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High-efficiency active passivation of steel substrates through controlled release of inhibiting ions.
Low toxicity and heavy-metal-free formulation, compliant with RoHS and REACH requirements.
Excellent dispersion stability in epoxy, polyurethane, and alkyd resin systems.
Enhanced long-term corrosion resistance under cyclic salt-spray (ASTM B117) and humidity exposure.
Thermally stable up to 200 °C, supporting high-bake coating processes.
Marine and offshore structural coatings for hulls, decks, and ballast tanks.
Industrial maintenance coatings for oil & gas pipelines and storage tanks.
Automotive chassis and underbody primers requiring durable rust inhibition.
Railway vehicle undercarriage and bogie protection systems.
Wind turbine tower and nacelle protective coatings exposed to harsh environmental conditions.
| Chemical Type | Modified calcium silicate-based active inhibitor |
| Product Form | Fine dry powder |
| Appearance | Off-white to light gray free-flowing powder |
| Primary Applications | Anti-corrosive primers and mid-coats for ferrous metals |
| Key Features | Passivation, low VOC contribution, non-hazardous handling |
| Benefits | Reduced zinc loading, extended coating service life, improved adhesion retention |
| pH (10% aqueous slurry) | 8.5 – 9.2 |
| Particle Size (D50) | 3.2 – 4.0 µm |
Q1: What is the primary corrosion-inhibition mechanism of CATHAYTHERM GA74?
A: CATHAYTHERM GA74 functions primarily through a synergistic passivation mechanism, forming protective complexes with metal substrates—especially steel and aluminum—and enhancing the barrier performance of the coating matrix by promoting stable oxide layer formation at the metal–coating interface.
Q2: Is CATHAYTHERM GA74 compatible with water-based coatings?
A: Yes, CATHAYTHERM GA74 is specially engineered for compatibility with both solvent-borne and water-based systems, including acrylic, epoxy, and polyurethane dispersions. Its surface treatment ensures good dispersion stability and minimal impact on pH or rheology in aqueous formulations.
Q3: How does GA74 compare to traditional zinc phosphate pigments in terms of environmental profile?
A: Unlike conventional zinc phosphate, CATHAYTHERM GA74 is formulated without heavy metals such as lead, chromium, or cadmium, and contains no regulated phosphates requiring special handling or disposal considerations. It supports compliance with evolving global sustainability goals for low-impact corrosion protection.
Q4: What types of industrial coatings benefit most from incorporating GA74?
A: GA74 delivers optimal performance in maintenance and protective coatings for infrastructure, marine equipment, automotive underbody primers, and industrial machinery—particularly where long-term resistance to humidity, salt spray, and cyclic weathering is required without compromising film flexibility or adhesion.
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E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
