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Andritz AG
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Andritz AG
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Priority to ES531240ApriorityCriticalpatent/ES8503730A1/en
Publication of ES531240A0publicationCriticalpatent/ES531240A0/en
Publication of ES8503730A1publicationCriticalpatent/ES8503730A1/en
Cleaning And De-Greasing Of Metallic Materials By Chemical Methods
(AREA)
Abstract
Pickling process for alloy steels, copper, non-ferrous heavy metal alloys, special alloys, titanium, zirconium, tantalum, etc. employs a nitric acid bath, opt. contg. other acids (e.g. hydrofluoric acid), to which urea or an aq. urea soln. is added, the urea supply being metered directly by a NOx detector, operating continuously in the exhaust gas conduit, and a regulator (e.g. as P.I (0/0)
ES531240A1984-04-031984-04-03Nitric acid pickling process
ExpiredES8503730A1
(en)
Process for the chemical conversion of metallic substrates, conversion bath adapted to be used in the same process and concentrate adapted for the preparation of the bath