Surface Engineering Materials
25 years of dedicated expertise in metal surface treatment—chromium-free, phosphate-free, and a complete replacement for hexavalent chromium.
New Eco-friendly Technologies and Materials in the Field of Surface Treatment
The Surface Engineering Materials Division of Desai is dedicated to the independent research, development, and production of environmentally friendly, chromium-free passivators. The product was completed in 2007 and, following expert evaluation in 2010, was recognized as meeting international advanced standards. It is the first domestically developed product to be deployed on a large scale at major steel mills, filling a domestic gap and breaking the product monopoly held by developed countries such as Japan and Germany in this field.
In 2013, Desai’s chromium-free fingerprint‑resistant passivation agent was designated as a key project under the National Revitalization Plan; in 2014, it received both the Hubei Provincial Science and Technology Progress Award and the National Green Manufacturing Science and Technology Progress Award. The product has significantly reduced operating costs for steel mills, accelerated the environmentally friendly substitution of conventional processes in the production of high‑end galvanized sheet, and is widely used in home appliances, automobiles, transportation infrastructure, photovoltaic mounting systems, and other sectors, delivering substantial social and economic benefits.
Technological Advantages
Comprehensive chromium-freeization
Our core products are free of hexavalent chromium and other toxic heavy metals, complying with global environmental regulations.
High corrosion resistance
The neutral salt spray test can last 72 to 200 hours, with a white rust coverage of less than 5%.
Nanomodification Composite Technology
Rare-earth–organosilicon–inorganic hybrid system, forming a dense passivation film.
Multi-functional integration
Fingerprint-resistant, blackening-resistant, high-temperature-resistant, conductive, self-lubricating, with excellent coating adhesion.
The process has strong applicability.
Suitable for various application methods, including dip coating, roller coating, and spray coating, with rapid drying.
Supporting Technical Services
We offer a comprehensive green process transformation solution, enabling a smooth transition from hexavalent chromium to an environmentally friendly system.
Main Products
Chromium-free passivator for zinc‑plated workpieces
Main model
DS980-SX
Key Features
Dip coating/spraying, with excellent corrosion resistance.
Chromium-free passivator for electro-galvanized steel drums
Main model
DS980C
Key Features
Immerse for 10–20 seconds, then allow to dry naturally.
Chromium-free passivator for hot-dip galvanized pipe fittings
Main model
DS995
Key Features
Spray coating process, bright and corrosion-resistant, with excellent resistance to damp heat.
Chromium-free passivator for hot-dip galvanized components
Main model
DS990
DS991
Key Features
High-corrosion-resistant or colorless transparent coating, dip-coating process, natural drying.
Chromium-free fingerprint-resistant passivator for zinc-aluminum-magnesium steel sheets
Main model
DS981XLM-1
Key Features
Coefficient of kinetic friction < 0.15, excellent lubricity, white rust after 96 hours in salt spray ≤ 3%.
Chromium-free passivator for automotive steel with high DURAN value
Main model
DS980-9C-MP
Key Features
The Dyn value is ≥40, meeting the requirements for post‑coating on automotive panels, with excellent high‑temperature resistance and blackening resistance.
Quality Management
Certified to ISO 9001, IATF 16949, and other standards; products have been tested by SGS/CTI and comply with RoHS.
Raw material
Inbound inspection of nanomaterials, silanes, and rare-earth salts
Process
Real-time monitoring of reaction temperature, pH, solids content, and viscosity.
Finished product
Neutral salt spray test (GB/T 10125-2012), film‑forming color difference, adhesion (cross‑cut/ cup‑bend/T‑bend), fingerprint resistance ΔE, blackening resistance, solvent resistance (MEK wipe), surface resistivity
Shipment
A Certificate of Analysis (COA) is provided with each batch, and the shelf life under recommended storage conditions is 3 to 12 months.
Contact Information
Building 12, Huangshi Science and Technology City, No. 149 Aoti Avenue, Tieshan District, Development Zone, Huangshi City, Hubei Province
Email：
Telephone：
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