JPS6280297A - Production of electrode - Google Patents

Abstract

PURPOSE:To produce an electrode having a constant area for electrolysis and satisfactory electrical properties by roughening the surface of a Ti core material and subjecting it to plating with a noble metal, plating with solder and coating with Pb of Sn by a melting method. CONSTITUTION:A Ti core material or a core material clad with Ti is pretreated by a proper method and the surface of the core material is roughened. The roughened surface is plated with a noble metal such as Pt by electroplating or other method to >=0.1mum thickness. The plated surface is further plated with solder by electroplating or other method to >=1mum thickness and coated with Pb, Sn or Pb-Sn by a melting method to about several - several ten mm thickness to produce an electrode. The metallic layers of the electrode have satisfactory adhesion and the electrode is suitable for use as an insoluble anode in a galvanizing bath or the like. Work is easily carried out during the production and maintenance of the electrode.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention mainly relates to a method of manufacturing an electrode used for an insoluble anode such as an electrolytic Zn plating bath or an electrolytic Sn plating bath.

(Prior Art) Conventionally, solid pb electrodes, PbOz electrodes, Pt-coated Ti electrodes, Cu/Ti electrodes, etc. have been used as insoluble anodes in electrolytic Zn plating baths, electric Sn baths, and the like.

(Problems to be Solved by the Invention) By the way, the above-mentioned solid Pb electrode is thick and heavy, which makes it difficult to work with, and when it wears out, the electrolytic area becomes smaller and the electrical quality deteriorates. There's a problem.

Furthermore, the above-mentioned pbo□ electrode has a problem in that it requires expensive plating equipment for manufacturing.

Furthermore, for Ti electrodes or Cu/Ti electrodes with PT co-coating, it is necessary to add PT each time the PT co-coing is worn out, or to peel off all remaining PT co-coing and recoat with PT. Therefore, there is a problem that maintenance becomes extremely expensive.

Therefore, the present invention aims to provide a manufacturing method that does not reduce the electrolytic area, improves electrical quality, facilitates manufacturing and maintenance work, and can obtain an inexpensive electrode. .

(Means for Solving the Problems) In order to solve the above problems, the method for manufacturing an electrode of the present invention is to pre-treat a Ti core material or a core material clad with Ti on the outside, and then Noble metal plating is applied, then 1
It is characterized by applying solder plating of μ or more, and then coating with Pb, Sn, or Pb-5n by a melting method.

(Example) An example of the method for manufacturing an electrode according to the present invention will be described as follows.
First, a material in which Ti is clad on the outside of a Cu core material is pretreated using a physical treatment method such as sandblasting to roughen the surface and a chemical treatment method to roughen the surface with chemicals.
0.5μ of PT was plated by electroplating method, then 50μ of solder was plated by electroplating method, and then Pb was plated by 1μ by melting method.
Electrodes were obtained by coating 5 dragons.

Next, to explain another example, a material containing only Ti as a core material was pretreated using only a chemical treatment method to roughen the surface with chemicals, and then plated with 10 μm of PT using an electroplating method. ,
Next, 600 μm of solder was plated using the melt plating method, and then P
An electrode was obtained by coating 5% b-3μ by a melting method.

Observing the cut surface of the electrode obtained in the above example, it was found that the adhesion of each plating layer and coating layer was good and when the tensile strength was examined using an adhesive, it was 200 kg/cn1 or more, which was so strong that the adhesive peeled off. It is.

When these electrodes were used as insoluble anodes in electrolytic Zn plating baths or electrolytic Sn plating baths, Pb and pb-3μ on the surface
Even if 5% is consumed, there is solder and PT underneath, so corrosion of the core material is prevented.Also, even if PB or Pb-3μ5% is partially lost, there is a solder layer, so the P layer will not be corroded. Never. Therefore, the electrolytic area is always constant and the electrical quality is extremely good. In addition, cheap Pb and PB-3μ5% can be added when they are used up, and the underlying PT only needs to be plated once during manufacture, which is extremely advantageous in terms of maintenance. That is, during maintenance, the burner and Pb or S
As long as there is a rod material of n or Pb-Sn, coating can be performed easily and quickly without the need for pretreatment or flux, there is no contamination of impurities, the adhesion strength is high, and the quality is also good.

In addition, in the electrode manufacturing method of the present invention, the thickness of the noble metal plated on the material is 0.1μ or more, and although there is no upper limit limit, in reality, about 20μ is good, and plating more than that will only become expensive. It is. Also, the thickness of the solder plating is 1μ
The above does not limit the upper limit, but in reality, a maximum of one fin is sufficient. Further pb or Sn or Pb-
Although the coating thickness of Sn is not specified, a thickness of several 11 to several tens is sufficient in practice.

In the above embodiments, the noble metal plated on the material is PT, but it may also be Au, Ag, PCT, Rh, or Ir.

(Effects of the Invention) As can be seen from the above explanation, according to the electrode manufacturing method of the present invention, the electrolytic area is always constant, the electrical quality is extremely good, and the manufacturing and maintenance work is easy. Moreover, there is an excellent effect that an electrode suitable for an inexpensive insoluble anode can be obtained.

Claims (1)

[Claims] After pre-treating the Ti core material or the core material clad with Ti on the outside, it is plated with a noble metal of 0.1μ or more, then solder plated with a thickness of 1μ or more, and then Pb, Sn or P.
A method for manufacturing an electrode, comprising coating b-Sn by a melting method.