Process and plant for descaling, pickling and finishing / passivation of surfaces of strips INOXI-possible steel.
摘要:
A process for descaling, pickling and finishing / passivating stainless steel strips, wherein the strip to be processed is subjected to the following sequence of steps: * a treatment for electrochemically deoxidized, which differs in two units hydraulically using various aqueous solutions, wherein: - said deoxidized uses aqueous solutions containing in the first unit: from 10 to 250 g / l H2SO4; with _ 15 g / l of Fe 3+, Fe 3+ with / Fe 2+> _ 1.0; and in the second unit: from 10 to 250 g / l H2SO4; > _ 2 g / l Fe 3+; with 1.0; induction in the strip of at least one sequence of anode-cathode polarity or anode-cathode-anode applied by electron pairs having the same polarity, between which the strip with time anodic treatment (ta) and density anodic current (I) selected so as to satisfy the relation ta> k + c / I where ta is the anodic treatment time (s); k is an experimental constant, its values ranging from 2 to 15 s; c is an experimental constant, its values ranging from 40 to 120 C / dm 2; and I is ...
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年份:
2002
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