Abstract: A method for the electrodeposition coating of an article by use of an alternating current, characterized in that an electrodeposition coating vessel is filled with an aqueous solution or dispersion of an electrodeposition coating composition, which contains as a paint binder (i) a salt of a polycarboxylic acid resin containing 5 wt% or less of low molecular weight acidic impurities, or (ii) a salt of a nitrogen-containing basic resin containing 5 wt% or less of low molecular weight basic impurities, an article to be coated having an electrode area of S.sub.1 and an opposite electrode having an electrode area of S.sub.2, the electrode area ratio S.sub.1 /S.sub.2 being 1.5 to 300 are immersed in the above vessel, and an alternating current is impressed between the article to be coated and the opposite electrode, thereby depositing the aforesaid electrodeposition coating composition onto the article to be coated.

Abstract: A rectifier comprising a vessel filled with an aqueous solution or dispersion of a purified polyelectrolyte, and two electrodes immersed therein, wherein the ratio S.sub.1 /S.sub.2 of the area S.sub.1 of one electrode at the portion immersed in the aqueous solution or dispersion to the area S.sub.2 of the other electrode at the portion immersed in the aqueous solution is from 1.5 to 300. When the electrode having the immersed area S.sub.1 in the rectifier is connected through input terminals to an alternating current source, a direct current is obtained through output terminals from the other electrode.