Gentle passivation liquid for safe metal passivation without toxic fuming
Application & Uses
- 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
- Welding
- Grinding
- Polishing
- Machining
- Cutting
- Fabrication
- Pickling
- Removal of fabrication contamination
Dosage & Directions for Use
How does Passivation using RXSOL Passivex C work?
- Free iron
- Embedded carbon steel particles
- Iron oxide
- Grinding debris
- Welding contamination
- Machining residues
- Surface deposits
Technical Specifications & Properties
| Property | Typical Value |
|---|---|
| Appearance | Clear, colourless to slightly yellow liquid |
| Odour | Mild acidic |
| Chemical type | Organic acid |
| pH, neat | Typically ~1.5-2.0 |
| Specific gravity @ 25°C | Typically ~1.12-1.16 |
| Water solubility | Completely miscible |
| Foam | Low |
| Flash point | Not applicable / non-flammable aqueous solution |
| VOC | Negligible |
| Corrosivity | Acidic; handle accordingly |
| Physical state | Liquid |
Recommended Industrial & Shipboard Areas
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In many applications, thorough water rinsing is sufficient to stop the acid treatment.
A separate neutralization step may be used when required by the validated process.
If neutralization is employed, it should be validated to ensure that the treated stainless-steel surface still meets the required passivation acceptance criteria. ASTM A967 recognizes rinsing with or without a separate neutralization treatment.
Product Description & Chemical Profile
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.
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