Zinc, Iron & Tricationic Phosphating: Chemicals and Process Support

Phosphating is the standard conversion coating before powder coating, e-coat and liquid paint. Industrias Trevigo formulates and supplies phosphating chemistry — zinc, iron and tricationic — and supports your line in Mexico with bath analysis, coating weight validation and troubleshooting, in English or Spanish.

What we supply and support

We cover the complete pretreatment sequence used by automotive and general manufacturing plants:

Alkaline cleaners and degreasers matched to your soils and substrate.
Zinc phosphate systems (crystalline coating, automotive standard) with accelerators and refiners.
Iron phosphate systems for lighter-duty applications and combined cleaner-coaters.
Tricationic zinc-nickel-manganese systems for high-spec OEM requirements.
Post-treatment sealers, including chrome-free options compliant with RoHS and OEM restrictions.

Process support that keeps audits clean

Our technical team runs weekly bath control (concentration, free/total acid, accelerator), validates coating weight per your customer specification, and documents everything so your quality team has audit-ready records. When adhesion or salt-spray failures appear, we troubleshoot the line stage by stage instead of just shipping more chemical.

Why nearshoring plants work with us

We are based in the Monterrey metropolitan area — the region where North American manufacturing is concentrating — with 35+ years supplying the Mexican automotive and metalworking supply chain. Local inventory, deliveries in drums, totes or bulk, SDS and COA documentation with every shipment, and a bilingual technical team your U.S. engineering staff can talk to directly.

Frequently asked questions

Do you support lines to automotive OEM specifications?

Yes. Our zinc and tricationic phosphate systems are run daily against automotive coating-weight and salt-spray requirements. We provide the process parameters, per-batch documentation and validation testing your OEM audits require.

Can you help us start up a new phosphating line in Mexico?

Yes. We support line start-ups end to end: bath make-up calculations, initial charging, parameter definition, operator training and the first weeks of intensive bath control until the process is stable.

Do you offer chrome-free sealers?

Yes. We formulate trivalent-chrome and fully chrome-free (zirconium-based) post-treatments that meet RoHS, REACH and OEM restrictions while matching the corrosion performance of traditional chromate sealers.

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.