Water-based Epoxy MIO Intermediate Coat for Steel Structures
Water-based Epoxy MIO Intermediate Coat is a two-component water-borne epoxy coating composed of secondary dispersion epoxy emulsion, micaceous iron oxide (MIO), professional functional additives and modified amine water-based curing agent. The product uses pure water as diluent, featuring low odor and non-flammable properties. Each coating pass forms a dry film thickness of around 70μm, serving as the intermediate protective layer for heavy-duty anti-corrosion coating systems in industrial and infrastructure steel structure projects.
What Is Water-based Epoxy MIO Intermediate Coat
Water-based Epoxy MIO Intermediate Coat is a dedicated two-component water-based intermediate coating for steel anti-corrosion systems. It integrates the stable film-forming performance of secondary dispersion epoxy emulsion and the physical shielding structure of lamellar micaceous iron oxide fillers.
After curing, internal MIO particles form parallel overlapping layered structures, building a dense physical barrier layer. This structure blocks vertical penetration of water vapor, salt ions and various corrosive media. It can form stable bonding with underlying epoxy primer and provide a flat, stable base for subsequent topcoat construction, unifying the entire coating system into a complete anti-corrosion protective layer.
Key Technical Specifications
| Parameter |
Details |
| Product Type |
Two-component water-based epoxy coating |
| Main Components |
Secondary dispersion epoxy emulsion + micaceous iron oxide + modified amine curing agent |
| Diluent |
Water |
| Application Method |
Airless spray / Air spray |
| Water Addition (Airless Spray) |
10% – 15% |
| Water Addition (Air Spray) |
15% – 20% |
| Dry Film Thickness |
Approx. 70μm per coat |
| Drying Method |
Ambient air drying or low-temperature baking |
Core Performance Characteristics
Non-Flammable & Low Odour: Solvents are replaced with water avoiding fire hazard. Low odour. Suitable for tanks, pipe racks and restricted areas.
Flexible Drying: Room temp or low temp bake air dry. Works with air spray and airless spray.
MIO Barrier Protection: Micaceous iron oxide creates overlapping lamellae to delay corrosive penetration to steel.
Stable Toughness: Impact and friction resistant in mechanical contact.
Interlayer Compatibility: Works with most epoxy primers and anti-corrosion topcoats, preventing peeling, blistering and delamination.
Suitable Applications
This intermediate coating is widely used for intermediate anti-corrosion protection of industrial and infrastructure steel structures, covering the following mainstream scenarios:
Petrochemical Facilities — Steel pipelines, pipe support frames, storage tanks and gas storage equipment
Bridge & Building Steel Structures — Long-span bridges and various building load-bearing steel frameworks
Industrial Mechanical Equipment — Industrial tanks, pressure vessels and mechanical outer shells
Marine & Port Facilities — Steel components serving in coastal salt spray corrosion environments
Special Structure Protection — Containers and partial concrete surfaces requiring anti-corrosion and stable film performance
Role in a Three-Coat Anti-Corrosion System
In a standard primer-intermediate-topcoat three-layer anti-corrosion system, the intermediate coat undertakes the function of connecting and reinforcing the whole coating structure.
This Water-based Epoxy MIO Intermediate Coat stably bonds with the underlying primer and provides a compatible surface for the topcoat. The single-layer 70μm dry film thickness increases the overall coating thickness. When the topcoat has local scratches or damage, it can block corrosive media in advance and avoid direct corrosion of the steel substrate. The MIO shielding structure, film toughness and stable interlayer adhesion jointly maintain the long-term stability of the whole anti-corrosion system.
Quality and Certifications
JOSME implements full-process quality management, including raw material incoming inspection, production process monitoring and finished product performance testing. Batch sample retention is adopted to ensure consistent color and film performance of each production batch.
We hold ISO 9001, ISO 14001, ISO 45001, ISO 50001 system certifications, together with China Environmental Labelling Certification and China Green Product Certification. Complete supporting documents such as MSDS and test reports can be provided for export projects.
Packaging and Delivery
We provide standard and customized packaging solutions. All export orders adopt reinforced ocean freight packaging to avoid damage and leakage during long-distance transportation.
Standard products can be delivered within 2–3 working days. Custom color matching and private-label orders take 7–15 working days for production. We support sea, air and land freight services to meet different transportation demands.
Frequently Asked Questions
Q1: What is the protective principle of MIO in this coating?
A1: After curing, micaceous iron oxide forms parallel overlapping lamellar structures. This physical structure prolongs the penetration path of water vapor, salt ions and corrosive media, achieving passive anti-corrosion shielding for steel substrates.
Q2: Is this coating applicable for confined space construction?
A2: Yes. The product uses water as the only diluent with no flammable risks and low construction odor, which meets the safety construction requirements of enclosed spaces such as storage tanks and pipe racks.
Q3: What are the standard construction dilution ratios?
A3: For airless spray construction, the water addition ratio is 10%–15%; for air spray construction, the ratio is 15%–20%. The coating can be naturally air-dried or low-temperature baked after construction.
Q4: Can you provide private label and customized services?
A4: Yes. We support custom color matching, formula adjustment and private-label packaging services. The production cycle of customized orders is 7–15 working days according to specific requirements.
Q5: Why is MIO intermediate coat necessary for heavy-duty anti-corrosion systems?
A5: It increases the overall coating thickness and forms a dense physical shielding layer. It makes up for the insufficient protection of single-layer primer and topcoat, and improves the adhesion and stability of the entire coating system.
Contact Us
For product parameter consultation, project technical guidance, sample application and bulk procurement of Water-based Epoxy MIO Intermediate Coat, please contact our professional team via [email protected].
