JPS6195242A - Method for evaluation test of electroplating solution - Google Patents

Abstract

PURPOSE:To make it possible to perform an evaluation test even with respect to a plating solution of which the composition changes by air stirring, by using a plating tank having a truncated cone shape and rotating a test piece at constant angular velocity. CONSTITUTION:A conductor 2 is laminated to the entire inner peripheral wall of a plating tank 1 having a truncated cone shape to form an anode and a plating solution, of which the composition changes by air stirring, for example, a plating solution of an alloy such as Fe-Zn, Fe-Ni or Fe-P is injected in said plating tank 1. The lower end part of a columnar shape test piece 3 is immersed in this plating solution and plating is performed while said test pieces 3 is rotated at definite angular velocity. An Fe-Zn alloy is precipitated on the test piece after the completion of plating and the characteristics of the plating solution is evaluated from plating appearance such as throwing power or gloss. By this method, current density can be continuously determined on the test piece and a diffusion layer can be reduced without performing air stirring.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a testing device for evaluating and testing plating solutions containing plating solutions that cannot be stirred with air.

(Prior Art) The Hull cell test method is generally known as an evaluation test method for electroplating solutions. The Hull cell test method is a method in which plating is performed while stirring the plating solution with air, and then the properties of the plating solution are evaluated from the appearance of the plating, such as current density, throwing power, and gloss. If you want to evaluate a plating solution whose composition does not change due to air agitation, you can use this method, but if the composition changes, the problem described below will occur. Plating was performed using a cathode ronka single method without air agitation, and the results were evaluated.

Plating liquid whose composition changes by air agitation, for example, Fl! -2n alloy plating solution.

When air agitation is performed, the reaction of Fe2+→Fe"+e- is promoted and the composition of the plating solution changes significantly.

Such changes in the plating solution affect the plating efficiency and physical properties of the plating film, making it impossible to perform accurate evaluation tests.

(Problems to be Solved by the Invention) The present invention solves problems that could not be evaluated using conventional methods, including plating solutions whose composition changes with air agitation and plating solutions whose composition does not change. It provides a method for evaluating and testing characteristics.

In order to solve the above object, the present invention comprises a truncated cone-shaped plating tank and a cylindrical test piece, and the plating tank is filled with a plating solution. The method consists of the following steps: using the anode for plating inspection and the cathode on the test piece side, performing plating while rotating the test piece at a constant angular velocity, and then evaluating the appearance of the test piece.

(Function) Since the present invention consists of the above-mentioned steps, the test piece placed in the plating solution in the truncated conical plating tank is rotated so that the diffusion layer becomes smaller. Since the plating solution is brought into contact with the plating solution, plating can be performed without promoting the reaction described above, even when the plating solution changes due to air agitation.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

A conductor 2 is attached to the entire circumference of the inner wall of the truncated conical plating tank 1 to form an anode. In the plating tank 1, there is a material whose composition can be changed by air agitation, such as Fe-Z.
Inject alloy plating solution such as n, Fe-Ni, Fe-P, etc.

The lower end of the cylindrical test piece 3 is immersed in the plating solution, and the test piece 3 is rotated around its axis at a constant angular velocity by an appropriate means (not shown). Test piece 3 is used as a cathode.

Note that a °C heater 4 is attached to the bottom of the plating tank 1 if necessary.

[Test example]

In a truncated conical plating barrel, Fe-Zn alloy plating solution A,
BC is prepared, and a current of 2 to 20 A is applied to the anode for 5 to 20 minutes.
The minutes flowed by.

The diameter of the test piece was 1.01, and the depth of immersion of the test piece into the plating solution was 10.0 rIn.

The test piece was subjected to 30 to 180 rotations per minute. The current density was 0.2 to 100 A/dm''.

On the plated test piece, there was precipitation of Fe-Zn alloy, and the current density range in which good plating could be obtained in terms of throwing power and gloss was as follows.

(Effect JA!:) Since the method of the present invention uses a truncated conical plating bath, it is possible to continuously measure the current density on the test piece, and the test heath is moved at a constant angular velocity. Since the diffusion layer can be made small without air agitation, evaluation tests can be performed even on plating solutions whose composition changes due to air agitation.

[Brief explanation of drawings]

The figure is a schematic diagram of the apparatus used in the method of the invention. 1...Plating tank 3...Test Heath

Claims (1)

[Claims] (1) It consists of a truncated cone-shaped plating tank and a cylindrical test piece. Plating liquid is poured into the plating tank, the plating tank side is used as an anode, the test piece side is used as a cathode, and the test piece An evaluation test method for an electroplating solution, which comprises performing plating while rotating the test piece at a constant angular velocity, and then evaluating the appearance of the test piece.