Passivation of austenitic stainless steel surfaces has been practiced on large purity h2o techniques for many many years, and is commonly outlined as the removal of iron and iron compounds from the floor to increase the passive movie and maximize corrosion ressistance. The floor chemistry, structure and linked corrosion resistance of austenitic stainless steel is impacted by mechanical sharpening, welding, and most fabrication procedures.
Nitric passivation cuts down or eliminateds this damage though forming a extra corrosion resistant passive movie large in chromium oxide. There have been many technological papers that have presented proof on success of passivation and particularly for the added benefits of citric passivation chelant procedures (1-4). Weld parts create relatively large corrosion charges unless handled and fixed by chemical passivation.
Most large-purity h2o techniques are passivated with the method of circulating heated alkaline cleaning and citric acid passivation chemistries as described in other reference files (4). The method of gel nitric .0passivation of welds has been carried out for extra than fifty many years. Citric acid has been made use of for this handled type in latest many years. Posted knowledge to ensure citric-primarily based gel’s success of passivation on the weld spot at ambient conditions as in contrast to nitric acid passivation gel techniques is not commonly out there.
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