METHOD FOR COLLECTING COMPONENT OF CHEMICAL CONVERSION TREATMENT LIQUID DURING CHEMICAL CONVERSION TREATMENT

摘要

PROBLEM TO BE SOLVED: To provide a method for inexpensively and easily collecting a component of a chemical conversion treatment liquid which is trapped and carried out by an article to be treated, without being affected by a form of a chemical treatment process.;SOLUTION: The chemical treatment process includes the steps of: making the article to be treated contact with the chemical conversion treatment liquid in a chemical conversion coating tank 28; making the article contact with a collecting liquid in a tank 33 for collecting the chemical conversion liquid; and subsequently rinsing the article to remove the chemical conversion liquid and collecting liquid trapped thereon, in a rinsing step using three-stage rinse tanks 29, 30 and 31. The collecting method comprises the steps of: continuously feeding one part of the liquid drained from the first rinse tank 29 to the tank 33; adjusting an amount of the liquid to be fed to the tank 33 so that a quotient of a concentration of the component in the chemical conversion liquid in the tank 33 divided by a concentration of a component in the chemical conversion coating liquid in the chemical conversion coating tank 28 can be 0.3 to 0.7; collecting at least one part of the collecting liquid which overflows from the tank 33; and feeding it to the chemical conversion coating tank 28.;COPYRIGHT: (C)2007,JPO&INPIT