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 Selection Workflow
1
Process & Requirement Definition
Map the unit operation and define the functional, purity, and regulatory requirements the chemical input must meet.
2
Chemistry & Grade Selection
Match the solvent, intermediate, acid or base, catalyst, or specialty additive to the process and downstream compatibility.
3
Trial & Specification
Validate performance at bench or pilot scale, and set the grade, treat rate, and packaging to match throughput and handling.
4
Quality & Supply Assurance
Lock the spec with a CoA and secure multi-origin sourcing for supply resilience and consistent lot quality.
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