Doing More with One Coat: Rethinking DTM Coatings for Indian OEMs & Maintenance
India's Manufacturing Boom is Driving Demand for Simpler, Smarter Coating Systems
India has firmly established itself as one of the world’s fastest-growing manufacturing economies, with its protective coatings market projected to exceed $1.0 billion by 2034. Driven by initiatives such as Make in India and significant national infrastructure investment, demand is accelerating across industrial hubs from Gujarat to Tamil Nadu for coatings that deliver robust corrosion protection while maximising production efficiency.
For industrial OEMs and maintenance suppliers, corrosion protection remains non-negotiable, particularly given India’s challenging environmental conditions, from high humidity and monsoon wet-dry cycles to aggressive coastal air. However, customers are increasingly asking a different question: Can we achieve equal or superior protection with fewer application steps?
This is driving growing interest in Direct-to-Metal (DTM) coatings. By combining adhesion, corrosion protection and finish in a single coat, DTM systems can reduce labour, energy consumption and production cycle times. For formulators, the key challenge is therefore to maintain long-term durability while simplifying the application process.
This shift towards simpler, more efficient coating systems presents a significant opportunity for technologies that can deliver high-performance corrosion protection without the complexity of traditional multi-coat systems.
Productivity and Total Applied Cost: Beyond Paint Price
OEM procurement teams and facility maintenance managers are increasingly evaluating the total cost of protecting steel rather than simply the price per kilogram of liquid paint. Particularly when raw material prices and petrochemical binder costs fluctuate, purchasing decisions must focus on total applied cost per square meter.
A well-designed one-coat DTM system delivers a dual commercial advantage:
For OEM Production: It eliminates paint line bottlenecks, boosts factory throughput, and lowers overall cost via reduced anticorrosive pigment expense and reduced inventory overhead.
For Field Maintenance & Refurbishment: In-service recoating cycles are heavily dictated by the cost of asset downtime and manual labour. By eliminating the need for a separate primer application during routine maintenance, single-coat DTMs cut labour hours and return equipment to service significantly faster, drastically lowering operational disruption.
Rethinking Conventional Corrosion Inhibitor Loadings
Many conventional DTM formulations rely on 8–12% zinc phosphate to achieve the required corrosion standards. While moderately effective, these relatively high additions are costly and deliver a non-differentiated coating to the market.
Intelli-ion® AX1 corrosion inhibitors offer a unique approach. The technology uses a patented ion-exchange mechanism that responds only when corrosion conditions begin to develop. In DTM formulations, effective corrosion protection can often be achieved using loading levels of just 0.5–1.0% (in all coatings chemistries). This drastic reduction frees up formulation space, optimises pigment volume concentration (PVC), and lowers active anticorrosive package costs by up to 65.2%.
Intelli-ion® AX1 also offers a secondary benefit beyond corrosion inhibition: adhesion promotion.
As the coating ages, the additive can promote stronger interaction between the DTM coating and the metal substrate. Through its chemical functionality, Intelli-ion® AX1 can contribute to stronger interfacial bonding at the coating/metal interface, supporting coating integrity and long-term corrosion protection.
Table 1: Conventional vs. Smart DTM Formulations
| Metric / Feature | Conventional DTM | Intelli-ion® AX1 DTM |
|---|---|---|
| Inhibitor Loading | 10–12% zinc phosphate | 0.5–1.0% Intelli-ion® AX1 |
| Formulation Space | Restricted (High PVC load) | Maximised (Low loading footprint) |
| Anticorrosive Package Cost | Baseline (~$2.50/kg avg.) | Up to 65.2% cost reduction |
| Protection Mechanism | Passive anodic barrier | Trigger-released active anodic & cathodic |
| Target Durability | Standard DTM lifecycle | Up to 1,000–1,200 hours Salt Spray |
* Performance dependent on formulation, resin system, dry film thickness, substrate preparation and test conditions.
Delivering High Corrosion Performance in One-Coat Systems
Performance remains the ultimate measure of any corrosion inhibitor. In appropriately formulated DTM systems, Intelli-ion® AX1 has demonstrated 1,000 hours of salt spray performance (ASTM B117) while operating at a fraction of the loading required by conventional inhibitor packages.
By combining corrosion inhibition with adhesion promotion, AX1 can provide formulators with greater formulation flexibility while reducing inhibitor loading and anticorrosive package costs — creating a differentiated route to durable, cost-effective DTM performance.
Intelli-ion® AX1 DTM Test Data Summary
• Salt Spray Resistance (ASTM B117): Passed >1,000 hours with <1.5 mm scribe creepage on shot-blasted steel at 100 µm DFT.
• Coating Integrity: Excellent blister rating (0/S0) and cross-hatch adhesion retention after testing.
• Cost & Performance Efficiency: 0.5% AX1 loading successfully replaced 8% zinc phosphate, reducing raw material inhibitor cost by 65.2% while boosting corrosion resistance.
• Salt Spray Resistance (ASTM B117): Passed >1,000 hours with <1.5 mm scribe creepage on shot-blasted steel at 100 µm DFT.
• Coating Integrity: Even after four days of solvent immersion, the coating containing AX1 remained firmly adhered and could not be removed.
• Cost & Performance Efficiency: 1% AX1 loading successfully replaced 7% zinc phosphate, reducing raw material inhibitor cost by 28.6% while boosting corrosion resistance.
Conclusion
The next generation of DTM coatings will be judged not only by their ability to resist corrosion, but by how efficiently and flexibly they achieve it. Intelli-ion® technology is designed to work across a broad range of coating chemistries, giving formulators the flexibility to incorporate smart corrosion protection into different resin systems and applications.
By combining smart corrosion inhibition with significantly lower inhibitor loading, formulators have the opportunity to reduce anticorrosive package costs, simplify coating systems and maintain the high corrosion performance demanded by today’s industrial OEM and maintenance markets. In a market where every kilogram, every minute and every rupee matters, doing more with one coat is becoming a genuine competitive advantage.