ELECTRODEPOSITING APPARATUS AND PREPARATION OF RARE EARTH PERMANENT MAGNET

摘要

An electrodepositing apparatus is provided comprising an inner tank (1) filled with an electrodepositing solution, an outer tank (3), a feedback means (4), a rectifying member (5) disposed in the inner tank (1), a means (8) for holding an article (p), a counter electrode (6), and a power supply (9). The electrodepositing solution is circulated in such a way that it overflows the inner tank and is fed back from the outer tank to the inner tank by the feedback means, the flow of the solution is rectified by the rectifying member to keep flat the solution surface in the inner tank, a selected portion of the article is immersed in the solution, and the coating agent is electrodeposited on the selected portion of the article.

主权项

1. An electrodepositing apparatus wherein an article is coated by immersing the article in an electrodepositing solution having a coating agent dispersed or dissolved in a solvent, and applying a voltage between the article and a counter electrode opposed to the article for letting the coating agent deposit on the surface of the article, said apparatus comprising
an inner tank filled with the electrodepositing solution and adapted to effect electrodeposition on the article immersed in the solution, an outer tank enclosing the inner tank so that the outer tank may receive an overflow of the electrodepositing solution from the inner tank, a feedback means for feeding the electrodepositing solution from the outer tank back to the inner tank near its bottom, a rectifying member disposed in the inner tank for suppressing waving of the surface of the electrodepositing solution overflowing from the upper rim of the inner tank, a means for holding the article so that the article may be partially immersed in the electrodepositing solution in the inner tank, a counter electrode disposed in the inner tank and opposed to the article which is held by the holding means and immersed in the solution, and a power supply for applying a predetermined voltage between the article and the counter electrode, wherein the electrodepositing solution is circulated in such a way that it overflows the inner tank into the outer tank and is fed back from the outer tank to the inner tank near its bottom by the feedback means, a selected portion of the article held by the holding means is immersed in the electrodepositing solution in the inner tank, and the power supply is actuated to apply the predetermined voltage between the article and the counter electrode for a predetermined time, whereby the coating agent is electrodeposited on the article surface to form a coating on the selected portion of the article surface.