JPS5913097A - Material for insoluble anode for electroplating - Google Patents

Abstract

PURPOSE:To obtain a material for the titled insoluble anode consisting of prescribed percentages of Fe, Ni and Ti and having superior workability, electric conductivity and durability. CONSTITUTION:An alloy consisting of, by weight, >=5% Fe, >=10% Ni, 20-40% (Fe+Ni) and the balance Ti is refined, and the alloy is worked to obtain a material for an insoluble anode for electroplating. The material is easy to work, reduction of the electric conductivity due to the formation of a passive film on the surface is prevented, and the material has superior durability.

Description

DETAILED DESCRIPTION OF THE INVENTION In the present invention, electrodes, copper electrodes, etc. used in electroplating such as zinc plating, tin plating, nickel plating, and copper plating have been widely used. However, these electrodes dissolve due to electrolytic dissolution and chemical dissolution during plating. Therefore, the electrode wears out as it is plated, so if the distance between the plating material and the electrode (distance between the electrodes) is not kept constant during plating, the quality of the plated product will vary, so the distance between the electrodes must be kept constant. This creates a complicated process in which the electrodes must be adjusted or replaced frequently depending on the degree of wear.

Furthermore, while the dissolution of these electrodes has the advantage of replenishing metal ions into the plating bath, depending on the plating speed, the metal ions in the plating bath may increase too much, which may have a negative effect on the quality of the plated material. There are also drawbacks such as the need to remove these dissolved metal ions.

In order to solve these drawbacks, a conventional method has been used for electroplating using an anode material that is very unlikely to be dissolved by electrolytic dissolution or chemical dissolution, that is, an insoluble anode. However, there are currently few insoluble anode materials in such plating methods that are completely satisfactory, resulting in various drawbacks.

For example, in galvanizing, a lead-tin alloy is used in some cases as a positive material, but if a small amount of lead ions eluted from this anode into the plating bath are contained in the plating layer, the plating material may is known to have various adverse effects on the performance of

Therefore, there are drawbacks such as the need to take troublesome methods such as removing lead ions deposited in the plating bath.

In addition, electrodes made by plating titanium with platinum (thickness 3 to 5 μm) are used for tin plating or zinc plating, but even with this platinum plating, the cost of platinum plating is quite high, and Because platinum is soft, the platinum plating layer is not only dissolved by electrolysis but also peeled off by polishing etc. due to the solid floating matter (sludge) generated in the plating bath, and its lifespan is not very long, making it difficult to improve economic efficiency and There is a problem in terms of the complexity of replacing electrodes.1゜The present invention solves the problem of electrolysis of zinc anodes, copper anodes, nickel anodes, and copper anodes (due to the drawbacks caused by the electrolysis of zinc anodes, copper anodes, nickel anodes, and copper anodes) and the insoluble anodes currently used in some cases. The purpose is to provide a positive material that solves the drawbacks, and its gist is that it contains 51 or more iron (by weight), 1096 or more nickel, and the total amount of iron and nickel is 20 ~40%, with the remainder consisting of titanium and non-sewable impurities.

Next, the details of the present invention will be described below.

Titanium is used as the electrode base material of the present invention. Titanium is light, strong, easy to work with, and has good corrosion resistance. However, when titanium is used as an electrode material for a long time,
Forms a passive film on the surface to reduce electrical conductivity. In order to prevent this deterioration, iron and nickel are mixed. Iron is a cheap and effective component that makes titanium □ conductive, with a 5%
If the content is less than that, the effect cannot be obtained. In addition, nickel prevents cracks that occur during the cooling process of molten titanium and iron after casting, and because it has a higher natural potential than iron, it significantly improves electrical conductivity and significantly reduces the amount of waste when energized. It has a suppressive effect.

The effect is ensured at 10% or more. The effects of these iron and nickel are enhanced by increasing their blending amounts, but excessive blending suppresses the effects of titanium.

Therefore, the blending amount can be adjusted without losing the effect of titanium.
The amount was limited to 20 to 40% to provide the necessary electrical conductivity and the effect of suppressing electrical consumption as an electrode material.

Since the anode electrode according to the present invention is dissolved in the plating solution in extremely small amounts when energized, the performance of the plating material v
cE! It has the advantage of having relatively little impact.

An example will be described below.

As shown in Table 1.1, the amount of wear of each electrode during energization (the weight loss of the electrode is expressed as the thickness The electrode of the present invention is easy to mold and is excellent in terms of energization state and amount of wear during energization.

Claims (1)

[Claims] (1) Insoluble for electroplating characterized by containing 5% or more (wt%) of iron, 10% or more of nickel, and a total amount of 20 to 40%, with the remainder consisting of titanium and inevitable impurities. Anode material thorn.