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Energy Storage Cabinets

Corrosion, weathering and cabinet appearance for indoor-outdoor use

Energy storage cabinets include outdoor energy-storage containers and battery-cabinet housings. Long-term outdoor placement exposes them to temperature changes, rain and salt corrosion, requiring comprehensive corrosion protection and weatherability.

Veri Coating offers smooth pure epoxy and heavy-duty pure epoxy powder coatings suitable for C4-C5 corrosion-protection systems, together with high-durable polyester-HAA and standard- or high-durable polyester-TGIC textured powders featuring strong adhesion and more than 1,000 hours of salt-spray resistance. TGIC textured grades offer a greater cost advantage.

Application notes: Welds and edges require complete coverage, and intercoat curing should be controlled according to the selected coating system.

Typical Powder Coating Challenges for Energy Storage Cabinets

Edges and WeldsLow film build at welds and formed edges allows corrosion to start at weak points.

Edges and Welds

Energy-storage cabinet doors, formed edges, welds and lap joints are susceptible to the Faraday cage effect, pull-away from sharp edges and discontinuous pretreatment coverage, so their film build is usually lower than on broad flat areas. Under outdoor damp-heat or salt-spray exposure, corrosion often starts at these weak points and spreads along welds and edges.

Formulation Design

  1. Use an epoxy powder primer with strong edge coverage and corrosion resistance, combined where necessary with a weatherable polyester topcoat.
  2. Optimise melt viscosity, wetting and reactivity to reduce pull-away from sharp edges and improve continuous weld coverage.

Process Control

  1. Remove slag, spatter and mill scale from welds, and round sharp edges before applying a stable pretreatment.
  2. Coat welds, inside corners and formed edges before broad flat areas; reduce local voltage and provide a touch-up pass.
  3. Control effective film thickness at the thinnest location and confirm full cure from actual part temperature.
Validation Focus
  • Minimum film thickness at edges
  • Continuous weld coverage
  • Corrosion creepage from a scribe
  • Adhesion after damp heat
Powder-Coating Compatibility with Galvanized SubstratesInadequate galvanized-surface preparation or outgassing control causes blistering, peeling and adhesion loss.

Powder-Coating Compatibility with Galvanized Substrates

Passivation films, oil, white rust and zinc-layer porosity on galvanized sheet can impair powder wetting and adhesion. During cure, gas released from the zinc layer or substrate can also cause pinholes, blisters and local delamination. Failure after damp heat becomes more pronounced when pretreatment and powder coating are incompatible.

Formulation Design

  1. Select a polyester system or epoxy powder primer with good wetting and adhesion on galvanized substrates, while preventing premature surface closure.
  2. For galvanized parts prone to outgassing, use an outgassing-tolerant design that balances the melt-flow window and corrosion resistance.

Process Control

  1. Confirm the galvanizing type, passivation condition and surface cleanliness, removing white rust, oil and incompatible passivation layers.
  2. Use a validated zirconium, silane or other compatible pretreatment, with controlled rinsing and drying.
  3. Preheat for outgassing where necessary, and validate preheat temperature, film thickness and cure profile on actual parts.
Validation Focus
  • Cross-hatch adhesion
  • Adhesion after damp heat
  • Pinholes/blisters
  • Salt spray and scribe corrosion