Epoxy Anti-Corrosion Powder Coating for Reinforcing Steel

Surface Finish Options Overview

Product Introduction:
This product is a thermosetting epoxy-modified heavy-duty anti-corrosion powder coating specifically designed for reinforcing steel. The formulation uses partially imported functional epoxy resins and dedicated anti-corrosion curing agents. It features excellent reactivity, strong adhesion, good flexibility, and bendability, as well as superior resistance to chemicals, solvents, cathodic disbondment, and impact.

 

Product Usage:
Widely used for corrosion protection of reinforcing steel in bridges, ports, airports, buildings, basements, high-speed railways, and other infrastructure projects.

 

Product Features:

Excellent adhesion to the substrate.Dense, continuous, bright coating with low permeability and minimal pinholes.Superior cathodic disbondment resistance and high electrical insulation.High bond strength with concrete.Good flexibility, does not crack when bent.Low melting temperature, high reactivity, high curing completion rate, and good mechanical properties.Versatile and low powder consumption.Reduces or eliminates stringing during the powder coating process.

 

Powder Performance:

Property	Specification	Notes
Adhesion	Excellent
Coating Density	Dense, continuous, bright
Cathodic Disbondment Resistance	Superior
Electrical Insulation	High
Bond Strength with Concrete	High
Flexibility	Good, does not crack when bent
Temperature Resistance	Low melting temperature, high reactivity
Mechanical Properties	Good

 

Curing Conditions:

Property	Specification	Notes
Temperature	210-250°C for 3-1.5 minutes	Deviations may affect performance

 

Application Parameters:

Parameter	Specification	Notes
Applicable Equipment	Frictional charging spray, corona electrostatic spray, dip coating
Film Thickness	120-250um	Adjustable according to workpiece requirements

 

Health and Safety:

Property	Specification	Notes
Toxicity	Non-toxic
Flammability	Non-flammable
Regulation	GB15607-1995	Coating operation safety regulations

 

Precautions:

Item	Specification	Notes
Outdoor Use	Not recommended	May cause fading and chalking
Surface Preparation	Clean oxide scale, reveal metal color, surface roughness 50-70um, rust removal grade Sa21/2, no chloride residues
Preheating	Temperature controlled between 220-245°C
Storage	Ventilated, dry, below 27°C, away from heat sources, corrosive chemicals, and solvents, avoid strong light, maximum stack height 5 layers, avoid long-term pressure, keep packaging sealed
Storage Period	Best within 3 months at 27°C, validate performance if used beyond this period

 

Compliance Standards:
JC3042-1997 “Epoxy Coated Reinforcing Steel”;
GB/T25826-2010 “Epoxy Coated Reinforcing Steel for Concrete Structures”

FAQ

1. What is Powder Coating?

Powder coating is a dry finishing process used to apply a protective and decorative coating on metal or other surfaces. Instead of using liquid paint, fine powder particles (usually made of polyester, epoxy, or hybrid resins) are electrostatically charged and sprayed onto a conductive surface. The coated object is then baked in an oven, where the powder melts, flows, and cures into a smooth, durable finish.

Key features:

Durable, hard finish

Resistant to scratches, corrosion, and UV

Environmentally friendly (no VOCs)

2. Benefits of Powder Coating

Powder coating offers several advantages over traditional liquid painting:

Durability: Resistant to chipping, scratching, fading, and wear.

Corrosion Protection: Provides excellent protection against rust and chemicals.

Environmentally Friendly: No volatile organic compounds (VOCs) and minimal waste.

Efficiency: Overspray can be collected and reused, up to 99% material utilization.

Uniform Finish: Smooth, even coating without runs or drips.

Cost-Effective: Single-coat systems can achieve high film thickness, reducing labor and energy.

Aesthetic Variety: Wide range of colors, textures, and effects.

3. What Temperature to Cure Powder Coating

The curing temperature depends on the type of powder used:

Epoxy powder: ~160–200°C (320–392°F)

Polyester powder: ~180–210°C (356–410°F)

Hybrid (Epoxy-Polyester) powder: ~180–200°C (356–392°F)

Typical curing time: 10–20 minutes depending on thickness and oven type.

Always follow the powder manufacturer’s specifications for best results.

4. Process for Powder Coating

The powder coating process usually follows these steps:

Surface Preparation:

Clean the surface thoroughly (remove oil, grease, rust, or dirt)

Methods: chemical cleaning, sandblasting, or phosphating

Pre-Treatment:

Apply a conversion coating or primer if needed to improve adhesion

Powder Application:

Spray the powder using an electrostatic spray gun or fluidized bed

Curing:

Bake the coated object in an oven at the recommended temperature for the powder type

The powder melts and forms a continuous, smooth film

Cooling & Inspection:

Let the coated item cool

Inspect for defects, uniform coverage, and desired thickness

5. How to Spray Powder Coat

Equipment Needed:

Electrostatic spray gun

Compressed air supply

Powder feed hopper or container

Grounding of the object

Steps:

Ground the object: Ensures the charged powder is attracted to the surface.

Spray evenly: Hold the gun 6–12 inches from the surface, moving in smooth, overlapping strokes.

Apply sufficient powder: Ensure full coverage without excessive buildup.

Cure immediately: Transfer the sprayed item to the curing oven to fuse the powder into a solid coating.

Tips:

Maintain consistent speed and distance while spraying.

Use proper ventilation to reduce airborne powder accumulation.

Test a small area to check film thickness and color before full application.