The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 19, 1998
Filed:
Aug. 01, 1996
Frank A Ludwig, Rancho Palos Verdes, CA (US);
Other;
Abstract
A method for monitoring the constituents present in conversion coating bath solutions. The method involves using specific ac and dc voltammetry and using platinum or other noble metal working electrodes. First, a selected dc potential is applied to a working electrode which has been subjected to pretreatment and which is present as an in-tank sensor in the bath being analyzed. A constant ac signal is superimposed on the dc potential. The dc potential is then swept over a chosen range at a selected sweep rate. The various constituents in the bath are then monitored by measuring dc current and the ac current at one or more reference phase angles with respect to the constant ac signal between the working electrode and a reference electrode as the dc potential is varied. The resulting dc and ac spectra provide a useful measurement of the make-up of the constituents in the bath solutions.