Why It Matters
Fabrication, medical-device, food-equipment and aerospace shops passivate stainless steel per ASTM A967/AMS 2700 using nitric- or citric-acid chemistry. The process is built around nitric- or citric-acid passivation chemistry and the relevant specs.
Solution Approach
Fabrication, medical-device, food-equipment and aerospace shops passivate stainless steel per ASTM A967/AMS 2700 using nitric- or citric-acid chemistry. The process is built around nitric- or citric-acid passivation chemistry and the relevant specs. RawSource supplies the base chemicals that go into these programs. We can help with product selection, grade matching, and sourcing from multiple origins for supply security.
Typical Treatment Workflow
1
System Assessment
Characterize operating conditions—fluid composition, temperature, pressure, flow rates—and benchmark current treatment performance.
2
Chemistry Selection
Match base chemicals to your operating envelope. Factor in compatibility with existing programs, regulatory constraints, and downstream impacts.
3
Dosage & Delivery
Determine optimal treat rates through jar testing or field trials. Configure packaging (drums, totes, ISO tanks) to match consumption and storage logistics.
4
Monitoring & Adjustment
Track KPIs—coupon rates, residuals, separator performance, water quality. Adjust chemistry and dosage as conditions change.
Recommended Chemistries (3)
Citric Acid (Anhydrous, FCC Food Grade)
CAS 77-92-9
Acids & Salts
Chelation / Sequestration
Chelating acid that selectively removes surface iron to grow the passive chromium oxide, a milder and greener route than nitric; in catalog
Melting Point: 153 °C (anhydrous) Boiling Point: Decomposes Density: 1.54 at 20 °C
Full Details
Nitric Acid 67% 42 Baume Tech
CAS 7697-37-2
Acids & Salts
pH Adjustment
2031 (NITRIC ACID, OTHER THAN RED FUMING) · Class Oxidizing acid that dissolves free iron and promotes a chromium-rich passive oxide per ASTM A967; in catalog
Melting Point: -42 °C Boiling Point: 83 °C at 760 mmHg Density: 1.5 at 25 °C
Full Details
Caustic Soda (Sodium Hydroxide) Beads
CAS 1310-73-2
Acids & Salts
Primary alkali for industrial cleaning
1824 (SODIUM HYDROXIDE SOLUTION) · Class Sodium hydroxide for the alkaline degrease/pre-clean that removes oils before the passivation bath; in catalog
Melting Point: 318 °C Boiling Point: > 130 °C at 760 mmHg Density: 1.5 at 20 °C
Full Details