FOERFARANDE FOER AVLAEGSNADE AV OXIDSKIKT OCH SPAAN FRAAN METALLER OCH METALLEGERINGAR, SPECIELLT LEGERADE STAAL, HOEGLEGERADE STAAL OCH KOLSTAAL I ETT BETBAD INNEHAALLANDE JAERN(III)JON SOM AKTIV INGREDIENS

摘要

In a process for scale and oxide removal from metal (alloys), esp. (high) alloy steels and carbon steels, by a batch method or in systems with continuous transport equipment, the novelty is that the metal parts are pickled in one or more steps in an aq. iron chloride-sulphate and/or iron (III) chloride and/or iron (III) sulphate soln. which contains 15-200 g/l Fe(3+) ions and is either acid-free or contains max. 5 wt.% mineral acid, at 20-80 (pref. 40-60) deg.C for 3-40 (pref. 10-30) mins..