![]() ![]() Stabilized H 2 O 2 in a quantity adjusted to keep a Redox potential of the bath of at least 250 mV Īdditional quantities of ingredients a), c) and e), if necessary, based on analysis of the bath during the process, in order to keep optimal concentrations of the above components and a bath pH up to 1.5.Ģ. and wherein said pickling bath prior to placing said chromium containing stainless steel in said pickling bath comprises the following components:Ī) H 2 SO 4 in an amount of at least 150 g/l ī) Fe +3 ions in an amount of at least 15 g/l ĭ) stabilized H 2 O 2, which develops 130 liters of O 2 /l, in an amount between 1 and 20 g/l Į) non-ionic surfactants or anionic fluorinated surfactants in total amount of about 1 g/l and feeding to the bath during the process:Ī continuous air flow of at least 3 m 3 /h per m 3 bath, through a diffuser distributing the flow in the liquid bath ![]() Pickling process for chromium containing stainless steel comprising placing said chromium containing stainless steel in a pickling bath kept at a temperature ranging from 30° C.
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