Below the Waterline: Immersion-Grade Protection

Below the waterline, steel is exposed to constant moisture and aggressive marine conditions that accelerate corrosion. To address these challenges, the barge’s hull was coated with a system of Series N69F and Series 142, both engineered for severe immersion service.

Series N69F is a high-solids, high-build epoxy that forms a dense, low-permeability barrier. Its ability to build film thickness efficiently helps limit water penetration while providing excellent adhesion and abrasion resistance—key attributes for marine hull applications.

Applied in combination, Series 142 enhances the system’s durability and chemical resistance, delivering proven performance in long-term immersion environments. Together, these coatings create a robust protective system designed to withstand continuous exposure while extending service life below the waterline.

Above the Waterline: Zinc-Rich Corrosion Control and Finish Durability

Above the waterline, marine steel faces a different set of challenges, including salt-laden air, humidity, UV exposure, and temperature cycling. For these conditions, the topside coating system was designed from the steel outward, beginning with a zinc-rich primer.

Series 90G, a zinc-rich epoxy primer reinforced with graphite, provides critical cathodic (sacrificial) protection. In marine environments, zinc plays a vital role by protecting steel even when the coating system is damaged. If exposed, the zinc corrodes preferentially, helping prevent rust from forming on the substrate. This added level of protection is especially important in coastal and industrial port settings where corrosion risks are high.

Above the zinc-rich primer, Series N69F was used to add barrier protection and system toughness. Its high-build epoxy formulation contributes to overall durability while helping protect the zinc layer beneath.

The system was finished with Series 1090, an aliphatic polyurethane selected for its excellent color and gloss retention. Applied in a bright red finish, Series 1090 delivers long-term resistance to UV degradation and weathering while maintaining a clean, high-visibility appearance in marine service.

A Complete System Designed for Marine Service

This Axial liquid chlorine barge demonstrates how a properly designed coating system can address the distinct demands of both immersion and atmospheric exposure. By combining immersion-grade epoxies below the waterline with zinc-rich corrosion protection and a durable polyurethane finish above it, Tnemec delivered a comprehensive marine coating solution built for performance, longevity, and appearance.

From the hull to the topside, this project reflects Tnemec’s commitment to coating systems that protect critical assets in some of the most demanding environments.