Passivation

The Process

1. Surface Preparation & Degreasing
   All stainless-steel surfaces are first thoroughly cleaned and degreased to remove oils, shop residues, fabrication contaminants, and handling debris. Cleaning methods are selected based on surface condition and application (spray, wipe-down, or circulation).
   • Removes organic contamination
   • Prepares surface for chemical treatment
   • Verified using visual checks and water-break testing
2. Oxide & Weld Treatment (When required)
   Where welding, heat tint, or oxide scale is present, affected areas are treated using controlled descaling or pickling methods prior to passivation. This step removes chromium-depleted layers created during welding or heat exposure and ensures a uniform, corrosion-resistant surface can be restored.
   • Applied only where needed
   • Prevents localized corrosion risks
   • Followed by thorough rinsing
3. Chemical Passivation
   Passivation is performed using a controlled chemical process to remove free and embedded iron and promote formation of a stable chromium oxide passive layer. Chemistry, concentration, temperature, and contact time are matched to stainless steel grade (304 / 316 / 316L), industry requirements, and client specifications.
   • Restores corrosion resistance
   • Improves hygienic performance
   • Extends equipment service life
4. Rinsing, Neutralization & Drying
   After passivation, all surfaces are rinsed until near-neutral conditions are achieved. Spent solutions are neutralized and handled in accordance with environmental and regulatory requirements. Equipment is then dried using clean methods to prevent recontamination and allow the passive layer to stabilize.
   • Neutral pH verification
   • Proper waste handling
   • Controlled drying
5. Inspection & Verification
   Final inspection verifies passivation effectiveness. Where specified, recognized acceptance tests confirm removal of iron contamination and surface cleanliness. Documentation can be provided upon request.
   • Visual inspection
   • Industry-recognized test methods
   • Documentation available

Where It’s Applied

• New fabrication
• Post-welding or grinding
• After polishing
• During shutdowns & turnarounds
• Corrosion remediation

What We Passivate

Fortis Industrial Solutions provides chemical passivation services to restore the protective chromium oxide layer on stainless steel surfaces after fabrication, welding, polishing, or repair. Our services support hygienic operation, corrosion resistance, and long-term equipment performance in demanding sanitary environments.

• Process & storage tanks
• Skid-mounted systems & modules
• Sanitary piping & tubing
• CIP systems & flow panels
• Weld repairs & field modifications
• Polished or mechanically finished surfaces