Rivers C5-H Two-Coat Heavy-Duty Anti-Corrosion Powder Coating

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Product Overview

Rivers C5-H Two-Coat Heavy-Duty Anti-Corrosion Powder Coating System is designed for long-term protection of steel substrates exposed to very high-corrosivity atmospheric environments. The system uses a two-coat design consisting of “EX-P Pure Epoxy Heavy-Duty Anti-Corrosion Primer + CJ Outdoor Super Durable Polyester Topcoat”. Through the synergistic effect of primer barrier corrosion protection and topcoat weathering resistance, it enhances the overall durability of the coating system in high-salt-spray, high-humidity, coastal and industrial corrosive environments.

This system focuses on the protection requirements of corrosion-prone areas such as edges, weld seams, holes, connection points and complex structural parts. Film thickness, pretreatment grade and cyclic ageing validation programs may be configured according to project-level requirements.

Recommended Applications:

· Steel structures, steel components and outdoor infrastructure in coastal and port areas

· Standard and special containers, energy-storage containers and nearshore equipment enclosures

· Heavy-duty anti-corrosion outdoor electrical cabinets, equipment housings and industrial enclosures

· Carbon-steel components exposed to high humidity, high salinity, industrial atmospheres or long maintenance-cycle requirements

· Projects with high requirements for edge coverage, intercoat adhesion and long-term anti-corrosion performance

Key Features

· Uses a pure epoxy anti-corrosion primer with high crosslink density and barrier-protection design, suitable for carbon-steel anti-corrosion systems.

· The two-coat structure combines primer-level corrosion barrier protection with outdoor weather resistance from the topcoat, making it suitable for C5-H target environments.

· Enhanced protection is provided for edges, weld seams, holes and connection areas, reducing the risk of corrosion spreading from weak points.

· Suitable for electrostatic spray application; the application window, reclaimed powder blending and curing conditions may refer to the corresponding product TDS.

· Neutral salt spray, condensation, cyclic ageing and scribe corrosion evaluations can be conducted according to project requirements.

Typical Performance Indicators and Validation Recommendations

Item	Test Standard	Recommended / Typical Target
Dry Adhesion	ISO 2409 / ASTM D3359	Grade 0–1 / 4B–5B; grade 0 is recommended as the target for the two-coat system
Intercoat Adhesion	ISO 2409 / Internal Method	Pass; focus on verifying the effect of primer curing window and topcoat application interval
Impact Resistance	ISO 6272 / ASTM D2794	Pass; depends on system design, total film thickness and substrate thickness
Bend Resistance	ISO 1519 / ASTM D522	Pass; depends on total film thickness and deformation requirements of the structural component
Condensation Test	ISO 6270-1	720 h, or according to project specification
Neutral Salt Spray (NSS)	ISO 9227	1440 h or above may be used as a project reference; final requirements should be based on project specification and sample validation
Cyclic Ageing Test	ISO 12944-6 / ISO 12944-9 reference	1680 h, or set according to C5-H project requirements
Scribe Corrosion Evaluation	ISO 4628 / ISO 12944-6	Evaluate corrosion creep, blistering, adhesion and panel rust grade according to project requirements

Note: Laboratory TDS data for EX-P used with an outdoor weather-resistant topcoat show that, under the conditions of low-carbon steel with silane pretreatment, 100 μm primer and 80 μm topcoat, after 1500 h neutral salt spray exposure, the rest of the panel surface may maintain Ri 0, with no blistering and adhesion grade 0. For C5-H projects, it is recommended to prepare new samples and validate the system under the actual pretreatment, film thickness and component conditions.