Epoxy Anticorrosion Powder Coating for Reinforcing Steel Bars
We are a manufacturer based in China, specializing in high-quality Epoxy Anticorrosion Powder Coating for Reinforcing Steel Bars for industrial clients worldwide. Technical support and custom formulation available.
Category：Application industries, powder Coating | Brand：MT
Introduction
Epoxy anticorrosion powder coating for reinforcing steel bars is a thermosetting heavy-duty epoxy system developed for epoxy-coated rebar. Built from two-step special epoxy resin, partial functional epoxy and designed anticorrosion curing agents, it delivers high reactivity, strong adhesion, toughness and bendability, plus resistance to chemicals, solvents, cathodic disbondment and impact.
Product Features
- Strong bond strength to the steel substrate.
- Dense, continuous, smooth film with high penetration resistance and few defects.
- Good baking heat resistance and high electrical insulation.
- Strong film-to-concrete bond, giving excellent gripping force.
- Tough — bends without cracking.
- Low melting temperature, high reactivity and cure completion, good mechanicals.
- Versatile, low powder consumption, reduces wire-drawing during rebar spraying.
Powder Coating Performance
| Item | Requirement | Method |
|---|---|---|
| Appearance | Uniform colour, no agglomeration | Visual |
| Colour | To customer requirement | — |
| Density (g/cm³) | 1.2–1.5 | GB/T 4472 |
| Average particle size | 30–50 μm | Laser scattering |
| Particle size distribution | Residue on 150 μm sieve ≤3.0%; on 250 μm sieve ≤0.2% | GB/T 6554 |
| Volatile content (%) | ≤ 0.6 | GB/T 6554 |
| Magnetic material (%) | < 0.002 | GB/T 2428-86 |
| Gel time | ≤ 20 s at 200°C | GB/T 6554 |
| Curing time | ≤ 60 s at 230°C | GB/T 6554 |
Cured Film Performance
| No. | Test item | Requirement | Method |
|---|---|---|---|
| 1 | Appearance | Smooth, continuous; no bubbles, cracks or pinholes | Visual |
| 2 | Cathodic disbondment | ≤ 2 mm | GB/T 25826-2010 |
| 3 | Continuity | No holes, voids, cracks or visible defects | GB/T 25826-2010 |
| 4 | Bendability (40 mm mandrel) | No visible cracks, fractures or peeling | GB/T 25826-2010 |
| 5 | Bond strength | Coated rebar bond ≥ 85% of uncoated rebar | GB 50152 |
| 6 | Impact strength | No coating fragmentation | GB/T 25826-2010 |
| 7 | Chloride ion penetration | < 1×10⁻⁴ M | GB/T 25826-2010 |
| 8 | Chemical corrosion resistance | No softening, blistering; good adhesion; no pinholes or pits | GB/T 25826-2010 |
| 9 | Abrasion resistance | ≤ 100 mg | GB/T 1768-1979 |
| 10 | Salt spray (800 h) | ≤ 3 mm | GB/T 25826-2010 |
Applicable standards: JG 3042-1997; GB/T 25826-2010.
Process & Storage
- Surface preparation: fully remove mill scale to bare metal; Sa2½ (GB/T 8923), anchor profile 50–70 μm; surface free of chlorides and contaminants. Preheat 220–245°C. Applied by electrostatic spraying.
- Storage: indoors, ventilated and dry, below 27°C, away from heat, corrosives and solvents; out of direct sun; stack no more than 4 layers; keep sealed.
- Shelf life: high reactivity means a recommended 3-month storage at 27°C; retest performance before using beyond this period.
Application Areas
Corrosion protection of reinforced-steel structures in bridges, ports, airports, buildings, basements, high-speed rail and other infrastructure.
Inquiry
We'll reply within 24 hours
