HX AP-15 Hydrated aluminumzinc silicate phosphate

What Is HX AP-15 Hydrated Aluminum Zinc Silicate Phosphate

HX AP-15 is an advanced hybrid anti-corrosion pigment combining the barrier properties of silicates with the active passivation of phosphates, reinforced by aluminum and zinc ions. This multi-mechanism approach delivers synergistic corrosion protection — silicate forms a durable barrier layer, phosphate provides rapid substrate passivation, and zinc/aluminum ions enhance film density. The result is a universal-grade pigment suitable for the most demanding applications, including automotive OEM and refinish coatings. With an alkaline pH (8.0-10.5), balanced oil absorption (19-31 g/100g), and all applications rated Recommended, AP-15 is the most versatile performer in the HX anti-rust series.

Key Features

• Hybrid Silicate-Phosphate Mechanism — Dual-action corrosion inhibition: silicate barrier + phosphate passivation, reinforced by Zn/Al ions
• Universal Application Range — Validated for all major coating types including automotive OEM and refinish
• Alkaline pH Stability (8.0-10.5) — Naturally compatible with waterborne acrylics, epoxy-amine, and high-pH industrial systems
• Balanced Oil Absorption (19-31 g/100g) — Moderate binder demand allows high loading without viscosity issues
• Multi-Metal Substrate Protection — Effective on steel, galvanized steel, aluminum, and multi-metal assemblies
• Premium Cost-Performance — Automotive-grade protection at industrial pigment economics

Recommended Applications

✅ Recommended  |  ⚪ Suitable  |  ❌ Not Recommended

Technical Data

Packaging

25 kg/bag. Custom packaging available upon request.

Frequently Asked Questions

How does the hybrid silicate-phosphate mechanism work?

AP-15 delivers corrosion protection through two complementary pathways. The silicate component forms a stable, glass-like barrier film on the metal surface — similar to AP-12. Simultaneously, the phosphate component (reinforced by zinc and aluminum ions) provides active passivation — rapidly forming a protective layer at the coating-metal interface before the silicate barrier fully develops. This dual mechanism means AP-15 starts protecting immediately while building long-term durability, making it particularly effective in applications where coated parts may be handled or exposed shortly after painting.

Is AP-15 the best choice if I want a single anti-corrosion pigment for all product lines?

For maximum formulation simplicity, yes. AP-15 is the only grade in the HX series rated Recommended across every application category, including automotive. If your production line runs multiple coating types and you want to stock one anti-corrosion pigment, AP-15 is the logical choice. However, for cost-optimized lines where premium automotive performance is not required, AP-11 delivers excellent results at a lower price point. For exclusively alkaline systems, AP-12’s pure silicate chemistry provides the best long-term pH stability at the lowest cost.

What is the advantage of the hydrated form?

The hydrate structure ensures that active inhibitive species (phosphate and silicate ions) remain chemically available over extended storage periods. In non-hydrated forms, anti-corrosion pigments can slowly lose reactivity as the crystal lattice compacts. The hydration water stabilizes the crystal structure, maintaining consistent performance even after 12+ months of warehouse storage.

Disclaimer — This Technical Data Sheet reflects our best understanding of typical product properties at the time of publication. Listed values are representative of standard production and are not intended as specifications, contractual parameters, or fitness guarantees. Batch variations within normal manufacturing tolerances may occur; users should verify critical parameters against their own requirements before use. Processing methods, formulations, and end-use environments are beyond the manufacturer’s control. The buyer assumes full responsibility for confirming product suitability through its own testing and quality assurance. No intellectual property license is granted or implied. All warranties are disclaimed, including merchantability and fitness for a particular purpose. The manufacturer is not liable for incidental, consequential, or special damages. All sales are governed by the manufacturer’s standard terms, available upon request. This product may contain particles below 0.1 μm.