Products/Services for Citric Passivation Equipment

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It has been traditionally thought that passivation is the standard method of cleaning stainless steel; when in fact passivation is not a cleaning process at all. The passivation process removes any residual carbon from the surface of the part by the use of nitric or citric acid. The acid dissolves...

...the passive layer,. the mark should be passivated using nitric or citric acid but the process must be thoroughly developed in order to prevent. over-etching the mark beyond readability....

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  • A next generation, pilot-scale continuous sterilization system for fermentation media
    Equipment was citric acid- passivated after installation.
  • Citric Acid
    This process is useful for cleaning and passivating steel equipment such as steam electric generators, pipelines, heat exchangers and tanks.* In the Citrosolv process, ammoniated citric acid (pH 3.5-4.0) is used to clean the iron oxide from the metal …
  • ZCP2007MST3795
    Which method is best to use depends on the equipment available and the amount of welds that … Problematic for Passivation The introduction of citric acid passivation has allowed good corrosion resistance even for difficult grades of stainless steel that nitric acid could not do an effective job with.
  • ZASMHBA0004143
    Citric acid is also used in dilute solution to scavenge residual iron oxide from boilers after HCl cleaning in order to facilitate passivation treatment. … disperse various oils, greases, and organic contaminants from new steel or stainless steel equipment , such as drum …
  • ZCP2007MPMD219
    An average of 5.10 EU/ml endotoxin was recovered from extracts of coupons passivated by 30% nitric acid and 11.40 EU/ml in the case of 10% citric acid. … as the endotoxin present at even 1:1 dilution was below the detection limit of the equipment .
  • CR4 - Thread: Passivation Process for SS316L+304
    With citric , it's hard to over passivate and it won't etch the steel like nitric can so it's hard to over passivate. Electropolishing requires equipment that most people don't have.
  • Corrosion in bioprocessing applications
    Warm, dilute citric acid passivation also is effective in removing weld heat tints without the waste disposal problems of nitric-HF acid solutions [27, 97]. … maintenance (i.e., repair and downtime) costs must be evaluated when selecting alloys for equipment fabrication [107].
  • ZASMHBA0004103
    Although citric acid passivation tends to yield higher chromium/iron ratios, it does not dissolve as much polishing debris from the grit lines. Surface Finish Pharmaceutical equipment is normally specified with either mechanically polished or electropolished surfaces.
  • Citric acid
    Citric acid, because of its low toxicity, relative noncorrosiveness, and biodegradability, is also being used for applications … These include preoperational and operational cleaning of iron and copper oxides from boilers, nuclear reactors, and heat exchangers; passivation of stainless steel tanks and equipment ; and etching of concrete floors prior to coating.
  • CR4 - Thread: Nitric Acid or Citric Acid for Passivation of Stainless Steel?
    The Citric Acid treatment has the advantage of less hazardous. The Nitric Acid based pickling is covered under ASTM A380 ( Practice for Cleaning, Descaling and Passivating of Stainless Steel Parts, Equipment and Systems).


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Able Electropolishing Company, Inc.
Able Electropolishing Company, Inc.
Able Electropolishing Company, Inc.
Able Electropolishing Company, Inc.