Ultra Corrosion Resistant Pure Nickel Strip for 18650 Battery Packs

Corrosion is the silent killer of battery packs. A tab that looks perfect at assembly can lose its passivation film after months of salt-laden air, electrolyte vapour or condensation cycling — the weld line rusts first, contact resistance climbs, and pack impedance drifts outside spec. The remedy is not a thicker coating; it is a base metal that does not need one. This high-purity nickel strip (N6/Ni201/Ni200/N4) carries a stable, self-healing passive film, slit to battery-grade tolerances and verified per coil, so 18650 packs keep their impedance stable through temperature and humidity cycling.

• ≥99.5% nickel purity (N6) — impurity-driven micro-galvanic corrosion sites minimized at grain boundaries.
• Self-healing passive film — the base metal re-passivates after scratches, unlike plated coatings that delaminate.
• Ni201 low-carbon option (C ≤0.02%) — welded joints stay corrosion-resistant; no carbide sensitization at 425–760 °C.
• ASTM B117 salt-spray tested batches — corrosion performance verified on production lots, not just certificates.
• 0.5 kg free sample & 5 kg MOQ, 3–7 day ship — validate corrosion behaviour on your own pack line before volume.

Corrosion in nickel starts where impurities (Fe, Cu, Mn) segregate at grain boundaries, forming micro-galvanic cells that become pitting initiation sites. Higher base purity means fewer defect sites and a more uniform passive film.

For battery tabs exposed to electrolyte or humid cycling, N6 and Ni201 give the reliability of a corrosion-resistant base metal at a predictable cost.

Corrosion resistance lives at the surface. Annealed bright strip forms a uniform oxide film that re-passivates quickly; cold-rolled strip can be supplied cleaned or passivated for corrosive duty.

FOB China port, subject to coil size and quantity. Final quotation per drawing.

Source: DLX product catalogue, pure nickel family (grades N4 / N6 / Ni200 / Ni201).

Corrosion claims are verified, not assumed. Production batches are sampled for ASTM B117 salt-spray performance alongside tensile, hardness and slit-edge burr checks; every coil passes thickness gauging across the width. Chemical composition is locked per heat, and an EN 10204 3.1 MTC is issued on request.

Coils are wrapped in anti-rust paper with a moisture barrier, secured on plywood pallets and strapped for sea or air freight; coil IDs and lot numbers give full traceability back to the heat. Standard sizes ship in 3–7 days from stock, custom slitting in 15–25 days. Free 0.5 kg samples are dispatched within 3–5 days.

Since 2002, Changzhou DLX Alloy has shipped nickel-alloy strip to battery, chemical and instrumentation customers around the world. Every coil leaves the 12,000 m² nickel-only plant with a lot number that traces back to its heat — composition, rolling schedule and test records in one file. That traceability is what lets pack makers audit our corrosion and dimensional data as easily as they audit their own production, backed by ISO9001 and SGS certification and 1,200 tonnes of annual capacity.

Plated steel protects only while the coating is intact — cut edges and weld zones expose the steel core, which corrodes and raises contact resistance. Pure nickel is corrosion-resistant through the full cross-section and its passive film re-forms after surface damage.

Welded tabs in alkaline electrolyte service: Ni201 (C ≤0.02%) to keep the weld zone passive. General corrosion or humid cycling without heavy electrolyte: N6 offers the same purity class at lower cost.

Production batches are sampled for ASTM B117 salt-spray performance, and an EN 10204 3.1 MTC with test results is issued on request.

MOQ is 5 kg. A free 0.5 kg sample is available for N6 and Ni200; N4 and Ni201 samples are charged and refunded with your first order above 50 kg.

Yes — send your width, pitch and forming drawing. We supply slit widths, temper and surface finish (including passivation) to match your tab press, with samples for validation before volume.