Stainless Steel Passivation: ASTM A967 Chemistry and Validation

Aerospace, medical and food-industry customers require documented passivation of stainless steel components. Industrias Trevigo supplies passivation chemistry per ASTM A967 — nitric and citric acid systems — with validated process parameters and per-batch documentation, supporting plants across Mexico from our base in Monterrey.

Complete passivation process support

Our model covers the full process so you can run passivation in-house with auditable results:

No-cost diagnosis: we evaluate your parts, steel grade (304, 316, 17-4 PH) and the specification your customer requires.
The right chemistry: nitric or citric acid systems per ASTM A967, at validated concentrations for your case.
Documented process parameters: time, temperature and rinse sequence for your operators.
Validation and certification: copper sulfate or ferroxyl testing per batch, with records ready for OEM audits.
If you prefer to outsource, we connect you with qualified applicators in Nuevo León who run our chemistry.

Beyond stainless: passivation for carbon steel, aluminum and zinc

We also formulate temporary rust-preventive passivation for carbon steel between operations (30-90 day protection), conversion coatings for aluminum, and trivalent / chrome-free passivates for galvanized and zinc-plated parts replacing hexavalent chromate.

Frequently asked questions

Do your products comply with ASTM A967?

Yes. Our stainless steel passivation products meet ASTM A967 methods C, D and E, validated with copper sulfate testing. We provide a COA per lot and a documented process guide for your quality department.

Can you passivate parts for us, or only supply the chemistry?

Our core model is chemistry plus full technical support so you run the process in-house with auditable quality. If you need to outsource the operation, we connect you with applicators in the Monterrey area who work with our products.

Do you provide documentation in English?

Yes. SDS, COA, process parameters and validation records are available in English for your corporate quality systems and customer audits.

Setting up or relocating a line in Mexico?

Get a no-cost process diagnosis from our bilingual technical team — we answer in English within one business day.