a problem in that the plating pretreatment step in the above-mentioned conventional plating treatment has to be variously selected depending on the material of the work, what kind of plating layer is applied, etc., as described above. Yes, it takes labor.

The waste liquid generated by this pretreatment of plating causes pollution problems.

Focusing on the problem of the above problem, the present invention has been accomplished by combining the above-mentioned wet blasting apparatus with plating treatment to solve the above-mentioned problems and, in addition, various other merits.

The present invention provides an excellent work surface treatment method capable of very efficiently performing work surface treatment.

[0008]

The gist of the present invention will be described with reference to the accompanying drawings.

A work cleaning step of spraying a mixture of a suitable liquid and fine abrasive grains onto the work under pressure, and a plating processing step of applying a plating layer to the surface of the work cleaned by this work cleaning step. The present invention relates to a work surface treatment method.

[0010]

[Function] The oxide film on the work surface is removed and the work surface is degreased and the work surface is activated by the work cleaning process in which a mixture of an appropriate liquid and fine abrasive grains is sprayed under pressure to the work. The altered layer of is removed. Then, a plating process is performed. Since the work surface is cleaned by the plating cleaning process, the plating layer can be satisfactorily formed on the work surface without the conventional plating pretreatment process.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 is a flow chart of an embodiment of the present invention, which will be described below.

The apparatus used in the work cleaning step of the present embodiment is a wet blasting apparatus that sprays abrasive grains such as alumina and glass beads onto the work together with pressurized water.
The diameter of the abrasive grains is appropriately selected according to various conditions such as the material of the work, the type of plating adhered to the surface of the work, and the degree of plating adhesion.

The apparatus used in the plating process subsequent to this apparatus is a known plating apparatus.

The present embodiment has the following features because the surface of the work is treated by the above-mentioned apparatus. The plating pretreatment process that has been performed up to now is unnecessary.

That is, the oxide film on the surface of the work and the intermetallic compound (a hard foreign substance generated on the work surface depending on the type of the work) are removed by the injection of pressurized water mixed with abrasive grains, and
Since the work surface is degreased and the surface of the work is peeled off, the surface is activated and the altered layer is removed as in the case of etching treatment. Therefore, it is possible to form a good plating layer by simply washing with water and introducing it into the plating apparatus after the pressurized water containing abrasive grains is jetted by the present wet blasting apparatus.

Since the pretreatment for plating used various chemicals so far, the pollution problem due to the waste liquid occurred, but in this embodiment, no pollution problem occurs because no chemicals are used.

Since the pretreatment for plating so far is performed by chemicals, various chemicals must be selected depending on the material of the work (whether the work is iron or copper). However, since the present embodiment is pretreatment with pressurized water mixed with abrasive grains, it is not necessary to select chemicals.

The conventional plating pretreatment with chemicals requires a certain amount of time because it is necessary to immerse the work in the chemicals for a predetermined time, but this embodiment is merely a pretreatment by spraying pressurized water mixed with abrasive grains. , It takes a very short time.

[0019]

According to the present invention as described above, the surface treatment of the work can be performed extremely efficiently.

[Brief description of drawings]

FIG. 1 is a process flow chart of a conventional example.

FIG. 2 is a process flow chart of the present embodiment.

Claims (1)

[Claims] 1. A work cleaning step of spraying a mixture of a suitable liquid and fine abrasive grains onto a work under pressure, and a plating processing step of applying a plating layer to the surface of the work cleaned by this work cleaning step. Work surface treatment method consisting of.