Passivex C

Product code: RXSOL-38-2401-025

RXSOL Passivex C is a concentrated, water-based citric acid passivation liquid designed for the chemical passivation of stainless-steel surfaces following fabrication, welding, machining, grinding, pickling or cleaning.

The product removes surface contamination and assists in the removal of free iron and other iron-containing residues from stainless-steel surfaces, promoting the formation and restoration of a stable chromium-rich passive oxide layer.

Unlike conventional nitric-acid passivation products, RXSOL Passivex C uses citric acid technology and is suitable for applications where a nitric-free passivation process is preferred.

ASTM A967/A967M specifically recognizes Passivex C immersion treatments as chemical passivation treatments for stainless-steel parts.

Application

RXSOL Passivex C can be used for passivation of:
  • Austenitic stainless steel
  • 300-series stainless steel
  • 304 / 304L stainless steel
  • 316 / 316L stainless steel
  • Stainless-steel tanks
  • Stainless-steel piping
  • Process vessels
  • Heat exchangers
  • Pumps
  • Valves
  • Stainless-steel fabrication
  • Food-processing equipment
  • Pharmaceutical equipment
  • Chemical-processing equipment
  • Marine stainless-steel equipment
  • Welded stainless-steel assemblies
  • Typical post-fabrication applications
 
Particularly useful after:
  • Welding
  • Grinding
  • Polishing
  • Machining
  • Cutting
  • Fabrication
  • Pickling
  • Removal of fabrication contamination

Dosage

How does Passivation using RXSOL Passivex C work?

Stainless steel naturally develops a thin, chromium-rich passive oxide film when exposed to suitable oxidizing conditions.
 
During fabrication, however, the surface may contain:
  • Free iron
  • Embedded carbon steel particles
  • Iron oxide
  • Grinding debris
  • Welding contamination
  • Machining residues
  • Surface deposits
 
These contaminants can initiate localized corrosion and reduce the corrosion resistance of the stainless-steel surface.
 
RXSOL Passivex C provides a controlled citric-acid treatment that helps remove undesirable metallic contamination and supports formation of the passive chromium oxide film.