Patent ID: 9458546
Filing Date: 2016-10-04
CPC Classification: C25D

Claim Text:
1. A method of providing plasma electrolytic oxide coating to a valve metal article, comprising the steps of: a) exposing a first section of the entire surface area of said valve metal article to an electrolyte by i) inserting the first section into a first electrolyte bath and inserting a second electrolyte bath inside said valve metal article, or ii) inserting the second electrolyte bath inside said valve metal article; b) inducing a first localized plasma reaction on the exposed first section; c) extracting said first section of the entire surface area from said electrolyte by i) removing the second electrolyte bath inside said metal valve article from the first section and removing the first section from the electrolyte bath or ii) removing the second electrolyte bath inside said metal valve article from the first section; d) exposing a second section of the entire surface area of said valve metal article to said electrolyte by at least one of i) inserting the second section into the first electrolyte bath and ii) moving the second electrolyte bath inside said valve metal article; and e) inducing a second localized plasma reaction on the exposed second section, wherein inserting a second electrolyte bath inside said valve metal article comprises inserting a structure that, in combination with the valve metal article forms a closed space holding the second electrolyte bath inside said valve metal article and wherein removing the second electrolyte bath inside said metal valve article from the first section comprises moving the closed space holding the second electrolyte bath inside said valve metal article.